Hi, I am trying to calculate index based built-up index (IBI) in ArcMap using raster calculator and getting strange values. I downloaded Landsat 8 data and using green, red, NIR and SWIR1 bands for the equation: IBI = (NDBI - (SAVI + MNDWI) / 2) / (NDBI + (SAVI + MNDWI) / 2) I followed the equations in this article to get all the indexes needed for IBI https://link.springer.com/article/10.1007%2Fs10708-020-10148-w My result values for IBI range from -3.10538e+07 to 2.53846e+07, which is rather strange. My NDBI values range from -0.64 to 0.66, SAVI from -0.33 to 1.47, MNDWI from -0.98 to 0.47. All these 3 rasters seem to correct. I can't really get my head around where the mistake is. Any suggestion? I would be really grateful for any help.
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