Please see Ernest’s new blog on direct Georeferencing. This is a a great site to learn about GPS and IMU technology. please click on the link below to check out this blog. I will also create a link to this blog on my blog menu.
Also see the first video blog about direct georeferencing by clicking this link Video Link
Filed under LiDAR technology
Pre-order your copy of
ASPRS Airborne Topographic Lidar Manual
Michael Renslow, Editor
not later than October 1, 2012
and Save 20% off post publication price
The ASPRS Airborne Topographic Lidar Manual is the first comprehensive manual published on lidar technology. Edited by Michael Renslow, an industry leader on the topic, the book pulls chapter material from lidar industry experts worldwide.
Contents included covers:
· Chapter 1 — A brief laser history, as well as terminology and definitions
· Chapter 2 — An overview of ALS Technology, including operating principles, key elements of ALS systems and their major functions, types of steering of a laser beam full waveform lidar, and the first information available on FLASH lidar
· Chapter 3 — Discusses enabling technologies – both spaceborne and ground
· Chapter 4 — Covers Airborne installation and integration of ALS systems including rotary-wing and fixed-wing platforms
· Chapter 5 — Guidelines for lidar data collection describes flight mission planning, planning of ground reference stations, in-flight calibration of ALS systems, flight operation guidelines for pilots, and in-flight quality control
· Chapter 6 — Covers data processing workflow, pre- and post-processing, as well as data accuracy and quality assurance.
· Chapter 7 — Outlines the status of the lidar industry support systems, including fixed-wing and rotary systems, lidar data management, and the LAS data format.
· Chapter 8 — Deals with combining lidar data with complementary technologies.
· Chapter 9 — Gives current accuracy standards and guidelines, including examples of lidar-specific metadata tags
· Chapter 10 — Gives detailed coverage of various applications for lidar use
The book includes an appendix of the GEOID models and vertical datum, quality control processes for data users, an example of lidar metadata, and a glossary.
Save 20% off by ordering your copy now, for shipment in November 2012.
List price: $150 $120 ASPRS Member Price: $95 $76 ASPRS Student Member Price: $75 $60
American Society for Photogrammetry and Remote Sensing
5410 Grosvenor Lane, Suite 210, Bethesda, MD 20814
Phone: 301-493-0290 Fax: 301-493-0208 www.asprs.com
Filed under LiDAR technology
A lot of people are confused about Full waveform and How it works. With the help of Leica, I put together a presentation on full waveform and thought I would Share it with everyone.
Filed under LiDAR technology
Check out the link below and click on the video links at the bottom of the page to see the radiohead video and the navigation video. These are pretty cool applications of LiDAR that this group is doing.
Filed under LiDAR technology
The following is a good representation of corn rows in LiDAR data. Corn rows appear for a number of reasons and can be seen in a single scan or in overlapped areas of two adjoining scans. The corn rows in a single scan can be caused by the back and forth scanning of the system. The manufactures say that any given point needs to be within a certain distance of the actual location on the ground. Well this means that that point measurement can be below the actual elevation on the ground or above the actual elevation of the ground. This makes the distance between the points greater creating the appearance of corn rows. Since the error of a LiDAR sensor is greatest at the edge of scan these corn rows are most apparent at the edges of scans. The presents of corns rows is compounded when you have overlapping flight lines because of the inherent error of the scanner or measurement of any given point, the back and forth scan pattern and difference between the elevation measurements between the two scans. This differences will usually be a result of bad calibration. A lot of processing techniques have been developed to remove corn rows but almost always you can see some existences of corn rows in raw LiDAR ( unclassified strips ). The manufactures of LiDAR systems have improved on this issue and continue to make their systems better. The only time I have seen no existence of corn rows is from a system that generates scans in a single direction but I am confident that at some point the technology will improve to the point that we don’t have to talk about corn rows as a result of system function. If you have any insight on the latest systems or systems that address this issue effectively please let me know or leave a comment.
