Hi all,<div>I'm reading the GRASS7 programmer's manual, to update my experience with GRASS (I'm going to use it for some network analysis, and probably I will need to extend it)</div><div>Looking at the topology examples [1] I fill a bit confused by the "types" of nodes and lines, which vary between the different kind of topological structures.</div>
<div><br></div><div> - Point example: a point doesn't have nodes but have a line (P_LINE), with type GV_POINT.</div><div>It's enough for me to get confused :)</div><div>A P_LINE structure has a void * topo opaque element [2], which will point to the relative topology structure depending on the type. In case of a G_POINT type, what is the topology structure attached to the topo pointer?</div>
<div><br></div><div> - Line example: two nodes with type GV_LINE. A P_NODE doesn't have a type [3], so how can it be... a GV_LINE? :(</div><div><br></div><div>I'm missing something. Could you help to understand it?</div>
<div>Thanks a lot,</div><div>giovanni</div><div><br></div><div><br></div><div>[1] <a href="http://grass.osgeo.org/programming7/vlibTopology.html#vlibTopoExamples">http://grass.osgeo.org/programming7/vlibTopology.html#vlibTopoExamples</a></div>
<div>[2] <a href="http://grass.osgeo.org/programming7/structP__line.html">http://grass.osgeo.org/programming7/structP__line.html</a></div><div>[3] <a href="http://grass.osgeo.org/programming7/structP__node.html">http://grass.osgeo.org/programming7/structP__node.html</a><br clear="all">
<div><br></div>-- <br>Giovanni Allegri<br><a href="http://about.me/giovanniallegri" target="_blank">http://about.me/giovanniallegri</a><br>blog: <a href="http://blog.spaziogis.it" target="_blank">http://blog.spaziogis.it</a><br>
GEO+ geomatica in Italia <a href="http://bit.ly/GEOplus" target="_blank">http://bit.ly/GEOplus</a>
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