ArcMap Convert Data from WGS84 to SVY21 TM (Singapore SLA)

1. First create a custom Geographic Transformation as following:


You can select the input GCS and output GCS from ESRI projection list:

GCS => World => WGS 1984

PCS => National Grids => Malaysia and Singapore => SVY21_Singapore_TM

2. Project Data: select From_WGS84_to_SVY21 for the last option(just now created)



3. It’s a reverse step to do the SVY21 to WGS 1984 conversion.