I used Cartosat for extracting DEM but the final DEM has inverted heights i.e ridge appears as valley and vice versa. That is probably due to interchange of left and right stereoscopic image pair in the input dialog box. It took 4 hours for my PC to process the DEM. So i wanted to know if there is any solution to fix this without going through the whole extraction process. Also i wanted to register the DEM heights from float values to meters. I am beginner so please bear with me.