Re: [Qgis-user] how does QGIS generate the EPSG from a Shapefile?
Oi Rodrigo, Can you run ogrinfo in the command line? Like: ogrinfo -al -so yourshape.shp This will tell you the CRS detected by ogr. ogr (and QGIS) uses the *.prj file. But there are known problems with the WKT representation of CRS. Sometimes it is hard to know if two different strings represents the same EPSG code. For that reason, QGIS also writes and additional *.qpj. When it is present, QGIS uses this textual representation to compare it against its database and it always work. But if you just have the *.prj along with the shapefile, both ogr and QGIS might fail to detect the exact CRS. Please share one *.prj that ogr fails to associate with a known EPSG. Abraço, Jorge Às 13:27 de 25/10/18, Rodrigo Mariano escreveu: > Hello everyone, > > I would like to know: how does QGIS generate the EPSG from a Shapefile? > > I ask this question, because I'm trying to upload a Shapefile by OGR, > but the OGR doesn't > insert the correct EPSG. So I need always open the Shapefile in QGIS to > discover the > EPSG before uploading it with OGR. > > Thanks in advance. > > Best Regards, > > Rodrigo > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user J. Gustavo -- Jorge Gustavo Rocha Departamento de Informática Universidade do Minho 4710-057 Braga Tel: +351 253604480 Fax: +351 253604471 Móvel: +351 910333888 skype: nabocudnosor ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] 3d color ramp
Hi everbody! I would like to know if exist a way to use a categorized color ramp (like normal visualization) by using the new 3d viewer in Qgis 3.2 Kind regards Emanuele Mele ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [QGIS-it-user] Importare stili di ArcGIS in QGIS
Ciao Carlo, sni. Dipende da quanto complesse sono le tue simbologie. Qui, nel canale youtube di Totò Fiandaca, trovi un video che può aiutarti https://www.youtube.com/watch?v=kfjsa_Jb6u4=3=0s=PLqDFjeQq7NBhCAsALWJOoMu7pdom14D55 L'idea comunque è di passare attraverso il formato SLD e di importarlo su QGIS e da lì poi eventualmente risalvarlo nel formato di QGIS. Esiste se no un'estensione per ArcGIS sviluppata da Geocat che fa questo lavoro, ma anche lì se le simbologie sono troppo complesse non ce la fa ( https://www.geocat.net/it/home/bridge/) Federico Il giorno gio 25 ott 2018 alle ore 16:18 Carlo Nardi ha scritto: > Ciao a tutti > > Per esigenze lavorative dovrei importare degli stili creati in ArcGIS > all'interno di QGIS. > E' possibile farlo e con quali estensione salvare lo stile? > > Grazie > Carlo > ___ > QGIS-it-user mailing list > QGIS-it-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/qgis-it-user > ___ QGIS-it-user mailing list QGIS-it-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/qgis-it-user
[QGIS-it-user] Importare stili di ArcGIS in QGIS
Ciao a tutti Per esigenze lavorative dovrei importare degli stili creati in ArcGIS all'interno di QGIS.E' possibile farlo e con quali estensione salvare lo stile? GrazieCarlo___ QGIS-it-user mailing list QGIS-it-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/qgis-it-user
Re: [Qgis-user] how does QGIS generate the EPSG from a Shapefile?
Am 25.10.18 um 16:00 schrieb ralfwessels: Hi Rodrigo, Only if the shapefiles contain a prj-file (with the right informations about the coordinate system) QGIS opens it automatically correct. Not necessarily with the correct EPSG code. If there are several EPSG codes with (almost) similar parameters, QGIS takes the first it finds. Especially EPSG:3857 is a candidate for false detection. If the shapefile was created with QGIS, it has a .qpj file with the EPSG code number stored inside. If the shapefile was created with some other software, QGIS has to guess. Greetings, andre Joost ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] how does QGIS generate the EPSG from a Shapefile?
Hi Rodrigo, Only if the shapefiles contain a prj-file (with the right informations about the coordinate system) QGIS opens it automatically correct. If you use shapefiles with OGR you either need to specify the EPSG Code like ogr2ogr -a_srs EPSG:2066 output.shp input.shp or - if you have - the prf-file like ogr2ogr -a_srs input.prj output.shp input.shp -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] how does QGIS generate the EPSG from a Shapefile?
