[Qgis-community-team] re-projection

[Otto Dassau]

Dear Chuck,

sorry, but this is the wrong list. Please send this email to the User
mailing list (first on the website).

http://www.qgis.org/en/community/mailing-lists.html

This list is about documentation, context help, user-guide etc.

Kind regards,
 Otto 

Am Wed, 27 Apr 2011 10:21:38 -0700
schrieb Chuck Young <wylie1066 at gmail.com>:

> I am new to this list and hope you can help.
> 
>  I have a GeoTif raster file that currently shows  "+proj=longlat
> +ellps=WGS84 +datum=WGS84 +no_defs" as its CRS in the Options form in QGIS.
> 
> I have the Tiger shapefile that has in the .prj file
> GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
> 
> I have added several vector layers that I have created with QGIS and all
> have the following in their .prj files.
> GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
> 
> I need to be able to get the Tiger data to align with the GeoTif and other
> layers.
> 
> I tried to export the Tiger file using the Vector / Data Management Tools /
> Export to new Projection
> 
> I first loaded two Vector layers. First a local layer that was in the
> desired projection. (a layer that I created ) having the same info in the
> .prj file as noted above [WGS 1984].
> Then I loaded the tiget shapefile layer.
> 
> I selected the Import spacial ref from existing layer
> 
> I tried switching the input and output selections both ways:
>      first I selecting local layers spacial ref system "+proj=longlat
> +ellps=WGS84 +datum=WGS84 +no_defs"  as Input
>         and the Tiger shapefile spacial ref "+proj=longlat +ellps=GRS80
> +datum=NAD83 +no_defs" as output
> This created a set of files
> 
>      Then I switched the input and output
> Both produced the following in the .prj files
> 
> GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
> GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
> 
> IO load any of these with the rest of the layers and zoom extents and get a
> white screen with a little speck in one corner.  That speck is the raster
> layer and all the layers I created manually.
> 
> Please help!
> 
> Thanks
> 
> Chuck


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