I calculated zonal statistic in Arcgis to get max/min value of each LC types. Broadly, LC image include forest, grassland, waterbody etc. But output max value of zonal statistic function give me 0.972 on the waterbody, 0.9908 on grassland, 0.9976 on forest. I think it is not reliable. What is the reason on this? Actually NDVI image has been masked on waterbody. Original value of the NDVI image range from -0.03 to 0.9976. Do you guys have another suggestion for this?
Thanks a lot