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

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Problem with GRASS in QGIS

I am trying to import a vectorlayer to GRASS from QGIS. I get an error and hope someone here can help. Been trying to fix it for hours, but come no closer to a solution..... This is the error I get: ...
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1answer
184 views

How to fix QGIS crashes when using GRASS toolbox?

I've installed QGIS 2.0.1 on Ubuntu 12.04. exactly as explained on qgis.org . Unfortunately QGIS crashes when trying to use any GRASS model (r.aspect as example): just opening QGIS, click on toolbox ...
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2answers
1k views

keep the same field headers after joining a table to a shape file in QGIS

I noticed that after joining a table to a shape file the headers of each fields in the table used for the join are changed by QGIS and they are attributed to a different name. For instance, i had a ...
4
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2answers
114 views

How to replicate trunc function on QGIS?

I've search a bit before asking this question, but I haven't found the answer. Is there a Trunc function on QGis? I've tried using floor, but it doesn't work (like I want) if the number is negative, ...
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1answer
239 views

Is there a way to automatically calculate attribute values for new features?

I am creating a vector point layer which will be added to over time. I have been using the field calculator to populate fields such as X and Y coordinates. I'm wondering if there is a way to have ...
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1answer
1k views

How to pick the coefficient in Inverse Distance Weighted method?

I'm using QGIS 1.8.0 to interpolate weather data. This is, I have a weather station located in say, A and C. With the Inverted Distance Weighting or Triangular Interpolation methods, I can ...
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720 views

Trying to make QT + QGIS working

I'm mostly a Java programmer, I worked on C++ many years ago, and knowing this my project manager has asked me to create a little app in Qt that can open a shape file, using QGIS. But I'm encountering ...
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1answer
592 views

QGIS, making a topo map from an excel file

I will appreciate your help. I am new to QGIS, this question might be common but trough me search I did not find the answer I needed hence my question here. How do I make a topo map ( raster) from ...
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2answers
1k views

QGIS 2.0.1. missing Google Mercator CRS

I've downloaded the latest QGIS version and I cannot add basemap. I installed OpenLayers plugin and while adding any map from list QGIS crashes. I tried to enable Google Mercator CRS first, yet it's ...
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1answer
23 views

QGIS 1.8 or 2.01 select entries in .shp file that match a field entry [duplicate]

I've got a .shp file with 40k points (trees) in it. One field is the species name. Is there a way to select those entries that match a desired field name e.g. 'black walnut' so I can move them to a ...
3
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1answer
161 views

How to get projected centroids in QGIS?

I am trying to get a centroid for several polygons on a global scale, in a way that it would correctly represent the common centre of all the polygons, taking Earth's curvature into account. The ...
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170 views

How to install GRASS in QGIS Dufour?

How do I install GRASS to run in QGIS 2.0.1? GRASS is not listed in the Plugin Manager and attempting to access it via the Processing Toolbox gives me the following error:
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83 views

How do I shorten the refresh rate of qgis_mapserv.fcgi?

Is there a way to shorten the refresh rate of qgis_mapserv.fcgi? After having uploaded a revision of a file these changes do not take effect in qgis-web-client. I guess it's because the computed tiles ...
2
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1answer
39 views

Get coodinates from point shapefile

I converted a line shapefile to points as you can see in the attached image. Is there a way to know the coordinates of each point? Any help would be really appreciated! PD Im using QGIS 1.8.0
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149 views

Merging contour lines along tile boundaries

I am working with the CANVEC data set. The data in canvec is broken up in to mapsheets. eg. 116B04. I have data covering the entire province of the Yukon. I have merged all the data in to one ...
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1answer
132 views

How does QGIS Topology Checker check the topology of SHP and OSM files? [closed]

Can anybody make me clear if .shp & .osm (OpenStreetMap Data) are holding topological data/relations or not. if .shp files are not holding then how qgis plugin topology checker checks for the ...
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1answer
169 views

Is it possible to connect to FEMA's WMS and WFS using QGIS?

I have just found out about the wonderful world of WMS and WFS. I have added the FEMA versions of both to QGIS. WMS and WFS. The WMS seems to connect and adds something to QGIS, yet it is not visible. ...
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431 views

How to share ArcMap shapefiles with QGIS?

