sir i am new to QGIS but having assginment to develop non commercial software for GIS analysis. i had finalised to work on QGIS but sir i am unable to build QGIS on windows7 and visual studio 10. i have tried from tutorials but i not able to resolve python import core module errorany help will be great waiting for ur invaluable support.
with regards KAMAL INDIA ----- Original Message ----- From: [email protected] To: [email protected] Sent: Thu, 6 Dec 2012 01:30:18 +0530 (IST) Subject: Qgis-developer Digest, Vol 86, Issue 12 Send Qgis-developer mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://lists.osgeo.org/mailman/listinfo/qgis-developer or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Qgis-developer digest..." Today's Topics: 1. Re: Fleet Management Tools (Vincent Picavet) 2. Where are the points? (Justin Hubbard) 3. Re: Fleet Management Tools (Petros Apotsos) 4. Re: Where are the points? (Ian Packham) ---------------------------------------------------------------------- Message: 1 Date: Wed, 5 Dec 2012 14:32:28 +0100 From: Vincent Picavet <[email protected]> To: [email protected] Cc: Petros Apotsos <[email protected]> Subject: Re: [Qgis-developer] Fleet Management Tools Message-ID: <[email protected]> Content-Type: Text/Plain; charset="utf-8" Hello, > Given a Point Cloud (either a file or a stream) that represents positions, > speed and direction of a vehicle fleet (TAXIs in my case), and a graph > (geometric network) that represents roads and intersections, I want to be > able to do the following: Your problem will probably be best answered through PostGIS queries, which you can then visualize with QGIS, and/or a custom web-based application. Let's say you have a table taxi_position like this, where position is a point geometry : | gid | taxi_id | speed | pos_time | position | > 1. Track down the route of any single vehicle, as a succession of > points on the network. Group by taxi_id, order by pos_time and make a line with the resulting points. > 2. Calculate the total passes of vehicles through any given point or > segment of the network. Join your segment (or node) network with your taxi_position table, allowing a tolerance around the segment/node (st_dwithin will do the trick), then group by taxi if you want to consider each vehicle only once. > 3. (Not as urgent as the above) Find the nearest TAXI to a random > point on the network. With PostGIS > 2.0, use KNN-search to do it fast as light. Otherwise, use st_dwithin with growing values for the search radius. > All of the above need to be FOSS-based solutions. check. > Although I am willing and ready to program plugins or algorithms to do the > above tasks, I am not really into re-inventing the wheel, so my questions > are the following: > A) Are there any libraries or plugins that handle the above tasks? > Is there any FOSS work already done with them? That would be a few SQL queries then. > B) Is QGIS ready (aka efficient enough) to handle those tasks, or > shall we try other tools/software? Use QGIS as visualization tool, and PostGIS as a backend, and you're set for hundred of millions of positions without problem (well, do not visualize everything at once). > Any opinions on my task would be greatly appreciated! You're welcome Vincent > Thanx in advance! > > Petros Apotsos > > Rural & Surveying Engineer > Technical Chamber of Greece Registry Number 96798 > ?: 2310 220345 > F: 2310 220346 > Ermou 18A, Postal Code 54624 > Thessaloniki, GREECE > > > > > __________ Information from ESET Smart Security, version of virus signature > database 7766 (20121205) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.com > > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer ------------------------------ Message: 2 Date: Wed, 5 Dec 2012 15:51:31 +0200 From: Justin Hubbard <[email protected]> To: qgis-developer <[email protected]> Subject: [Qgis-developer] Where are the points? Message-ID: <CAMFSZzpMzT6mqkqyZ0jUjZYJ2ywAf3NrTWeR8UQbgRD1H=p...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" In my plugin, I am able to create features as per the cookbook. And when I zoom to the layer extent I can see the points are there and they are rendered as per my symbology. However when I try to zoom / Pan to them, they disappear. If I run QgsFeature.isValid() they all return true. I just cannot understand it. -- Warm regards *Justin Hubbard* *--* *Justin Hubbard* Software Engineer and Support Mobile: +27 (0)79 827 1657 Fax: +27 (0)86 540 6016 Email: [email protected] <[email protected]> Web Site: www.pyrotechsoftware.co <http://www.plannermunicipalsoftware.co.za/>m -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20121205/7f3f4d79/attachment-0001.html> ------------------------------ Message: 3 Date: Wed, 5 Dec 2012 