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  • 1.  Python Raster Clip error

    Posted 03-02-2023 22:49
    Edited by Peter Møller 03-03-2023 03:25

    Hi,

    I took this code from another post (Luke Lynx; Run MapInfo Raster Clip operation through python) and updated it for my version of MI Pro (21.3) and am getting the following error and would greatly appreciate some guidance. It appears to be related to the file extension. Kathy

    ERROR: 

    RasterException : Invalid file extension.
       at MapInfo.RasterEngine.Common.MIRasterError.VerifyRetValue(Int32 iRetVal)

       at MapInfo.RasterEngine.Operations.RasterProcessing.Clip(String inputRasterFilePath, String inputTabFilePath, String outputRasterFilePath, String outputRasterDriverID, Boolean retainInsideRegions, RasterApiOptions apiOptions, IRasterProgressTracker progressTracker)

    CODE:

    #Raster Clip Operation using Tab File Input

import string
import clr
import os
import sys
from os.path import abspath, join, dirname, exists

sys.path.insert(0,"C:\\Program Files\\MapInfo\\Professional\\Raster")

clr.AddReference("MapInfo.RasterEngine.IO")
clr.AddReference("MapInfo.RasterEngine.Common")
clr.AddReference("MapInfo.RasterEngine.Operations")

from MapInfo.RasterEngine.Operations import RasterProcessing
from MapInfo.RasterEngine.Common import RasterInputDetails, RasterApiOptions, RasterClipExtent
from MapInfo.RasterEngine.IO import DriverIDExtensions, DriverID

#Input and output file path
rasterInput = r"C:\\path_to_input\\filename.mrr"
rasterOutput = r"C:\\path_to_output\\output_filename.mrr"
outputRasterDriverID = DriverIDExtensions.GetString(DriverID.ASC)
tabInput = r"C:\\path_to_geometry_to_clip raster_to\\Vermont.tab"

retainInsideRegion = True

apiOptions = RasterApiOptions(RasterClipExtent())

RasterProcessing.Clip(rasterInput, tabInput, rasterOutput, outputRasterDriverID, retainInsideRegion,



    ------------------------------
    Kathy Gillis
    AT&T
    SAN RAMON OR
    ------------------------------



  • 2.  RE: Python Raster Clip error

    Employee
    Posted 03-03-2023 03:28

    Hi Kathy

    It seems your code is missing a bit in the end. It may just be a single parameter in the RasterProcessing.Clip line.

    I'd suggest that you try to change this line:

    outputRasterDriverID = DriverIDExtensions.GetString(DriverID.ASC)

    to

    outputRasterDriverID = DriverIDExtensions.GetString(DriverID.MRR)

    The line tells the processing the format is ESRI ASC but it seems both your files are in fact MRR files.



    ------------------------------
    Peter Horsbøll Møller
    Principal Presales Consultant | Distinguished Engineer
    Precisely | Trust in Data
    ------------------------------



  • 3.  RE: Python Raster Clip error

    Posted 03-03-2023 13:22

    Thank you, Peter, the code now works!

    It would be most helpful to be able to read documentation specific to mapinfo modules and functions written in python. Are those types of docs available (my searches indicate no). I do have Python Quick Start loaded in mapinfo which helps a little. It is inefficient and quite cumbersome to try to dir() and help() my way to figuring things out.

    I really appreciate your helping me - Kathy



    ------------------------------
    Kathy Gillis
    AT&T
    SAN RAMON OR
    ------------------------------

    Original Message


  • 4.  RE: Python Raster Clip error

    Employee
    Posted 03-06-2023 03:42

    Hi Kathy

    You need to look for the Extensibility Reference Help file.

    From MapInfo Pro, you can find it by right-clicking in the Python Console and from the Help dropdown in the SQL Window:

    And for the MapInfo Pro Raster SDK, you can find a help file in the Raster\Documentation\API folder in the MapInfo Pro installation folder:
    This is also where you find a number of MapInfo Pro Raster samples (.NET not Python).


    ------------------------------
    Peter Horsbøll Møller
    Principal Presales Consultant | Distinguished Engineer
    Precisely | Trust in Data
    ------------------------------

    Original Message


  • 5.  RE: Python Raster Clip error

    Posted 03-06-2023 11:22

    Thank you, Peter, I appreciate your help - Kathy



    ------------------------------
    Kathy Gillis
    AT&T
    SAN RAMON OR
    ------------------------------

    Original Message