3
Allows a user to create a PROJ_INFO file in the PERMANENT mapset of the
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current location. PROJ_INFO file is used to record the projection information
5
associated with the specified mapset.
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The user running <em>g.setproj</em> must own the PERMANENT
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mapset and it must be currently selected.
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It is highly recommended to run <em>g.setproj</em> after
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creating a new location so that conversion programs (such
13
as <em>v.proj</em>) can be run.
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<p>The user will be prompted for the projection name.
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Most projections are supported. The
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<a href="http://proj.maptools.org/">PROJ.4</a> abbreviations for the names are
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used with two exceptions, viz. 'll', for latitude / longitude geographic
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co-ordinates, and 'stp', for the State Plane Co-ordinate system (used in the
22
<p>After the projection name, the user will be asked for a geodetic datum. If
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no datum transformation support is needed, the question may be answered with no,
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and no datum will be specified in the PROJ_INFO file. If this is the case
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the user must specify the ellipsoid (model of the curvature of the earth) to
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be used, otherwise it is determined by the datum being used.
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<p>If the datum or ellipsoid required are not
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listed within this program, the user/administrator may add the definition
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to the files datum.table, datumtransform.table and ellipse.table in the
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$GISBASE/etc/ directory.
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<p>Depending on the projection selected, the user will then be prompted for
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the various other parameters required to define it.
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The projections of aea, lcc, merc, leae, leac, and
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tmerc will generate a request to the user for the prime meridian and standard
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parallel for the output map.
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<em><a href="g.proj.html">g.proj</a></em>,
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<em><a href="m.proj.html">m.proj</a></em>,
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<em><a href="r.proj.html">r.proj</a></em>,
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<em><a href="v.proj.html">v.proj</a></em>,
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<em><a href="http://proj.maptools.org">PROJ.4</a></em>
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<b>Further reading</b>
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<li> A guide to <a href="http://erg.usgs.gov/isb/pubs/MapProjections/projections.html">Map Projections</a> by USGS
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<li> <a href="http://www.asprs.org/persjournals/PE-RS-Journals/Grids-Datums.html">ASPRS Grids and Datum</a>
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<li> <a href="http://www.mapref.org">MapRef - The Collection of Map Projections and Reference Systems for Europe</a>
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<li> <a href="http://www.remotesensing.org/geotiff/proj_list/">Projections Transform List</a> (PROJ4)
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U.S. Army Construction Engineering
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Research Laboratory<br>
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Morten Hulden, morten at untamo.net - rewrote module and added 121 projections <br>
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Andreas Lange, andreas.lange at rhein-main.de - added prelimnary map datum support
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<i>Last changed: $Date: 2012-03-30 13:47:33 +0200 (Fri, 30 Mar 2012) $</i>