[GRASS-user] Correctly Converting LL to LCC
mseibel at gmail.com
Mon Dec 28 11:08:28 EST 2009
Can you setup a lat/long in GRASS, import lat/long points, then
reproject within GRASS to your LCC projection?
On Dec 28, 2009, at 10:46 AM, Rich Shepard <rshepard at appl-ecosys.com>
> I apologize in advance for cross-posting this message, but I need to
> quickly resolve this issue so I can proceed with the project. I
> posted this
> to the proj4j mail list Friday (yes, I know it was a holiday), but
> have seen
> no traffic on that list at all, and no responses to this request.
> someone here can help me.
> There are three points whose geographic coordinates I have in long/
> lat. I
> need to convert these to the Oregon Lambert Conformal Conic
> projection with
> the Washington-Oregon adjustment. When I try doing this with the
> cs2cs tool I
> get incorrect values as a result.
> This is the input file:
> This is the command line I used:
> cs2cs +proj=latlong +datum=NAD83 +to +proj=lcc +datum=NAD83
> +ellps=GRS80 \
> +lat_1=43.0 +lat_2=45.5 +lat_0=41.75 +lon_0=-120.5 +x_0=1312336
> +y_0=0 +nadgrids=WO
> The above values are taken from the metadata for the Oregon LCC:
> Lambert Conformal Conic
> stdparll 43.000000
> stdparll 45.500000
> long center -120.500000
> latprj origin 41.750000
> false east 1312335.958000 (International feet)
> false north 0.000000
> North American Datum of 1983
> Geodetic Reference System 80
> semiaxis 6378137.000000
> denflat 298.257222
> And these are the results:
> Not only do these seem reversed, they are not at all within the
> bounds of
> the other project maps.
> I have the middle location on a separate map that was imported to
> from an ESRI file, and its coordinates are approximately 796758.58,
> 1305792.74. Those values are in easting, northing order (at least,
> the way I presume the GRASS-6.4 wxPython display presents them), and
> in magnitude from what cs2cs produced.
> What have I done incorrectly? How should I properly translate the
> values to lcc for my project?
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