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

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3
votes
2answers
102 views

How to map Traffic Count Points to Streets?

I've got point data representing traffic count locations and I am trying to figure out the best way to represent them on a map.I thought about kriging to provide a continuous surface but I don't think ...
0
votes
0answers
115 views

How to install Quantum GIS Lisboa and scipy

I'm trying to install some plugins of the QGIS but an error occurs. The program asks the scipy program. I installed Python, the Numpy and scipy. Also installed the program R. However, QGIS continues ...
1
vote
0answers
235 views

Georeference to UTM projection using openlayers plugin in QGIS

I have some aerial imagery that I need to georeference using QGIS into a UTM projection. In order to do this I need a basemap layer for the reference points. The openlayers plugin could work great ...
0
votes
1answer
100 views

How to standardise colour-value graduations across multiple maps

In QGIS I have a vector dataset (imported csv vector + csvt) spanning multiple years, and a shape file shape which is essentially a grid. By joining the csv file with the shape file I can apply a ...
0
votes
1answer
76 views

Sextante Plugin error in QGis

I am an user of QGis 1.9.0. When I go to Fetch plugin option Sextante plugin is broken seems what is the problem?Even I agin downloaded the plugin in Qgis official resportary but it displays me the ...
2
votes
3answers
1k views

Add points for every 100 m at polyline (QGIS/Mapinfo)

I have a polyline and want to set points for every 100 m. And if possible, with unique values for each point, 100, 200, 300 etc. Can it be done? The QGIS-plugin, Sextante algoritmes "v.to points" ...
1
vote
1answer
285 views

Is it possible to convert QGIS QLM to SLD (w/ New Symbology)?

I have a QGIS project where I have created some nice styles using New Symbology. I would like to convert this to either SLD for use in GeoServer or CartoCSS for use in TileMill. I have tried saving ...
2
votes
1answer
1k views

Convert 32 bit image to 8 bit image in QGIS

I want to convert my images from 32 bits to 8 bits. I'm using otb to calculate texture and the raster output is on 8 bits, I'm going to use this information as a layer stack for my multispectral image ...
0
votes
0answers
92 views

QGIS: MSSQL spatial layer bug with estimated metadata

It looks like there is a bug when connecting to MSSQL databases to add a spatial layer when using estimated table parameters. Connecting one time works fine and all the spatial enabled tables are ...
1
vote
0answers
191 views

Calculate Distance Matrix for ALL possible combinations in the dataset in QGIS

I have a Vector Layer that is created out of a MySQL database and has the relevant points stored in WGS84 format. The import works well, however, when I try to calculate a distance matrix between all ...
7
votes
2answers
822 views

Easiest way to create historical street maps using QGIS

I want to make some historical street maps using QGIS. I understand how to upload a historical OS map from DigiMaps to QGIS, but I want to actually 'draw' the streets myself in order to have some ...
5
votes
2answers
333 views

10 GB Raster Aerial Image in Quantum and POSTGIS

I have a problem... I have been successful in uploading the raster in postgis but when I access it through Qgis. it does not open even after several hours. I have 10GB aerial image raster and ...
0
votes
0answers
129 views

How to merge raster quadrangle tiles in qgis?

I've downloaded some dem tiles from here http://www.granit.unh.edu/data/search?dset=dem/dem174, which I'd like to merge into a single smooth digital elevation model usinq QGIS. So far I've tried ...
0
votes
1answer
216 views

Label polygons in MapInfo like QGIS?

I was wondering if there is a way to angle Polygon labels in MapInfo like it's done in QGIS (see image link below). Thanks, Alan
2
votes
2answers
668 views

Styling OS Vectormap Local in QGIS?

I am attempting to style Ordnance Survey Vectormap Local on QGIS 1.8.0 by using the styling sheets suplied by Ordnance Survey. The styling sheets are available from the OS website ...
1
vote
3answers
144 views

How to search for several different features in the attribute table?