I'm trying to send a ArcMap 10 shapefile for a QGIS user and something happens with attribute table during the process. Columns will be rearranged, hidden digits will appear to coordinate columns and ...
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1answer
353 views

Can I create a reusable text annotation style in QGIS?

I want to create a fairly simple map with a few locations emphasized using annotations. I don't like the default annotation formatting: So, I've reformatted the annotation background color, ...
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2answers
785 views

Ortho Projection produces artifacts

I`m trying to create a sphere-like view using qgis and the "world from space"-projection http://spatialreference.org/ref/sr-org/6980/ (essentialy an ortho-projection). ArcGIS wraps the shapes ...
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0answers
142 views

Using 3d Polyline in QGIS to calculate Volume?

This question may be completely off the mark. I have a survey drawing in DWG format, I use AutoCAD 2d but the survey was created in LSS. The Countour lines in the DXF have XYZ coordinates. Firstly ...
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1answer
344 views

How to automate creation of PNG maps using Python?

I have a project with 50 vector layers and I have done custom styling for them. Now I want to make around 30 png files with different xmin, ymin, xmax, ymax. The output size (png) should be width ...
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1answer
162 views

What are the set of projections that can be accurately georeferenced using polynomial 2?

Background I'm starting with a map from the internet (Encyclopedia Britannica) and georeferencing it using QGIS 2.0.1, I get really accurate georeference solution using polynomial 2 transformation: ...
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1answer
70 views

QGIS 2.0 Plug In Repository - How to Set Parameters to qgis=1.8

A number of very useful QGIS plug ins available in 1.8 are not available in 2.0. Is there a way to set the parameter page in "Repository Details" to 1.8 so I can access the 1.8 plug ins and check ...
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1answer
767 views

Python error with open layers plugin QGIS 2

I've been using QGIS for a while but since using QGIS 2 the OpenLayers plugin doesn't work for me on my home pc. (However, I have installed the same version at my workplace with success.) I have ...
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1answer
98 views

Find GPS midpoint and SD of GPS coordinate along a certain heading in QGIS

I have a set of GPS coordinates (x, y) along with heading information. The heading for these coordinates is more or less the same and the coordinates are within a few meters of each other. How can I ...
2
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1answer
319 views

Which data providers support loading attribute tables without geometry?

I have a table in Memory from a cx_Oracle query (a list of rows, and a list of field names and their types) in my python plugin and I want to load it as a geometry-less layer (Attribute table) in ...
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1answer
900 views

How do I run the nvis tool in QGIS GRASS?

I am trying to follow this workflow: [How to generate a DEM from a countour Shapefile?] and it's running fine, and when I hit view output or view results I end up with a flat raster with shading ...
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44 views

problem on loading kriging outputs [duplicate]

My problem is the following: everytime i run ordinary kriging or other interpolation techniques i obtain this error message from QGIS Notice that these are the details for SAGA I would like a ...
3
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1answer
484 views

How to create DEM from contours without ArcGIS Spatial Analyst licence?

I'm trying to create a 3d DEM/DTM from a flat contour shapefile which has height data attached to each contour, but I'm not sure how to do this? I've found this post, on creating a dem from contours ...
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191 views

Can QGIS display projected coordinate system for map, at same time as lat/long graticule and scalebar in km? [closed]

I am aware of this question, which was posted a year ago, but its accepted answer appears to be a workaround rather than a solution to the issue which is the subject of this Question. I wish to ...
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1answer
69 views

Export data of points and polygons which are intersected

I have a shp file of roughly 100 Polygon. I also have a corresponding list (including X,Y data) of about 3000 points, in a csv file. Overlayed within QGis the 100 polygons contain about 90% of the ...
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1answer
136 views

Is it possible to calculate a value based on values of another row?

I have a point shape file in qgis. For one of the attributes, I would like to offset the values, i.e. the value for point 1 goes to point 10, the value for point 2 goes to point 11 and so on. I see ...
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1answer
202 views

No module named pyspatialite- plugin:Qspatialite, OpenSUSE 13.1

I cannot run the plugin because of module missing. I can't find that module in the OpenSuse repository, and python community repository. I'm using QGIS 2,0 and OpenSuse 13,1 Where can I find ...
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1answer
360 views

How can I add height data to a polyline in QGIS?

