LASER (LAS) FILE FORMAT EXCHANGE ACTIVITIES

What is the LAS Format?

The LAS file format is a public file format for the interchange of 3-dimensional point cloud data data between data users. Although developed primarily for exchange of lidar point cloud data this format supports the exchange of any 3-dimensional x,y,z tuplet. This binary file format is a alternative to proprietary systems or a generic ASCII file interchange system used by many companies. The problem with proprietary systems is obvious in that data cannot be easily taken from one system to another. There are two major problems with the ASCII file interchange. The first problem is performance because the reading and interpretation of ASCII elevation data can be very slow and the file size can be extremely large even for small amounts of data. The second problem is that all information specific to the lidar data is lost. The LAS file format is a binary file format that maintains information specific to the lidar nature of the data while not being overly complex. 继续阅读“LASER (LAS) FILE FORMAT EXCHANGE ACTIVITIES”

10 Must Consider Solutions for Working With LiDAR in GIS or UAV Mapping Projects

We all are well aware of LiDAR and the benefits of LiDAR, if not then spend some time searching out how organizations are turning to LiDAR for high precision 3D and aerial mapping projects. There’s LiDAR centric industry magazines out there (See LiDAR Magazine for example), LiDAR discussion groups, facebook pages, meetups and much more. Mapping companies small and large are all looking at the technology as a solution for creating amazing 3D data products or for simply filling in the gaps in their maps, webmaps, and apps. We explore some options for professionals interested in LiDAR by sharing 10 Software solutions that you might want to consider to help managing, analyzing, and working with LiDAR.

LiDAR dataset of a section of highway (Source: Safe Software)
LiDAR dataset of a section of highway (Image Credit: Safe Software)
  1. Rapidlasso LAStools  – LAStools is a collection of highly-efficient, scriptable tools with multi-core batching that process LAS, compressed LAZ, Terrasolid BIN, ESRI Shapefiles, and ASCII.  this product suite is used  heavily used in the commercial sector, government agencies, research labs, and educational institutions alike for filtering, tiling, rasterizing, triangulating, converting, clipping, quality-checking, etc… The company also an has open-source LiDAR compressor tool (award winning) called LASzip for those with a need for compressed LiDAR.
  2. LiDAR Compressor  – The company has a number of fine solutions that will help the LiDAR user be much more productive including their LiDAR Compressor Tool which enables users to reduce LiDAR file sizes by 75 percent or more while retaining all of your points and all of the precision and accuracy of your point data.  Also from Lizardtech is their GeoGofer Solution to help locate your LiDAR data.
  3. LiMo – LiDAR Mobile App – Developed by OGSystems, this is a LiDAR viewing app for android and iOS. The app is available for free on the Google play store and apple iTunes app store. With the app, users can not only view but also manipulate either their own point clouds or download existing data provided by OGSystems servers.
  4. Global Mapper LiDAR Module – This solution offers the ability to quickly identify and classify building and vegetation points in unclassified LiDAR data, a new tool to automate the feature extraction process for creating 3D vector buildings and trees, and dramatically improved automatic classification of ground points. The LiDAR Module offers an array of post-processing tools that enable the querying, filtering, editing, reclassifying, and exporting of LiDAR data.
  5. TerraSolid for processing LiDAR data – Terrasolid develops software products that are used for processing LiDAR and image data from airborne and mobile laser scanning systems. TerraSolid products are able to use the pointclouds in a geospatial settingTerrasolid develops software products that are used world-wide for processing point cloud and image data from airborne and mobile systems.
  6. LiDAR in ArcGIS – ArcGIS offers many tools for managing lidar point clouds and deriving useful products from them to aid scientific research and decision making. Learn more about Working natively with Lidar data with Esri solutions. Esri has also authored a paper in their ArcNews publication titled 5 Ways to Use Lidar More Efficiently
  7. RiALITY on iPad from Riegl – This app  allows users to experience LiDAR data in a completely new environment. It also allows easier LiDAR data demonstrations through the use of an iPad. RiALITY features true color point clouds and 3D navigation. In a breakthrough technological development, the app features an Augmented Reality Mode. The Augmented Reality Mode allows point clouds to be virtually projected into the real world.
  8. LP360 – This solution turns ArcMap Basic edition into the world’s most powerful GIS environment for LIDAR point cloud processing. Whether from airborne LIDAR or drone collected imagery, 3D point clouds have become a critical base mapping layer. LP360 provides tools from rapid visualization and derived product generation through advanced features such as automatic ground classification and building footprint extraction.
  9. Certainty 3D – Software for working with and extracting featured from LiDAR data. Solutions include TopoDot for point cloud data processing, TopoLift to support your laser scanning, and TopoPlanner & TopoMission, free apps to help plan, estimate and manage your scanning projects. Their products address the challenges of data management, quality assessment and extraction of 3D CAD models from LiDAR data.
  10. Merrick MARS – The Merrick Advanced Remote Sensing (MARS®) software suite is a comprehensive, production-grade Windows application designed to visualize, manage, process and analyze LiDAR point cloud data. The MARS suite includes MARS FreeView (basic LiDAR visualization), MARS Explorer (LiDAR data classification and processing), MARS Explorer QC (automated feature processing), and MARS Production for advanced processing and more.
  11.  BONUS — Safe Software, FME  has a number of built in functionality that enables users to process and analyze raster data products. FME can support the transformation of point cloud data into over 300 data formats! Note, Dale Lutz of Safe addressed the topic of LiDAR  in a blog post that discussed how Esri was knocking down the barriers to working with LiDAR data via their native support for LAS within ArcGIS at R 10.1.

