<div dir="ltr"><div><div><div><div><div>Hey,<br></div>I don't understand your problem.<br><br></div>If you have multilinestring, you need to break it to linestring with an id per multilinestring.<br></div>If you have linestring, you just need to keep an id for each line and an id per point (given in path).<br>
<br></div>Then you have several option to generate a ordered set of point (use the ORDER BY and the row_number() postgres function).<br><br></div>If you give some detailled example maybe we could help better.<br><br>Cheers,<br>
RĂ©mi-C<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-02-24 19:27 GMT+01:00 Stephen Woodbridge <span dir="ltr"><<a href="mailto:woodbri@swoodbridge.com" target="_blank">woodbri@swoodbridge.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On 2/24/2014 11:33 AM, Pedro Costa wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi guys,<br>
<br>
I'm trying to use lines from postgis to google maps android.<br>
To do that, I'm converting the lines to points with St_DumpPoints and,<br>
in gmaps, I make the lines. My problem is that I cannot create a correct<br>
sequence to order the points in android and so i get wrong lines (see ss<br>
atached). I'm already try to use st_dumpPoints path column and generate<br>
a serial but doesn't result.<br>
<br>
Anybody knows a solution to resolve that?<br>
</blockquote>
<br></div></div>
You probably need to write function that re-orients you lines before you dump them to points. The algorithm is like this:<br>
<br>
1. for the first edge, if the start point match the the start or end of the 2nd edge, if it does then st_reverse() the first edge.<br>
<br>
2. for the rest of the edges, if the edge point of the current edge matches the end point of the last edge, then st_reverse() the current edge.<br>
<br>
You might be able to st_union all the edges into one large edge and that should create a new reorder edge.<br>
<br>
No you can dump them and the order will be correct.<br>
<br>
-Steve<br>
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</blockquote></div><br></div>