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Hi All,<br>
I've looked at the topology plugin, but can't find what I need to
do.<br>
I've been exporting the data into Genamap and doing this with
scripts, but it would be nice to do it in QGIS.<br>
Anyone know of a plugin?<br>
<br>
Quite often now we've been asked to deliver products whereby there
are vertices placed onto graphic elements where they cross over, or
end on, each other (in different layers (Shape files)).<br>
<br>
eg: A road line stops at the edge of a cropfield polygon, so drop a
vertice at that place, on the cropfield boundary. Likewise if a road
runs through a field, but the data capture scale requires the field
not to be split into two polygons, drop the vertice at the points
where the road crosses over the field boundary.<br>
<br>
Ideally this could be implemented by:<br>
<ul>
<li>Check boxes to select all the layers you want to process
(mixture between multiple polygon and line layers)</li>
<li>selecting the snapping distance (for lines that end "close
enough" to other boundaries or lines).</li>
<li>Having a separate checkbox for "Crossover" and for "Line ends"</li>
<li>Perhaps even an option to log (create a pointfile) when lines
end within 'X' of any boundary or line (where X is a secondary
snap distance)</li>
<li>perhaps have an option to log (point file) where lines run
parallel to others, within the snap distance set (maybe with
even a tertiary snap distance)<br>
</li>
</ul>
Instead of looping through multiple snap distances, one could
implement a checkbox to either drop the vertice, or to just mark the
position where the vertice should have been dropped - this would be
easier for the developer, but require the user to run the procedure
multiple times, in order to see where "close enough" stuff lies.<br>
<br>
Any comments?<br>
<br>
Regards,<br>
Zoltan<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
P.O. Box 7, Muizenberg 7950, South Africa.
Mobile: +27-83-6004028
Fax: +27-86-6115323 <a class="moz-txt-link-abbreviated" href="http://www.geograph.co.za">www.geograph.co.za</a>
===========================================</pre>
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