histogram — A composite type used as record output of the ST_Histogram and ST_ApproxHistogram functions.
A composite type used as record outputs of the ST_Histogram
ST_ApproxHistogram functions. Note that depending on
exclude_nodata_value of function, may or may not contain nodata pixels.
Each histogram record in results corresponds to a bin for a selected raster band.
minimum pixel value in this bin
Maximum pixel value in this bin.
count of pixels in this bin.
Percent of pixels of the overall population in this bin.