Differences

This shows you the differences between two versions of the page.

--- projection_type [2015/10/13 17:51]
admin [Projection Type]
+++ projection_type [2016/11/22 22:00] (current)
hermann [Projection Type]
@@ Line 1: / Line 1: @@
 ====== Projection Type ======
-Represents a [[wp>Map_projection|map projection]]. Projections can be defined using the predefined options (UTM, Geodetic etc) or using a WKT specification.
+Represents a [[wp>Map_projection|map projection]]. Projections can be defined using the predefined options (UTM, Geodetic etc), using a WKT specification, using an EPSG code or using a Proj4 specification.
-WKT specifications must follow the [[wkt format|standard syntax]]. See the example below:
+WKT specifications must follow the [[wkt format|WKT standard syntax]]. See the example below:
     PROJCS["SUTM21",
@@ Line 18: / Line 18: @@
         PARAMETER["false_northing",10000000],
         UNIT["Meter",1]]
+The Proj4 syntax must also follow the [[http://proj4.org/parameters.html|Proj4 specification syntax]]. Example:
+    [ +proj=latlong +ellps=GRS80 +towgs84=-199.87,74.79,246.62 ]
 ===== GUI Editor =====
-[{{ :editors:projection_editor.png?nolink& |Graphical representation of the projection editor}}]
+[{{ :editors:projection_editor.png?nolink&500 |Graphical representation of the projection editor}}]
 ===== EGO Script =====
@@ Line 72: / Line 76: @@
        PARAMETER["false_northing",-2000000],
        UNIT["METERS",1]]]
+|]
+</code>
+==== Using a Proj4 description ====
+<code cpp>
+[| "COORDINATE_TYPE", [ PROJ4_PROJECTION ] |]
+</code>
+The syntax used to the represent the PROJ4_PROJECTION can be found [[http://proj4.org/parameters.html|here]].
+Example:
+<code cpp>
+[| "LATLONG",
+   [ +proj=longlat +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +no_defs ]
+|]
+</code>
+==== Using a EPSG code ====
+<code cpp>
+[| "COORDINATE_TYPE", EPSG_CODE ] |]
+</code>
+Example:
+<code cpp>
+[| "LATLONG",
 |]
 </code>