Re: [Qgis-user] network building tool
I've used a relational database with a table of nodes (with lat, lon) and a table of connections (from_node, to_node), then created a view to represent lines in well-known-text. Move a node and all the lines would move along with it since they're defined as a view. The line movement was not dynamic; it would require a pan/zoom/refresh in the web app as the graphics were rendered on the server (via Mapserver). This is exactly what I am looking for. But rather on the desktop than on a server. Maybe using the sqlite. Also, I was thinking to let the automatic updater just change update the last vertex once the network is created. See the following use case: 1) nodes are entered as assumed from geocoding 2) the connection lines are created by the described procedure 3) the lines are manually fine-tuned by adding vertices in order to move around settlements, bridges, barriers, etc. 4) then, stakeholder provide feedback on the correct placement of the nodes 5) the location of some nodes have to be shifted 6) then, the procedure would need to update the lines. In the ideal case, the line would just be updated after the last vertex in order to maintain the manual corrections on step (3). Thanks for the good discussion and regards. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] network building tool
So the solution I am dreaming of is: 1) prepare a point vector layer with all nodes having unique IDs (e.g. Paris, Madrid, Berlin) 2) have a table where all connecting lines are listed: LINE_NAME, LINE_START, LINE_END big tube , Paris, , Berlin big tube2 , Madrid,, Berlin big tube2 , Madrid,, Paris Then, a procedure would read the connections from the table and draw automatically these connecting lines between the nodes. If you want straight lines between nodes, it is easy. Otherwise you would have to state rules for making the lines between the nodes, and it can be simple or very complicated to automate according to the rules. See my workflow in: http://thread.gmane.org/gmane.comp.gis.qgis.user/24511/focus=24527 Here is a PostGIS example of creating the edge geometry given to/from nodes : https://gist.github.com/vpicavet/7572293 Do you think that this could be done as well with non-server based storage (shapefile, sqlite/spatialite)? This behaviour is transparent for a visualization client, QGIS for exemple. Great. give me some time to test on it. Thanks for your follow-up. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] network building tool
Have you given a look at FlowMapper plugin? http://plugins.qgis.org/plugins/FlowMapper/ The issue with flowmap is that it's designed for a limited number of flows: * the matrix must always have the same dimensions as the listed nodes * the order of matrix and nodes must be the same * even if is set the flow volume to 1, focus is on the flow and not the line type ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] network building tool
Dear list, I am looking for a tool or plugin that could help me building the basis for an infrastructure network (e.g. eletrical grids, gas or water piping network, etc.). The areas I am working do usually not have a good topographic mapping basis and no infrastructure. Usually, I would have the coordinates of the nodes (e.g. substations or pumping stations) as a result from a survey or data gathering from a provider. In a next step, I would need to build a network. This be all done manually: 1) digitise the nodes 2) digitise the lines interconnecting the nodes depending on charateristics (e.g. tube diameter, drinking water or grey water) Now the difficulty is when a node was digitised wrongly or needs to be corrected, all lines connecting to this node would need to be changed. So the solution I am dreaming of is: 1) prepare a point vector layer with all nodes having unique IDs (e.g. Paris, Madrid, Berlin) 2) have a table where all connecting lines are listed: LINE_NAME, LINE_START, LINE_END big tube , Paris, , Berlin big tube2 , Madrid,, Berlin big tube2 , Madrid,, Paris Then, a procedure would read the connections from the table and draw automatically these connecting lines between the nodes. These could then slightly adjusted manually be adding more vertices or alike. But the procedure would easy up the effort of building the network. And in the ideal case, it would also take care of updating the lines if a node is shifted on the map. (Similar to a connector line in an Openoffice Impress drawing) The closes tool I found so far is the https://plugins.qgis.org/plugins/FlowMapper/ But I think it's too complicated for my purpose. I would really appreciate to receive any pointers or suggestions. Thanks a lot in advance, Kind regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] network building tool
Graphviz (http://www.graphviz.org/) will do most of what you described, but I don't think you can specify the coordinates of the nodes (that would be nice) so the result is just a diagram, not a map . Not exactly. Via Representation of network flows / http://gis.stackexchange.com/questions/778/representation-of-network-flows I found JFlowMap. It uses the approach I described: https://code.google.com/p/jflowmap/wiki/HowToPrepareData I just don't know if it can also export to shape... [question off-list:] do you mean something that just draw the lines or that will create/manage actual line features? A line drawing tool which would allow to maintain connections of lines if nodes are shifted. The background for all is that the simlation and design tools for networks can export lines (e.g. power lines, telecom lines) or nodes as lists but no logical structure. A typical schema: http://en.wikipedia.org/wiki/File:Electricity_Grid_Schematic_English.svg http://en.wikipedia.org/wiki/File:One-line_diagram.svg So I wonder how others are transferring such information into the GIS/geo domain. Regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] map composer: cannot set portrait
