If you have a river polygon that has been downstream constrained you may wish to QC your work to ensure the downstream constraint result is as desired. LP360 has a Downhill Vertical Test which does not work on polygons, but does work on polylines. This article covers how to test and correct downhill continuity on…
With the release of LP360 v2017.1 we began recommending that users create their breaklines using LP360 instead of the previous recommendation of using the LP360 Sketch tool in LP360 for ArcGIS. One common question that has come up is how does one create a flat 2D feature and put the summarize Z results in the…
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…
Sometimes, when a Conflation Type Point Cloud Task is executed for multiple features, it can appear to delete executed features when the feature type is changed. This occurs when the PCT is configured to run using Tool Geometry and the Output mode is “Append”, and the user changes the type of feature being created.…
In the January issue of GeoCue News, we discussed the new Point Cloud Task (PCT) overhaul that we released in LP360 2013.2. The focus of the last article was on the new Input/Output Manager (IOM) for setting the inputs and outputs of the various PCTs that LP360 provides. In this month’s article I will describe…
As we have discussed in the last two issues of LP360 News, breaklines are two- or three-dimensional graphic data (points, lines, polygons) that we introduce into an elevation model to alter the topology. When working with Geographical Information System (GIS) models, we nearly always model complex, irregular elevation data as a Triangulated Irregular Network (TIN).…