I guess my problem is a quite simple one, but the query builder and I have our difficulties, so maybe someone can help me. I have a long attribute table in QGIS and am trying to extract about 200 ...
0
votes
1answer
125 views

Quantum GIS Installation Failure

I installed GSL 1.16 & GDAL 1.10, then I proceed to install QGIS 1.8.0 After running the .pkg(installer) I get the following message. Failure The GDAL 1.9 framework is required. Does this ...
1
vote
1answer
178 views

Making grid lines opaque so just lat/long coords on map border using QGISGDALPERF?

Can any one help me with adding graticules to my map? I have managed to add a lat/long grid over my map, however I want the grid lines to be opaque with just the lat/long coords on the map border - is ...
1
vote
1answer
665 views

How to create filled contour lines in QGIS?

How can I create contour lines that are filled with a graduated symbol usinq QGIS? In ArcGIS for Desktop I can do this. What about in QGIS?
0
votes
1answer
31 views

Can't get CRS transformations to work with scalie

No matter what I do I can,t seem to be able to transform several shape files (all vector) to a CRS that works. What is recommended for British Columbia for forestry purposes is NAD83 BC Albers. ...
1
vote
2answers
536 views

What is the equivalent of arcpy “Con” in QGIS and/or R raster-package?

I'm looking for an equivalent of the conditional expression "Con" from arcpy in an open source spatial analysis package. I'd prefer to use QGIS or R. To provide some additional detail, I need to ...
1
vote
1answer
137 views

How can I turn QGIS into a simple hiking planner?

I'd like to try and turn QGIS into a simple hiking planner. I have found and worked out how to import OS raster mapping at the correct scale and how to add freehand vector lines to the mapping, which ...
1
vote
2answers
73 views

Adding 'freehand' data to raster mapping in QGIS

Having just worked out how to import raster mapping into QGIS at the correct scale, I'd like to now add useful information to the map like marked routes, labels etc. How can I do this in a 'freehand' ...
1
vote
2answers
776 views

How do I import OS raster tiles into QGIS at the correct scale?

I have some tiles of OS raster mapping and their associated TFW georeferencing files. The GR files are in the same folder as the raster data and have the same names, ie TQ21.tif/TQ21.tfw. In QGIS ...
1
vote
1answer
162 views

Why does QGIS generate Shapefiles without DBF?

I need to output shape files for archiving, which requires generating .shp, .shx and .dbf files. When I save a layer as a shape file it generates the first two, but not the dbf. All the help I can ...
0
votes
0answers
250 views

Why does QGIS not show my new geometry columns?

I am trying to connect a few PostGIS Tables to Quantum GIS. The problem is that the geometry columns QGIS is showing are not the ones from the PostGIS database. QGIS shows me some columns I used to ...
5
votes
2answers
1k views

How to use map composer in a stand-alone script?

I'm trying to follow the map rendering section from the pyqgis cookbook, but I'd like to test this as a standalone application. I can do the first part, using simple rendering, but I'm a bit stuck ...
2
votes
3answers
156 views

How to create a raster from scratch

I realize this isn't a geographic question as I'm not trying to make this into a geographically placed image. But I hope you all will know how to do this. I want to make a raster from scratch. I ...
1
vote
0answers
63 views

How to fix contour lines which look like a mirror image of the DEM?

I was trying to create contour lines in QGIS 1.8 for a DEM I have, but it's creating it in reverse. The contour lines are sitting on top of my DEM like a mirror image. I was wondering if someone could ...
2
votes
1answer
240 views

Why is field calculator returning NULL for $x and $y in line and polygon layers?

I am trying to include XY coordinates in the attribute tables of several of my vector files; they are line and polygon files. I have tried two methods; first I used $x and $y in the field calculator ...
2
votes
0answers
19 views

Sum vector data correlating with a second vector layer [duplicate]

There are a lot of questions very similar to mine, but I couldn't find one that accurately described what I want to do. I am working in QGIS. I have one vector layer which, among other attributes, ...
0
votes
1answer
709 views

How to fix “Connection failed - Check settings and try again” when connecting to PostGIS?

I have Postgres running via Postgres.app on rails already and am trying to connect QGis to the database. PostGIS is working already. (questions already found online deal with this issue only) I do ...
3
votes
1answer
165 views

How to convert a line to points?