Filed under Lidar sensor, LiDAR technology
Hexagon Geosystems Geospatial Division is proud to announce the release of the ALS70, our latest airborne LiDAR system. There are many new innovations in the ALS70 and we wanted to share this news with you.
Leica Geosystems announces the release of the new ALS70 family of airborne LiDAR systems. The new product line, consisting of ALS70-CM City Mapper, ALS70-HP High Performance and ALS70-HA High Altitude models, covers the entire range of LiDAR mapping applications, and represents a significant advancement in the state-of-the-art for airborne LiDAR.
Industry-Leading 500 KHz Pulse Rate
According to Ron Roth, Product Manager for Airborne LiDAR at Hexagon Geosystems’ Geospatial Solutions Division, “The market constantly demands higher productivity from airborne sensing systems to reduce the equipment and labor costs associated with data collection, but this cannot be done at the expense of data quality. By incorporating Point Density Multiplier technology, we were able to develop a LiDAR product that offers an industry-leading 500 kHz pulse rate and 200 Hz scan rate, for ultra high point density and unrivaled control over the point pattern on the ground. This new technology gives the superior data acquisition productivity that our customers desire, without the complexity of multiple lasers or scanners.”
New Detection Circuitry
“In addition to Point Density Multiplier, ALS70 incorporates new detection circuitry providing superior sensitivity to small or low-reflectivity targets. This has proven itself already on power line data acquisition, where even the smallest high-voltage and ground wires can be readily measured” explains Ron Roth.
Upgradeability of Existing Leica ALS60 Systems
“Market acceptance has been extremely encouraging, with 8 systems, representing the entire product line, delivered already. Because this technology is based on the proven Leica ALS60 platform, existing ALS60 systems can be transformed into the new model, thus preserving current customers’ investments” concludes Ron Roth.
Filed under Lidar sensor, LiDAR technology
I had a client talk to me about how to calculate the pulse accuracy. In the industry we do a lot of testing of the relative accuracy and the absolute accuracy as it relates to a complete data set but what do we do to test the actual accuracy of the pulse and the returns from the pulse. I saw a presentation given by a gal named Nora who was at The Ohio State University and now works for FUGRO. She and her professor did an extensive study along a highway corridor using targets to test the accuracy of the returns. When I used to help make and develop systems we used surveyed Targets at .5 miles, 1.0 miles and 2.0 miles on a horizontal test range, located on a very flat plateau to measure the accuracy of the return and calculate the “laser zero” or location of the point of origination of the laser, so that the length of the pulse return can be calculated very accurately. I was wondering if anyone has additional information on how they measure the accuracy of the pulse or return of Laser in a LiDAR system and does this get checked every so often. Is there any potential issues with this and How do you quantify the atmospheric characteristics with a data set in different climate regions and if you feel this is really an issue or not and why? It was very apparent to me that flying in very humid conditions the result varied in relationship to flying in very dry regions. Just looking to see what folks are doing in this area or if it really matters to anyone because I can see why he asked this question.
Filed under LiDAR technology
There has been alot of talk about LightSguared 4G network and the problems it will cause for GPS based on the frequency it would operate at. please click on the link below for the article
Filed under LiDAR technology
There has been alot of talk about using LiDAR for solar mapping and alot of universities have been doing this but I wanted to direct you to a company with a pretty cool process using LiDAR for solar mapping. If you have other links to this technology or agencies or companies doing similar stuff or anything Solar with LiDAR let me know and I will post a link.
Filed under LiDAR technology
This is an interesting new LiDAR blog. Check it out. They are talking about Flash LiDAR in the latest post. There are some new flash LiDAR at 256×256 but the cost can be very expensive. I think these systems provide potential for uses within our industry but show some serious potential in other industries like space or aviation. It will be interesting to see how this technology develops.
Filed under LiDAR blogs, LiDAR technology
