I have loaded a shapefile into QGis. The shapefile is in lat/long and
is not projected. Indeed, its .prj file contains:
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 learned how to apply an on the fly projection, and have
learned that if I use "Save as Shapefile" and apply the same
projection in the Save As process, the new shapefile is in the
projected coordinate system.
Suppose, however, that someone provides me with a shapefile that is
already projected, using the same projection I applied above.
For example, the .prj file contains:
PROJCS["NAD_1983_StatePlane_New_York_Long_Island_FIPS_3104_Feet",
GEOGCS["GCS_North_American_1983",
DATUM["D_North_American_1983",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Lambert_Conformal_Conic"],
PARAMETER["Central_Meridian",-74.0],
PARAMETER["False_Easting",984250.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Latitude_Of_Origin",40.16666666666666],
PARAMETER["Standard_Parallel_1",40.66666666666666],
PARAMETER["Standard_Parallel_2",41.03333333333333],
UNIT["Foot_US",0.3048006096012192]]
I would like to be able do the reverse operation. That is,
"unproject" this shapefile and use the Save as Shapefile dialog to
make a copy that is in lat/long.
I haven't found out how to do this, and would appreciate some help doing it.
Thanks
-Don
p.s., if anyone is curious as to why, the actual application is to
load the projected shapefile, add a new vector layer as a shapefile
(such as a polygon), and save the new layer as a shapefile in
un-projected coordinates.
--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
--------------------------------------
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