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I have several raster of about 13 kms x 13 kms square, high resolution and would like to know if there is a way to extract all the impervious areas from it


rusty
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I would like to extract things like concrete driveways, road surfaces, any other hard surfaces, to calculate areas. The Rasters I have, are taken several years apart and would like to calculate the change in surface areas.

2 replies

Forum|alt.badge.img+2
  • February 15, 2023

@rusty​ FME doesn't really include feature extraction in the raster tools. You can create a classified raster, if there is a clear distinction between the characteristics (RGBA) of the impervious pixels. Some ideas here. So the raster tools might be RasterExpressionEvaluator , RasterCellValueCalculator or RasterCellValueReplacer and then RasterToPolygonCoercer.


rusty
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  • February 15, 2023

Thank you, I will give that a try and see what I can do, sounds feasible. I was thinking there must be an easier way than that, but we will try that for sure much appreciated.


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