Histogram of a raster map   

A histogram is a special object which lists frequency information on values, classes or IDs in a map. A raster histogram lists the number of pixels, the percentages and the areas per value, class or ID in the raster map. If the input raster map uses a value domain, also cumulative number of pixels and cumulative percentages are calculated.

In a histogram window, the histogram is presented as a table and as a graph. For Value raster maps, summary information, such as mean, standard deviation, and percentage intervals, is available in the histogram window as well as in the Properties of the histogram.

A raster histogram is obtained by performing the Histogram operation on a raster map. For value raster maps that are stored using 1 or 2 bytes per pixel and of which no histogram is available yet, a histogram is automatically calculated just before such a value map is displayed.

With the Histogram operation, you can also calculate histograms of polygon, segment and point maps.