[GRASS-dev] [GRASS GIS] #2206: update georectifyer tutorial

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1

#2206: update georectifyer tutorial
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Reporter: hamish | Owner: grass-dev@…
     Type: task | Status: new
Priority: normal | Milestone: Website
Component: Docs | Version: 6.4.3
Keywords: georectifier | Platform: All
      Cpu: Unspecified |
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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

--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2206&gt;
GRASS GIS <http://grass.osgeo.org>

2

#2206: update georectifyer tutorial
--------------------------+-------------------------------------------------
Reporter: hamish | Owner: grass-dev@…
     Type: task | Status: new
Priority: normal | Milestone: Website
Component: Docs | Version: 6.4.3
Keywords: georectifier | Platform: All
      Cpu: Unspecified |
--------------------------+-------------------------------------------------

Comment(by 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 ?

--
Ticket URL: <http://trac.osgeo.org/grass/ticket/2206#comment:1&gt;
GRASS GIS <http://grass.osgeo.org>

3

#2206: update georectifyer tutorial
--------------------------+--------------------------
  Reporter: hamish | Owner: grass-dev@…
      Type: task | Status: new
  Priority: normal | Milestone: Website
Component: Docs | Version: 6.4.3
Resolution: | Keywords: georectifier
       CPU: Unspecified | Platform: All
--------------------------+--------------------------

Comment (by neteler):

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

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2206#comment:2&gt;
GRASS GIS <http://grass.osgeo.org>