I need to be able to replicate with ogr2ogr a coordinate transformation that was executed in ArcGIS for Desktop.
Both ArcGIS and ogr2ogr are based on EPSG standard definition.
There's not only one way to transform data from a reference system A to a reference system B, but many transformations are possible (T1, T2 ... Tn).
After a lot of reading i understood that EPSG codes define, among many other things, CRS (coordinate reference systems, A and B in the previous example), and possible transformation between them (T1...Tn).
When in gis one performs a coordinate transformation ArcGIS prompts the user with the choice of a transformation. On the other side ogr2ogr simply works specifying the source and destination CRS.
two questions then arise:
- what kind of transformation does ogr2ogr performs? is it still based on the transformation defined within the epsg standard?
- Is it possible to force ogr2ogr to use a transformation specified via an epsg code?
please keep in mind that my goal is to replicate a transformation executed in gis (thus identified by an epsg code), with a call to ogr2ogr.