# How to calculate the percentage of distribution in each polygon?

I have binary map for disease suitable area and I want to calculate the percentage using pixel count in each polygon how can I do that?

I use zonal histogram and do have frequency for each polygon is there is way to use this values to calculate the percentage in each polygon?

• What program are you using? – Jake Nov 22 '13 at 10:08
• I use Arc.GIS 10 – Basma Sheta Nov 22 '13 at 10:15
• You need to provide more deteails. What do you mean by binary map? what do you mean by 'calculate the percentage'? – Devdatta Tengshe Nov 22 '13 at 10:34
• I guess that by 'Binary Map' - @Basma Sheta meant a raster that containt pixel information for either it is suitable for disease or not. Calculating the percentage can be performed by summerize the area of the pixels for each type (suitable or not) in each polygon (count the pixels in each polygon and multiple the count with the area of each pixel using cell size), than divide it by polyogn area. Don't know arc functions to perform it though. – dof1985 Nov 22 '13 at 10:38
• Yes this is really what I want to do. I use zonal histogram but it calculate the frequency in each polygon (suitable and unsuitable). I don't know how to calculate this count for each polygon. – Basma Sheta Nov 22 '13 at 18:45