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

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319 views

How to install TimeManager for QGIS?

I'm trying to install TimeManager for QGIS. I can't find it under Plugins/Fetch Python Plugins and I have verified that the official repository is listed in the Plugins menu, so I'm wondering if ...
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1answer
211 views

How to get pixel size of canvas in QGIS?

How to get pixel size of canvas in QGIS? It is possibly by python? I mean this read rectangle area.
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1answer
250 views

Is it possible to change the Mouse Wheel zoom direction in QGIS?

I'm just starting to learn QGIS. I'm starting with the basic simple things. Coming from an ArcGIS background, I am used to the mouse wheel action zooming in and out the default ArcGIS way. QGIS ...
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1answer
340 views

How to write a CSV from Python console in QGIS?

I am trying to write out a CSV file from a vector layer made up of points using the python console in QGIS. I've tried the following command: QgsVectorFileWriter.writeAsVectorFormat(layer_Map, Folder ...
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1answer
322 views

How can a HTML table be stored within a database field as a BLOB, text or other value?

My Spatialite database has several thousand spatial polygon records In QGIS, each with a couple dozen field values. I also have many thousands more of additional tabular data relevant to those ...
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2answers
705 views

Layers with same coordinates not lining up [QGIS]

I have a project where I have a few layers (State of Texas, cities, roads, etc.). They are all resaved and projected to NAD83 / UTM zone 14N EPSG: 26914. The project CRS is also NAD83 / UTM zone 14N ...
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1answer
370 views

Changing symbology/color in kml when exported from arcGIS/QGIS [closed]

I have marked some points and used symbology in ArcGIS/QGIS... when I export the file to kml, the color/symbology changes and only single color/symbol remains. Is there any possible way that the ...
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1answer
145 views

Split Map using Python in Qgis

I have a map, in which each region is defined as an attribute of the map (I can select each region from the attribute table). I am trying to create new layers each one containing only 1 region using ...
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2answers
255 views

Calculating area gets a different result

I've calculated the area of polygons with QGIS by using ctr-i - geometry - $area. I've set it on real. The results seem fine, but I've noticed they differ from the area given when I use the ...
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1answer
326 views

Problem when compiling QGIS (with customizations) for Windows

I was able to customize a few features of QGIS in Ubuntu. Now I am trying to compile the same code on Windows, by following the installation guide given for Windows. I have downloaded all of the ...
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1answer
830 views

How to evaluate raster calculator expressions from the console?

How can I execute from the console an expression that should be used with the raster calculator? I'm searching for something like this: qgis.someRasterCalcClass.evaluate("boh@1 + boh@2", ...
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3answers
454 views

Looking for a simple method to find the shortest path with Shapefiles

I am having shapefiles for a particular map location, the shapefile consists of points and polylines. Now I want to find the shortest path between the points. What is perfect and simple method to find ...
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2answers
803 views

Simple automated way to split all lines in layer at vertices using QGIS?

I want to automatically split all lines in a QGIS layer at their vertices (like this). I've done a google search and found this article, which is quite close but the workflow is complicated. Because ...
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2answers
619 views

MMQGIS: How to make grid layer in meters not degrees?

I've read several of the posts on here pertaining to MMQGIS Create Grid Layer option, but I have not found information on how to make the grid based on meters veres degrees. I know how to manipulate ...
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1answer
88 views

QGIS: put vector values into separate layers?

QGIS 1.8.0 Mac: I've got a polygon shape file with values 1-5 in it i.e. contours. How do I get the polygons for value 5 into one layer, 4 into another... so I can assign each a colour and see them?
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176 views

Stuck while Using GeoServer WPS with QGIS

I have been using Geoserver WFS and WMS with Qgis for a longtime. Now i am trying to integrate WPS... I downloaded and activated WPS plugin for Geoserver. And i succesfully got result of buffer ...
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69 views

How do you split a feature using an existing line in QGIS?

All, Is there a way to split a feature (polygon) using an existing line (selected polyline) in QGIS? Thanks! -m
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1answer
180 views

How to apply DEM elevation adjustment parameters?

