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I have been attempting to create a total cover map of a 4x4 kM target area.

I clipped the target area to my desired size and used the create polygon feature of ArcGIS to define all of the areas as 'meadow', 'roadside', 'uninhabitable' and 'wooded' ( I was very careful to make sure that all of my vertices on my multiple polygon layers connected so that there was no undefined space) .

I am trying to convert this entire 4x4 section into a seamless ASCII file so that it can be run by the program Circuitscape.

I have tried converting all of the polygons into individual rasters and running the mosaic rasters tool provided by ArcGIS, but this results in a huge mess.

any advice that can be offered?

  • Could you please describe how the result is not as you expected? – Aaron May 25 at 2:41
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With my limited exposure to Circuitscape, I would try the following workflow. I presume your polygons are to represent friction/resistance. I think the first thing is to make sure your polygons are coded properly. For this I would first use Dissolve tool as multipart option is True to make sure I have only four (or as many as your land covers) polygons representing your land covers. Then I would add and calculate a Float field to assign resistances, say wooded = 0.1, roadside = 9, etc., according to your conceptualisation. Following this, I can utilise Polygon to Raster tool by selecting previously created float field as the Value Field to have my resistance layer which will be a float raster.

As far as I can tell, you do not necessarily need a seamless raster to have the program run properly (NO DATA is treated as impassable) and one resistance raster will be sufficient (no need to create multiple rasters and mosaicking)

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