<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">Oh man you are about to have fun. My
apologies to the list if this gets too weird and wild. <br>
<br>
1. You downloaded a ZIP file from the data gateway - I'm going to
use an example from my neck of the woods in TN. That zip file
contains a file that is going to look similiar to
ortho_1-1_1n_s_TN135_2012_1.shp.txt. It is a text file and if you
scroll through it it describes all the fun that was had in the
making of this image. The coordinates will be in UTM (your GPS
points are WGS84). About halfway down you will see a block of text
in this file that looks like: <br>
<br>
Spatial_Reference_Information:<br>
Horizontal_Coordinate_System_Definition:<br>
Planar:<br>
Grid_Coordinate_System:<br>
Grid_Coordinate_System_Name: Universal Transverse Mercator<br>
Universal_Transverse_Mercator:<br>
UTM_Zone_Number: 16<br>
Transverse_Mercator:<br>
Scale_Factor_at_Central_Meridian: 0.999600<br>
Longitude_of_Central_Meridian: -87.0<br>
Latitude_of_Projection_Origin: 0.0<br>
False_Easting: 500000<br>
False_Northing: 0.0<br>
<br>
This means that the file is in UTM Zone 16 NAD 83. I'm going to
guess you are zone 15 or 14 <br>
<br>
2. Start a new project and add the NAIP image. <br>
3. Georeference against the NAIP (ignoring your GPS points) for a
bit. You want to use the same coordinate that the SID is in for
simplicity. <br>
4. Once it is georeferenced doubel check your new rectified file
against the SID - see if they line up. If YES....<br>
5. Add your GPS - QGIS shrould re-project on the fly and move them
to the right spot. <br>
<br>
If all of this gets too crazy - email me off list and I can walk
you through it and we can summarize for everyone following along.
<br>
<br>
Randy<br>
<br>
<pre class="moz-signature" cols="72">-----------------
Randal Hale, GISP
North River Geographic Systems, Inc
<a class="moz-txt-link-freetext" href="http://www.northrivergeographic.com">http://www.northrivergeographic.com</a>
423.653.3611 <a class="moz-txt-link-abbreviated" href="mailto:rjhale@northrivergeographic.com">rjhale@northrivergeographic.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:rjhale@northrivergeographic.com"><mailto:rjhale@northrivergeographic.com></a>
twitter:rjhale
<a class="moz-txt-link-freetext" href="http://about.me/rjhale">http://about.me/rjhale</a></pre>
On 02/05/2014 02:32 PM, Mike Keelan wrote:<br>
</div>
<blockquote cite="mid:52F291D9.9000004@comcast.net" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<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:part1.06070502.09080809@northrivergeographic.com"
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>
</div>
<blockquote cite="mid:52F273F1.9080409@northrivergeographic.com"
type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<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>
</div>
<blockquote cite="mid:52F26F22.1040500@comcast.net" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<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">Spatial_Reference_Information:<br>
Horizontal_Coordinate_System_Definition:<br>
Planar:<br>
Grid_Coordinate_System:<br>
Grid_Coordinate_System_Name: Universal Transverse
Mercator<br>
Universal_Transverse_Mercator:<br>
UTM_Zone_Number: 16<br>
Transverse_Mercator:<br>
Scale_Factor_at_Central_Meridian: 0.999600<br>
Longitude_of_Central_Meridian: -87.0<br>
Latitude_of_Projection_Origin: 0.0<br>
False_Easting: 500000<br>
False_Northing: 0.0<br>
Mike K<br>
<br>
</div>
On 2/3/2014 8:28 PM, James Wood wrote:<br>
</div>
<blockquote
cite="mid:BLU178-W15D7516A06C5F2F3494CDFBDAA0@phx.gbl"
type="cite">
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 12pt;
font-family:Calibri
}
--></style>
<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>
</div>
</div>
</div>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Qgis-user mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://lists.osgeo.org/mailman/listinfo/qgis-user">http://lists.osgeo.org/mailman/listinfo/qgis-user</a></pre>
</blockquote>
<br>
</blockquote>
<br>
</blockquote>
<br>
</body>
</html>