[Qgis-user] Yet another projection question, I think

[Jerry Bond]

On Saturday, April 21, 2012 11:35:29 AM Micha Silver wrote:
>  A couple of question that might help find where the problem is:
> 
>  On 04/21/2012 05:59 PM, Jerry Bond wrote:
> Hi List --
> 
> I hate to bring such basic stuff, but I can't solve this and need it for a
> business project.  I am running QGIS 1.7.2 on MEPIS 11 (based on Debian
> Stable).
> 
> I have a set of tree locations collected in the field, and they import
> correctly into Google Earth.  I set up a QGIS project, brought in
> orthoimages from NYS GIS Clearinghouse and loaded the correct ones without
> problem.  Their projection is WGS 84, when I click on the lower right
> corner.
> 
>  WHen you click in the right corner, that shows the Coordinate System of
> the *project*, not the layer.  Please check the ortho-photo's CRS in the
> layer's properties windows, metadata tab. Do you know in advance, for
> sure, that the ortho-photos are in Lon/Lat WGS84?? (Usually aerial photos
> are supplied in some projected CRS, *not* in the un-projected Lon/Lat
> WGS84 CRS)
> 
> 
> Then I created a delimited layer importing the tree locations, and I can
> see all the points and the data are all correct.  That projection is also
> WGS 84. But the points do not show on the orthos (yes the layer is
> checked) and I do not know how to proceed at this point.
>  To get a clearer idea of what's going on, right-click on the tree
> locations layer and do a "Zoom to Layer", then check what the coordinates
> are (in the status bar) as you move the mouse from tree to tree. I assume
> they will be numbers in degrees Lon and Lat ? Now right click on the ortho
> layer, and again "Zoom to Layer". Now move the mouse around the image, and
> check what coordinates you get.
> 
>  If the orthos are in some projected CRS, and correctly recognized, the
> solution might be very simple: Just open the Project Properties window
> (click that same symbol in the lower right corner), and in the CRS tab,
> check to "Enable On the Fly" projection.
> 
>  HTH,
>  Micha
> 
> 
> 
> I need a map I can take into the field next week, so I'd appreciate any
> advice people might have.
> 
> Jerry Bond
> Urban Forest Analytics
> http://www.urbanforestanalytics.com
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> This mail was received via Mail-SeCure System.
(Didn't know it was that basic...)  Thanks for answering.  

The orthos are in fact in NAD 83, and I have Lon/Lat degrees associated with 
the tree points like this:  

wkt_geom	ID	Tag	Latitude	Longitude
POINT(-73.775020 43.075923)	1	199	43.0759233333	-73.77502

Since there are 10 orthos and only one tree file, should I then convert that 
one to NAD 83?

Thanks again

Jerry