<div dir="ltr">I also tried that and it works but it does not give me those two columns in my new table. There are only id and status inside.<br><br> <br>Am Dienstag, 25. November 2014 17:39:21 UTC+1 schrieb Brent Wood:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><div dir="ltr">as in my previous reply, I figured that would be useful...<br></div><div></div><div><span style="font-size:11pt" lang="EN-GB">WITH multis AS (</span></div><div><span style="font-size:11pt" lang="EN-GB"> SELECT id, status,<b> min(timestamp) as time_start, max(timestamp) as time_end, </b><span>ST_MakeLine( point_</span><span>geom ORDER BY timestamp</span><span>) </span>AS mylines</span></div><div><span style="font-size:11pt" lang="EN-GB"> FROM your_table</span></div><div style="text-indent:35.4pt"><span style="font-size:11pt" lang="EN-GB">GROUP BY id, status</span></div><div style="text-indent:35.4pt"><span style="font-size:11pt" lang="EN-GB">)</span></div><div><span style="font-size:11pt" lang="EN-GB"> </span></div><div><span style="font-size:11pt" lang="EN-GB">SELECT id, status, (ST_Dump(mylines)).geom</span></div><span style="font-size:11pt" lang="EN-GB">FROM multis</span>Brent Wood<br> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold">From:</span></b> Oliver Burgfeld <<a href="javascript:" target="_blank" gdf-obfuscated-mailto="uCjnawqMU8EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">oliver....@gmail.com</a>><br> <b><span style="font-weight:bold">To:</span></b> <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uCjnawqMU8EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">postgi...@googlegroups.com</a> <br><b><span style="font-weight:bold">Cc:</span></b> <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uCjnawqMU8EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">pcr...@pcreso.com</a>; <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uCjnawqMU8EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">postgi...@lists.osgeo.org</a>; <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uCjnawqMU8EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">postgi...@lists.osgeo.org</a>; <a href="javascript:" target="_blank" gdf-obfuscated-mailto="uCjnawqMU8EJ" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">remi...@gmail.com</a> <br> <b><span style="font-weight:bold">Sent:</span></b> Wednesday, November 26, 2014 5:10 AM<br> <b><span style="font-weight:bold">Subject:</span></b> Re: [postgis-users] Creating trajectory/lines from millions of points[PostGIS]<br> </font> </div> <div><br><div><div><div dir="ltr">Thank you and all the others who were answering :)<br clear="none"><br clear="none">I tried that and it seems that its working. Nevertheless I only tried it with a small part of my data (round about 1 million rows out of ~500 million) but if it's working now, it should also work with the whole dataset.<br clear="none"><br clear="none">Is there a way to also include the time_field into the result? I created a new table with this statement given but there are only two columns (vehicleid and status) included. <br clear="none">I know thats logical because I only included those two into my select clause but it would be great to not only order by time but also have a time column in my table.<br clear="none"><br clear="none">For example:<br clear="none"><br clear="none">vehicleid | status | time_start | time_end<br clear="none"><br clear="none"><br clear="none">I hope its understandable and not to mixed up...<br clear="none"><br clear="none">Thanks!<br clear="none"><br clear="none"><br clear="none">Am Dienstag, 25. November 2014 16:06:33 UTC+1 schrieb Rémi Cura:<blockquote style="margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Hey, a small correction :<br clear="none"></div>ST_MakeLine is already an aggregate, and you may want to enforce the order inside the aggregate (see at the end).<br clear="none"></div><div>Another interesting point is the possiblity to pu somehting in the M value of each point of the line, for instance the time.<br clear="none"></div><div>This comes very handy when you want to extrat parts of the lines.<br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div>So for instance for the first proposition :<br clear="none"><br clear="none"><div><span style="font-size:11pt" lang="EN-GB">WITH multis AS (</span></div><div><span style="font-size:11pt" lang="EN-GB"> SELECT id, status,<b> ST_MakeLine( point_</b><b>geom ORDER BY time_field) </b>AS mylines</span></div><div><span style="font-size:11pt" lang="EN-GB"> FROM your_table</span></div><div style="text-indent:35.4pt"><span style="font-size:11pt" lang="EN-GB">GROUP BY id, status</span></div><div style="text-indent:35.4pt"><span style="font-size:11pt" lang="EN-GB">)</span></div><div><span style="font-size:11pt" lang="EN-GB"> </span></div><div><span style="font-size:11pt" lang="EN-GB">SELECT id, status, (ST_Dump(mylines)).geom</span></div><span style="font-size:11pt" lang="EN-GB">FROM multis</span><br clear="none"><br clear="none"></div>Cheers,<br clear="none">Rémi-c<br clear="none"><div><div><br clear="none"></div></div></div><div><br clear="none"><div>2014-11-25 9:53 GMT+01:00 Brent Wood <span dir="ltr"><<a rel="nofollow" shape="rect">pcr...