That said, You need to change your Map item scale in the main properties or it's extent. I was expecting that it gets the extend from the QGIS main window. Obrigado. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] map composer: cannot set portrait (extend in map composer)
That said, You need to change your Map item scale in the main properties or it's extent. I was expecting that it gets the extend from the QGIS main window. Let's say use Natural Earth (World data set) and then I zoom to Brazil. Below in the main window, I can then copy the extend. What I miss is a option/button: * copy extend from QGIS main window or * a field where I could paste the copied extend string from the status bar of the main window Instead, the map item requries: X-min: Y-min X-max: Y-max: Each one in an extra column Did I overlook something? Does this functionality already exist? Thanks a lot in advance, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] map composer: cannot set portrait (extend in map composer)
You can just use the set extents button. Thanks for the patient answer. It does not work in my case because it assumes that the map that shall be fitted into the item frame covers the whole QGIS main window. But in my case I have a single tif raster file which leaves a white space left and right to it towards the window borders. This is not taking into account by the extends buttons. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] map composer: cannot set portrait
Hello, using map composer with Ubuntu 13.04. QGIS 2.1 (latest). I change my page to A3-portrait. But after that, I cannot see any change in the map composer window. I would like to compose a map with a more upright dimension. Think of a shape similar to France or Germany. What needs to be changed? Would anyone share a template for me to try out? Thanks and regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Ubuntu: QGIS 1.9 GRASS plugin
Hello, from the qis.org repository ( http://qgis.org/debian) I can install packages for QGIS (currently version 1.9.) and the respective GRASS plugin. But upon activation the program tells me that the plugin is not compatible. Could someone please show me how to get both working well together? Thanks and regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Ubuntu: QGIS 1.9 GRASS plugin
But upon activation the program tells me that the plugin is not compatible. This is the actual error message: Incompatible library version for module. You need to rebuild GRASS or untangle multiple installations. This is what's installed: dpkg -l|grep qgis rc libqgis1.7.4 1.7.4-2~precise5 amd64Quantum GIS - shared libraries rc libqgis1.8.0 1.8.0-2~raring1 amd64Quantum GIS - shared libraries ii libqgis1.9.0 1.9.0+git20130707+42a3e38~raring1amd64QGIS - shared libraries ii python-qgis 1.9.0+git20130707+42a3e38~raring1amd64Python bindings to QGIS ii python-qgis-common 1.9.0+git20130707+42a3e38~raring1all Python bindings to QGIS - architecture-independent files ii qgis 1.9.0+git20130707+42a3e38~raring1amd64Geographic Information System (GIS) ii qgis-common 1.9.0+git20130707+42a3e38~raring1all QGIS - architecture-independent data ii qgis-plugin-globe 1.9.0+git20130707+42a3e38~raring1amd64OSG globe plugin for QGIS ii qgis-plugin-globe-common 1.9.0+git20130707+42a3e38~raring1all OSG GLOBE plugin for QGIS - architecture-independent data ii qgis-plugin-grass 1.9.0+git20130707+42a3e38~raring1amd64GRASS plugin for QGIS ii qgis-plugin-grass-common 1.9.0+git20130707+42a3e38~raring1all GRASS plugin for QGIS - architecture-independent data ii qgis-providers 1.9.0+git20130707+42a3e38~raring1amd64collection of data providers to QGIS ii qgis-providers-common 1.9.0+git20130707+42a3e38~raring1all collection of data providers to QGIS - architecture-independent files rc qgis-sqlanywhere 1.9.0+git20130704+630427f~raring1amd64QGIS sql anywhere plugin and provider ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Ubuntu: QGIS 1.9 GRASS plugin
Incompatible library version for module. You need to rebuild GRASS or untangle multiple installations. this is correct. You need to recompile QGIS with support for GRASS(64x). OK, but isn't this the idea of the PPA? To have the buildbot doing this for us? ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] NoData on GRASS Raster
In GRASS maps itself the NoData, i.e. null(), cells are left transparet. In QGis these are shown with the colour of the most inferior class. How can I get them to be transparent? any idea where I should look at? I files a bug here: http://hub.qgis.org/issues/7516 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] NoData on GRASS Raster
In GRASS maps itself the NoData, i.e. null(), cells are left transparet. In QGis these are shown with the colour of the most inferior class. How can I get them to be transparent? any idea where I should look at? Thanks. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] comments on qgis-grass plugin?
