Maximum and minimum values change after I convert Raster to ASCII in ArcGIS

09-23-2021 10:22 PM
New Contributor

When i am trying to convert the clipped and filled raster of DEM to ASCII  most of the cell values turn to 'no data' values i.e -9999 even though there are no 'no data' values in the original DEM. Also my maximum and minimum elevation values also get changed during this process. Actually i need DEM in the TRIGRS software in ascii format.

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2 Replies
MVP Esteemed Contributor

when you clipped, did you use a perfect rectangle which was axis-aligned?

if not and you used some other shape, then the no data values represent the space between your clipping shape and what is returned (rasters are rectangular by definition)

... sort of retired...
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New Contributor

In the raster to ASCII tool, go to raster storage under environments and uncheck compression and uncheck build pyramids (maybe also set calculations to none?), that is how I got it to stop recalculating my min max values when using raster to ascii (plus rename extension .asc - why does it default to .txt?).

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