继续阅读“10 Must Consider Solutions for Working With LiDAR in GIS or UAV Mapping Projects”

10 Top Lidar Sensors For UAVs

Lidar sensors on UAVs capture imagery which only a few years back needed an aircraft, large heavy lidar sensors and a crew to accomplish. Along with lidar sensors mounted on UAVs, sophisticated software can process the lidar images very quickly so effective decisions can be made by stakeholders and relevant parties.

The drone lidar sector is  growing rapidly and especially over the past 2 years. In only a short period of time, manufacturers of best aircraft lidar sensors have engineered lidar sensors for small drones.

The output from these UAV lidar sensors is outstanding and will keep improving as more manufacturers enter this sector. Over the coming years, we are going to see most of the lidar sensor work moving from aircraft to UAVs.

In this post we look at 10 of the best lidar sensors for small unmanned aerial vehicles. These lidar sensor manufacturers are Velodyne, Routescene, Leddartech, Riegl, YellowScan and  Geodetics.  We also discuss some of the many great uses of lidar technology and how each lidar sensor works well in different sectors such as  mining, forestry, surveying, corridor mapping etc.

About Lidar Sensor Technology

Lidar – Light Detection and Ranging or Lidar is a remote sensing technology where the environment is usually scanned with a pulsed laser beam and the reflection time of the signal from the object back to the detector is measured.

The Time-of-Flight (TOF) reflection time measurement can be used over distances from one meter up to several kilometers. To increase the range of lidar systems, very short laser pulses in the invisible Near Infrared range are used. These enable a far higher laser power compared to continuous wave lasers while still complying with eye safety requirements.

During the scanning process, the lidar system will gather individual distance points within an aggregate of points, from which 3D images of the environment can be computed. The laser scanners deflect the laser beam using deflecting mirrors, which enables them to achieve very wide fields of vision (FOV).

Most of the latest UAV lidar systems can rotate around their own axis and offer 360 degree visibility. Modern devices achieve very high data rates with over one million distance points per second.

How Lidar Sensors Works In Brief

  1. Emission of a laser pulse
  2. Record of the back scattered signal
  3. Distance measurement (Time of flight x speed of light)
  4. Retrieving plane position and altitude
  5. Computation of precise echo position

UAV Lidar Sensor Uses

Lidar Sensors For Drone Collision Avoidance

Within a lidar sensor, a number of independent elements are integrated into a single device and will generate critical ranging data for safe navigation along with precise positioning. Lidar technology has obstacle detection capabilities over a wide field of view making it a top performer as part of a sense and avoid solution.  Lidar is the leading technology for automobile collision avoidance and also in driver-less cars.

Collision avoidance technology has now moved across into the consumer drone sector with the highly innovative DJI Phantom 4 Pro (using 2 Ultrasound sensors  and 4 monocular sensors) and the Yuneec Typhoon H Pro (uses the Intel RealSense R200 3D camera) now with collision avoidance.

Lidar Sensors For Ground And Above Ground Imagery

The latest lidar sensors have integrated optical altimeter technology which deliver accurate distance measurements above ground level while meeting size, weight, and cost requirements of UAV manufacturers.

Agriculture and forestry use lidar to inspect vegetation such as leaves and crops. Also, the above ground imagery (for example forest canopy) can be removed to view the ground surface area.

Lidar Drones For Structural Inspection

The best lidar sensors  have powerful built-in signal processing, large field of view, and multi-segment measurements which generate critical distance data and efficient obstacle detection which enable safe navigation when performing structural inspections.

Lidar Sensors In The Night

Lidar sensors also described as laser scanning will work in low contrast or shadowy situations, even at night.

Lidar UAV Uses In Brief  

  • Agriculture & forestry
  • Archaeology and cultural heritage documentation
  • Corridor mapping: power line, railway track, and pipeline inspection
  • Topography in open-cast mining
  • Construction site monitoring
  • Building and structural inspections
  • Surveying of urban environments
  • Resource management
  • Collision avoidance
  • Shoreline and storm surge modeling
  • Hydrodynamic modeling
  • Digital Elevation Models

Multispectral and Photogrammetry Imagery

Lidar, multispectral and photogrammetry imagery are all very closely related technologies.  In some sectors and situations, images from all 3 are required to give a full analysis of the terrain, vegetation or structure.  To read further on these technologies see the following articles:

UAVs In The Lidar Applications Sector Increases Substantially

Introduction To UAV Photogrammetry And Lidar Mapping Basics

Multispectral Imaging Drones In Farming Yield Big Benefits

Multispectral Remote Sensing Drones For Golf Course Vitality

ToF 3D Cameras (Flash Lidar)

Now, sometimes you might hear people talk about Flash Lidar.  Time-of-Flight cameras sensors are often referred to as Flash Lidar. But there are big differences in the technology and it’s uses.

