45 articles Articles
GeoCue Group’s reference library articles covering a wide variety of geospatial topics related to our various product lines.
Importing GeoTIFF to ArcGIS Does Not Project Data Properly
Currently ArcGIS, including 10.x and Pro, does not have a full implementation of Well Known Text (WKT) format for projection definitions in .prj format, specifically the COMP_CS tag and the way it handles False Easting and Standard Parallels. Two workarounds exist, for all versions of ArcGIS you can use the Define Projection geoprocessing task and…
Reprojecting Vector Features
Use the Add Files dialog and go to the Feature tab there is a checkbox for Transform Feature Files to Map SRS (Figure 1). You may need to create a new EVO project with the coordinate system you are changing to. Please note EVO does not support on-the-fly reprojection or mixing units of measurement, so you always want to have…
Converting Raster Data to Local Coordinate Systems with Scale Factor
Often clients require deliverables in local coordinate systems. True View EVO has the full ability to scale and transform point clouds to a local coordinate system. We are actively developing a built-in GUI method to scale and transform raster data, typically orthomosaics. Temporarily we have a workflow using a batch script that will perform this…
USGS LIDAR Base Specification
Abstract In late 2009, a $14.3 million allocation from the “American Recovery and Reinvestment Act” for new light detection and ranging (LIDAR) elevation data prompted the U.S. Geological Survey (USGS) National Geospatial Program (NGP) to develop a common base specification for all LIDAR data acquired for The National Map. Released as a draft in 2010…
Z Bump – Debias Operation Validity Testing
A common practice amongst GeoCue customers (and internally) is to use previously established control points to compare with an sUAS produced point cloud to gather absolute accuracy statistics. The vertical mean error from these statistics is often used to “Debias” a dataset. This is simply shifting the point cloud data to match the measured control…
What is the LAS Format?
LASer (LAS) File Format Exchange Activities What is the LAS Format? The LAS file format is a public file format for the interchange of 3-dimensional point cloud data data between data users. Although developed primarily for exchange of LIDAR point cloud data, this format supports the exchange of any 3-dimensional x,y,z tuplet. This binary file format…
Can’t open software with a shortcut
After updating/upgrading a program, double-clicking the shortcut fails to open and gives this dialog shown in figure 1, stating, Problem with Shortcut: The parameter is incorrect.”. What is the target (right click the shortcut > properties) for the shortcut? This can also be found going to “Open File Location” in the context menu. You can…
Breaklines in LP360- Part 3
Introduction to Part 3: In the last part of this series, we discussed in some detail how a Triangulated Irregular Network (TIN) can be constrained by features external to the point cloud model such as lines, points and polygons. In this month’s edition, we will look at contours and how LP360 can extract elevation information…
Breaklines in LP360- Part 2
This article is a continuation of the discussion of breaklines in LP360 (the standalone version). In last month’s installment, we discussed the overall concept of data modeling, especially the Triangulated Irregular Network (TIN). In this installment, I will discuss the general concept of adding constraints in the form of breaklines to these models. In future…