34 articles Articles

zLAS File Format

Files with a zLAS extension are usually the ESRI proprietary LAS compression format. The ESRI LAS Optimizer improves archiving, sharing, and use of LAS format LIDAR. Optimization is accomplished in several ways: Lossless compression Spatial indexing Statistics generation The compression ratio the optimizer can achieve is typically much better than generic compressors. This is because…

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Mapping the Battle of Gettysburg – Little Round Top Revealed

GeoCue Group recently partnered with the National Park Service (NPS) in a pilot project to assess culturally significant areas within Gettysburg National Military Park using small unmanned aerial systems (sUAS). The area of interest (AOI) for this project was the western face of Little Round Top. Little Round Top was the location of a defensive…

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Downloading CSV, PDF, and Layers from Reckon

To download data from Reckon,  first select the date from the drop down menu that corresponds to the data you wish to download.  The layers associated with this date should be displayed in the Table of Contents on the left side of your screen.  Left-click the layer name and select from the list of options…

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Ground targets for horizontal check for LIDAR data collection

An important evaluation to make when performing a QAQC analysis of a LIDAR data set is a control point comparison. Typically, this refers to checking the vertical accuracy of a LIDAR data set. In regards to vertical check/control point location: “Unlike horizontal checkpoints, vertical checkpoints are not necessarily required to be clearly defined or readily…

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Hardware recommendations for faster processing

If you’re i/o bound, which is usually the case with LIDAR or photogrammetric point cloud processing, you need to figure out what kind of i/o you’re doing at the bottleneck. Case 1: If you’re just waiting for a single tile to load, your slowdown may be from low RPM HDD, but more likely you’re hitting…

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NGS Releases a New Video on the Importance of Accurate Coastal Elevation and Shoreline Data

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,…

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FEMA – Guidance for Flood Risk Analysis and Mapping – Elevation Guidance

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 Specifications v1.2, ASPRS Positional Accuracy Standards for Digital Geospatial Data (Edition 1, Version…

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Best Practices for Minimizing Errors during GNSS Data Collection

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.  

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