Quantum GIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.
2
votes
1answer
108 views
QGIS rounds up the coordinates to six decimals when saving layer changes
I have the problem that when I create a new point (in a point layer) or a new line (in a line layer of course) and I save the changes to the layer (so NOT the project save) then QGIS rounds up the ...
11
votes
1answer
848 views
How to have a drop down list for feature editing (attributes) in Quantum GIS?
I'm editing a lot of polygons of a shapefile in QGIS and i need to classify them, so i have to write the classes a repetedly a lot of times. In ArcMap there is an option to have domains set for the ...
2
votes
1answer
58 views
Writing python plugin: How terminate plugin from script without closing QGIS?
I'm writing a QGIS conversion plugin in python to be able to create Obstacle-files for a model from shapefiles.
What I want to do now is just to close the plugin cleanly. This means, to close the ...
2
votes
1answer
53 views
How to see print commands through Python Script while programming plugin for QGIS?
This might sound like a silly question.
Is there a way that from running a custom plugin made for QGIS that a Python Shell can appear along when the plugin is run, like a debug screen. I'm asking ...
1
vote
1answer
22 views
Why are layers imported into a DB with Spatialite-Gui locked from editing?
I have a Spatialite DB which I have imported some shp files too using Spatialite-Gui.
I have full read-write access to these layers via the Spatialite-Gui, however when I open these layers from QGIS I ...
0
votes
2answers
69 views
Emergency Services: How to optimize routing by measured travel time?
I would like to optimize the service areas / catchment areas for an emergency service. Therefore, I have several measurement points on the streetmap, where people have stopped the travel time from ...
0
votes
1answer
32 views
How to find the watershed area for each point in the river network？
As title, I want to find the watershed area, but using QGIS.
I have following files to work with：
stream network shapefile(polyline)
point shapefile clipped from the polyline shapefile
I want to ...
1
vote
2answers
651 views
Clean way to install gdaltools plugin for QGIS on OSX
I have qgis 1.8.0 on osx mountain lion and am installing the gdaltools 1.2.29. I have run into a problem that a number of people are seeing. The plugin cannot find my gdal python (see below).
...
0
votes
1answer
43 views
qgis how to assign a field to map tips
I am a beginning user of QGIS 1.8. I cannot find the way to assign a field to 'map tips'. There seems to be no way in 'properties' of the layer to do so.
0
votes
1answer
50 views
PostGIS Manager Load Error
I am using the PostGIS Manager Load data to PostGIS tool on a Windows install and am getting the following error:
Something's wrong:
["'shp2pgsql' is not recognized as an internal or external ...
2
votes
4answers
169 views
Cannot fix QGIS after upgrade to Ubuntu 13.04 Raring
I have following problem. After upgrade to 13.04 I had problem with PyQGIS mentioned here.
I followed almost all advices described there, finally removed QGIS (had 1.8 Lisboa) and added the Ubuntugis ...
1
vote
1answer
49 views
Problem loading raster to PostGIS using QGIS
I am having trouble loading a raster (.asc) file to PostGIS 2.0.1 using the plugin Database - PostGIS Raster - Load raster to postgis in QGIS 1.8.0 on Win Vista 64 bit. I get the following error ...
7
votes
2answers
609 views
How can I create random points along a polyline in QGIS?
I am trying to create random points along a polyline shapefile in QGIS. Basically, like the 'random points' tool in 'research tools' but for polylines instead of polygons.
I have tried converting ...
0
votes
1answer
48 views
QGIS coordinates are very large
I've created a custom map in QGIS, with a few shapefiles. I'm using leaflet.js to render the map and the shapefile points and everything lines up correctly. The CRS is set to 4326.
When I export the ...
1
vote
1answer
22 views
Why does the Zonal Statistics tool always return 0?
I have a slope raster created from a DEM raster with the DEM Analysis tool.
Now, I would like to calculate the average slope in a given area represented by a vector polygon layer.
I thought I could ...
0
votes
1answer
37 views
gdalwarp cant find libproj.dlib
Thought I had finally got Python, gdal and QGIS to play nicely together but just tried to do a batch transform using a bash script to call gdalwarp and it claimed it couldn't read the libproj.dlib ...