ToF is scannerless, meaning that the entire scene is captured with a single light pulse, as opposed to point-by-point with a rotating laser beam.

Time-of-flight cameras capture a whole scene in three dimensions with a dedicated image sensor, and therefore has no need for moving parts.  ToF has so many great uses.  Here is a terrific article giving you all the information on ToF cameras and best uses.

10 Top Lidar Sensors For UAVs

Lidar Sensor Images From UAV of Power Lines And Forest CanopyThe below lidar sensors were designed and engineered for small UAVs. Use the web links to each lidar sensor for more information.  Each manufacturer has excellent websites giving you full data sheets along with the best uses for their lidar sensors.

LeddarTech – Vu8 Lidar Sensor

The LeddarTech Vu8 is a compact solid-state lidar which provides highly accurate multi-target detection over eight independent segments. Detecting targets at up to a 215 meter range and weighting only 75 grams, the Vu8 delivers nearly twice the range for half the volume compared with the Leddar M16 from which it inspires.

The Vu8 uses a fixed laser light source, which significantly increases the sensor’s robustness and cost-efficiency. The Vu8 has a high tolerance to noise and interference.  This means it is unaffected by other sensors’ signal, by lighting conditions including direct sunlight, and it provides reliable detection in various weather conditions including rain and snow.

The Vu8 sensor is particularly suited for navigation and collision avoidance applications in driver-assisted, semi-autonomous and autonomous vehicles, such as drones, trucks, heavy equipment for construction and mining, shuttles, buses and other public transportation vehicles.

Applications such as Advanced Traffic Management System (ATMS) requiring longer ranges as well as wide fields of view will also benefit greatly from the new Vu8 sensor.

Features and Benefits of the Vu8 Lidar Sensor

  • Detection range up to 215 m (≈ 700 ft)
  • Compact and lightweight (≈ 75 g)
  • 8 independent segments with simultaneous acquisition and lateral discrimination capabilities
  • 20°, 48° and 100° beam width options, for optimized field of view
  • Rapid refresh rate up to 100 Hz
  • Immune to ambient light
  • No moving parts, for ultimate robustness
  • Easy to integrate, includes Leddar Enabler SDK
  • Based on the modular LeddarVu platform for flexible integration and customization
  • Best cost/performance ratio

Velodyne – 3 Of the Best Lidar Sensors For UAVs

Velodyne Lidar now provides a full line of sensors capable of delivering the most accurate real-time 3D data on the market. Their sensors are developed to create a full 360 degree field of vision environmental view for use in autonomous vehicles, industrial equipment, 3D mapping and surveillance. Velodyne have 3 lidar sensors for UAVs.

HDL-32E Lidar Sensor

The HDL-32E LiDAR sensor is small, lightweight, ruggedly built and features up to 32 lasers across a 40 degree vertical field of view. The HDL-32E measures only 5.7″ high x 3.4″ in diameter, weighs less than 2kg and was designed to exceed the demands of the most challenging real world autonomous navigation, 3D mobile mapping and other lidar applications.

  • Dual Returns
  • ± 2 cm accuracy
  • 1.3 kg with cabling (2.86 lbs)
  • 32 Channels
  • 80 – 100 meter range
  • 700,000 Points per Second
  • 360° Horizontal FOV
  • +10° to -30° Vertical FOV
  • Low Power Consumption
  • Rugged Design
  • Weighs less than 2 kg (4.4 lbs)

Puck VLP-16 Lidar Sensor

Velodyne’s new PUCK VLP-16 lidar sensor is the smallest, newest, and most advanced product in Velodyne’s 3D lidar product range. It is more cost-effective than similarly priced sensors and developed with mass production in mind. It retains the key features of Velodyne’s breakthroughs in lidar: Real-time, 360 degree horizontal FOV, 3D distance and calibrated reflectivity measurements.

  • Dual Returns
  • 830 grams
  • 16 channels
  • 100 meter range
  • 300,000 points per second
  • 360 degree Horizontal FOV
  • ± 15° vertical FOV
  • Low Power Consumption
  • Protective Design
  • Weight of 830 grams (1.82 lbs)

Velodyne Puck Lite Lidar Sensor For UAVs

Velodyne Puck VLP-16 Hi-Res Lidar Sensor For UASVelodyne LiDAR’s Puck LITE is a lighter weight version of the VLP-16 PUCK for applications that demand a lower weight to meet their requirements. The Puck LITE has identical performance to VLP-16 with the only difference in weight of 590 grams (1.3 lbs) versus 830 grams for the VLP-16.

No other changes have been made to the Puck LITE as it retains its patented 360 degree surround view to capture real-time 3D lidar data which includes distance and calibrated reflectivity measurements.

Here is a terrific video which explains how lidar is being used and what the Velodyne lidar sensors can do.

