While performing raster calculator operation in ArcGIS for Advanced Vegetation Index ( in calculating forest canopy density), the results show only 2 values i.e high (1) and low ( 0), instead of a range of values.The low values considered are of that of the background no-data values.
What could be the possible problem in the operation ?
I am using the formula :
AVI = (("ref5"+1) * (256-"ref4") * ("ref5"-"ref4")) ^ (1/3)
where ref5, ref4 are bands 5, 4 corresponding to Landsat 8 image, converted into TOA reflectance values.