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<div class="moz-cite-prefix">OK I already have a .sid file for the
area of interest, but if im going to use the coordinants as given
from the Qgis program the data does not seem to be compatable with
the GCP table info, or the Infor requested in the input dialog box
to create the reference points for the .jpg raster. ie the format
from the Qgis main view is xxxxxxxx,xxxxxx Is this projected
Long,Lat data?<br>
<br>
<img alt="" src="cid:part1.00040307.07080604@comcast.net"
height="78" width="513"><br>
<br>
Mike<br>
<div class="moz-signature"><br>
<br>
</div>
On 2/5/2014 12:25 PM, Randal Hale wrote:<br>
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<div class="moz-cite-prefix">So I work with Forestry guys and we
do some very similar things when georeferencing. You need a good
point spacing - and typically I describe that as a point at each
coner of the image you are going to georeference plus one for
the middle or (sorry for using this example but they have really
good docs) - <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Georeferencing_a_raster_dataset">http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Georeferencing_a_raster_dataset</a>
<br>
<br>
If it were me I would do this: <br>
1. go to USDA Datagateway - <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://datagateway.nrcs.usda.gov/">http://datagateway.nrcs.usda.gov/</a>
- and download a NAIP image of your Area (sorted by county). It
will be sid format (probably) - so if you are on windows you
should be OK for opening up the image. <br>
2. Use that to georeference the Google earth Screenshot. It will
give you a lot more control points than just your GPS. <br>
<ul>
<li>GPS can be notorious for not quite being right if you
didn't way point average - my forestry guys GPS property
corners and that makes me not happy every time they do it.</li>
<li>Both Google and Bing are good and the open layers plugin
rocks - but - both image layers aren't captured (at least to
me) with mapping in mind - i.e. they may be questionable. <br>
</li>
</ul>
<br>
OR <br>
<br>
1. Download the GPX data from your unit using either QGIS or DNR
GPS <br>
2. Convert to shapefile. <br>
3. Create your contours there using a new shapefile (digitize
them in again). <br>
<br>
I know I just glassed over a ton of technical by doing a 1 2 3
type scenario but I think (just my opinion) there's more hair
pulling than you need to be experiencing (For the record I'm
bald so I know all about hair pulling). <br>
<br>
Yell if you need more help either off list or on list - I hope
some of this at least pushes you in a good direction. <br>
<br>
Randy<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">-----------------
Randal Hale, GISP
North River Geographic Systems, Inc
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.northrivergeographic.com">http://www.northrivergeographic.com</a>
423.653.3611 <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:rjhale@northrivergeographic.com">rjhale@northrivergeographic.com</a>
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:rjhale@northrivergeographic.com"><mailto:rjhale@northrivergeographic.com></a>
twitter:rjhale
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://about.me/rjhale">http://about.me/rjhale</a></pre>
On 02/05/2014 12:04 PM, Mike Keelan wrote:<br>
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<div class="moz-cite-prefix">Thanks James,<br>
<br>
I got through the geo-referencing operation and it did
generate a new modified layer based on my .jpg. However the
new layer is badly distorted/stretched, (I used 4 coordinate
Garmin GPS reference points), and it is not in the right
location. I can only find it by zooming to that layer
extent. I'm wondering if my coordinate data from my Garmin is
consistent with what the geo-referencing program uses? My
Garmin data is xx.xxxxxx and it uses negative numbers to
represent East instead of West. Or, might there be an
accuracy issue?<br>
<br>
I know my Garmin way-point data is good because it overlays on
my Ortho almost perfectly as a separate layer.<br>
<div class="moz-signature"><br>
Mike K<br>
<br>
</div>
On 2/3/2014 8:28 PM, James Wood wrote:<br>
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<div dir="ltr">Mike,<br>
Here is a good tutorial overview of the georeferencing tool
in QGIS:<br>
<a moz-do-not-send="true"
href="http://qgis.spatialthoughts.com/2012/02/tutorial-georeferencing-topo-sheets.html">http://qgis.spatialthoughts.com/2012/02/tutorial-georeferencing-topo-sheets.html</a><br>
<br>
If the image is not in coordinate space, it will not line up
with your other data. so this operation will be necessary.<br>
<br>
Also, just as a side, I would think that an export from
Powerpoint would degrade image quality (depending on the
original). I would look at and maybe try for future use The
Gimp (which is an open source, free Photoshop-type
application). It will give you more control on export of not
only various output formats but also pixel and color depth,
and the like. The official site is <a
moz-do-not-send="true" href="http://www.gimp.org/">http://www.gimp.org/</a>.<br>
<br>
Best Regards,<br>
James<br>
<br>
<br>
<div>
<hr id="stopSpelling">Date: Mon, 3 Feb 2014 19:59:14 -0500<br>
From: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:tmike.elhoa@comcast.net">tmike.elhoa@comcast.net</a><br>
To: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:tech@wildintellect.com">tech@wildintellect.com</a>;
<a moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:etourigny.dev@gmail.com">etourigny.dev@gmail.com</a><br>
CC: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
Subject: Re: [Qgis-user] How do I register a Google Map?<br>
<br>
<div class="ecxmoz-cite-prefix">OK, I installed the Open
Layers plugin and it works very nice but it won't do
what I need, so let me be more specific and see if there
might be a remedy. <br>
<br>
The contour lines that I want were actually obtained
using a hand held Garman GPS. The Garman data was
overlaid on the Google map, (with water depths),
special integration, then that map was exported as a
Jpeg, then imported to PowerPoint where a visual
interpolation was done to make the final set of contour
lines for the various lake water depths.<br>
<br>
My desire is the <u>digitize</u> these contour lines as
a set of separate layers. ie 5' deep, 10' deep, etc.
There are many good uses for these layers, but they
must be accurate as to location and size. I don't think
I necessarily need spacial info on the "map"/Jpeg if I
can get the whole map in the right position, and size,
so I can do the digitizing (which would then have the
spacial info). Then I can discard the Jpeg.<br>
<br>
Is it hopeless?<br>
<br>
Mike K<br>
<br>
<br>
<br>
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