Riegl  – VUX-1UAV LiDAR Sensor

Laser scanning utilizing high-end unmanned airborne platforms provides the possibility to acquire data in dangerous and/or hard-to-reach areas, while offering an excellent cost-to-benefit-ratio for numerous applications, e.g., precision farming, forestry, and mining.

For years, Riegl Airborne Laser Scanners have been successfully used in powerful unmanned airborne platforms. With the VUX-1UAV airborne scanner and the RiCOPTER which is Riegls‘s remotely piloted aircraft system for Unmanned Laser Scanning (ULS), Riegl have revolutionized the commercial and civil market with its advanced systems.

The Riegl VUX-1UAV (former VUX-1) is a very lightweight and compact lidar laser scanner, meeting the challenges of emerging survey solutions by UAS/UAV/RPAS, both in measurement performance as in system integration.

With regard to the specific restrictions and flight characteristics of UAS, the Riegl VUX-1UAV is designed to be mounted in any orientation and even under limited weight and space conditions.

It is modest in power consumption with the instrument requiring only 1 power supply. The entire data set of an acquisition campaign is stored onto an internal 240 Gigabyte SSD and/or provided as real-time line scan data via the integrated LAN TCP / IP interface.

VUX-1UAV Lidar Sensor Main Features:

  • 10 mm survey grade accuracy
  • Scan speed up to 200 scans per second
  • Measurement rate up to 500,000 measurements per second
    (@ 550 kHz PRR & 330° FOV)
  • Operating flight altitude up to more than 1,000 feet
  • Field of view up to 330 degree for practically unrestricted data acquisition
  • Regular point pattern, perfectly parallel scan lines
  • Cutting edge Riegl technology providing
    – echo signal digitization
    – online waveform processing
    – multiple-time-around processing
  • Multiple target capability – practically unlimited number of targets echoes
  • Compact (227 x 180 x 125 mm), lightweight (3.5 kg) and rugged
  • Easily mountable on professional UAS / UAV / RPAS
  • Mechanical and electrical interface for IMU mounting
  • Electrical interfaces for GPS data string and Sync Pulse (1 PPS)
  • LAN-TCP/IP Interface
  • Scan data storage on internal 240 Gigabyte SSD Memory

VUX-1UAV Lidar Sensor Main Applications

  • Agriculture & forestry
  • Archaeology and cultural heritage documentation
  • Corridor Mapping: power line, railway track and pipeline inspection
  • Topography in Open-Cast Mining
  • Construction-site monitoring
  • Surveying of urban environments
  • Resource management

This next video shows the Riegl’s ready to fly UAV laser scanning system which is equipped with the survey grade VUX-1UAV lidar sensor.

Routescene – UAV LidarPod

Routescene LidarPod With Velodyne Sensor For DronesThe Routescene UAV LidarPod is a complete turnkey system developed specifically for use on UAVs.  This company worked with the surveying industry and it’s their expertise which is behind the Routescene UAV LidarPod.

Routescene designed a reliable, practical and cost-effective solution for lidar applications. The UAV LidarPod is a robustly engineered and self contained system. It is simple to operate and enables rapid deployment in the field. The turnkey solution includes LidarViewer which is the specialized software to handle the resulting data.

The LidarPod sensor combines the best technology on the market to capture survey grade positional accuracy together with a very high point cloud density.

Points Per Second

The Routescene LidarPod will collect 700,000 points per second, which at an altitude of 40 meters (131 feet) and flying speed of 30 km per hour (18.64 mph) equates to 300 points per square meter. This offers a fantastic richness in the dataset which greatly enhances the detail which can be collected.

LidarPod Is Very Light

The Routescene UAV LidarPod total weight is less than 2.5 kg (5.5 lbs). This low weight will enable a 20 minute flight duration, the typical time required to perform a survey, allowing coverage of 1 square km on a single set of batteries.

Quality And Level Of Resilience

The Routescene UAV LidarPod contains all you need to collect precise survey data, quality control the data in real-time and create a very dense and accurate georeferenced point cloud.  This means everything you need is built into the system including the lidar sensor, GPS / INS, radio telemetry, data storage and power management. No external components are necessary which eliminates the possibility of integration issues and loose connectors.

The internal firmware controls the sensors, parses the raw data and transmits data samples to the Routescene Ground Station; it also manages and monitors power consumption of the LidarPod.

The LidarPod uses the Velodyne HDL-32e lidar sensor mentioned above which delivers unsurpassed image resolution. Highlights of the Velodyne HDL-32e within the LidarPod;

  • 32 laser sensors / detector pairs
  • Class 1 eye safe
  • 905 nm wavelength
  • Time of flight distance measurement with intensity
  • 700,000 3D points per second
  • Maximum Range: 100 meters with range accuracy of < 20 mm
  • Field of View: 360 degree vertical and 41 degree horizontal
  • Angular resolution (vertical): 1.33 degrees
  • Shock: 500 m/sec2 amplitude, 11 msec duration
  • Environmental Protection: IP67

Processing Lidar Data

Routescene have developed specialized software called LidarViewer, which enables you to easily import, visualize, and apply filters to the large volume of data you collect in a smart way, enabling the use of GIS and CAD packages thereafter.