18:05:34 +0200 From: "Petros Apotsos" <[email protected]> To: <[email protected]>, <[email protected]> Subject: Re: [Qgis-developer] Fleet Management Tools Message-ID: <008901cdd302$6045e0c0$20d1a240$@com> Content-Type: text/plain; charset="UTF-8" Wow, a most prompt and to-the-point response!! I have absolutely no experience with PostGIS, but it was already in my priorities list, so I will get to it and post back with results and/or comments. I have to say I disagree with some points of your answers, but I have to do some work first, before posting a formal reply. Thank you again for your prompt and concise reply, Petros Apotsos Rural & Surveying Engineer Technical Chamber of Greece Registry Number 96798 ?: 2310 220345 F: 2310 220346 Ermou 18A, Postal Code 54624 Thessaloniki, GREECE Hello, > Given a Point Cloud (either a file or a stream) that represents > positions, speed and direction of a vehicle fleet (TAXIs in my case), > and a graph (geometric network) that represents roads and > intersections, I want to be able to do the following: Your problem will probably be best answered through PostGIS queries, which you can then visualize with QGIS, and/or a custom web-based application. Let's say you have a table taxi_position like this, where position is a point geometry : | gid | taxi_id | speed | pos_time | position | > 1. Track down the route of any single vehicle, as a succession of > points on the network. Group by taxi_id, order by pos_time and make a line with the resulting points. > 2. Calculate the total passes of vehicles through any given point or > segment of the network. Join your segment (or node) network with your taxi_position table, allowing a tolerance around the segment/node (st_dwithin will do the trick), then group by taxi if you want to consider each vehicle only once. > 3. (Not as urgent as the above) Find the nearest TAXI to a random > point on the network. With PostGIS > 2.0, use KNN-search to do it fast as light. Otherwise, use st_dwithin with growing values for the search radius. > All of the above need to be FOSS-based solutions. check. > Although I am willing and ready to program plugins or algorithms to do > the above tasks, I am not really into re-inventing the wheel, so my > questions are the following: > A) Are there any libraries or plugins that handle the above tasks? > Is there any FOSS work already done with them? That would be a few SQL queries then. > B) Is QGIS ready (aka efficient enough) to handle those tasks, or > shall we try other tools/software? Use QGIS as visualization tool, and PostGIS as a backend, and you're set for hundred of millions of positions without problem (well, do not visualize everything at once). > Any opinions on my task would be greatly appreciated! You're welcome Vincent > Thanx in advance! > > Petros Apotsos > > Rural & Surveying Engineer > Technical Chamber of Greece Registry Number 96798 > ?: 2310 220345 > F: 2310 220346 > Ermou 18A, Postal Code 54624 > Thessaloniki, GREECE > > > > > __________ Information from ESET Smart Security, version of virus > signature database 7766 (20121205) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.com > > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer __________ Information from ESET Smart Security, version of virus signature database 7766 (20121205) __________ The message was checked by ESET Smart Security. http://www.eset.com __________ Information from ESET Smart Security, version of virus signature database 7768 (20121205) __________ The message was checked by ESET Smart Security. http://www.eset.com ------------------------------ Message: 4 Date: Wed, 05 Dec 2012 18:35:32 GMT From: Ian Packham <[email protected]> To: Justin Hubbard <[email protected]> Cc: qgis-developer <[email protected]> Subject: Re: [Qgis-developer] Where are the points? Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" Justin Which version of QGIS are you using? Are you using code exactly as in the cookbook (Using Vector Layers chapter?)?. If not, can you provide the code? Also how did you create the symbology? Ian ----- Original Message ----- From: Justin Hubbard <[email protected]> Date: Wednesday, December 5, 2012 1:51 pm Subject: [Qgis-developer] Where are the points? To: qgis-developer <[email protected]> > In my plugin, I am able to create features as per the cookbook. And when I > zoom to the layer extent I can see the points are there and they are rendered > as per my symbology. > However when I try to zoom / Pan to them, they disappear. > If I run > QgsFeature.isValid() they all return true. I just cannot understand it. > > -- > Warm regards > Justin Hubbard > -------------- next part -------------- An HTML attachment was scrubbed... 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