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I was wondering whether anyone might be able to tell me in layman's terms how to convert a polygon layer to a Grid file in ArcGIS 10.1 or ArcGIS 10.2?

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You should use the Polygon to raster function (which requires Spatial analyst extension).

In the Value field property you assign which field should be the base of your grid, e.g. which different values your grid will have.

Don't worry about Cell assignment type and Priority field, play with them if you don't get the desired result.

Depending on how close you would want to look at your grid, you should set the Cellsize parameter differently. A good starting point is 10 m (it will use the same units as your map in general), but decrease if the result looks pixly. I would not recommend going too low on this, since it will greatly increase the file size.

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Thank you very much – user28504 Mar 26 '14 at 21:32

For this kind of conversion, you need to choose the attribute field that you want to store in the grid, because a grid can only have one thematic information. This is the value field that you need to define.

Knowing that, you can use one of the "Feature to Raster" tools for the conversion, or in your case maybe Polygon to raster which is more specific (but you then need the 3D or Spatial Analyst extension, or an advanced licence).

For an output in a GRID format, your output workspace must not be a geodatabase, and you must not write any file extension.

When not saving to a geodatabase, specify .tif for a TIFF file format, .img for an ERDAS IMAGINE file format, or no extension for a GRID raster format.

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Thank you very much – user28504 Mar 26 '14 at 21:34

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