As far as I know, qgis cannot discover it. If the shapefile is missing the projection info, it will either: 1. Ask you to select it 2. Select the one your current map is set to 3. Select a predefined epsg depending on your settings. If your settings are 2. or 3. you might not notice this, and think qgis is selecting the right one for you. On 25-10-18 14:27, Rodrigo Mariano wrote: Hello everyone, I would like to know: how does QGIS generate the EPSG from a Shapefile? I ask this question, because I'm trying to upload a Shapefile by OGR, but the OGR doesn't insert the correct EPSG. So I need always open the Shapefile in QGIS to discover the EPSG before uploading it with OGR. Thanks in advance. Best Regards, Rodrigo ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] how does QGIS generate the EPSG from a Shapefile?
Hello everyone, I would like to know: how does QGIS generate the EPSG from a Shapefile? I ask this question, because I'm trying to upload a Shapefile by OGR, but the OGR doesn't insert the correct EPSG. So I need always open the Shapefile in QGIS to discover the EPSG before uploading it with OGR. Thanks in advance. Best Regards, Rodrigo ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] QGIS Live GPS Tracking Settings (QGIS 2.14)
Hi Malhar,
I'm currently looking to fund a QGIS developer to add the ability to
(optionally) save the GPS timestamp along with the point feature.
If you also have work you'd like done in the GPS panel, I think we could
perhaps save costs by collaborating on a single upgrade for all our desired
functionality? Please contact me if you are interested.
Note that you can sort of achieve your goals by recording the GPS data directly
into a database (rather than a shapefile or non-RDBMS dataset). Then plot the
data from this table instead of using the live GPS display.
You can then open a layer which has a SQL something like:
select * from table where timestamp > now - interval('10 minutes');
Then use the capability described here for that layer:
https://github.com/qgis/QGIS-Documentation/issues/1683
This gives you the last 10 minutes data - or any interval you want, refreshed
automatically as required
To use an SVG symbol such as an airplane for the current position, you can
create a new point layer with a query like:
select * from table where timestamp = (select max(timestamp) from table);
This will always return just the latest point feature... and if the timestamp
is indexed, it can do it pretty quickly.
Assign a suitable airplane symbol to the layer and set this layer also to
redraw automatically.
Then assign the label for this point layer to be built up as a string with
deg/dec min, then the latest position will always be written on the map in the
format you want.
This would work with any of the 3 main open source spatial SQL databases
(Postgis, MySQL/MariaDB/Spatialite) as it uses very standard SQL statements. I
have done similar things in the past with Postgis & Spatialite.
A lot of these sorts of issues can be treated as layers plotting subsets of
data filtered & reformatted as required - so they become data management
problems rather than live GPS data problems, and normal database functionality
can be used to provide the required capabilities.
Hope this helps!!
Brent Wood
Programme leader: Environmental Information Delivery
NIWA
DDI: +64 (4) 3860529
[cid:image23e6c9.PNG@6908ca10.46bab324]
Brent Wood
Principal Technician - GIS and Spatial Data Management
Programme Leader - Environmental Information Delivery
T +64-4-386-0529
National Institute of Water & Atmospheric Research Ltd (NIWA)
301 Evans Bay Parade, Greta Point, Wellington
Connect with NIWA: niwa.co.nz
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From: Qgis-user on behalf of Phil Wyatt
Sent: Thursday, October 25, 2018 13:25
To: 'malhar'; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS Live GPS Tracking Settings (QGIS 2.14)
Hi Malhar,
No, I don’t believe there are any ways to edit the GPS information as per your
requests. If these features are a high priority for you then maybe consider
supporting a developer to make some changes to the base code to allow changes
to the GPS and the trail. I suspect Lat/Lon is the standard for most GPS’s but
again a developer may be able to set options for other NMEA sentences.
Cheers - Phil
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of malhar
Sent: Wednesday, 24 October 2018 11:26 PM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] QGIS Live GPS Tracking Settings (QGIS 2.14)
Hello all,
I am currently using the QGIS (2.14) live GPS tracker for a project. I have a
few questions regarding the settings for the live tracking feature.
1) Is there a way to change the latitude and longitude units from decimal
degrees to degrees and decimal minutes in the "GPS Information Panel?"
2) Is there a way to change the symbol of a cross within a circle to an
airplane?
3) Is there a way to change the trail of the aircraft so it only shows the
previous 10 minutes of flight, yet have the log file show the entire flight
route?
Thank you very much for your help.
Sincerely,
Malhar
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