Fast TIN option’s influence on Contours

When generating contours from a gridded point cloud, issues can arise in the resulting contours.  This can cause horizontal offsets between lines from separate processing blocks resulting in contour lines that are split into multiple segments. Usually, the “Use Fast TIN” option is checked in the Las Properties dialog. The default value. This option uses…

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Engineering vs Cartographic Contours

Contours are polylines that are used to connect locations of equal value and show how values change across a surface model. Most of the time, elevation values are associated with contours, but any continuous data can be used, for instance: precipitation, pollution or even atmospheric pressure. When talking about contours it is not uncommon to…

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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 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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Adding the 3rd Dimension to Imagery

We often think of using LIDAR data either in simple operations for generating derived products, such as creating gridded elevation files, or for more esoteric operations, such as automatic extraction of building footprints. However, LIDAR data included as a standard layer in your ArcGIS® project (using LP360 for ArcGIS®, of course) can prove very useful,…

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