topic How to calculate zonal statistics on a multiband raster? in Data Management Questions https://community.esri.com/t5/data-management-questions/how-to-calculate-zonal-statistics-on-a-multiband/m-p/613352#M34594 <HTML><HEAD></HEAD><BODY><SPAN>Hello!</SPAN><BR /><BR /><SPAN>I am currently working with a 3-band TIFF image of that uses color intensities to reflect flood levels (the image uses a color scale with 13 discrete classes of flood depths).&nbsp; I would like to assign these 13 classes to the raster within ArcMap.&nbsp; However, this appears to be an issue with a 3-band TIFF image.</SPAN><BR /><BR /><SPAN>I also have a shapefile with census tract regions overlaid on this image.&nbsp; I would like to calculate mode, maximum, and mean (if possible) flood level statistics within each census tract.&nbsp; This seems like a task for Zonal Statistics in the Spatial Analyst toolbar, but this only works with single-band rasters.&nbsp; </SPAN><BR /><BR /><SPAN>Thus, I have two primary issues: first, how would I go about classifying values according to color within the raster?&nbsp; Second, how would I then use this classification to calculate statistics within zones?</SPAN></BODY></HTML> Mon, 04 Jul 2011 16:32:36 GMT CJDarvin 2011-07-04T16:32:36Z How to calculate zonal statistics on a multiband raster? https://community.esri.com/t5/data-management-questions/how-to-calculate-zonal-statistics-on-a-multiband/m-p/613352#M34594 <HTML><HEAD></HEAD><BODY><SPAN>Hello!</SPAN><BR /><BR /><SPAN>I am currently working with a 3-band TIFF image of that uses color intensities to reflect flood levels (the image uses a color scale with 13 discrete classes of flood depths).&nbsp; I would like to assign these 13 classes to the raster within ArcMap.&nbsp; However, this appears to be an issue with a 3-band TIFF image.</SPAN><BR /><BR /><SPAN>I also have a shapefile with census tract regions overlaid on this image.&nbsp; I would like to calculate mode, maximum, and mean (if possible) flood level statistics within each census tract.&nbsp; This seems like a task for Zonal Statistics in the Spatial Analyst toolbar, but this only works with single-band rasters.&nbsp; </SPAN><BR /><BR /><SPAN>Thus, I have two primary issues: first, how would I go about classifying values according to color within the raster?&nbsp; Second, how would I then use this classification to calculate statistics within zones?</SPAN></BODY></HTML> Mon, 04 Jul 2011 16:32:36 GMT https://community.esri.com/t5/data-management-questions/how-to-calculate-zonal-statistics-on-a-multiband/m-p/613352#M34594 CJDarvin 2011-07-04T16:32:36Z