I'm working with QGIS and I want to convert a line into many points, does someone know how? Thanks.
2
votes
1answer
168 views

Where can I find the data that QGIS used to custom its menus as well as it's toolbars?

I have noted that QGIS uses some data to restore its menuitems as well as its toolbar items everytime when it is started.And I have being trying to hunt them out in my hard disks but sadly ...
0
votes
1answer
196 views

How to merge polygons into a single item where an attribute is same?

I have a shapefile of a area .It consists of list of fields in which sub locality is also a field.Under the sub locality field all the areas are common say for example: perungudi,perungudi,perungudi. ...
2
votes
1answer
784 views

How to create a QGIS Action which loads a raster?

I am following an article here:Actions HowTo , specifically the piece about an action to load a raster: Python type Add Raster Layer ...
2
votes
2answers
390 views

Import Points with WKB format to QGIS

I have a .csv file with population data according to specific locations (Points). My problem is that all locations are given in WKB format like that: ...
4
votes
0answers
68 views

What's the best way to add Tilemaps to QGIS without having to use Webmercator? [closed]

I'm looking for a good way to add tilemaps in qgis that are either in a custom projection or that I can reproject in qgis. I have used the openlayers plugin to add basemap layers, but it forces me to ...
1
vote
0answers
84 views

How can I maintain MapInfo GRC file attributes in QGIS/GDAL?

I am trying to manage a classified MapInfo grid file in QGIS - I'm wondering if anyone has any experience with maintaining the attributes of the classified grid? QGIS seems to assign them just a ...
1
vote
0answers
281 views

Shapefile projection issue - layers not lining up [closed]

See below for screenshot. The purple rectangle should line up with the green rectangle in the top right (OpenLayers Google Physical layer) and the tan points. I was sent this shp and given the ...
0
votes
1answer
55 views

How to set layer symbol and layer name side by side in QGIS Composer?

When I add a legend in QGIS Composer, the layer symbols are set below each layer name. Is there any way to have them side by side? This is what I get: "LayerName" [layer name] ~ [layer ...
7
votes
2answers
380 views

Is there an open source alternative to ArcGIS for Desktop's Integrate tool?

I need to snap about 1000 lines in one layer to the lines in another layer (there are about 5000 lines in the second layer). The lines to be snapped are about 15 map units away from the base layer ...
3
votes
2answers
490 views

Is it possible to embed QGIS layer styles in a Spatialite database?

Spatialite is a great alternative to shapefiles - but how could I store the QGIS layer style together with the data so that it has a default style? For a shapefile I would just save a [name].qml with ...
0
votes
1answer
140 views

How to Resize the Qgis Main Window from python

I would like to write a plugin that simply resizes the qgis main window to make it small. How can I access the qgis main window through the qgis api? Use Case: We are having problems with qgis taking ...
1
vote
2answers
349 views

How to add a dynamic timeline to the QGIS canvas?

I am using the plugin Timemanager which works really great but there is one thing I'd like to improve. Instead of displaying the date and time on each frame, I would like to display a timeline ...
0
votes
1answer
297 views

How to convert OSM polyline data to polygons?

I just now downloaded OSM data .I am having the data as polylines. I want that polylines as polygons is it possible in Qgis?below I also posted the screen shot of the polyline also.
2
votes
1answer
578 views

Can Tiff files from ESRI Geodatabase be loaded into QGIS

I have been able to load an ESRI geodatabase which contains shape files into QGIS, however when I try to load a geodatabase containing tiff files I get an error message saying ...."is not a valid or ...
0
votes
1answer
167 views

eVis-Plugin centers mapwindow on coordinate origin

I have a QGIS-project with layers loaded from a postgis-database and also some shapefiles. I use the eVis-Plugin to display pictures. The displaying is working fine but after clicking on the geometry ...
3
votes
1answer
176 views

Field Value Mapping QGIS

I am wondering if there is a way to do field value maps that are filtered based on another attribute field? I know how to associate value maps, but not that are connected to another field. I have ...
0
votes
1answer
946 views

How to count number of polygons inside another polygon layer?

I am looking for a tool in arcgis 10.1 Qgis or R that allows me to count the number of polygons that are inside specific areas (defined also as polygons). My data consists in: 1 shape file with ...