Hi @kreid, by using 3 cell radius in ArcGIS, I am assuming you were working with a circle? Have you tried with the set of parameters as in the screenshot below? I am creating a 7x7 window (three additional cells either side of the central cell) and assign the weight of the corners to zeros as an approximation of the shape.
You are very welcome to share a small set of sample data, if this still doesn't work for you.
Hi @alyssaatsafe. Yes, I was working with a circle.
I just tried the parameters you suggested and the results aren't correct when comparing to my dataset generated in ArcGIS. Red contours were generated in Arc, the purple in FME with the suggested settings above.
The contours below might be a bit difficult to look at but the red contours were generated in Arc. The blue, generated in FME with the settings you suggested above except that I set the divisor to 1 and the green, FME with a similar 5x5 grid (divisor set to 1).
My bare earth las file's attached. I'm running a Raster DEM Generator with the settings below, then the Raster Convolver and finally the Contour Generator with an interval of 1.
be.zip
Your help is much appreciated!
Hi @kreid, thank you for sharing you data and screenshots. They are very helpful.
I realized I made a mistake in the original parameter settings. Size of kernel is 7x7 still and weights remain the same. Would you like to try with Divisor as Sum of Kernel Weights and Operation as Sum (instead of Mean)? This way it takes the sum of all cell values with weight of 1, then it is divided by the total number of 1's. Sorry for the confusion.
I've tested the above and compared to the contour lines generated from raster created with ArcGIS Focal Statistics. They appear much closer. Some differences still exist (mostly along the edges of the raster and some curves), but I've confirmed with the differences in the raster values, which are around +/- 0.005 in elevation.
Hope this works for you!
Hi @kreid, thank you for sharing you data and screenshots. They are very helpful.
I realized I made a mistake in the original parameter settings. Size of kernel is 7x7 still and weights remain the same. Would you like to try with Divisor as Sum of Kernel Weights and Operation as Sum (instead of Mean)? This way it takes the sum of all cell values with weight of 1, then it is divided by the total number of 1's. Sorry for the confusion.
I've tested the above and compared to the contour lines generated from raster created with ArcGIS Focal Statistics. They appear much closer. Some differences still exist (mostly along the edges of the raster and some curves), but I've confirmed with the differences in the raster values, which are around +/- 0.005 in elevation.
Hope this works for you!
This method worked great. I really appreciate your help, @alyssaatsafe and thank you!!
