I am quite new to GIS and I have a question regarding projection transformations.
I am using GeoPandas to read a map in EPSG 6347 and I use the method to_crs
to convert it to EPSG 4326, as documented here.
As far as I understand, the ellipsoid and the datum are entirely specified in the EPSG:
EPSG | CRS | Datum | Ellipsoid |
---|---|---|---|
6347 | NAD83 | 2011 | GRS80 |
4326 | WSG84 | 1984 | WSG64 |
and therefore, I thought that there would only be one possible transformation.
The first answer to this question indicates that there are multiple transformations from NAD83 to WSG84. This is also explained in this link. Those transformations are named: NAD_1983_To_WSG_1984_1,…, NAD_1983_To_WSG_1984_8.
Which of those 8 transformations is used by GeoPandas when it converts from EPSG:6347 to EPSG:4326?
Best Answer
Proj version 8.1.1 finds only one conversion between those two codes: