I am using ArcGis 10.3.
I am trying to compute area weighted averages for polygons in a shapefile using values in a single band raster data set.
The approach I am taking is that I am converting the Raster (with cell size 0.1*0.1) to Polygons. Then, I intend to use intersect analysis and calculate area to get the intersection area of a square/pixel with a given polygon and the total area of each polygon (by square I mean the resulting square polygons when I have converted raster to polygons).
Using this information I can then compute area weighted averages.
I do have some concerns though:
1) When I convert Raster to Polygon, not all the resulting square polygons get a unique FID (so for example, multiple squares have the same FID but the identify tool shows these to be separate entities). The data set lacks a unique ID. I thought that arc gis should be generating this automatically. How do I resolve this issue?
2) Is there a simpler way to do this entire task? I looked through past questions and none had a good suggestion. It seems as though zonal statistics cannot compute an area weighted mean.
أكثر...
I am trying to compute area weighted averages for polygons in a shapefile using values in a single band raster data set.
The approach I am taking is that I am converting the Raster (with cell size 0.1*0.1) to Polygons. Then, I intend to use intersect analysis and calculate area to get the intersection area of a square/pixel with a given polygon and the total area of each polygon (by square I mean the resulting square polygons when I have converted raster to polygons).
Using this information I can then compute area weighted averages.
I do have some concerns though:
1) When I convert Raster to Polygon, not all the resulting square polygons get a unique FID (so for example, multiple squares have the same FID but the identify tool shows these to be separate entities). The data set lacks a unique ID. I thought that arc gis should be generating this automatically. How do I resolve this issue?
2) Is there a simpler way to do this entire task? I looked through past questions and none had a good suggestion. It seems as though zonal statistics cannot compute an area weighted mean.
أكثر...