QGIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.

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55 views

Is there a QGIS plugin that can transform tabular data to graph?

I have a CSV file with water level measurments in a well, taken once a year for 40 years. Is there a way to show this data as a graph (x axis being the date and y axis the water level) in QGIS?
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50 views

How to set attribute to selected field?

I am trying to create a temporary point layer in memory using the following python code. # create layer vl = QgsVectorLayer("Point", "temporary_points", "memory") pr = vl.dataProvider() # add fields ...
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1answer
66 views

How to create heatmaps with small radius?

I am trying to visualize a set of pois on a map with the qgis heatmap plugin. It works great with a big radius but the layer is invisible for a small one (around 100 meters). I really need a small ...
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1answer
321 views

Filter MapComposer legend to only show layers visible on the map

I have written a function in Python / PyQGIS (no standalone application, so copy/paste it to the Python console editor to run it) that takes a VectorLayer as argument, creates a MapRenderer object for ...
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1answer
162 views

Using QGIS and PostGIS for multi-user capabilities, similar to ArcSDE for ArcGIS [duplicate]

I have previously used ArcSDE technology with Microsoft SQL Server to allow for multi-user database editing. My ESRI licenses have recently ran out and I have been using QGIS for my GIS work. I am ...
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1answer
77 views

Creating Map from database

I'd like some general advice on creating dynamic maps. I have a bunch of geospatial points saved on SQL Server and PostgreSQL. People will enter new data into the databases from time to time. I want ...
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2answers
57 views

How does QGIS Identify Features plugin work i.e. what is logic behind it?

I'm new to QGIS and python as well. I need attributes and their values of a selected vector layer, in the similar manner as Identify Feature works only difference is I don't wish to show them in a ...
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1answer
93 views

dealing with geometry that should be geography (bad coordinates)

I'm working on a project with a few publicly available datasets. One of them is from the USGS, it's their prediction of peak ground acceleration in 50 years. Here's a link, and here's what it looks ...
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150 views

qgis2leaf plugin & data defined properties style

I exported a map with data defined properties style from qgis2leaf, but it doesn't appear like the following map. Only dots appears on the openlayers map. Is it possible to visualize this kind of syle ...
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1answer
113 views

CRS of QGIS bounding boxes

I used QGIS to find the extents/bounding boxes of a list of features from census data. I used the following method: Vector - Research tools - Polygon From Layer Extent, which creates a new shapefile ...
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1answer
26 views

Is there a way to use old Print composer templates in 2.0?

As the title says, the old templates do not work in 2.0. It started with having to redraw boxes, now it causes it to crash completely. Is there an easy fix. Can i download templates for use??
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42 views

Any consideration of moving QGIS project file to SQLITE form XML? [closed]

Just curious, has anyone ever proposed storing the ".qgs" project file in SQLITE instead of XML? Seems like it might be faster, easier to parse, and you could hide the changes behind an API. But I ...
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1answer
47 views

Is it possible to create one raster elevation layer from two different point layers in QGIS?

I have two layers with X,Y,Z data. The data overlay only partly. Is it possible to create one raster layer with elevation data using the 2 sets of data but without merging them first?
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3answers
141 views

What Open Source Packages are available to provide routing

I am looking for ways to validate mileage charged by our contractors. They are paid from a central location to a customer, and then from the customer to a drop off location. I use QGIS for a bunch ...
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1answer
115 views

How to set image size with Image Map Plugin on QGIS 2.4?

I use QGIS 2.4, but I have noticed that the "Set Map/Image Size" feature on the HTML Image Map Plugin no longer seems to work. No matter what you set the "Set Map/Image Size" for, your image will ...
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1answer
38 views

Not empty geometry having blank text

i'm having problem with geometry column, for some rows i have geometry with blank text, this query will describe more the problem : select geom, ST_AsGeoJSON(geom), ST_Isvalid(geom), ST_IsEmpty(geom) ...
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1answer
37 views

qgis printcomposer: can I wrap text in attr table?

