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NGS Releases New Educational Video! New Video on the Importance of Accurate Coastal Elevation and Shoreline Data This latest video explains the role of topo-bathy light detection and ranging (LIDAR) products in the National Geodetic Survey’s (NGS) mapping and charting program, and how these products provide a critical dataset for coastal resilience, coastal intelligence, and place-based conservation. Federal,…
FEMA’s elevation guidance document retires Appendix A of the Guidelines and Specifications for Flood Hazard Mapping Partners (Guidelines) and Procedure Memorandum 61 – Standards for LiDAR and Other High Quality Digital Topography, while modernizing the guidance to align with the USGS LiDAR Base Specification v1.2, ASPRS Positional Accuracy Standards for Digital Geospatial Data (Edition 1, Version…
In this video from NOAA’s video library they explain the basic concepts behind geodetic datums, where they are used, and why it is important to know about and use the correct datums. For more information on geodetic datums, visit http://www.geodesy.noaa.gov/.
Aimed at surveyors and GIS professionals who use geodetic-quality GNSS equipment to determine positions for land planning, coastal monitoring and other purposes, this video from NOAA’s video library covers best practices for reducing errors in the areas of: 1. location and environment, 2. equipment setup and 3. observation times and accuracy checks.
Sometimes when troubleshooting it can help us if we can get a system information dump for your machine. We need the information to comb through your settings and installed programs to look for anything that may be at odds with other machines or our test machines. Follow these instructions to complete a dump. To bring up…
In the LIDAR industry the generally accepted definition for Nominal Pulse Spacing (NPS) is the one detailed in the USGS base LIDAR Specification. That is the spacing between points in the collection when in reference to single instrument, single swath, first return only LIDAR point data. The NPS is a value that is usually predicted by…
The Global Encoding Bytes in an LAS file is a bit field used to indicate certain global properties about the file. In LAS 1.2 (the version in which this field was introduced), only the low bit is defined (this is the bit, that if set, would have the unsigned integer yield a value of 1).…
ASPRS (American Society for Photogrammetry and Remote Sensing) LAS Specification defines the attributed that can be stored in each point data record format (0 through 10). The chart below provides a summary as to which attributes can be stored in which format. Attribute 0 1 2 3 4 5 6 7 8 9 10 X…
Several months ago I signed up for the automatic update to Windows 10 that was to occur on July 29 (2015). Sure enough, early in the morning on July 29, my Windows Updates interface informed me that I could download the 2.5 GB Windows 10 update. I was pretty excited about this. Like many folks,…
The LIDAR community has been gradually adopting the terminology “Quality Level” to categorize airborne LIDAR data. The idea is to use a simple scheme to characterize the more important features of a LIDAR data set into a few broad groups designated QLn where n is the quality level. LIDAR Quality Levels – Part 1
