[mapserver-commits] r12001 - branches/branch-6-0/docs/en/mapfile trunk/docs/en/mapfile

[svn at osgeo.org]

Author: havatv
Date: 2011-08-05 02:41:08 -0700 (Fri, 05 Aug 2011)
New Revision: 12001

Modified:
   branches/branch-6-0/docs/en/mapfile/projection.txt
   trunk/docs/en/mapfile/projection.txt
Log:
Improved explanation in projection (#3093)

Modified: branches/branch-6-0/docs/en/mapfile/projection.txt
===================================================================
--- branches/branch-6-0/docs/en/mapfile/projection.txt	2011-08-05 09:18:48 UTC (rev 12000)
+++ branches/branch-6-0/docs/en/mapfile/projection.txt	2011-08-05 09:41:08 UTC (rev 12001)
@@ -4,14 +4,23 @@
  PROJECTION
 *****************************************************************************
 
-To set up projections you must define two projection objects: one for the
-output image (in the :ref:`MAP` object) and one for each layer (in the
-:ref:`LAYER` objects) to be projected. MapServer relies on the :term:`Proj.4`
-library for projections. Projection objects therefore consist of a series of
-PROJ.4 keywords, which are either specified within the object directly or
-referred to in an :term:`EPSG` file. An EPSG file is a lookup file containing
-projection parameters, and is part of the PROJ.4 library.
+There are thousands for geographical reference systems.  In order to
+combine datasets with different geographical reference systems into a
+map, the datasets will have to be transformed (projected) to the
+chosen geographical reference system of the map.  If you want to know
+more about geographical reference systems and map projections, you
+could take some Geomatics courses (Geographical Information Systems,
+Cartography, Geodesy, ...).
 
+To set up projections you must define one projection objects for the
+output image (in the :ref:`MAP` object) and one projection object for
+each layer (in the :ref:`LAYER` objects) to be projected. MapServer
+relies on the :term:`Proj.4` library for projections. Projection
+objects therefore consist of a series of PROJ.4 keywords, which are
+either specified within the object directly or referred to in an
+:term:`EPSG` file. An EPSG file is a lookup file containing projection
+parameters, and is part of the PROJ.4 library.
+
 The following two examples both define the same projection (UTM zone 15,
 NAD83), but use 2 different methods:
 
@@ -113,4 +122,4 @@
 
 .. _`PROJ.4`: http://trac.osgeo.org/proj/
 .. _`Cartographical Map Projections`: http://www.progonos.com/furuti/MapProj/Normal/TOC/cartTOC.html
-.. _`email list archives`: http://lists.osgeo.org/pipermail/mapserver-users/
\ No newline at end of file
+.. _`email list archives`: http://lists.osgeo.org/pipermail/mapserver-users/

Modified: trunk/docs/en/mapfile/projection.txt
===================================================================
--- trunk/docs/en/mapfile/projection.txt	2011-08-05 09:18:48 UTC (rev 12000)
+++ trunk/docs/en/mapfile/projection.txt	2011-08-05 09:41:08 UTC (rev 12001)
@@ -4,14 +4,23 @@
  PROJECTION
 *****************************************************************************
 
-To set up projections you must define two projection objects: one for the
-output image (in the :ref:`MAP` object) and one for each layer (in the
-:ref:`LAYER` objects) to be projected. MapServer relies on the :term:`Proj.4`
-library for projections. Projection objects therefore consist of a series of
-PROJ.4 keywords, which are either specified within the object directly or
-referred to in an :term:`EPSG` file. An EPSG file is a lookup file containing
-projection parameters, and is part of the PROJ.4 library.
+There are thousands for geographical reference systems.  In order to
+combine datasets with different geographical reference systems into a
+map, the datasets will have to be transformed (projected) to the
+chosen geographical reference system of the map.  If you want to know
+more about geographical reference systems and map projections, you
+could take some Geomatics courses (Geographical Information Systems,
+Cartography, Geodesy, ...).
 
+To set up projections you must define one projection objects for the
+output image (in the :ref:`MAP` object) and one projection object for
+each layer (in the :ref:`LAYER` objects) to be projected. MapServer
+relies on the :term:`Proj.4` library for projections. Projection
+objects therefore consist of a series of PROJ.4 keywords, which are
+either specified within the object directly or referred to in an
+:term:`EPSG` file. An EPSG file is a lookup file containing projection
+parameters, and is part of the PROJ.4 library.
+
 The following two examples both define the same projection (UTM zone 15,
 NAD83), but use 2 different methods:
 
@@ -113,4 +122,4 @@
 
 .. _`PROJ.4`: http://trac.osgeo.org/proj/
 .. _`Cartographical Map Projections`: http://www.progonos.com/furuti/MapProj/Normal/TOC/cartTOC.html
-.. _`email list archives`: http://lists.osgeo.org/pipermail/mapserver-users/
\ No newline at end of file
+.. _`email list archives`: http://lists.osgeo.org/pipermail/mapserver-users/