topic Re: Raster to ascii in Geoprocessing Questions

Raster to ascii

AprilReside — Mon, 02 Apr 2012 04:19:02 GMT

Hi,
I am trying to convert a raster to ascii in ArcMap 10, but I can only get an output with the .txt file extension - even when I specify .asc
can anyone help?
thanks heaps,
April

Re: Raster to ascii

DanPatterson_Retired — Mon, 02 Apr 2012 11:55:40 GMT

why don't you just rename it outside of arcmap?

Re: Raster to ascii

MathewCoyle — Mon, 02 Apr 2012 13:31:10 GMT

Are you sure it isn't appending .TXT to the end of your output? You need to specify the extension if you don't want it to be text directly in the tool parameter.

Re: Raster to ascii

curtvprice — Sun, 12 Dec 2021 00:52:12 GMT

I am trying to convert a raster to ascii in ArcMap 10, but I can only get an output with the .txt file extension - even when I specify .asc

Esri has named this .txt so it easily opens in a text editor from Windows (a good call, IMHO).

If you need the .asc extension for some reason, you could use the Calculate Value tool to rename the file in ModelBuilder with a short python script:

expression:

newext(r"%output ascii txt%","asc")

code:

def newext(file,ext):
    import os
    newfile =  os.path.splitext(file)[0] + "." + ext
    os.rename(file,newfile)

Re: Raster to ascii

AprilReside — Tue, 03 Apr 2012 02:53:53 GMT

Hi all,
Many thanks for the help! It seems that changing the extension .txt to .asc outside of ArcMap worked fine. Thanks

Re: Raster to ascii

SteveLynch — Tue, 03 Apr 2012 20:47:16 GMT

April

The default extension in the RasterToASCII GP tool is .txt, however, you can also use .asc

These are the 2 extensions to use. If you create it using the .asc extension then it becomes a supported raster data format, i.e. you can use it in ArcGIS as any other raster dataset (no need to then use ASCIIToRaster).

Please can you share a screenshot of the dialog or are you doing it via scripting.

Thanks
Steve

Re: Raster to ascii

OliverBurdekin — Thu, 06 Dec 2012 17:13:50 GMT

Hi Guys,

I've been trying this out and need to do it pro grammatically as I have a lot of rasters I am iterating through to convert to .asc. I tried specifying this in the raster to ASCII tool but then I end up with %filename%.asc.TXT I also tried the suggestion above of using calculate value. I get this error when I run it:

Executing: CreateEnvLayersFile C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\asc2 C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\tmin_clip NOT_RECURSIVE
Start Time: Thu Dec 06 14:12:56 2012
Executing (Iterate Rasters): IterateRasters C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\tmin_clip # # NOT_RECURSIVE
Start Time: Thu Dec 06 14:12:57 2012
Succeeded at Thu Dec 06 14:12:57 2012 (Elapsed Time: 0.00 seconds)
Executing (Raster to ASCII): RasterToASCII C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\tmin_clip\clip_tmin_1 C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\asc2\e_clip_tmin_1.TXT
Start Time: Thu Dec 06 14:12:57 2012
Succeeded at Thu Dec 06 14:12:59 2012 (Elapsed Time: 2.00 seconds)
Executing (Calculate Value): CalculateValue newext("C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\asc2\e_clip_tmin_1.txt","asc") "def newext(file,ext):\n import os\n newfile = os.path.splitext(file)[0] + "." + ext\n os.rename(file,newfile)" Variant
Start Time: Thu Dec 06 14:12:59 2012
ERROR 000539: Error running expression: newext("C:\Users\OJB\Desktop\BurdsGIS\CollabPapers\Mimeticus\WorldClim\asc2\e_clip_tmin_1.txt","asc") <type 'exceptions.WindowsError'>: [Error 123] The filename, directory name, or volume label syntax is incorrect
Failed to execute (Calculate Value).
Failed at Thu Dec 06 14:12:59 2012 (Elapsed Time: 0.00 seconds)
Failed to execute (CreateEnvLayersFile).
Failed at Thu Dec 06 14:12:59 2012 (Elapsed Time: 3.00 seconds)