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I'm trying to import data into Arc in ASCII format, however, I have no idea what to use for the "cellsize" for the ASCII format of the data (the original data I have is in excel where each excel cell represents a grid/cell from a model output).

I need the "cellsize" to correspond to the actual area of the grid/cell from the model output on the map in ArcMap. The dimensions of the grid/cells from the model are 7000 meters X 7000 meters. How does this 7000 meters in ArcMap correspond to the value I enter for "cellsize" in ASCII format?

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  • How are you "trying to import data into Arc in ASCII format"? i.e. what tool and parameter values are you using, and how does the result observed differ from what you are expecting? Also, I note that you have not yet taken the Tour that introduces users to our focussed Q&A format.
    – PolyGeo
    Apr 19, 2016 at 22:35
  • Can you provide a sample of the data?
    – user2856
    Apr 21, 2016 at 5:14

2 Answers 2

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Are you trying to use the ASCII to Raster tool in the conversion toolbox? If so, your ASCII file needs a header before tool execution. The header listings are the number of columns, number of rows, the lower left x coordinate, the lower left y coordinate, and a cell size (7000), and a no data value (-9999 maybe)

NCOLS xxx

NROWS xxx

XLLCORNER xxx

YLLCORNER xxx

CELLSIZE xxx

NODATA_VALUE xxx

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  • @GBC here is the link to ASCII to Raster tool to help support your answer.
    – TsvGis
    Apr 20, 2016 at 22:58
  • Yes, I have the header. I am wondering what to put for "cellsize" so that the cell/grid size from the model output that I have matches the actual area on a map in Arc. Apr 21, 2016 at 14:10
  • Is the full extent of your data 7000 x 7000 meters or is each cell from your model 7000x7000? If the cell is 7000x7000 then 7000 is the cell size in the header. If the extent of the data is 7000 then the cell size is 7000/number of columns.
    – GBG
    Apr 22, 2016 at 15:30
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Can you import the ASCI grid as point shapefile? If so, you could try converting the point layer into a raster. You could also use the measure tool to determine the distance between points (just make sure you are in a projected CRS.)

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