5
votes
3answers
112 views
Examples of Animated maps
I am currently looking examples of animated maps. Creating animated maps with the help of this post and similar post checking Animaps site also
I am presenting this map in local school so those ...
0
votes
0answers
14 views
Loading raster from PostGIS DB into QGIS: succeeded yesterday, fails now
I have a PostgreSQL(v.9.2)/Postgis(v.2.0.3) database which includes raster layers (added through raster2pgsql).
To open them in QGIS (v.1.8.0-Lisboa), the "Add Postgis layer" menu will not work; ...
1
vote
2answers
40 views
How to select two points on a map using QGIS?
I need to select two points on a map in QGIS. I selected the element selection tool in menu view and I want to select two points. How can I accomplish this? Are there other tools or methods to ...
1
vote
1answer
71 views
How to dissolve polygons and aggregate their data in QGIS?
I have a shapefile (one layer) with my country but I have a problem.
It is divided into 4 entries (prefectures), and I want it as one, not 4.
Also, there is a table with some data, and I want to ...
0
votes
1answer
23 views
QGIS Python - Convert geometry from Postgres to QgsPoint()
I have made a query in Postgres to get some points to use with python.
This points are in geometry data. How can I convert that geometry in decimals to use QgsPoint() in python?
Thank you
1
vote
0answers
25 views
Having trouble with Webserver configuration on Windows
im currently working on a WMS with QGIS 1.8.0 Desktop with apache from xampp. What I want to do is to have my .qgs file displayed on my webpage as a OpenLayer. So I followed this tutorial:
...
0
votes
0answers
17 views
Adding a WMS - connection timed out?
I am trying to add a WMS service to qgis but am having some problems. After adding the url and name of the service and clicking on connect, I am receiving the following error message:-
"Could not ...
0
votes
0answers
22 views
Nearest neighbor analysis not showing results
I'm trying to do a nearest neighbour analysis on fish shoals distribution.
I go to Vector > Analysis Tools > Nearest neighbour analysis. I choose the appropriate layer and when I hit ok the black ...
1
vote
0answers
50 views
+50
spatialite.dll with Python and QGIS - the specified module could not be found
I'm having a bit of a nightmare getting to the bottom of this DLL loading problem. The stand alone script works absolutely fine but the exact same code does not work within QGIS.
import sys
from ...
3
votes
1answer
44 views
Splitting polylines according to coincident points with other polylines?
I'm looking for a method or python script to split polylines according to coincident points with other polylines, but avoid splitting the ones which just intersect (without a sharing point like the ...
0
votes
1answer
34 views
How to find the overlap of three polygons?
I have three polygon areas showing different land types and I want to create a new layer based on where the three layers overlap each other. I thought this was a subtraction query but havent been able ...
1
vote
0answers
61 views
Handling “bad layers” in QGIS version 1.9
I'm having a problem every time I try and open any project in qgis 1.9. It will load part of a few layers and then a yellow bar comes up across the top of the map area that says "Handle Bad layers: 23 ...
1
vote
0answers
19 views
travel survey multi stop routing problem
I have a travel diary survey dataset that I am attempting to transform into more useful information. Currently, the data comes in the format of:
Survey# , PlaceVisited#, TravelMode, TripPurpose, ...
3
votes
1answer
71 views
How can I programatically create and add features to a memory layer in QGIS 1.9?
I had a working plugin in QGIS 1.8 which read data from an MSAccess database and added it to a series of memory layers. There is some processing involved in the interim so I don't think simply using ...
6
votes
1answer
903 views
How to fill gaps in SLC-Off Landsat 7 ETM+ Images with QGIS?
Explanation of the problem:
On 31 May 2003 the Landsat 7 Enhanced Thematic Mapper (ETM+) sensor had a failure of the Scan Line Corrector (SLC). Since that time all Landsat ETM+ images have had ...
1
vote
1answer
57 views
Can I open a form in layer action?
I want to open a form (made in QTDesign) in the layer action. It is possible?
5
votes
2answers
280 views
How to create a 50x50 m hexagonal grid with mmqgis?
I'm trying to use the mmqgis plugin to create a hexagonal grid, and I am really perplexed on how to fill in the variables required. I would like to have hexagons around 50m x 50m in size (real life), ...
1
vote
1answer
50 views
How to create a Winkel-Tripel map of countries with different colors?