Hello, where do you discuss comments/observations on the GRASS plugin? Here or in grass-dev list? Regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Comment on the hand book
Hello, please improve the explanantion of the topological editing function in the hand book. I spent 90 min. to find out how this works because I was used the arc* way. Not your fault, but two pictures could help. BTW, would it be possible to publish the handbook as well as HTML? Thanks for the efforts and regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: comments on qgis-grass plugin?
If it's with how the function works then grass. If it has to do with the QGIS plugin interface to the tool or the tool not working in QGIS then OK: I tried to do raster calculations with the plugin. the r.mapcalc module in the plugin resembles a model builder. Very intuative. BUT: The process boxes (e.g. a operator rectangle) keep sticking at the mouse. once the box is placed, i cannot change the cursor function to connect the boxes. Hope that this comes clear somehow. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Comment on the hand book
Hi Tim, The beauty of the Qgis manual is that it is also open source, so if you have some suggestions for improvement, please feel free to share them with the list. Now that you're an expert on topological editing, why not share your expertise by suggesting some changes to that section of the manual? Thanks. But due to other stuff (in parts also contribution to other FOSS projects) I will hardly find time for this in the next 2 months. I could file a bugreport in order not to let this be foregotten. If you wanted to email updates for that section to the list, I'm sure someone would be happy to incorporate the changes, or better yet, if you are familiar with LaTeX, you could check out the source and submit a patch yourself. As for the HTML manual, I think there are several people already working on it... I donno what tool you use. but elyxer seem to give good tex to html conversion results. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: GRASS QGIS module list
I've started to add color coding to the wiki page. I did just a few entries to see how it looks. Very cool. But don't we want to have this created automatically somehow? ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Announcing Time Manager Plugin v 0.1
Hello, a very nice plugin. Thanks for providing it! I have two questions: The aim of Time Manager plugin is to provide comfortable browsing through temporal geodata. A dock widget provides a time slider and a configuration dialog for management of your layers. How do I use this with aggregated data: e.g. a data set of monthly averages of rainfall created from 20 years of data? So my data set contains an average value for each month of the year but no fixed date. How does this work with netCDF? QGIS had some problems with these 4D-ready data sets. See some related threads here: * Support of 4D (time based) data sets http://osgeo-org.1803224.n2.nabble.com/Support-of-4D-time-based-data-sets-td5505747.html * NetCDF Data in GRASS? http://osgeo-org.1803224.n2.nabble.com/NetCDF-Data-in-GRASS-td5506213.html * using GDAL to view netcdf files in GRASS http://osgeo-org.1803224.n2.nabble.com/using-GDAL-to-view-netcdf-files-in-GRASS-td4090243.html Kind regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: offline googlemaps (or the like) images
if you get your own imagery you can easily install a wms server on your machine and connect to it with qgis. Look also at featureserver. T ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
if you mean that arc* does raster reprojection I believe we all know that is true as it is also true that at the moment QGIS doesn't reproject on-the fly rasters. I believe also that this feature is on the QGIS roadmap. Any idea who this support will be or where I could find more information? ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: Reproject WMS
* Why not use the vector in WGS84? my result map needs to be published projected * I first load the vector in arc and then the WMS tile. Then do all your work in WGS84 and just before publication, reproject your result maps with the Raster - Projection tool of QGIS (which is a wrapper to the gdalwarp command). I think not the user should adapt to the software but vice-versa! Nearly all maps on the world prepared for interchange with authorities have some sort of projected SRS while most WMS deliver ggr. / WGS84. So you don't wanna always spend time for reprojecting but rather do the actual work. Anyway, thanks for the answer. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: GRASS permission issue