I have some longish text attributes and when I try and put these on the map using the attribute table they get truncated. Is there a way to get these long lines wrapped.
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2answers
131 views

Tool for rendering/drawing maps from coordinates

What tools can be used to convert a set of coordinates into polygons? For example: this code represents a room by providing information about it's four corners. <node id='-202' lat='41.015146' ...
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219 views

QGIS: Multiply Raster Value with Pixel size

i'm working on a map with population densities. My raster data contains values as [People/square meter] for each cell. I have per capita values of energy demand etc. which I want to multiply with the ...
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1answer
148 views

Process to georeference corners of vector file?

I am new to QGIS and trying to wrap my arms around it so please bear with me. I have vector files (DXF) that I need to add back in the georeferencing. They were edited with Illustrator so I loose ...
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1answer
70 views

Update OSM data already imported in qGIS

qGIS makes it really straightforward to import data from Open Street Map (there's a good tutorial here). However, despite this process is relatively straightforward, it takes some time to download the ...
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2answers
292 views

Is it possible to embed a Qgis map with all the information I added, in my website?

I am not a cartographer or geography student. I work in a network organization for developmental policy and I need a good software which enables me to record the cities in which our members work on a ...
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1answer
241 views

Issue using Matplotlib in QGIS

I am developing a QGIS-plugin and for graphing I want to use matplotlib, like many other QGIS -plugins. This worked fine under linux, but under windows with QGIS2.4 I am experiencing problems. I ...
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1answer
173 views

Point cloud LiDAR

I have been trying to grid a point cloud, version1.2, LiDAR datasets which are intended to be used for hydraulic simulation of flood propagation. Already, I have used Arc* to work on the traditional ...
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1answer
318 views

Raster and vector layer in the same CRS don't match

While adding multiple raster and vector layers (and setting them all in CRS WGS84) in QGIS 2.2, they don't seem to overlap. Interestingly enough, only raster files overlap between each other, the same ...
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205 views

distance difference in Google Earth with exported GPX or KML compared to source shapefile

I've converted a shapefile (points) to KML with QGIS. Points in the shapefile are within 100m distance from each other. When I measure it in Google Earth, the distance changes to 80m. The same ...
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1answer
304 views

Replacing PyQt4 with PySide with standalone QGIS

I would like to develop an application using the QGIS libraries and PySide instead of PyQt4 due to more flexible licencing, I wonder if this is possible. I downloaded PySide and replaced my ...
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1answer
50 views

Count points in a polygon that changes form (“on the fly calculation”)

I have tried to find a plugin for this, with no luck. Perhaps someone knows of a plugin that can do the following: In this project I create a lot of polygons that contain points, and the size of the ...
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1answer
62 views

QGIS processing does not support jpg

I would like to work with the gdal functions provided in the processing toolbox. It is easy to call: import processing processing.alglist() ...
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1answer
216 views

DXF (points and lines) in QGIS - Doesnt import z coordinates

Trying to get to grips with QGIS, coming from a Mapinfo and Civil3D background. I have a DXF file with points (X,Y,Z) and lines. I want to open this in QGIS and use the interpolate plugin to create ...
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1answer
351 views

Using Union on multiple shapefiles to output single result

Using QGIS 2.2 and Python, I would like to use the Union algorithm on multiple shapefiles (contained in a folder TEST) which would then produce single shapefile containing all the data. Currently ...
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1answer
271 views

Best Resampling Method for DEM reprojection in QGis

I need to reproject a DEM (aster file) in order to have the same CRS as all my other project data - I have different SHP for the same DEM's location but they have a different CRS. Which resampling ...
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1answer
40 views

QGIS API documentation in French?

I am looking for a document which explains what the API of QGIS is, with examples of this API but in French.
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256 views

How to get QGIS layers style in a single file

I have layers on my QGIS project. Rivers Water pipes Gas pipes ..... I set the color, width, size of these layers. All layers are different style. I want to use these styles in geoserver. I have ...
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2answers
66 views

Is there a way to run spatial join within tolerance?

