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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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Point Cloud Tasks

Point Cloud Tasks What is a Point Cloud Task (PCT)? A function (Extract ground, Conflate Line) that operates on points and/or vectors. A task can be a filter and/or an extractor. A filter classifies or changes the classification values for points (e.g. classify ground). An extractor extracts information from the point cloud data into vector,…

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A Framework for Control Strategies

We do a significant amount of Research and Development (R&D) in drone mapping.  Our AV-900 rotary wing system has an L1/L2 Global Navigation Satellite System (GNSS) that we run in the Post-Processed Kinematic mode.  This gives us the location of the AV-900 Survey System antenna to within a few centimeters relative to a local base…

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Geometry not within read/write loaded point extent (10075)

Problem: Receive either a “Classify is Complete” or a “ClassifyByGeometry function fails” with an overall message, or by feature messaging, indicating “Geometry not within read/write loaded point extent (10075)”. Probable Resolution: The warning message indicates that the LAS files intersecting with the indicated feature are not open for read/write, hence, no classification based on that…

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Easter Eggs in LP360

LP360 contains a number of “non-obvious” commands (usually keyboard activated shortcuts). This page has been updated for LP360 v2017.1. General: Live View – When opened in one view can be left open and by clicking the Live View button in a different view the settings will change to that view’s current state Change Languages – See the…

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Thinning Feature Vertices in LP360

We have lot of LP360 customers with a variety of disparate feature collection and editing needs.  To begin to address these needs, we introduced a completely new set of Feature Edit tools in the 2016/2017 releases of LP360 (standalone).  Last month I introduced the new Feature Analyst tool that will be available in LP360 2017.1…

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Remove overviews from image

Problem: When loading an orthophoto image into LP360/Topolyst no image is displayed, yet when you zoom in it becomes visible. Modifying the LP360 image display properties shows the image extents properly and the header checks out. Probable resolution: We suspect that the overviews in the image file are corrupt/invalid. One can use the GDAL tool to…

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Exporting LAS files failed (22684)

Symptom: While exporting data from LP360 using the Export Wizard a COM Exception is encountered stating, “Caller’s Message: Exporting LAS files failed. (22684) Exception Information: HRESULT: 0x80004005 Unable to retrieve extended COM error information.” Probable Resolution#1: Do you have any LAS files that contain only a single point? If so, remove that file and try…

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LP360 and Topolyst Feature Analyst

Feature Analyst is an exciting new tool that will appear in LP360/Topolyst 2016.2.  To motivate this discussion, I will provide a synopsis of a few use cases for Feature Analyst here.  A detailed look at these cases is presented at the end of this article.  Examples of tests you will be able to perform with…

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