topic Re: Ascii to Raster Conversion help in Python Questions

Ascii to Raster Conversion help

ClaireParsons — Mon, 24 Oct 2011 17:16:04 GMT

Hope someone can help - I've written this script several times in the past but unfortunately my laptop is being serviced and I forgot to backup my python scripts directory - ~DOH 😮

Anyway, this should be really simple - I'm looping through some ascii files in a directory and converting them to a raster. However, Python returns the error - Failed to execute (ASCIIToRaster).
I know the ascii file is there as I have manually converted in toolbox and its fine. I've posted the code below.

# Import arcpy module
import arcpy
from arcpy import env

# Local variables:
env.workspace = "C:/Data/asc"
outputraster = raster.rstrip("dtm.asc")
datatype = "FLOAT"

#Get a list of ascii files
rasterList = arcpy.ListRasters()

for raster in rasterList:
arcpy.ASCIIToRaster_conversion(raster,outputraster,datatype)

Re: Ascii to Raster Conversion help

HemingZhu — Mon, 24 Oct 2011 17:46:13 GMT

Hope someone can help - I've written this script several times in the past but unfortunately my laptop is being serviced and I forgot to backup my python scripts directory - ~DOH 😮

Anyway, this should be really simple - I'm looping through some ascii files in a directory and converting them to a raster. However, Python returns the error - Failed to execute (ASCIIToRaster).
I know the ascii file is there as I have manually converted in toolbox and its fine. I've posted the code below.

# Import arcpy module
import arcpy
from arcpy import env

# Local variables:
env.workspace = "C:/Data/asc"
outputraster = raster.rstrip("dtm.asc")
datatype = "FLOAT"

#Get a list of ascii files
rasterList = arcpy.ListRasters()

for raster in rasterList:
arcpy.ASCIIToRaster_conversion(raster,outputraster,datatype)

The issu is outputraster = raster.rstrip("dtm.asc"). It does not create "dtm". Try use
outputraster = raster.split(".")[0] instead

Re: Ascii to Raster Conversion help

ClaireParsons — Mon, 24 Oct 2011 17:56:23 GMT

dtm is in the file name so have used rstrip("dtm.asc") to strip dtm and asc from the filename so it doesn't exceed 13 characters - so not sure this is the answer as its the input file it can't find!

***Extra note - just ran your suggestion and same issue - for some reason it is saying the input file doesn't exist which is bizarre when it has got the name from the rasterlist which has just cycled through that folder!!!
ERROR 000865: Input ASCII raster file: sx0051dtm.asc does not exist

Re: Ascii to Raster Conversion help

ScottBlankenbeckler — Mon, 24 Oct 2011 18:10:07 GMT

env.workspace = "C:/Data/asc"

shouldn't this read env.workspace = r"C:/Data/asc" ??

Re: Ascii to Raster Conversion help

HemingZhu — Mon, 24 Oct 2011 18:28:04 GMT

dtm is in the file name so have used rstrip("dtm.asc") to strip dtm and asc from the filename so it doesn't exceed 13 characters - so not sure this is the answer as its the input file it can't find!

***Extra note - just ran your suggestion and same issue - for some reason it is saying the input file doesn't exist which is bizarre when it has got the name from the rasterlist which has just cycled through that folder!!!
ERROR 000865: Input ASCII raster file: sx0051dtm.asc does not exist

Hard code the input and output path to see if it works.

Re: Ascii to Raster Conversion help

HemingZhu — Mon, 24 Oct 2011 18:51:50 GMT

shouldn't this read env.workspace = r"C:/Data/asc" ??

env.workspace = r"C:\Data\asc"

Re: Ascii to Raster Conversion help

ClaireParsons — Mon, 24 Oct 2011 18:59:55 GMT

Ok if you hard code the paths and run the script on a single file it works.
So, I'm wondering whether its ListRasters or the For loop - can't remeber having this problem before!!

EXTRA NOTE***** - Is there any other way I can get a list or loop through files in a folder?

Re: Ascii to Raster Conversion help

HemingZhu — Mon, 24 Oct 2011 19:25:09 GMT

Ok if you hard code the paths and run the script on a single file it works.
So, I'm wondering whether its ListRasters or the For loop - can't remeber having this problem before!!

EXTRA NOTE***** - Is there any other way I can get a list or loop through files in a folder?

env.workspace = "C:/Data/asc"
for file in arcpy.ListFiles("*.asc"):

Re: Ascii to Raster Conversion help

ClaireParsons — Sun, 12 Dec 2021 07:38:05 GMT

Hi thanks for your reply but this still isn't working. I've changed the script a little bit so it prints the file names before commencing the conversion(or not!!), to ascertain that its creating the list, which incidentally it is.

import arcpy
from arcpy import env
import os

env.workspace = "C:\\Data\\asc"
listFiles = arcpy.ListFiles("*.asc")
for file in listFiles:
    outfile = file[:6]
    infile = file
    dtype = "Float"
    print file
    print outfile
    arcpy.ASCIIToRaster_conversion(infile, outfile, dtype)

I'm desperate for some advice on this as I have some files to convert for a client tomorrow 😞

thanks
Claire

Re: Ascii to Raster Conversion help

RaphaelR — Sun, 12 Dec 2021 07:38:08 GMT

maybe you can try the glob module instead of listrasters?

import glob,os
import arcpy

path = r'C:\Data\asc'
arcpy.env.workspace = path 
os.chdir(path)

try:

    # Make a list of asc files in the workspace
    listAsc = glob.glob('*.asc')
        
    for currentFile in listAsc:

        # Find the current file name and path
        name = currentFile[:-4]
        textFilePath = path + '/' + currentFile       

        # Create a raster from the current file
        arcpy.ASCIIToRaster_conversion(textFilePath,name + '.tif','FLOAT')
        print(arcpy.GetMessages() + "\n")    
    
        
# Get error messages
except:
    arcpy.GetMessages(2)

Re: Ascii to Raster Conversion help

JustinDix — Wed, 07 Dec 2011 15:34:07 GMT

I too am trying to batch convert 137 asc files to raster using the python script - I can make the function work for individual files:

import arcpy
arcpy.ASCIIToRaster_conversion("c:/data/elevation.asc", "c:/output/elevation", "INTEGER")

But cannot get it to batch work. I tried to follow the thread below (although I couldnt see if it was actually successful?) but to no avail. This is my first day of Python so could just be my ignorance. Any help greatfully received.

Re: Ascii to Raster Conversion help

WhitneyKirkendall — Thu, 11 Oct 2012 23:49:02 GMT

Just add the path to the name of the ascii file for each member of your list as you go through a loop.

I got it to work like this...

for asc in ascList:
[INDENT]asc = path+"\\"+asc[/INDENT]
[INDENT]arcpy.ASCIIToRaster_conversion(asc, asc[:-4]+".img" , "FLOAT")[/INDENT]