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Arnaud Diederen wrote:
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<br>
Hi Martin,<br>
<br>
Martin Daly wrote:
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<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Verdana","sans-serif"; color: blue;">1.
Closed LinearRings follows the Simple Features spec (as does the
other geometry).</span></p>
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<br>
Ok,<br>
<br>
<blockquote
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<p class="MsoNormal"><span
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<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Verdana","sans-serif"; color: blue;">2.
You need to be able to distinguish between, for example, a two-point
3D LineString (with xyz) and a three-point 2D LineString (with xy),
both of
which have six ordinates.</span></p>
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<br>
How about a "cardinality" field, holding the dimension? (i.e., 2 or 3)<br>
<br>
A.<br>
<br>
<blockquote
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<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Verdana","sans-serif"; color: blue;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><span
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US"> <a class="moz-txt-link-abbreviated"
href="mailto:geojson-bounces@lists.geojson.org">geojson-bounces@lists.geojson.org</a>
[<a class="moz-txt-link-freetext"
href="mailto:geojson-bounces@lists.geojson.org">mailto:geojson-bounces@lists.geojson.org</a>]
<b>On Behalf Of </b>Arnaud
Diederen<br>
<b>Sent:</b> 16 June 2008 09:54<br>
<b>To:</b> <a class="moz-txt-link-abbreviated"
href="mailto:geojson@lists.geojson.org">geojson@lists.geojson.org</a><br>
<b>Subject:</b> Re: [Geojson] Finishing the edits<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><br>
Hello list,<br>
<br>
I noticed the 1.0 spec is out, but I have a quick question.<br>
<br>
I'm wondering if there's a particular reason for storing points data
into
arrays of their own.<br>
For example, a polygon with three points would be described as: <br>
<span style="color: silver;">(by the way, why do linear rings have
to
be closed
by a duplicate of the first point, like in GML? Usually we know we're
dealing
with linear rings, by the context (i.e., drawing a polygon rather than
a
linestring, de-serializing a polygon and not a linestring, ...))<br>
</span><br>
---<o:p></o:p></p>
<pre>{ "type": "Polygon",<o:p></o:p></pre>
<pre> "coordinates": [<o:p></o:p></pre>
<pre> [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0]<span
style="color: silver;">, [100.0, 0.0]</span> ]<o:p></o:p></pre>
<pre> ]<o:p></o:p></pre>
<pre> }<o:p></o:p></pre>
<p class="MsoNormal">---<br>
<br>
rather than as follows:<br>
<br>
---<o:p></o:p></p>
<pre>{ "type": "Polygon",<o:p></o:p></pre>
<pre> "coordinates": [<o:p></o:p></pre>
<pre> [100.0, 0.0, 101.0, 0.0, 101.0, 1.0<span
style="color: silver;">, 100.0, 0.0</span>]<o:p></o:p></pre>
<pre> ]<o:p></o:p></pre>
<pre> }<o:p></o:p></pre>
<p class="MsoNormal">---<br>
<br>
I believe the latter would be lighter for browsers to parse. <br>
Of course the difference in speed would be unnoticeable for small
geometries,
but when it comes to geometries of thousands of points, that sort of
optimization might be worth taking into consideration.<br>
<br>
Still, congratulations for the 1.0 version!<br>
<br>
Best,<br>
Arnaud<br>
<br>
<br>
<br>
Sean Gillies wrote: <o:p></o:p></p>
<pre>I think we're done. If you all agree, let's talk about how to publish these<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a
href="http://zcologia.com/sgillies/hg/geojson-draft/file/tip/geojson-draft-6.txt">http://zcologia.com/sgillies/hg/geojson-draft/file/tip/geojson-draft-6.txt</a><o:p></o:p></pre>
<pre><a
href="http://zcologia.com/sgillies/hg/geojson-draft/file/tip/geojson-draft-6.html">http://zcologia.com/sgillies/hg/geojson-draft/file/tip/geojson-draft-6.html</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>(Perhaps with a CSS that isn't so blatantly copied from Dave Kuhlman's),<o:p></o:p></pre>
<pre>announcements, launch parties, etc.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Sean<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Geojson mailing list<o:p></o:p></pre>
<pre><a href="mailto:Geojson@lists.geojson.org">Geojson@lists.geojson.org</a><o:p></o:p></pre>
<pre><a
href="http://lists.geojson.org/listinfo.cgi/geojson-geojson.org">http://lists.geojson.org/listinfo.cgi/geojson-geojson.org</a><o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<p class="MsoNormal"><o:p> </o:p></p>
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