LidarPod GPS \ INS

A state of the art integrated Real-Time Kinematic (RTK) GPS and Inertial Navigation System (INS) provides accurate position, velocity, acceleration and orientation under the most demanding conditions. The dual antenna moving baseline Real Time Kinetmatic (RTK) GNSS solution ensures that the LidarPod can achieve the highest accuracy possible for the lowest weight.

The GPS\INS sensor combines temperature calibrated accelerometers, gyroscopes, magnetometers and a pressure sensor with a multi channel RTK GNSS receiver. These are coupled in a sophisticated fusion algorithm to deliver accurate and reliable navigation and orientation.

Triple-frequency GNSS receiver that provides up to 1 cm accuracy positioning and supports all of the current and future satellite navigation systems, including GPS, GLONASS, GALILEO (European Satellite Navigation System) and BeiDou (Chines Satellite Navigation System). It also supports the Omnistar service for hassle free high accuracy positioning.

UAV Mounting Kit (optional)

A specially designed and tested solution for mounting the LidarPod and 2 GPS antennas onto your rotary UAV. The mounting kit includes an equipment plate which is compatible with 12 mm diameter UAV equipment rails, the 2 rails being 160 mm apart. The equipment plate includes quick release clamps for easy deployment.

YellowScan – 2 UAV Lidar Sensors

YellowScan designs and develops ultra compact and lightweight lidar 3D laser mapping and aerial remote sensing solutions for drone deployment in industrial & scientific applications.

Benefit of YellowScan UAV Lidar Sensors

  • Scanning Vegetation & Crops: YellowScan’s technology is one of the few to get true distance to vegetation in near real-time. Scan fast growing vegetation  and crops as frequently as needed.
  • Optimized Maintenance Operations: Quick, light and easy to mobilize, the whole system (UAV+Lidar) can be carried in car trunk or airplane luggage: ideal for quickly surveying limited sections of the network which has not or can’t  been scanned with large airborne lidar (sections missed, hard-to-access areas, fast growing vegetation sections)
  • Security:  YellowScan UAV mapping allows for quick and complete acquisition while eliminating manned airborne or on the ground logistics.

The Yellow Scan Lidar Solutions are aimed towards;

  • Small areas (less than 10 square km  or 100km linear)
  • Need to penetrate vegetation
  • Hard-to-access zones
  • Data needed in near real-time / frequently / regularly
  • Accuracy range of 5-50 cm

YellowScan Mapper Drone Lidar Sensor

The YellowScan Mapper lidar sensor is a lightweight turn key surveying solution for drones and other ultra-light aircraft. It’s small size and ultra-light weight allow it to be mounted on most UAVs.

Yellow Scan Mapper Applications

Yellow Scan Mapper Lidar Sensor Benefits

  • Tested and operated by professionals world wide in various scenarios
  • Robust and reliable
  • Turn-key and simple to operate
  • Open architecture with interoperable software: fits many applications from research to industrial mapping
  • Fully autonomous and can be mounted quickly on any drone

Yellow Scan Mapper Specifications

  • Precision: 10 cm
  • Absolute accuracy: 15 cm
  • Laser scanner frequency: 40 kHz
  • Weight: 2.1 kg battery included
  • Power consumption: 10W
  • Autonomy: 2 hours typical
  • Size (mm): L172 x W206 x H147

YellowScan Mapper Lidar System Includes

  • High-end Attitude and Heading Reference System (AHRS) allowing precision measurement of the attitude
  • Dual-frequency GNSS receiver, capable of operating in RTK or PPK positioning mode
  • Multi-echo laser scanner
  • On-board computer for continuous data acquisition and processing
  • Battery (up to 2 hours of autonomy)
  • Worldwide technical and operational support

YellowScan Surveyor UAV Lidar Sensor

YellowScan Surveyor Lidar Sensor For DronesThe YellowScan Surveyor is one of the lightest and most accurate lidar sensor solutions for Civil Engineering & Mining professionals.  This YellowScan Lidar UAV surveying solution  has the highest level of accuracy and density which is also capable of producing real-time georeferenced point cloud data.

YellowScan Surveyor is a fully integrated system designed for the most demanding of terrains. The YellowScan Surveyor is quick and easily adapted to any drone.

Now, the YellowScan Surveyor does not replace the YellowScan Mapper mentioned above, but complements the YellowScan Mapper with a solution ideally suited for precise topography and demanding requirements for civil engineering and mining applications.

Yellow Scan Mapper Lidar Benefits

  • Designed by surveyors for surveyors
  • Robust and reliable
  • Turnkey, quick and simple to operate
  • Fully autonomous and can be quickly mounted on any drone
  • Subscale decimetric accuracy for highest density level data in demanding survey applications

YellowScan Mapper Lidar Specifications

  • Precision: 4cm
  • Absolute accuracy: 5cm
  • Laser scanner frequency: 300 kHz
  • Weight: 1.6 kg (3.5 lbs) battery included
  • Power consumption: 15W
  • Autonomy: 2 hours typical
  • Size (mm): 100 x 150 x 140

Leica Geosystems Lidar Sensors

Leica Geosystems are renowned for the Imaging and Lidar sensors.   Their Lidar systems offer high accuracy due to their best-in-class performance in pulse and scan rate.

