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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=egm2@jps.net href="mailto:egm2@jps.net">Eric G. Miller</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=GRASSLIST@baylor.edu
href="mailto:GRASSLIST@baylor.edu">GRASSLIST@baylor.edu</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, March 28, 2003 10:53
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [GRASSLIST:5906] Re: Scanned
images - how to assign coordinates for the first time</DIV>
<DIV><BR></DIV>
<DIV>On Fri, Mar 28, 2003 at 10:29:55PM -0800, John Doucette wrote:<BR>> I
seem to be having a conceptual problem with Grass and images. I<BR>>
would like to bring a scanned image into Grass and to assign<BR>>
coordinates to the image and then probably save it as a geotiff or<BR>>
geojpg. I thought i.rectify would be the ticket but after trying
to<BR>> do so and reading the manual pages I now think that i.rectify is
only<BR>> for use with an already rectified image and actually seems to be
used<BR>> to transform an already rectified image rather than to
assign<BR>> coordinate for the first time. So how does one put
coordinates on a<BR>> scanned image the first time? Can this be done
in Grass or do I have<BR>> to go out and get a multi-hundred/thousand
dollar program to assign<BR>> coordinates to a scanned map that doesn't
have coordinates assigned<BR>> yet?<BR><BR>i.rectify is exactly the
tool. There's an old image processing tutorial<BR>on the GRASS websites
that is still mostly accurate regarding various<BR>procedures. Actually
locating the registration points is handled by<BR>other tools (i.vpoints,
etc...). Registration points are merely a cross<BR>walk (Pixel(X,Y) maps
to Coordinate(E,N)) and can be written in a text<BR>editor!</DIV>
<DIV> </DIV>
<DIV><FONT size=2>A what? How?</FONT><BR><BR>-- <BR>echo
">gra.fcw@2ztr< eryyvZ .T pveR" | rot13 |
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