I have a nice DEM, created from UAV data, which I want to process further in QGIS, my platform of first choice. In order to represent the evelation of each pixel correctly, I have to adjust the ...
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1answer
252 views

How to use QgsOverlayAnalyzer class in pyQGIS?

I am very new to Python scripting in QuantumGIS, so bear with me please. I am trying to use the QgsOverlayAnalyzer class in QuantumGIS (http://www.qgis.org/api/classQgsOverlayAnalyzer.html#details) ...
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3answers
380 views

How to batch-process georeferencing of rasters (prelude to animation)?

I have many (10k) raster files, all with identical size and pixel dimensions, which need to be georeferenced. I would like to georeference one of them manually, using either QGIS or GRASS, and then ...
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0answers
59 views

Why don't libgrass.so.1.8.0 and libqgissqlantconnection.so.1.8.0 load?

I have compiled Qgis 1.8 at Ubuntu 12.10, but some phyton plugins does'nt work, like sextante. Trying to solve this problem, some files don't have been load. They are: libgrass.so.1.8.0 and ...
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70 views

Built QGIS installer with own GUI

I would like to build/compile a QGIS installer with my own customized GUI. Does anybody of you has some experience with it or some help material (links, documents, ...). Is it possible to create a own ...
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0answers
305 views

“topo to raster” tool

is there any analogue of "topo to raster" tool (ArcGIS) in QGIS? I need to creates surfaces from shp for some cases from points and for some from lines and this instrument is very convenient.
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1answer
48 views

How to use classified styles with joined layers?

I am trying to set a color range based on this tutorial In LAYER PROPERTIES for "new", in JOINS, I have joinlayer - data-join joinfield - GEO_ID2 targetfield - GEOID10 Where "new" is my shapefile ...
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1answer
128 views

PostGIS Manager Load Error [duplicate]

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 ...
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1answer
754 views

What does the adoption of Python by NVIDIA for GPGPU mean for GIS?

Today NVIDIA announced support for the Python language on its flavor of GPGPU (CUDA). Manifold GIS uses CUDA to enable some accelerated raster operations but it is not a programmable environment and ...
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1answer
180 views

Which BC Albers should I use and is there any difference?

I was about to calculate the area of some polygons and before I did I did some research. I found that the area of the polygon will be represented in the units of the projection used. So I did some ...
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1answer
1k views

How to use QGIS from command line on Windows

I have QGIS running on a windows operating system. I am willing to use QGIS from command line to follow this procedure. Unfortunately, i cannot manage to have qgis declared in the command windows. I ...
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259 views

QGIS WMS didn't show georeferenced tiff

I try to reference image and use them via WMS. Chouse project CRS to EPSG:900913 Add OpenStreetMap source using gdal wms <GDAL_WMS> <Service name="TMS"> ...
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3answers
372 views

Coordinate System (Malaysia RSO Projection) not lining up in QGIS and ArcGIS for Desktop?

I am using QGIS 1.9.0 on Linux Mint; and I am new to (Q)GIS I have three layers (2xshapefiles, 1xopenlayer[Bing Maps]) that I am trying to line up located in peninsular Malaysia. Shapefile_1 is a ...
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1answer
131 views

Raster export for regressions analysis

I have the following issue: I am trying to do a regression analysis between the (z) values of two rasters. What I would ideally like to have is the raster output not as grid but rather a list of ...
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169 views

Can you set a QGIS print composer to render the map as default?

I have set up a number of templates for the print composer in QGIS. In the Print Composer, there is the option to have the map image displayed in 3 ways: as a blank rectangle with no updates until ...
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1answer
244 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.
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2answers
897 views

QGIS: using postgis can I define a layer using sql?