While they have multispectral and imaging sensors which are mounted on UAVs, their Airborne lidar sensors are large and heavy.  Leica have 2 airborne lidar sensors which are too heavy for small UAVs.  Their large and heavy lidar sensors for manned aircraft are as follows;

Leica ALS80 Airborne Lidar Sensor: It’s a high performance airborne sensor for urban mapping and utility corridor surveys.  The weight of the ALS80 is 47kg (103 lbs) so it really is an aircraft lidar sensor.

Leica DragonEye Oblique Lidar Sensor: Industry leading 1 MHz airborne oblique lidar sensor.  The weight of the DragonEye lidar sensor head is 37 kg (81.5 lbs).  Again, this is also a lidar sensor for aircraft.

I would expect Leica to start designing small UAV lidar sensors in the near future. They have all the technology and this market is growing massively.

Geodetics – 2 Drone Lidar Sensors

Geodetics Geo-MMS SAASM Lidar Sensor For UASGeodetics was founded in 1999 by a team of scientists with the goal of providing precise positioning technologies in the civilian market.

Since that time, Geodetics has grown into a product and integrated solution provider for Positioning, Navigation and Timing systems for a wide range of civilian and defense applications.

Their products and systems have been deployed in mission critical applications including Aerial Refueling, Aerial Combat Training, Intelligence, Surveillance and Reconnaissance, UAV’s, Aerostats and Dismounted Soldier tracking.

Geo-MMS SAASM Drone Lidar Sensor

The Geodetics Geo-MMS SAASM is a fully integrated lidar mapping payload for integration with small unmanned vehicles. The Geo-MMS system includes an inertial navigation system, utilizing a SAASM GPS sensor with a path to M-Code, coupled with a lidar sensor.

Raw data from the integrated GPS, IMU and lidar sensors are recorded on the internal data recording device and can be post-processed using Geodetics’ lidar tool software package to directly geo-reference the lidar point clouds.

Geo-MMS SAASM Specifications

  • Flexible mounting for different platforms including UAV, UAS, ground vehicles and robots
  • Minimized sensor size and weight to meet payload restrictions (5 lbs minimum payload)
  • Available with a many IMU’s to support a wide range of application requirement
  • Centimeter-level position accuracy (dual-frequency RTK configuration)
  • On-board data logging of all sensor and navigation solution data
  • User interface to fully control individual and collective GPS, IMU, Laser setting
  • Full post-processing support for GPS/IMU/LiDAR with RTD-Post and CYO
  • LAS file output

Geo-MMS SAASM Lidar Applications

  • Intelligence, Surveillance and Reconnaissance (ISR)
  • Situational Awareness
  • Sense and avoid
  • Asset management
  • Coastal surveillance
  • Hydrometric mapping
  • Critical Oil & Gas infrastructure inspection
  • DEM/DSM generation
  • Indoor mapping capable (SLAM)

Geo-MMS Drone Lidar Mobile Mapping System

The Geodetics Geo-MMS is a fully integrated lidar mapping payload for integration with small unmanned vehicles. The Geo-MMS includes an inertial navigation system coupled with a lidar sensor. Raw data from the integrated GPS, IMU and lidar sensors are recorded on the internal data recording device.

They can then be post-processed using Geodetics’ lidar tool software package to directly geo-reference the Lidar point clouds with LAS format output. Geo-MMS is available with a wide range of sensors.

Geo-MMS Specifications

  • Flexible mounting for different platforms including UAV, UAS, ground vehicles and robots
  • Minimized sensor size and weight to meet payload restrictions (5 lbs minimum payload)
  • Available with a many IMU’s to support a wide range of application requirement
  • Centimeter-level position accuracy (dual-frequency RTK configuration)
  • On-board data logging of all raw and navigation solution data
  • User interface to fully control individual and collective GPS, IMU, Laser setting
  • Full post-processing support with GPS/IMU Geo-PostProcessing
  • LAS file output

Geo-MMS Lidar Applications

  • Intelligence, Surveillance and Reconnaissance (ISR)
  • Situational Awareness
  • Sense and avoid
  • Asset management
  • Coastal surveillance
  • Hydrometric mapping
  • Critical Oil & Gas infrastructure inspection
  • DEM/DSM generation
  • Indoor mapping capable (SLAM)

Here a quick overview of Geodetics products at the AUVSI’s Xponential 2016.

