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Take a look at the attached tool. It will allow you to do zonal statistics as table on overlapping polygons. you can add this tool directly to ArcToolbox. Jamie Thats all I get from this tool. <type 'exceptions.RuntimeError'>: Row: Field FID does not exist Failed to execute (StatisticsForOverlappingZones)
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10-09-2012
01:27 AM
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Hi Patrick No, I do not think that this is the problem. My extend size has no irregular floating point numbers. I can create that error also with a very simple Polygon Grid (all my polygons are squares and exactly 100x100 Meters) I tried some more "Polygon to Raster" conversions today and learned the following: I always set the ENVIROMENT - Processing EXTEND - to an existing Raster files extend (I want my new pixels exactly at the same position): Extend of original raster file is: TOP 428499,809500 BOTTOM 305499,809500 LEFT 153499,885400 RIGHT 372499,885400 You see the y resolution is 428499,809500 MINUS 305499,809500 = 123000.00 Meters But when I create a RASTER and save it in some normal FOLDER the EXTEND will be set to: TOP 428499 BOTTOM 305499 LEFT 153499 RIGHT 372499 I loose 0,8... Meters and the new Grid does not match the old one. BUT - here comes the surprise (!) - When I create the RASTER file in my FileGeodatabase it creates not a GRID, it creates a FGDBR (FileGEoDatabaseRaster) and to my surprise it sets the extend to the exact input values. It is either a bug or a feature I do not understand. But Polygon to Raster only works perfect when you save the output in the same gdb file.
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03-29-2012
03:19 AM
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Hi Using the "Polygon to Raster" tool it will either create a discrete (1,2,3,4) or continuous (1.5, 1.7 , 1.8) rasterfile. Fine. But why is the EXTEND of this raster also either discrete or continuous? Thats a bug IMO. The extend has nothing to do with the values in my raster file and should not have an influence on the coordinate system and zero-point. Try it for yourself, create a raster out of square polygons where the extend of the layers source is not a discrete number. The results is that "Polygon to Raster" will cut everything after the decimal point...48600,8324 meters will become 48600 meters.
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03-27-2012
05:22 AM
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Hello there I have the same problem, but could not solve it for 100% I have a grid of points, they build squares but the whole matrix is rotated for about 5 degrees (I am not allowed to change that) I need to make squares around those points. What I used was the BUFFER Wizard to create a circle polygon and then I used the Feature envelope to polygon tool to create squares out of those circles. The result was a matrix of squares but they are not rotated at 5 degrees, so they build a step and a small part on every edge is blank. See this image to understand it better. http://oi41.tinypic.com/3481thw.jpg Any help?
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03-01-2012
03:59 AM
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Hello I am Using Arcmap 10.0 I simply use the ArcToolBox->Data-Management -> Raster -> Clip Function to Clip a DEM File with my shapefile polygons. Before I did that, I RESAMPLED the DEM once, to have a higher resolution and get more accurate areas (original dem has only 10x10m resolution, now it has a resolution cellsize of 0,2x0,2 meters) First the results look fine, but see for yourself. It seems as if the CLIP function seems to add a few pixels on every upper right corner of a polygon. Ok, thats only a few pixels, but it is wrong. It really gets worse if the polygons are very small and have many edges. (horror.jpg) I did not change any settings with the CLIP function. I only use the 2 input files, and check the box "Use Input features for clipping..." Any help would be appreciated.
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04-24-2011
08:53 AM
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