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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Creating Island Breaklines in LP360

The following workflow and accompanying video describes the suggested workflow for digitizing breaklines around islands within LP360. Creating Island Breaklines: Workflow Configure a conflation task for the lake or main waterbody that the island resides within. Set up a conflation method for the conflation task This is dependent upon user specifications, the example in the video chooses…

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River Flattening in TerraModeler

Hydro-flattening is a common requirement when it comes to delivering surface models to the U.S. Geological Survey (USGS) National Elevation Dataset (NED). According to the USGS LIDAR Base Specification Version 1.2, a hydro-flattened surface refers to a specific kind of digital elevation model (DEM) that is required for inclusion in the NED. A hydrologically flattened…

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TerraModeler: Contour generation appears to not work

KBA-01040-J2X7B3 Problem The resulting contour design files are empty, or the contours are being generated as if there are no breaklines. Solution A couple of things to review: Verify that a classification routine, using a buffer and/or with closed shapes, to presumably the water or buffer class has been run on those laser points which…

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Breaklines, Part 5 – Enforce Varying Elevation

In the last edition of LP360 News, we discussed the creation of 3D breaklines for enforcing situations where the elevation must be a constant along the breakline. The most common example of this applications is “water body flattening” such as lakes and ponds. In this final installment of the breakline series, we will consider the…

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Breaklines, Part 4 – Enforce Constant Elevation

In the last edition of LP360 News, we discussed the creation of 3D breaklines. Recall that, for our purposes, a 3D breakline is a vector that has an elevation value (Z) associated with each vertex. Generally, 3D breaklines can be divided into two categories – those with the same elevation for each vertex (used for…

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Breaklines, Part 2 – Contours

In the previous issue of LP360 News, I introduced the use of Triangulated Irregular Networks (TIN) for modeling point derived elevation data as well as the basic concepts of “soft” breaklines. I realized when writing that first article that it is probably a useful exercise to review contours. Thus this part II article will be…

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Breaklines, Part 1 – An Introduction

One of the more powerful capabilities within LP360 is breakline capture and enforcement. In fact, many LIDAR production shops use LP360 as their tool of choice for supplementing point cloud data (derived from LIDAR or correlated imagery) with breaklines. But what are breaklines and how should they be used? Over the next several issues of…

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Breaklines should Undergo QA/QC

As with any data, breaklines should undergo a QA/QC process. For breaklines this should entail a check for potential topology errors as well as incorrect elevation values. Since breaklines are used to define and control surface behavior in terms of smoothness and continuity they may have a significant effect when incorporated in a surface model.

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