Ground Coordinate Systems

Purpose: This technical note explains Grid-to-ground projections (AKA “ground coordinates”, “surface coordinates”, “localized coordinate networks”, etc.) within GeoCue. A ground coordinate system is a local coordinate system created by modifying the origin and scale of an existing projected coordinate system, such as a state plane or UTM grid system. The ground system is tied to…

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Assign Strip Numbers From Log File

Purpose: This technical note explains how to assign strip numbers to source (flight lines) prior to populating LAS working segments or generating TerraScan Trajectories. Most LIDAR system manufacturer software does not automatically assign file source ID to the strip based LAS files. Also, original strip numbers may not correspond with flight plan strip numbers. For…

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CueTip – Coordinate Reprojections, Datum Transformations and Geoid Adjustments in TerraScan

This technical note describes how to apply coordinate reprojections, datum transformations and geoid adjustments in TerraScan, and using similar methodology, TerraPhoto.  It covers the following topics: [A] Reprojection of Horizontal Coordinates. [B] Working with Different Units (Meters to Feet) [C] Adding a Datum Shift between WGS84 and NAD83 [D] Adjusting for Time-Dependent Variations in Datum…

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Generating Low Confidence Polygons

In the new ASPRS Positional Accuracy Standards for Digital Geospatial Data, low confidence areas within LIDAR data are defined to be where the bare earth model might not meet the overall data accuracy requirements. Generally speaking with LIDAR data this can occur where there is heavy vegetation that causes poor penetration of the pulses. If…

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GeoCue Knowledge Base Ready for Use

The GeoCue Group Knowledge Base is a one stop shop for information and support for all GeoCue Group products (Figure 1). Product information is available for AirGon, GeoCue, LP360 and Terrasolid. This searchable site makes finding information easy and fast. Search for product specific workflows, installation and licensing information, case studies or investigate the Frequently…

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Generate Point Density Image for Spatial Distribution

The USGS LIDAR Base Specification refers to Spatial Distribution and Regularity. It describes an assessment that is done, in addition to general point density assessments, to determine the regularity with which the a LIDAR point data collection is executed. The density images that allow one to follow the USGS specification for making the assessment can be…

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