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Error when using arcpy.GenerateTessellation_management in ArcGIS Pro 2.6 with arcpy Python

Romero_Dario

sdf = pd.DataFrame.spatial.from_featureclass(os.path.join(gdb_file, gdb_layers[1]))
sdf.head()
# Describe the input feature and extract the extent
description = arcpy.Describe(os.path.join(gdb_file, gdb_layers[1]))
extent = description.extent
tessellation_extent = sdf.spatial.full_extent
spatial_ref = extent.spatialReference

I am trying to generate a Feature Class with hexagons by using the method GenerateTessellation_management with this code:

arcpy.GenerateTessellation_management(Output_Feature_Class=gdb_file+r"\hex_tessellation", 
                                      Extent=tessellation_extent, 
                                      Shape_Type="HEXAGON",
                                      Size="1000000 Square Foot",
                                      Spatial_Reference=spatial_ref
                                     )

And I am getting this error:

I am following the documentation as per the following website:

https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/generatetesellation.htm

Any idea why this is not working?

Thanks in advanced.

Dario

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danretired

0.1 degrees squared would be the area of each hexagon, not 5 degrees... that might be your full extent.

Just try something much smaller and check the coordinate system you want to use eg GCS WGS84 if you must work in degrees

Romero_Dario

... another idea would be to convert the layer to an Equal-area projection, run the procedure. And see what happen.

Romero_Dario

I am working on a global scale. Ideally the hexagon(s) should be 0.1 degrees on the side. Although I think the problem might be in the spatial reference. Don't you think.

Romero_Dario

I've changed it to be the area of equal size hexagons where the formula for the area is:

there I added this equation to have hexagon of 5 degrees each, consequently:

area = "{size} Square{unit}s".format(size=((3.0*math.sqrt(3.0))/2.0)*(a**2.0), unit=u)
area
'64.9519052838329 SquareDegrees'
... then the result is again the same error. Can this function deal with geographical coordinates rather than linear (like UTM)?
# Use the extent's spatial reference to project the output
spatial_ref = extent.spatialReference
spatial_ref

danretired

That is a horrendously large area and I suspect a reason that you might be having issues

Romero_Dario

Thanks for your reply.

Actually the Feature Class in on a shape that is on Degrees. I might use the area as:

w = extent.width
h = extent.height
u = extent.spatialReference.angularUnitName
w, h, u
(359.999999902, 179.491346668, 'Degree')
area = "{size} Square{unit}s".format(size=w/3 * h/3, unit=u)
area
'7179.653864765539 SquareDegrees'

but got the same error. Do you have any other suggestion.

Thanks.

danretired

from here

Generate Tessellation (Data Management)—ArcGIS Pro | Documentation

w = extent.width
h = extent.height
u = extent.spatialReference.linearUnitName
area = "{size} Square{unit}s".format(size=w/3 * h/3, unit=u)

have you confirmed setting the area unit? I looks like a different configuration is expected than what you have shown

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