I want to place a polyline at the correct altitude in QGIS. Is that possible and how do I do this? What I have is a polyline (railroad) and I want to add information on the electrics above the ...
7
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2answers
752 views

How do I use the Natural Earth SQLite DB with QGIS?

I just downloaded the Natural Earth data in SQLite format from http://www.naturalearthdata.com/downloads/. I had assumed that this would be a SpatiaLite database, but it appears not to be! QGIS is ...
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0answers
39 views

how to tidy up line intersections

I am very new to QGIS so please bear with me. I am using version 2.0. I am trying to tidy up lines that I have collected using a vertex function on my gps. When I zoom in to the map in QGIS it shows ...
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2answers
1k views

How to select a multiple field value by expression from the same layer in QGIS?

Using QGIS in the operation 'select by expression' how is the correct expression to select multiple field value? ex. City NAME = ROME and NAPLES (expression is invalid)
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91 views

Clustering a number of points with the same coordinate around a central point

Is there a plugin in QGIS to randomly distribute points with the same coordinates around the coordinate? Similar to the "shift point plugin", but instead of producing a circle of points the points are ...
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1answer
87 views

Question about quantum gis, and importing csv point data

I'm trying to add some point data from a csv file (it's in decimal degree lat lon) and overlay over road data that I already have added. The problem is that I can't get it to line up. I'm sure I'm ...
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0answers
203 views

QGIS 2.0 Plug Repository Connection Failed

I'm trying to connect to the QGIS Official Plugin Repository but the status within the Plugin Manager window is always"unavailable" for the URL - http://plugins.qgis.org/plugins/plugins.xml. I'm ...
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2answers
270 views

How can I create a form so the user has to be authenticated to access a project?

I have a login form in QGIS and when it is loaded, python gives me an error for, apparently, not recognizing the findchild part. This is due to the fact that the form isn't loaded before the script is ...
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2answers
105 views

Missing lxml in QGIS 2

I made a QGIS plugin in QGIS 1.8 doing a lot of XSLT transformation and other XML handling with the library lxml. After upgrading to QGIS 2.0 this plugin does not work anymore: "ImportError: No ...
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1answer
502 views

3D Polygon Layer Stack with QGIS

I was curious if there is a way, or plugin to visualize a 3D polygon layer stack in QGIS (or another open source package). I have looked at NViz, but it only seems to work for rasters. I have a ...
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162 views

QGIS 2.0.1-3 not opening

I've excitedly just downloaded the latest version of QGIS 2.0.1-3 (QGIS Dufour) and now it won't open. I performed the exact same process last night (without problem) on my home laptop (64-bit OS ...
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1answer
53 views

How to get estimates of areas of overlapping polygons in one shp to another?

Sorry for my ineptitude, but I have two vector shape files of Africa. One has polygons of countries, and one has polygons of tribes a long time ago. What I want to do is to find the intersection of ...
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235 views

Unable to render layers in MapCanvas using PyQGIS/PyQt4

I am trying to get some layers into a MapCanvas and style them. I am following the PyQgis Cookbook info here but my code is just not working. I've been spinning my wheels on this for over a week now ...
2
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1answer
105 views

How to select vector features with partial (>33%) overlap with another vector feature?

I have a grid and a range map, and would like to select those grid squares which overlap at least 33% with the range map. The range map is a single vector feature. (I'm new to QGIS but have some Arc ...
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0answers
198 views

Convert Graphics to Vector in QGIS

I am wondering if there is a way to convert a graphic produced from symbology in QGIS to a vector layer (ie: shapefile). I have a point layer with bearing direction in the attribute table. Following ...
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1answer
486 views

Unable to load PostGIS vector layer into QGIS using python cookbook recipe

I'm having trouble loading a PostGIS layer using Dufour (from osgeo4w), using the guide at http://www.qgis.org/en/docs/pyqgis_developer_cookbook/loadlayer.html. I just get the 'invalid layer' message. ...