2

I have a Landsat footprint polygon shapefile that I simply want to create a 6 x 6 fishnet on. I thought this would be simple, but every time I run the tool I get a fishnet output that extends longer than the original footprint and is shorter in height. I think the problem may stem from the fact that the footprint is slanted and the y-axis may be a different angle than the x-axis.

I used Feature Vertices to Points and then Add XY Coordinates to get the exact coordinates of the footprint polygon's corners. Then within the Fishnet tool, I used the footprint's extent as the 'Template Extent', the bottom left corner as the 'Origin Coordinate', the top left corner as the 'Y-Axis Coordinate', and the top right corner as the 'Opposite corner of Fishnet.'

Coordinate system is WGS_1984_UTM_Zone_18S.

Any ideas for how I can fix this and generate a properly placed fishnet?

Here's the strange looking fishnet output:

Fishnet

And here are the parameters I passed into the fishnet tool, along with the proper corner coordinates in the top left of the image (Point_X and Point_Y):

Fishnet tool screenshot

  • An easier way to get the extents of the polygon would be to open properties -> source. Have you tried flipping the coordinates around to see if maybe x was inputted into y and vice versa? – Paul Jul 16 '13 at 14:52
  • Maybe theres a coordinate system error. Try checking whether the fishnet feature class has the same CRS as your landsat data and the same as the whole data frame. – til_b Jul 16 '13 at 14:56
  • Thanks for the responses. The Coordinate Systems all match up. I'll try switching some of the XY coordinates and see if that's the fix. – rdg918 Jul 16 '13 at 16:01
  • Can you use Copy Python Snippet in your Geoprocessing | Results window to show us what parameters you passed to CreateFishnet? Are you expecting square cells in your fishnet and/or what size should they be? – PolyGeo Jul 16 '13 at 20:12
  • 1
    Does the fishnet layer have a defined coordinate system? And if not, could the data frame not be in the same one? – mkennedy Jul 16 '13 at 20:46
0

As a comment you provided a line of ArcPy code that I just tested using:

import arcpy

arcpy.CreateFishnet_management("C:/Temp/test.shp","223122.902847 4244274.58422","266744.967575 4410255.40647","0","0","6","6","447614.673105 4372719.14612","LABELS","wrs_dec_va_proj15033","POLYLINE")

This reported an error:

Traceback (most recent call last):
  File "C:\Temp\test.py", line 4, in <module>
    arcpy.CreateFishnet_management("C:/Temp/test.shp","223122.902847 4244274.58422","266744.967575 4410255.40647","0","0","6","6","447614.673105 4372719.14612","LABELS","wrs_dec_va_proj15033","POLYLINE")
  File "C:\Program Files (x86)\ArcGIS\Desktop10.4\ArcPy\arcpy\management.py", line 15397, in CreateFishnet
    raise e
ExecuteError: ERROR 000622: Failed to execute (Create Fishnet). Parameters are not valid.
ERROR 000628: Cannot set input into parameter template.

I am reluctant to investigate this error because the code snippet does not seem to match the parameters that you have used in the picture of your tool dialog.

| improve this answer | |

Not the answer you're looking for? Browse other questions tagged or ask your own question.