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If you were able to import your ascii file as an image, you already have a raster file. You should then check if the spatial reference is OK by adding another layer (e.g. open street map). If it is not well georeference, please provide the first lines of your ascii file otherwise there are too many possibilities for automatic or semi-automated ...


2

I suppose you did these 2 steps correctly: 1- calculate the statistics of the .asc file. 2- set the spatial reference of the .asc file. I don't think you have to import your .asc files into a geodatabase except you need to do special analysis that is not possible in ArcGIS with asc file. "when I do this to the original file and then import it will not ...


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There are many files called ASCII or GRID, it can be very confusing to work out which is which. A good text editor like Notepad++ or TextPad is invaluable in determining what you actually have. An Esri ASCII Grid will look like this: ncols 1000 nrows 1000 xllcorner 489000.000000000000 yllcorner 6679000.000000000000 cellsize ...



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