[Qgis-community-team] re-projection
Chuck Young
wylie1066 at gmail.com
Wed Apr 27 13:21:38 EDT 2011
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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