I am from Sri Lanka. Northern Sri Lanka is in UTM Zone 44. If the data been collected in UTM Zone 44N and If I (or someone) convert it to Kandawala Sri Lankan Grid (Available in ArcGIS 10.1 as Projected Coordinate Systems -> National Grids -> Asia -> Kandawala Sri Lanka Grid) there seems to be shifting around 200 meters on the east. However if I use DNR GPS software from DNRGPS Application: Minnesota DNR load the shape file then if I set (from the DNR GPS) the file -> Set Projections -> Datum as Kandawala and Projection as Sri Lankan Grid only few meter difference which is acceptable. I have verfied this with 2 Garmin GPS one set to UTM Zone 44n and other set to Sri Lankan Grid . I shall be thankful if I can sort out the issue in ArcGIS.
Dear Dan Patterson,
No. The datum UTM Zone 44n is WGS84 while for Kandawala Sri Lankan Grid Datum is Kandawala. Geotrans software NGA: (U) MSP GEOTRANS 3.4 Geographic Translator (UNCLASSIFIED) also provide resonably accurate transformation.
Did you set a transformation (datum shift) under the cords tab in the data frame properties page?
You have a single geocentric transform available (ArcGIS v10.2) for WGS84 to/from Kandawala, dx, dy, dz parameters -97.0, 787.0, 86.0.
That will be the likely cause of your 200m shift.
Dear Neil Ayres,
Many thanks for the reply. You may have a look at the original gpx via https://onedrive.live.com/embed?cid=45B0A8A523ED0470&resid=45B0A8A523ED0470%21585&authkey=ADgKMvA2w_... file from the garmin etrex10 GPS (with GLONASS enabled) that can easily open dnr gps and save as a a arcgis shaefile from there.
I set the data frame properties to Kandawala Sri Lankan Grid
I have added the layer which was set at UTM Zone 44n with WGS 84datum.
When I added it gave Grographic Coordinate System Warning which is given below
I have clicked the Transformation
If I simply click Convert from GCS_WGS_1984 to GCS_Kandawla and click ok results around 200m shifting in the east as I mentioned via a screenshot above. However if I choose using (choices are sorted by suitability for the layer's extent) using geocentric transoformation geocentric transformation it works and the answer is quite close.
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