Am 21.01.2013 10:28, schrieb Pietro Rossin:
Hi I need some help on using this plugin because It hasn't any howto on its usage, or may be I didn't find it. I want to use a NTv2 grid for the reprojection between Monte Mario / Italy zone 2 (3004) and Wgs84 (4326). My ntv2 is made by two files .asc and .gsb. The .asc is an ascii file and inside it I can see SYSTEM_FROME40 - I think this is the From crs SYSTEM_TWGS84 - I think this is the To crs
Well, thats actually not used. The plugin works with the binary version.
So it's intended to reproject from Rome 40 to WGS84, ok. When I want to setup a new transformation the plugin asks for a Transformation name, that is my preferred name, ok. System_from should be SYSTEM_FROME40, right? What should I use Monte Mario (Rome) 4806 or Monte Mario / Italy zone 2 (3004)?
If your data is projected (that is in meters), use 3004. 4806 is in degrees.
System_To will be WGS84 (4326). Then, what does it mean with Custom CRSs (CRS A and B name)? Are these only custom names used to describe Rome40 and WGS84 in my case?
You don't have to enter anything, the plugin creates a new CRS for you.
They appear under custom Coordinate systems, can I use whatever name I prefer? Then 100000 and 100001 are custom EPSG automatically generated by TT plugin? Then there are two keys on the bottom left part of the plugin window that are Apply CRS A -> B (direct) and Apply CRS A<- B (inverse), the first is to reproject from Rome40 to wgs84 an the second the opposite?
I have not found any sense in those buttons yet. A bit of documentation good be good ;-)
Greetings, André Joost _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
