Geographic Information Systems Asked on January 13, 2021
I’m changing raster layers in ArcMap from WGS84 to BTM (Bangladesh Transverse Mercator). I first set my data frame to be in BTM
[BTM
Projection: Transverse_Mercator
False_Easting: 500000.0
False_Northing: -2000000000.0
Central_Meridian: 90.0
Scale_Factor: 0.9996
Latitude_Of_Origin: 0.0
Linear Unit: Meter (1.0)]
When I add the layers I’m asked to do a datum transformation apparently. I found two transformation datum which differ in ΔZ. Which one is accurate?
First one:
ΔX -283.729m
ΔY -735.942m
ΔZ -261.143m
Second:
ΔX -283.729m
ΔY -735.942m
ΔZ -161.143m
When I've processed data in Bangladesh and it has been supplied to me in BTM (Bangladesh Transverse Mercator) it sometimes comes with the datum set to GCS_Everest_Bangladesh. I have found if I set the datum to be GCS_Gulshan_303 I generally get better alignment.
Answered by Hornbydd on January 13, 2021
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