I have some data that should be spatially joined, but from small precision differences (less than 1 in) they aren't joined. I've found no way to add tolerance to qgis spatial join operation. Is there ...
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1answer
49 views

Enhance the color associated with a band od an aerial photo?

I am using QGIS 2 on Windows 7 and have 4-band aerial photos loaded in to a project. I have switched the bands in order to make the photos display as color infrared. Does anyone know if you can ...
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2answers
683 views

SLD parsing fail on GeoServer

I created a custom style on QGis and saved as SLD file. When i added to GeoServer, after validation it, i got an errors about parsing. Parsing failed for Filter: java.lang.RuntimeException: Unable ...
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1answer
123 views

QGIS and Oracle Spatial database - rule based system in future version?

I (a geographer not to familiar with IT stuff) want to start a pilot with QGIS at a municipality I work for. We store our data in Oracle databases. When trying to open these databases (QGIS 2.2) using ...
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1answer
48 views

QGIS documentation in French?

I am working on a plugin in qgis and i have to make a document from A to Z about that but on French . and I am looking now for some documentation of python,QT , pyqt4, and QGIS in French.
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1answer
64 views

Repaint the map after updating a feature in QGIS

I update a feature in a vector layer using the following Python code: layers = QgsMapLayerRegistry.instance().mapLayers() layer = layers.get('my_vector20140614125509945') fid = 1 attrs = { 0 : ...
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1answer
40 views

Searching for features

Sorry for the newbie question. I'm trying to determine if I'm in the right place. With free, open source tools and data, I would like to be able to find (electronically, not by hand) properties (in ...
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1answer
331 views

How to overlay a jpg onto a google earth image?

I have produced a model from an online engine , and it is in a google earth picture. I want to georeference the below picture and apply the boundaries here on my google earth image. I'm using QGIS2.2. ...
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1answer
170 views

netcdf daily data to monthly raster layers

I have a netcdf (.nc) file of 95GB which consisted of daily data for a 50 years period. I tried to process this with ArcGIS (Multidimension tools – MakeNetCDFRasterLayer command) and it was not ...
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1answer
70 views

rubber sheet a polygon collection into another - postGIS

My question is this: How do I create a 4 x 4 grid over the orange grid like the pink(ish) one? The pink grid are geometries that have already been provided and are wonderful. I'm attempting to ...
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1answer
122 views

How to convert boundaries in image to polygons in QGIS

I have an image from a cities districts and their boundaries and I need them as polygons in QGIS. I tried "Raster -> Conversion -> Polygonize (Raster to vector)" as described here, but that ...
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1answer
250 views

Using gdal merge correctly?

Currently trying to use gdal_merge within qgis to stack three raster bands, the command it's showing is like this: gdal_merge.bat -separate -of GTiff -o out.tif "LC80190302014126LGN00_B4.TIF" ...
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1answer
184 views

How to colour contour lines in .shp file when the lines are not meeting in QGIS?

I am doing bathymetry analysis, where I would like to color the contours one by one in the case land is rising (or sea level going down). There is a comprehensive explanation about coloring contours ...
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2answers
225 views

Where to find Metropolitan Statistical Area (MSA) KML data? [duplicate]

Hello GIS stackexchange, GIS is not my field, so I apologize if my question is very basic. I need this data for a odd job at work. I have been unsuccessful in finding the data from Google ...
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2answers
261 views

Exporting to 2D (Arcview 3.0 compatible) shapefile in QGIS?

I need to run my shapefiles through a web mapping application which is incompatible with 3D shapefiles. At present I run them through the FME Universal Translator in Mapinfo, which enables you to ...
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1answer
55 views

QGIS Python - Executing functions for multiple directories

I would like the user to select 2 directories, each directory having their own defined algorithms. For example: First_Directory will add a column to all shapefiles in the chosen directory; ...