世界遥感机构大全

Europe
Agenzia Spaziale Italiana (ASI) – Italian Space Agency WWW server
Astrium is Europe’s leading space company.
Belgian Institute for Space Aeronomy
SPENVIS (SPace ENVironment Information System)
University of Bremen – Institute of Environmental Physics and Remote Sensing (IUP/ife)
GOME (The Global Ozone Monitoring Experiment)
SCIAMACHY (Scanning Imaging Absorption SpectroMeter for Atmospheric CHartographY)
Bristol University Centre for Remote Sensing
British National Space Centre (BNSC)
RSADU – Remote Sensing Applications Development Unit
Central Laboratory of the Research Councils (CLRC) – UK
BADC – British Atmospheric Data Centre
ATSR – Along Track Scanning Radiometer Project
Chalmers University of Technology – The Remote Sensing Group at the Departement of Radio and Space Science, Gothenburg, Sweden
CNES – Centre National d’Etudes Spatiales
University College London – Mullard Space Science Laboratory
University of Copenhagen – Institute of Geography
Chips (The Copenhagen Image Processing System)
Danish Center for Remote Sensing (DCRS) – Dept. of Electromagnetic Systems, Technical University of Denmark
DEFINIENS provides software solutions for intelligent information management in digital analysis of remote sensing imagery. – Munich, Germany.
Delft University of Technology – Photogrammetry and Remote Sensing
DLR Web Portal – German Aerospace Center (Deutsche Zentrum für Luft- und Raumfahrt)
Doxiadis GeoImaging S.A (DXGI) – Athens, Greece
EARS – Environmental Analysis & Remote Sensing Ltd – They are working in a multi-disciplinary environment, such as crop yield forecasting activities, energy and water balance monitoring, and forest monitoring – Delft, The Netherlands
Earth Observation Sciences, Ltd (EOS) – Specialists in the science, technology and application of Earth observation and environmental data management – Surrey, UK
Earth Oriented Science Division at Space Research Organization Netherlands (SRON)
Ecole des Mines de Paris, Remote Sensing and Modeling at Center for Energy Studies
Ecole Nationale du Génie Rural des Eaux et des Forêts (French Institute of Forestry, Agricultural and Environmental Engineering), Le Laboratoire Commun de Télédétection (LCT)
Electromagnetic Waves Research Institute – “Nello Carrara”, Firenze, Italy
Envia Oy – Environmental applications, weather stations, satellite imagery, geomatics. Finland
ERA-Maptec – Ireland
ESA – European Space Agency
earthnet online
Earth Observation Programme
EDMS Home Page – ESA Official Documents Management Service (EMITS, DODIS, ESALEX)
Announcements of Opportunity (AO) Web Site
ESSC Home Page – Environmental Systems Science Centre at The University of Reading, England
EUMETSAT – Europe’s Meteorological Satellite Organisation
EUMITS – EUMETSAT Invitation To Tender System 继续阅读“世界遥感机构大全”

2017咨询工程师完整参考答案

2017注册咨询工程师《政策与规划》完整参考答案(仅供参考):

1-5:DDCCC

6-10:BDABC

11-15:ABDAC

16-20:CBCBD

21-25:AACAB

26-30:BDBDA

31-35:ACCAB

36-40:ADACB

41-50:ADCCC

51-55:ABBBA

56-60:BCBAB

61-70:ABD ABCD ABCD BCDE ABCD    BCE BE BCDE ABC ABDE

71-80:CD ABE ABE ACDE ABCD   CD ABC CDE ACD ABC

81-90:ABC AE ABCE ABC ABC ABCE ABCE ABC ACDE BCD

91-95:ABCD ABCE CDE BCDE ACDE

 

arcgis10.5全套下载

arcgis10.5全套下载包括以下软件:

ArcGIS_Coordinate_Systems_Data_Windows_105_154002

ArcGIS_Data_Interop_for_Desktop_105_154035

ArcGIS_Data_Reviewer_for_Desktop_105_154036

ArcGIS_Desktop_105_154030

ArcGIS_Desktop_BackgroundGP_105_154031

ArcGIS_License_Manager_Windows_105_154033

ArcGIS_Location_Referencing_Desktop_105_154068

ArcGIS_Workflow_Manager_for_Desktop_105_154037

ArcReader_Windows_105_154040

Database_Server_Desktop_105_154032

Mapping_and_Charting_Solutions_Desktop_105_154066

 

arcgis10.5全套下载链接   密 码:h3xj

2017年第十二届Esri全球开发者大会–开场

2017年,北京时间03月08日00:30,第十二届Esri全球开发者大会,在美国加州棕榈泉(Palm Springs, CA)举办,大会为期4天(北京时间03月8日-03月11日)。
本次大会开场进行了全球网上直播,世界各地的GISer都可以观看本次盛会。在开场视频中,重点提到了Esri今年对产品品牌提出的新主张—The Science of Where,那么该口号是怎么来的,以及该如何解读呢?暂且听听Esri总裁—杰克·丹杰蒙德是怎么阐述的。
PS:后半部分由大会主持人吉姆(Esri首席技术官,CTO)介绍大会的日程安排(没有翻译,有兴趣可以看看)。

360截图20170312213333191.jpg

在GoDaddy虚拟主机上安装ownCloud私有云

The Web Installer is the easiest method for newbies to install ownCloud on their web host like Godaddy or Hostgator. I will go through the installation and also troubleshoot some possible errors that might come up during the installation.

To Install ownCloud on GoDaddy you need:

0. Make sure to select a Linux server as a hosting server. If your site is not being hosted on a linux server or you’re unsure contact GoDaddy, let them know that you need a Linux server as your hosting server.

1. A domain name and hosting account. to be used for ownCloud only unless you know enough to troubleshoot errors without effecting an already running website on that hosting.