@pcreso.com</a>></span>:<br clear="none"><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><div><span></span></div><div dir="ltr">or automatically get the start & end times for each trackline in the record like this:<br clear="none"></div><div dir="ltr"><br clear="none"></div><div><span style="font-size:11.0pt" lang="EN-GB">WITH multis AS (</span></div><div dir="ltr"><span style="font-size:11.0pt" lang="EN-GB"> SELECT id, min(time_field) AS time_start, max(time_field) as time_end, status, ST_MakeLine(array_agg(point_ geom )) AS mylines</span></div><span></span><div><span style="font-size:11.0pt" lang="EN-GB"> FROM your_table</span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB">GROUP BY id, status</span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB">ORDER BY time_field</span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB">)</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB">SELECT id, status, (ST_Dump(mylines)).geom</span></div><div><span style="font-size:11.0pt" lang="EN-GB">FROM multis;</span></div><div><br clear="none"><span style="font-size:11.0pt" lang="EN-GB"></span></div><div><br clear="none"><span style="font-size:11.0pt" lang="EN-GB"></span></div><div dir="ltr"><span style="font-size:11.0pt" lang="EN-GB">Cheers,</span></div><div dir="ltr"><span style="font-size:11.0pt" lang="EN-GB"> Brent Wood<br clear="none"></span></div><div dir="ltr"> </div><div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div dir="ltr"> <hr size="1"> <font face="Arial"> <b><span style="font-weight:bold">From:</span></b> Hugues François <<a rel="nofollow" shape="rect">hugues....@irstea.fr</a>><br clear="none"> <b><span style="font-weight:bold">To:</span></b> PostGIS Users Discussion <<a rel="nofollow" shape="rect">postgi...@lists.osgeo.org</a> > <br clear="none"> <b><span style="font-weight:bold">Sent:</span></b> Tuesday, November 25, 2014 8:13 PM<br clear="none"> <b><span style="font-weight:bold">Subject:</span></b> Re: [postgis-users] Creating trajectory/lines from millions of points[PostGIS]<br clear="none"> </font> </div> <div><div><div><br clear="none"><div><div><div><div><span style="font-size:11.0pt">Hello,</span></div><div><span style="font-size:11.0pt"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB">In your case I would have try to make multilines for each taxi and each status (i.e. two multi by taxi) and then dump them into simple linestrings. All in a query that may look like this assuming you have a taxi id field:</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB">WITH multis AS (</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> SELECT id, status, ST_MakeLine(array_agg(point_ geom )) AS mylines</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> FROM your_table</span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB">GROUP BY id, status</span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB">ORDER BY time_field</span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB">)</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB">SELECT id, status, (ST_Dump(mylines)).geom</span></div><div><span style="font-size:11.0pt" lang="EN-GB">FROM multis</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB">You may want to add a time reference to your lines. To do this, you can add an extraction from your timestamp field (e.g. day or month) and add it into the WITH and to the group by clause.</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB">Hugues.</span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div style="text-indent:35.4pt"><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><span style="font-size:11.0pt" lang="EN-GB"> </span></div><div><b><span style="font-size:10.0pt">De :</span></b><span style="font-size:10.0pt"> <a rel="nofollow" shape="rect">postgis-us...@lists. osgeo.org</a> [mailto:<a rel="nofollow" shape="rect">postgis-us...@ lists.osgeo.org</a>] <b>De la part de</b> Oliver Burgfeld<br clear="none"><b>Envoyé :</b> mardi 25 novembre 2014 07:09<br clear="none"><b>À :</b> <a rel="nofollow" shape="rect">postgi...@lists.osgeo.org</a><br clear="none"><b>Objet :</b> [postgis-users] Creating trajectory/lines from millions of points[PostGIS]</span></div><div> </div><div><br clear="none"><br clear="none"></div><div><div><div><div>Hi,</div><div>I have millions of points in a PostGIS database containing taxi gps tracks. Now I want to create lines from these points by vehicleid and ordered by timestamp. But, and that's my problem right now, at first I want to include every column of my point table into the "line table" and I also need to intersect those lines at specific points.</div><div>I have one column representing the "taxi_is_occupied" status with 0 or 1. </div><div>What I want now is to create lines which are divided every time this status changes. In the end I need lines which show the path of every taxi over time, divided every time the status of the car changes so that I can query all lines where the taxi is occupied, for example.</div><div>What do I have to use therefore? I know that there is the ST_MakeLines tool existing in PostGIS, but as I am a new PostGIS user... I do not know exactly how to use it to get the results I need. </div><div> </div><div>Thanks a lot</div></div></div></div></div></div></div><br clear="none"></div></div><div>______________________________ _________________<br clear="none">postgis-users mailing list<br clear="none"><a rel="nofollow" shape="rect">postgi...@lists.osgeo.org</a><br clear="none"><a rel="nofollow" shape="rect" href="http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;">http://lists.osgeo.org/cgi- bin/mailman/listinfo/postgis- users</a></div><br clear="none"><br clear="none"></div> </div> </div> </div></div><br clear="none">______________________________ _________________<br clear="none">
postgis-users mailing list<br clear="none">
<a rel="nofollow" shape="rect">postgi...@lists.osgeo.org</a><div><br><br></div><div><br clear="none">
<a rel="nofollow" shape="rect" href="http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users" target="_blank" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;">http://lists.osgeo.org/cgi- bin/mailman/listinfo/postgis- users</a><br clear="none"></div></blockquote></div><div><br clear="none"></div></div><div>
</div></blockquote></div></div></div><br><br></div> </div> </div> </div></div></blockquote></div>