[GRASS-SVN] r58696 - grass/branches/releasebranch_6_4/vector/v.proj
svn_grass at osgeo.org
svn_grass at osgeo.org
Mon Jan 13 01:31:51 PST 2014
Author: neteler
Date: 2014-01-13 01:31:51 -0800 (Mon, 13 Jan 2014)
New Revision: 58696
Modified:
grass/branches/releasebranch_6_4/vector/v.proj/description.html
Log:
v.proj manual: ASPRS url update; cosmetics
Modified: grass/branches/releasebranch_6_4/vector/v.proj/description.html
===================================================================
--- grass/branches/releasebranch_6_4/vector/v.proj/description.html 2014-01-13 09:20:50 UTC (rev 58695)
+++ grass/branches/releasebranch_6_4/vector/v.proj/description.html 2014-01-13 09:31:51 UTC (rev 58696)
@@ -4,9 +4,10 @@
of a specified location (different from current) with projection of input
location to the vector map in a current mapset of current location with
projection of current location (both projections are defined by
-corresponding PROJ_INFO files).
+corresponding PROJ_INFO files). The projection information is taken from the
+current PROJ_INFO files, as set and viewed with
+<em><a href="g.proj.html">g.proj</a></em>.
-
<h2>NOTES</h2>
If <b>output</b> is not specified it is set to be the same as input map
@@ -25,6 +26,14 @@
<em>v.proj</em> supports general datum transformations, making use of the
<em>PROJ.4</em> co-ordinate system translation library.
+<p>
+In order to preserve spatial detail, it is recommended to densify linear
+features with <em><a href="v.split.html">v.split</a></em> before
+reprojecting. Depending on the source and target CRS
+(Coordinate Reference System), geometries can be substantially
+deformed (straight lines become curves, squares become trapezoids, etc).
+In these cases densification of linear features can help to avoid
+topological errors.
<h2>EXAMPLES</h2>
@@ -34,12 +43,12 @@
<h2>REFERENCES</h2>
-<a href=http://proj.maptools.org/>PROJ 4</a>: Projection/datum support library.
+<a href="http://trac.osgeo.org/proj/">PROJ 4</a>: Projection/datum support library.
<p>
<b>Further reading</b>
<ul>
-<li> <a href="http://www.asprs.org/persjournals/PE-RS-Journals/Grids-Datums.html">ASPRS Grids and Datum</a>
+<li> <a href="http://www.asprs.org/Grids-Datums.html">ASPRS Grids and Datum</a>
<li> <a href="http://www.mapref.org">MapRef - The Collection of Map Projections and Reference Systems for Europe</a>
<li> <a href="http://www.remotesensing.org/geotiff/proj_list/">Projections Transform List</a> (PROJ4)
</ul>
@@ -53,6 +62,7 @@
<a href="i.rectify.html">i.rectify</a>,
<a href="r.stats.html">r.stats</a>,
<a href="v.sample.html">v.sample</a>,
+<a href="v.split.html">v.split</a>,
<a href="v.surf.idw.html">v.surf.idw</a>,
<a href="v.surf.rst.html">v.surf.rst</a>
</em>
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