I need a good quality rasterized world map, Winkel-Tripel projection, in which all countries have different (random?) colors. No borders, text, grid or anything else on the map.
Is GIS the right way ...
-1
votes
0answers
28 views
problem with the upgrading of qgis and Lubuntu
I upgraded to Lubuntu 13.04 and to Qgis 1.9.
When I try to run the software I get this error message:
/usr/bin/qgis.bin: error while loading shared libraries: libgdal1.7.0.so.1: cannot open shared ...
14
votes
3answers
283 views
How to do kernel density estimation with a physical barrier/ boundary in QGIS?
Does anyone know of a programme that will allow kernelling that takes a boundary into account in its calculation rather than simply masking areas that are impossible?
So far I have found:
GME add on ...
0
votes
1answer
78 views
Aggregate points with same values to polygons
I have a shapefile with 2M measurement points (each measurement point has a resolution of a 1/10). How can I aggregate points around each other if and create polygons out of it?
They do not have to ...
2
votes
3answers
47 views
How to preserve text when converting from .dxf to .shp?
I have tried using dxf2shp converter in QGIS but the text in dxf file is being lost during the conversion process, despite selecting export text labels.
I would be grateful if someone can help me ...
0
votes
0answers
24 views
Spatialite, to speed performance, when should I create Views, Indexes or additional spatial tables?
I’ve got a large Spatialite database with a table of lines (roads, rail and water). I created a spatial index of the geometry to speed things up.
This works amazingly well when I’m zoomed in ...
0
votes
1answer
39 views
How to write an Advanced Query which gets the same results as the simple query option
Working with my data set on Late Woodland Village reanalysis in QGIS, the previous question was somewhat answered by defining the issue as a many to one. As a work-around, I summarized the info into ...
6
votes
1answer
116 views
How to address the new “Task-Completed” QgsMessageBar in Python?
I am really amazed what huge steps the QGIS development has taken in the last months. The new iconset, the improved Print composer and many more changes to be seen in QGIS 2.0 are really awesome!
...
3
votes
2answers
86 views
What Is The Ideal Workflow To Map (British) Postcode Territories
I'm looking for the best workflow for mapping postcodes and calculated territories, but being relatively new to mapping I'm struggling on a few details and also the best practices for displaying these ...
0
votes
0answers
24 views
How to hide annotation in QGIS in a organized way?
I don't understand how to hide (text) annotation in QGIS. I know I can do it simply with control+T but because many annotations are related with a specific layer I would like to organize them in a ...
0
votes
0answers
15 views
Calculating Centroid of add shaped polygons [duplicate]
I need to calculate the centroid so that it is still contained in the related polygon. I have used the centroid tool in ftools and the centroid maker and have the same results as shown below.
Is ...
2
votes
1answer
123 views
generate height data from DTED maps
I have 16 DTED maps of (1 degree x 1 degree). I have to generate combined height matrix of maximum 4 (1 degree x 1 degree) DTED maps in my C++ application.
Can someone suggest to me which open source ...
0
votes
0answers
17 views
QGis non blocking notifications with pyqgis [duplicate]
I'm searching for the way to use the new QGis non blocking notification system with the QGis python wrapper. I found informations on this fonctionnality but nothing on how to use this especially with ...
3
votes
2answers
69 views
Can the new Mapbox Vector Tiles be used as a QGIS basemap?
With the implementation of the mapbox vector tiles begs the question of how these could be used as a basemap in a QGIS printed map (assuming anyone cares about printed maps anymore!).
To use OSM data ...
0
votes
0answers
41 views
plugins available via WMS?
I have QGIS server up and running and all is well, and I want to create a plugin in PyQGIS. But I need the plugin to be available to the users of the web maps in which my server serves. So is it ...
5
votes
3answers
2k views
Why don't my Shapefiles and OSM data overlap in Quantum GIS?
So I'm pretty new to GIS, and I'm working on a mapping project using data for Vancouver, Canada. I want to combine Open Street Map data along with data provided by the City of Vancouver. But the City ...
1
vote
1answer
27 views
QGIS Field Calculation convert to ArcGIS
I have a field calculator expression I use in QGIS to generate unique IDs that are sequential, but start with a text string. I now need to perform the same thing in ArcGIS, but I am unsure of how to ...
