I'm a GIS novice, and am struggling to understand how to drive proj4 to accomplish what seems like a simple thing. I've googled for a couple of days, but everything I find seems to presuppose quite advanced knowledge, and leaves many things unsaid. Stack overflow couldn't clear it up for me, either..
I have a conversion between UTM easting/northing and lat/long to do in both directions. Once I get this working, I'll add some different projections/datums.
I'm working on my recently acquired knowledge/assumptions:
- This conversion will require a datum translation, because WGS84 (standard datum for UTM) has it's prime meridian approximately 100m east of Greenwich (where longitude is zero).
- I don't need to worry about ellipsoids, because the lat/long are geographic coordinates, rather than projected ones.
- I can either start the conversions using one string (as used in the command-line instantiation), or can pre-assemble a source and destination object, and call
Another issue is that if I call the code directly, while I've found the
projUV datatype - I can't find the corresponding UTM version.
Could someone please get me started with the format of the string(s) of either method required?
Say conversion from zone 56 499451mE 6960921mS to lat/long as an example?
Many, many thanks.