2. You need access to your hosting via FTP. Any hosting company will walk you through the FTP set up for free.

3. Go to ownCloud.org, click on Host ownCloud yourself button.

 

Installation:

1. In the Install OwnCloud Server window click on </>Web Installer button, this will open  Install ownCloud using the Web Installer window providing basic instruction on how to upload the file via FTP.

2. The first step has a link that says Right-click here, click on it to download the setup-owncloud.php.

3. Connect to your hosting via FTP and upload setup-owncloud.php to the root directory of your web host.

4. In the web browser enter http://www. yourdomain.com/setup-owncloud.php

5. Follow the instructions to install and configure ownCloud.

If you get “Magic Quotes is enabled. ownCloud requires that it is disabled to work properly.”

1. Access to your hosting via FTP. BACK UP the .htaccess and php.ini

2. Copy or drag out the php.ini to your desktop, right click, open with notepad.

3. In php.ini add these lines:

; Magic quotes for incoming GET/POST/Cookie data.
magic_quotes_gpc = Off
; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc.
magic_quotes_runtime = Off
; Use Sybase-style magic quotes (escape ‘ with ” instead of \’).
magic_quotes_sybase = Off

4. Save it and rename the php.ini to php5.ini

5. Upload php5.ini to the root directory of your web host.

kill web system processes on Linux shared hosting accounts:

    1. Log in to your Godaddy, Account Manager.
    2. From the Products section, click Web Hosting.
    3. Next to the hosting account you want to use, click Launch.
    4. In the Stats & Monitors section of the hosting Control Panel, click the System Processes icon.
    5. Click End Web and follow any prompts.
    6. Reload the phpinfo.php page to see if the desired changes have taken effect.
    7. Done!!!

if you get No input file specified error after disabling Magic Quotes:

Once OwnCloud is installed, Although GoDaddy supports PHP 5, the default PHP.ini file needs a little help. Open the php5.ini file to edit and add the following entry.

cgi.fix_pathinfo = 1

in case cgi.fix_pathinfo = 1 by it self didn’t work then also Configure the .htaccess file to deal with the proper security permissions needed for the application. Just replace the .htaccess file in the ownCloud root directory with this one. remember to back up before applying any changes. If it doesn’t work revert the owncloud .htaccess to original and replace the .htaccess file in the root directory with the following information.

ErrorDocument 403 /core/templates/403.php
ErrorDocument 404 /core/templates/404.php
< IfModule mod_php5.c>
php_value upload_max_filesize 513M
php_value post_max_size 513M
php_value memory_limit 512M
< IfModule env_module>
SetEnv htaccessWorking true
< /IfModule>
< /IfModule>
< IfModule mod_rewrite.c>
Options -Multiviews
RewriteEngine on
RewriteBase /
RewriteCond $1 !^(index\.php|css|gfx|js|swf|robots\.txt|favicon\.ico)
#RewriteRule ^(.*)$ /index.php/$1 [L]
RewriteRule .* – [env=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteRule ^.well-known/host-meta /public.php?service=host-meta [QSA,L]
RewriteRule ^.well-known/carddav /remote.php/carddav/ [R]
RewriteRule ^.well-known/caldav /remote.php/caldav/ [R]
RewriteRule ^apps/calendar/caldav.php remote.php/caldav/ [QSA,L]
RewriteRule ^apps/contacts/carddav.php remote.php/carddav/ [QSA,L]
RewriteRule ^apps/([^/]*)/(.*\.(css|php))$ index.php?app=$1&getfile=$2 [QSA,L]
RewriteRule ^remote/(.*) remote.php [QSA,L]
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
< /IfModule>
< IfModule mod_mime.c>
AddType image/svg+xml svg svgz
AddEncoding gzip svgz
< /IfModule>
Options -Indexes

WP Rocket最新版下载 WordPress缓存火箭加速优化插件

简单速度

不要把你的时间浪费在复杂的插件设置。
WP火箭发射后激活——最小的配置,取得立竿见影的效果。

页面缓存

缓存创建一个超快速的加载时间,对改善搜索引擎优化和提高转换率至关重要。当您打开WP火箭,页面缓存被立即激活。

预加载缓存

因为我们的抓取工具模拟一个访客来预加载缓存,您的网站被搜索引擎索引瞬间提高。

按需加载图片

只在你的访客向下滚动页面时加载图像,提高页面的加载时间。 YouTube和Facebook,雅虎等各大网站都使用这种技术。现在,你也可以做到。

静态文件压缩

WP火箭通过压缩减少了HTML、JavaScript和CSS文件重量。 轻文件意味着更快的加载时间!

开发人员友好

WP火箭的代码是根据WordPress的最佳实践开发。 它是干净的,评论和大量的钩子,所以开发人员可以很容易地使高级定制。

更多功能

WP Rocket网站优化插件推动你的wordpress网站高速运行,更多功能查看下面的与W3 Total Cache、Super Cache、 Hyper Cache的对比列表。

222下载链接:

WP Rocket最新版下载 WordPress缓存火箭加速优化插件链接   密码:57yy   链接失效请留言