Matt wrote: > I'm using this to figure out how to georeference. The tutorials / wiki > are useful but for someone new to GRASS there is a little detail lacking > in the documentation.
anyone can edit the wiki, improve as necessary. for the website tutorials not yet ported to the wiki or main module help pages, post a patch to the bug tracker. there is no real documentation team here, only contributing and appreciative users. > I think my problem at the moment is that I've got a theoretical > understanding of how groups and locations work but applying this > to the menu structure/workflow within grass is another thing. see the "quick intro" help pages: http://grass.osgeo.org/grass64/manuals/html64_user/index.html beginning with "How to start with GRASS" and on the wiki: http://grass.osgeo.org/wiki/Gis_Concepts which leads to: http://grass.osgeo.org/wiki/Gis_Concepts#How_a_GRASS_project_is_organized > Locations: basically a place in the grass database with an area (ie > region) and a projection. right. > Data within the location is stored in groups. no, locs contain mapsets. mapsets are just a collection of maps, perhaps grouped by time, owner, data type, or local area of interest. There is always a PERMANENT mapset which contains projection info for the location and maps viewable from all mapsets. Typically you'll work in another mapset from that. Groups contain a series of raster maps covering the same area (e.g. red, green, and blue bands of the same satellite image) > ie, one raster split into RGB would be a group, yes, r.in.gdal often makes you a group if it is importing multiband data. > an imported shapefile or possibly set of shapefiles would be another > group. no, they just live in the mapset as a bunch of vector maps. > Locations need to be created when starting grass. you need to have one to work with. > Do I need to have a group created before I import data or, is there a > group created when I import data? r.in.gdal creates groups, or you can use i.group to manage them. > I can import vector data easily enough and I'm not prompted to create a > group usually, however I am having trouble creating a group using the > i.group tool. > If I start it form within the georectify > tool it won't accept any input until I close the > georectify window and it usually crashes. typical suggestion then is to try and see if it works from the CLI, > The man page doesn't have a cli example on how to create a > group within the location (that I can remember, I'm away from my grass > pc today). look in the i.group help page, hopefully the georeferencer help page links to that. Hamish _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
