I did an supervised classification for for this watershed. The attribute table doesn't have the count for total number of cell for each classification. I've created a field titled 'Count' with type 'Long', but I haven't figured out how to populate it. The photo is just to better illustrate what I'm trying to do.

-Using ArcGIS 10.1

-Supervised classification done on Landsat7 images that had multiple bands. I don't know why the table has a red, green, and blue column

Raster properties for the supervised classification imageAttribute table I'm working with

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    How is it that the attribute table showing Red/Green/Blue values, when the output of classification approaches is a single band data.? – Akhil Jan 9 '15 at 3:50
  • In which software have u done your classification? – SIslam Jan 9 '15 at 6:14
  • If this was an Integer grid you would have a Value and Count column. I fear you are not telling us the whole story as pointed out by @Akhil an @msi_g! – Hornbydd Jan 9 '15 at 10:05
  • Normally ERDAS generates these RGB colums. If i got you workaround is get the area for each class and divide this area by cell size(spatial resolution)-this is the number of cell for that class. – SIslam Jan 9 '15 at 12:00
  • @msi_g as stated in the question I'm using ArcGIS 10.1. I'm trying to find the area of the different classes. I just asked about the cell number because I thought that was the only way to find the area for each class. If you know of another way of getting the area of the classes I'd much appreciate it. – Hgotwald Jan 9 '15 at 16:18

I can't explain why your original raster does not have a populated count field - I thought it appeared by default for integer rasters.

In any case, you can get those values by:

  1. Create a new integer raster, from your original, using Int. This will create a copy of the raster with Value and Count fields.
  2. Join the new raster back to the original raster based on the Value fields in each.
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