<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#ffffff">
<font face="Arial">Hi Richard,<br>
<br>
For me this is an exercise in eliminating my dependence on
Windows. In the past, I have done this by using MS Excel charts
with the image as the background of a chart displaying my GPS
plot. I set the X and Y (Longitude and Latitude) minimums and
maximums for the chart to match the image and then compare my GPS
trace with the underlying image. I want to do this with Linux and
as Open Office Spreadsheet does not allow me to use an image as a
background for a chart, I am looking for other (and better)
solutions.<br>
<br>
I am now looking at Quantum GIS and recognize it as a powerful
tool. I have loaded in my image, reading the manual and
struggling to find the "Raster Calculator" to which they refer in
the manual. It appears that I can set the Latitude and Longitude
bounds using the calculator. Still, I am running blind here but
trying to keep hold of my original goal of loading the image as an
underlay in JOSM to check my GPS trace.<br>
<br>
Thanks Richard,<br>
<br>
Peter<br>
</font>
<div class="moz-signature">
<!--div style="float:left; padding-right:0.3em">
<img src="http://www.facebook.com/album.php?aid=-3&id=729157512">
</div-->
<div style="font-size: 8pt;"> <br>
Peter Freeman<br>
180 Musgrave Place<br>
Salt Spring Island, V8K 1V5<br>
British Columbia, Canada<br>
(250) 653-4623<br>
<a class="moz-txt-link-freetext" href="http://members.shaw.ca/petersfreeman">http://members.shaw.ca/petersfreeman</a><br>
</div>
</div>
<br>
On 11-01-30 12:55 PM, Richard Weait wrote:
<blockquote
cite="mid:AANLkTinhfx3Wfzpokf3+FRjoOQwPsaE+0Ueh-81CfJtw@mail.gmail.com"
type="cite">
<pre wrap="">On Sun, Jan 30, 2011 at 3:47 PM, Peter Freeman <a class="moz-txt-link-rfc2396E" href="mailto:petersfreeman@gmail.com"><petersfreeman@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi Stewart,
Thanks! I have just installed Quantum GIS (I'm running Ubuntu 10.10) and
have loaded the JPEG as a raster file and am now learning how do do what you
suggested.
</pre>
</blockquote>
<pre wrap="">
It is possible that the map on the sign board is "artistic", rather
than accurate, so It might not even have a scale or projection. ;-)
Now, getting ground control points right from a photo will also
involve compensating for lens distortion. So this might be a lot of
fun!
_______________________________________________
Talk-ca mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Talk-ca@openstreetmap.org">Talk-ca@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="http://lists.openstreetmap.org/listinfo/talk-ca">http://lists.openstreetmap.org/listinfo/talk-ca</a>
</pre>
</blockquote>
</body>
</html>