[GRASS-SVN] r39562 - grass/branches/develbranch_6/lib/vector

[svn_grass at osgeo.org]

Author: mmetz
Date: 2009-10-18 11:58:22 -0400 (Sun, 18 Oct 2009)
New Revision: 39562

Modified:
   grass/branches/develbranch_6/lib/vector/vectorlib.dox
Log:
vector lib documentation updated for devbr6

Modified: grass/branches/develbranch_6/lib/vector/vectorlib.dox
===================================================================
--- grass/branches/develbranch_6/lib/vector/vectorlib.dox	2009-10-18 15:57:30 UTC (rev 39561)
+++ grass/branches/develbranch_6/lib/vector/vectorlib.dox	2009-10-18 15:58:22 UTC (rev 39562)
@@ -142,8 +142,8 @@
 <li> line: a directed sequence of connected vertices with two endpoints called nodes;
 <li> boundary: the border line to describe an area;
 <li> centroid: a point within a closed boundary;
-<li> area: the topological composition of centroid and boundary;
-<li> face: a 3D area;
+<li> area: the topological composition of a closed ring of boundaries and optionally a centroid;
+<li> face: a 3D boundary;
 <li> kernel: a 3D centroid in a volume;
 <li> volume: a 3D corpus, the topological composition of faces and kernel.
 </ul>
@@ -151,7 +151,7 @@
 Note that all lines and boundaries can be polylines (with nodes in
 between).
 
-Topology also holds information about isles. Isles are located within an area, not
+Area topology also holds information about isles. Isles are located within an area, not
 touching the boundaries of the outer area. Isles consist of one or more areas
 and are used internally by the vector libraries to maintain correct topology of areas.
 
@@ -168,7 +168,7 @@
 
 <ul>
 <li> diglib (with dig_*() functions), GRASS 3.x/4.x
-<li> Vlib (with V1_*(), V2_*() and Vect_*() functions), GRASS 4.x/5.x (except for the 5.7 interim version)
+<li> Vlib (with V1_*(), V2_*() and Vect_*() functions), since GRASS 4.x (except for the 5.7 interim version)
 </ul>
 
 The vector library was introduced in GRASS 4.0 to hide internal vector
@@ -501,7 +501,8 @@
 In GRASS, whenever an 'inner' ring touches the boundary of an outside area, even in
 one point, it is no longer an 'inner' ring (Isle in GRASS topology), it is
 simply another area. A, B above can never be exported from GRASS as polygon A
-with inner ring B because there are only 2 areas A and B and no island.
+with inner ring B because there are only 2 areas A and B and one island
+formed by A and B together.
 
 
 \subsection Topology_Example_3 Topology Example 3: