Point To Raster Tool

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06-05-2014 07:35 AM
MichaelBlom
New Contributor III
Hello,

I am using the point to raster tool, summing by "theCalcField", and using a cell size of .85 degrees.  So I expect a full blocky-style raster. 

Why then does the tool create a raster as though each cell is considering values from outside it's own cell (as per many other spatial analyst tools)?

This is my command.
arcpy.PointToRaster_conversion(LOCATIONS, theCalcField, RASTER_LAYER, "SUM", "NONE", "0.85")

And an image of the raster:

[ATTACH=CONFIG]34391[/ATTACH]
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JimCousins
MVP Regular Contributor
Perhaps your layer display is using bilinear interpolation?

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JimCousins
MVP Regular Contributor
At .85 degrees, this should be 2 or 3 cells tall, correct? So the cellsize is not being set correctly. Is the input point data in geographic coordinate system?
Regards,
Jim
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MichaelBlom
New Contributor III
Hmmm,

I think a degree at the equator should be approximately 69 miles (111 kilometers)

so, .85 of a degree maybe around 100km... and where in my image it is blocky (in the bottom left), this block size is about 100km, so that is the expected cell size.

the whole raster should be cells of this size, I would think, according to how point to raster works.
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JimCousins
MVP Regular Contributor
Perhaps your layer display is using bilinear interpolation?
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MichaelBlom
New Contributor III
Hi Jim,

Nice one! yes, it was due to the symbology that had been applied to the raster.

Thanks very much!
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