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I have a set of temporal images of a given State with 23 districts.

When I used ArcGIS for Desktop to generate zonal statistics using the vector file of the State, the pixel counts were tabulated for these 23 districts for different periods.

I am confused to note that the pixel counts were varying between different times.

Can anybody solve my problem?

I can do it in QGIS also if the method is suggested.

  • What file format are the temporal images? How were the data captured? How different are the pixel counts? Depending on format, I'm not surprised that pixel counts may be different. – Fezter Aug 10 '15 at 6:17
  • Basically the file format is TIFF and the sensor is MODIS-Terra. My interest is to study crop stress in a given area over period of time, for instance from 2000 to 2014. I like to calculate the percentage of pixels in various stress classes. However, I found the pixels counts were varying causing a worry. – DVKNRao Aug 10 '15 at 6:40
  • If you have access to ArcGIS 10.1, you can use the tool Tabulate Intersection. If not (which seems to be the case), the pixel count is a good way to go. Could it be that the data from different times have different resolution? – Nahas Aug 11 '15 at 15:47

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