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Points2Grid Description

A Local Gridding Method for DEM Generation from Lidar Point Cloud Data

Points2Grid is a robust and scalable tool for gridding LIDAR point cloud data to generate Digital Elevation Models (DEMs). Points2Grid uses a local gridding method to compute grid cell elevation using a neighborhood defined around each cell based on a search radius provided by the user (see image below). Points2Grid offers two processing modes - in-core and out-of-core - to allow it to handle generation of rasters larger than available memory.

Points2Grid is used as the default DEM generation algorithm for the OpenTopography point cloud processing system, and thus been tested through thousands of DEM generation jobs. The local gridding approach employed by Points2Grid is most effective in situations where LIDAR shot densities exceed the resolution of the grid to be produced from these data.

Points2Grid has been confirmed to compile on Linux, Solaris, and Mac OSX. A port of the code to Windows is ongoing - when complete the Windows source and a GUI-based tool will be made available here. Note that an older version of P2G is currently available as a Windows GUI-based tool: winP2G Utility.

Points2Grid offers the following features:

* Reads input point clouds in ASCII and LAS formats
* Outputs grids in Arc ASCII and GRD ASCII formats
* DEM products including min, max, mean, and idw values
* Output of point count values for every grid cell
* User defined search radius and grid resolution
* Null filling, using a configurable moving window, to fill cells that have null values
* In-core and out-of-core processing modes to enable generation of grids larger than available memory. The user can define the threshold at which the code switches to out-of-core, based on the memory resources of their machine.

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