Handling elevation outliers in a Dem

A task is then processed to handle the elevation outliers in the DEM raw data.

Think about it, before the construction of the DEM leveled near the building, then the elevation outliers should be how to deal with it?

It is obvious that the direct shovel is not reasonable at ordinary times and needs to be interpolated with the elevation around outliers (no high-precision Dem).

Ideas are as follows:

1, first set up a polygon layer, manually circled the outliers of the area.

2. Create a point layer to sample some points around the outliers box selection.

3, according to the point and polygon layer interpolation processing, using inverse distance weighting method, which interpolation method good need to consider, using local interpolation method. If there is a high-precision DEM, this step will not be interpolated, directly cut out on it.

4, the polygon layer is rasterized, and then after some steps to generate 0, 1 raster diagram.

5, using the raster calculator, the original DEM by multiplication operation to 0, and then use the addition operation to add the elevation value.

This completes the process.

refer to an additional article: http://www.cnblogs.com/yhlx125/archive/2013/03/06/2946342.html

Handling elevation outliers in a Dem