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Raster calculater gives wrong result

AntonKirillovichMalyshev

Hi, I'm trying to calculate Canopy Height Model and values of result raster doesn't make sense. DSM (min value 203, max value 628 cell size x,y= 10) - DTM (min value 203, max value 596 cell size x,y= 10) = CHM (min -46 max 90 cell size x,y= 10). Any ideas how to fix it?

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AntonKirillovichMalyshev

I found that the problem was caused by some high objects on DTM (some buildings became a part of the relief)

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DavidPike

Are the DSM and DTM from the same sensor and temporal resolution? Check the areas of negative values to see if anything is obvious. Also ensure a snap raster has been applied.

AntonKirillovichMalyshev

all settings seem correct, I tried to change the expression to sum (DSM+DTM) and it counts correctly, but with minus it's -46 and 90

AntonKirillovichMalyshev

I found that the problem was caused by some high objects on DTM (some buildings became a part of the relief)

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