I have traditionally used the "Mosaic to New Raster" function to merge Digital Elevation Models (DEM) rasters. I realised that once merged, the values tend to be slightly different compared to the inputs (e.g. two input rasters with elevations between 177-6851 and 133-6594 producing an output raster with elevation values between 93 and 6868). I have merged them in several different ways, but I always find a difference between input and output values. I also tried to use other functions but have not been able to find another one that does the similar task. Could someone give me an idea of how to correct this or at least understand why does it happens and what does it mean. Also, if someone knows another function that does the similar job I would appreciate you could let me know the name.
Hope someone can help me with this
Thank you very much in advance