I have a vector layer (call it master) that is stored in postgis and consists of a number of line segments. I also have a collection of sub layers that consist of subsets of the master layer. I can ...
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2answers
254 views

How do I plot data stored in an attribute table (really in a database) in qgis

I have a csv of UK postcodes from Ordnance Survey that looks like SE1 0AA,10,531869,179427,E92000001,E19000003,E18000007,E09000028,E05000536 When I import to QGIS using 'Add Delimited Text Layer', ...
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1answer
94 views

What could I do to make QGIS find all the plugins?

I'm starting to use Ubuntu 12.10 and would like to get my QGIS running on it. Installation was fine but when I tried to add a package called Points to Paths the Plugin Manager was unabled to find it. ...
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1answer
81 views

Shapefile CRS damaged. How to bring it back?

I have two shapefiles with same location and extends (EPSG 4326). But one of the shapefiles CRS seems to be damaged after doing a lot wrong with reprojection... its not shown on the same position as ...
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2answers
232 views

How to create a matrix of points inside a polygon with QGIS?

I need to create a matrix of points (e.g. 3.5 x 0.5 meters), with a defined orientation, inside a polygon. Essentially, I have to plan the arrangement of plants in a grove in order to plan an ...
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3answers
291 views

How to combine stacked polygons within a shapefile?

The image below shows my shp-file. Every polygon has the same transparent color. So a darker blue means, that several polygons are stacked! How do I cut every polygon with each other so no polygons ...
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1answer
334 views

How to do spatial adjustment of Line features by edge snapping in ArcGIS?

I have two polyline features of same area which are prepared based on two different raster imagery. Hence the two features are not exactly matched and has some shift. How can I adjust them to overlay ...
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1answer
272 views

CRS is UTM 51, the coordinates are shown in meters, show same coordinates as lat long as well?

We are working with a CRS of UTM 51N, the Philippines. The coordinates under cursor are shown as metric values. Clients however like so see the Latitude Longitude values when they move the cursor. Is ...
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1answer
257 views

How to zoom to specific lat/long point in QGIS

Does QGIS have the ability to Zoom to a specific lat/long point upon the user entering one. I can see it shows the coordinates in the bottom task bar but I'm not seeing a way to manually enter ...
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1answer
253 views

Using Easy Custom Labeling: Where's my missing label?

I’m using the Easy Custom Labeling plugin (with QGIS 1.8). I have one feature label which refused to show itself. It’s just not visible. When I look at the attributes table, the feature name appears ...
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2answers
988 views

Convert KMZ image to UTM projection jpg file

I have some KMZ files that are basically aerial imagery that has been referenced to Lat/Long. I would like to convert them to a projected UTM coordinates such as NAD 83 in a geo-jpg format. I was ...
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2answers
2k views

How to install the Python module shapely for QGIS use?

I'm using QGIS 1.8.0 on a Mac with OSX 10.6.8 (Snow Leopard). I've installed QGIS including GDAL, GSL, UNIXImageIO, Freetype, and Matplotlib all from www.kyngchaos.com. When installing the plugin ...
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4answers
381 views

How to display a “Save As” dialog for raster files?

I'm writing a QGIS plugin in python. I need to show a "Save as" dialog window in order to allow the user to select the path of the output raster file. Do I need to create a QFileDialog and manually ...
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1answer
61 views

QGIS 1.8.0 Mac where is measure window or measure area symbol?

Just trying to measure the area of a selected polygon (a few km2) but can't find out where the measure symbol is (mentioned in some posts here) or how to get the measure window shown in the manual. ...
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1answer
181 views

OpenLayers Plugin won't render maps correctly

In QGIS, I've created a map by adding a Tiger layer of my county, a KML of a water feature, and a geo-coded CSV of points of interest. I'm trying to add another layer using the OpenLayers Overview. ...
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1answer
242 views

Getting Transparent Circles with Heatmap Plugin

With QGIS, I am trying to create a heatmap from a set of points I added as a layer using the "Add Delimited Text Layer" plugin. The points are a collection of complaints from around a city and I ...
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2answers
257 views

How to create Concentric Circles in QGIS?

I'm trying to build a planning tool for center pivot irrigation system. It involves selecting a field (polygon), a center point, and then an outer circle to set the outer limits of the system. From ...