Month: December 2017
CueTip – County Coordinate Systems
When working with data in county coordinate systems, the definitions of datum transformations are important. The steps in this CueTip provide recommendations and an example of such a project; beginning from project setup, to selecting appropriate Coordinate Reference Systems (CRSs), to properly defining the coordinate transformations. Please consult with your surveyor to determine the appropriate…
Crash when reading in lots and lots of LAS Data
Problem: An LP360 crash can occur when attempting to read in a lot of files. This can occur when opening the ‘Add Files’ dialog and browsing to the files’ location to add them into the session. Due to the way that browsing control works, this can get overwhelmed with a large number of files, causing…
Breakline Buffer Classifications
Buffer classifications (or Ignored Ground in the USGS Lidar Base Specification) are those classes that are assigned to LAS points that are within a user defined-distance of breaklines. Points that are assigned to these classes are excluded from the surface when using breakline enforcement. Typical distances used are one quarter to one half the nominal…
Regedit for Population Error
Problem: While attempting to populate LAS Working Segments the process errors with an exception. In the system message column of the Checklist Step History you note the following exception: System.ArgumentException: Source array was not long enough. Check srcIndex and length, and the array’s lower bounds. at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32…
CDS Processing Priority
In the GeoCue Command Dispatch System (CDS) the Processing Priority (or simply priority) determines the processing order of subtasks that could otherwise process in any order. Priority in the CDS is a floating point number ranging from 0.0 to MAX_FLOAT. Higher values are considered higher priority. For example, assume that two LIDAR Orthos are in the…
LIDAR Server Having Problems Running in Edge Browser
Problem: Trying to load LIDAR Server (www.lidarserver.com) in Microsoft Edge browser and the load doesn’t complete. No errors, just no project list. Probable Resolution: Clear the cache in Edge and refresh the page. To clear cache data in Edge, click the ellipsis (…) located at the top right corner -> Settings -> Choose What to…
Using LP360 Feature Analyst to QA/QC Building Extraction Results
LP360 now has a full set of feature analysis and editing tools for working with the geometries of features – points, lines and polygons – in your project[1]. As often happens with LP360 features, the initial driver for adding this capability was a very specific problem; editing the toes of stockpiles being used in volume…
The Accuracy Triangle – The Photogrammetric Triad
We get a lot of questions regarding accuracy in drone mapping projects. These questions range from ground control layout suggestions to the necessity of calibration cameras. Sometimes it is useful to step back a bit and take a wholistic view of the elements that impact photogrammetric accuracy. The information in this article is meant…
Deciphering the Compatibility Group
In the LP360 Add Files dialog there is a Compatibility Group column in the Advanced Columns section. The letter assigned in this column to each file contain some insight into which LAS files can go on the same layer based on their version, PDRF, and GPS Time Format. The Spatial Reference System (SRS) of the LAS…