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Extremely fast smoothing methods for DEMs?

If I'm working with a DSM and encounter spikes, buildings I don't like, or other occlusions I want to flatten/smooth/raise/etc, my understanding is that I have to create a polygon around the object(s), then do advanced terrain editing, and adjust the height values. The problem with this is that it can be cumbersome:

1. You have to assign an ELEVATION_VALUE first, then adjust that. 
2. The polygons have to be redone for each section, which means multiple layers. 
3. This takes more time than, say, just creating a polygon by clicking around the object, right clicking, selecting "Smooth", and watching it disappear, leaving a relatively smooth surface that is even with the surrounding elevation. 

Is there a simple way to do this, or have I been doing it wrong this whole time? I know that with the LiDAR module this isn't a problem (assuming the points are classified properly and that one is using a point cloud vs. a DEM in the first place). I know there is software out there that does what I described above, but I'm hoping that Global Mapper + LiDAR Module does this so that I don't have to buy both software suites, just GM + LiDAR.


  • Any responses to this? I know the Alter Elevation Values is a thing, but is there a faster way? One that doesn't rely on making all corners of the polygon the same height?
  • MartecAMartecA Posts: 7
    A perfectly reasonable question and a shame that its gone unanswered.
  • bmg_bobbmg_bob Global Mapper Programmer Posts: 2,296

    You can use the Terrain Paint functionality to draw a rectangle and smooth the area within it. This was added in Global Mapper 22.0, and requires a Lidar Module license.

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