Hello, I have also run into this issue: http://thread.gmane.org/gmane.comp.gis.grass.user/31096 /media/Docs is a automatically mounted partition every time i startup the computer. Do you know how I can check if I'm fully authorized on it ? I don't remember any similar issue with it but it could be related. As it seems to occuring over and over, I think this is a relict from the early days of computing. To my opinion there is no need to think that the GRASS users are by default concurrently working on the same location. This may have been true in old days where many people where sharing mainframes or today in server environments. Nowdays, desktops and notebooks are cheap. We are mostly using GRASS like GIMP or Office programs: one person at one single computer. Thus the following defaults may be revised: * requiering the user to be the _owner_ or the files on linux/unix systems: * many users use shared partitions between windows and linux and automount these * also on linux systems the one-user-one-computer is getting common * working with having GRASSDATADIR on an external large drive is difficult * let users write on more than one mapset * again, concurrent use of a location is rather rare * this would help to get a file sorting function in order to clean up the GRASSDIR once in a while (add a command g.move, http://trac.osgeo.org/grass/ticket/891) * sharing information with between mapsets/locations instead of replication saves disk space (http://thread.gmane.org/gmane.comp.gis.grass.user/30333) this is currently not possible I know that some of the old cats or power users with _very special_ needs like server processing setups will be against a change which affects the permissions/rights situation and capabilities of GRASS. But please consider that such capabilities could still be maintained on a non-default basis as compile options. And the general public certainly wants an easy to use system where such pecularities like permissions are important. Be reminded that GRASS on Windows (focus of current release cycle) does not know such rights at all. I hope for an open discussion and helpful feedback, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] gpg keys for Ubuntu PPA packages
Hello, where can I find the keys for the packages in Launchpad PPA for Ubuntu that are advertised at: http://download.qgis.org/downloads.rhtml? The updates cannot be installed without the keys here. Thanks for your help in advance. Regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] associate timeseries data with point (layer)
Hello, often, geographical data has a time component. Some examples: * timeseries of water levels at rain gauges within a catchment area * development of a population in a town Is there already a plugin in place which lets the users associate such type of feature data to a geographic feature such as a point (showing the location of the rain gauge or the city)? I am not talking of the normal GIS attribute table because these refer to the geographic attribute data. they normally do not contain a time component (4 dimesion). Do you have any ideas? Kind regdards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] raster legends/color tables?
Hello, is it possible to display the values of a raster color table among with their colors in QGIS? In the offical screenshot one cannot find such a functionality: http://qgis.org/images/screenshots/linux2.png Kind regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] editing dbf files
Try the shapelib programs: They include dbfdump, a simple utility to extract the contents of a dbf to a text file, From here they can pretty easily be edited directly or loaded into a database such as Postgres or Mysql for updating. see http://shapelib.maptools.org/shapelib-tools.html#dbfdump You can then use the dbfcreate progranm to create a new dbf file to contain the edited records the dbfadd program to iterate through your new data to load the records. Please check also this thread here:http://thread.gmane.org/gmane.comp.gis.freegis/2193 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Ubuntu Version 0.11 has some defects
Hello, yesterday my QGIS installation from http://ppa.launchpad.net/qgis/ubuntu/ got updated. I observed some issues: * The documentation () was not installed * The plug-in manager only allows to use native QGIS plugins: - only plugins from /usr/lib/qgis can be selected in the plugin-manager - I cannot add new repositories, the menu item is not there. - I cannot use plugins from ~/.qgis/python/plugins installed as described in http://www.geog.uvic.ca/spar/carson/installplugins.html below. The are just not present in the plugin-manager for activation. Kind regards, Timmie ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
