update georectifyer tutorial

[hamish]

Hi,

just trying to help someone with the georectifyer tool, and it seems we don't have a good step by step tutorial for it explaining the workflow.

raw image + GPS points of features in the image --> projected image in local UTM.

any copyright-free aerial photos of North Carolina about?

here's the old page for tcl/tk:

​http://grasswiki.osgeo.org/wiki/Georeferencing

(still valid if you tell g.gui to use tcl/tk..)

note the old i.points workflow was push from simple x,y to target location, and the new wxGUI way is to pull from simple x,y into projected location. -- can we skip the import to simple x,y and work with unreferenced jpegs directly?

see also ​http://grass.osgeo.org/grass64/manuals/wxGUI.GCP_Manager.html

thanks, Hamish

[dnewcomb]

Hamish, What flavor of NC aerial photos do you want? For the Raleigh area, I have 4 band Summer 2012 1 meter resolution ( UTM Zone 17N NAD83 ) aerial photos,

or 6 inch resolution RGB jpeg-compressed tiffs Winter( Jan- Feb) 2010 (North Carolina State Plane Feet NAD83) (from ​http://data.nconemap.com/geoportal/catalog/raster/download.page ) I can possibly contact the State of NC to get the uncompressed versions from their archives.

How many photos? I assume that the photos would need to be from the same area as the other NC data ?

[neteler]

To get this imagery would be great in order to create a ​https://trac.osgeo.org/grass/wiki/SampleDataset#SpecializedMapsets

[neteler]

ping :)