I'm trying to find the sum of all raster values unweighted, that touch my polygon layer.
In the picture I've below that would give me a sum of 7.4, instead it calculates it as 6.55 because the top left raser value is not added to the selected polygons sum. I've read somewhere that Zonal Statistics uses the center of either raster or vector layer to determine if it is added. I was wondering if there is a way around this.
This is a very large dataset 1.8 gigabyte in a 1.6 x 1.6 m grid covering a whole municipality. Converting everything to vectors would i believe is nearly impossible and using a buffer would probably get false results. The polygon layer represents bluespots with water, and the purpose is to get the sum of the rasters onto the polygon, without weighing the sum. The polygons differ a lot in size, from few cells to hundreds of cells.
I have access to Spatial Analyst, 3D Analyst, and ArcGIS 10.7 Advanced Desktop license.
Any suggestions for an alternativ approach, or way around how Zonal Statistics work?