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

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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
184 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. ...
4
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1answer
250 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
266 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 ...
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1answer
54 views

How to install an old QGIS Master (1ab5cdc)?

I need to revert my current version of the QGIS Desktop Master back to 1ab5cdc (about 5 months ago). Anyone know how I can make this happen? I'm running windows XP
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0answers
98 views

Can layers from Spatialite db be used as input for a Sextante model?

I'm trying to build my first models in SEXTANTE and already fail at the start. It seems not to be possible to add a vector layer which derives from a database. Orginally, the layers are from a .mdb. I ...
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1answer
220 views

Is there anyway to modify thickness & color of a selected polygon?

QGIS - version 1.8.0. Is there anyway to modify the thickness and color of a selected polygon (Select Single Feature)?
2
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3answers
468 views

How can I use jp2 aerials photos in QGIS?

I have previously been able to add raster data in the jp2 format to QGIS. I am able to do so on 1.8 installed on my laptop. Unfortunately when I attempt to do this on my desktop, it claims that the ...
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1answer
367 views

“Easy Custom Labeling” arrows: How do I get them?

I have installed the Easy Custom Labeling plugin, but haven't figured out how to make the "Generate lines" function work. When I click on the tool in the toolbar, it opens the dialogue to specify my ...
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2answers
1k views

How do you change the editing capabilities on a MapInfo .Tab file?

When I load a .Tab file into QGIS I am unable to make changes to it. The information on the MetaData Tab reads the following: "Editing Capabilities of this layer: Add Attributes, Fast Access to ...
2
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1answer
84 views

Is it possible to use a WHERE clause with Grass v.in.ogr for DGN sources?

I am trying to import a .DGN with Grass v.in.ogr in QGIS. I am able to import the DGN perfectly, but I would like to filter the elements using the WHERE option. From searching, reading and testing I ...
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1answer
122 views

Split polygons and extract points

I have a polygon file with 90 adjacent polygons. I also have a lat/long point file that overlaps the entire surface of the polygon file (170,000 points). My problem is that working with all of the ...
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1answer
76 views

Syntax in Qgis "Rule properties?

I struggle with Qgis and some drawings of water pipes for a water company. According to the program it is possible to place different signatures for different components (stopcocks, T-pieces, etc.) ...
2
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1answer
192 views

How to work out sqft/m of land coverage?

I am currently self teaching myself on qgis whilst volenteering on a project on a river catchment and your help is hugely appreciated! I need to be able to work out the percentage of land cover or ...
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1answer
121 views

Projection WGS 84 is slightly displaced referring to a hillshade in QGIS

I have a hillshade and a vector layer. The vector layer is slightly displaced referring the hillshade. About lat=100m and long=175m The CRS of the project is EPSG:3397 - PD/83 / Gauss-Kruger zone 4. ...
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0answers
55 views

QGIS 1.8.0 Mac can't create ring

Can anyone spot what is wrong here? I've selected single feature, the existing rings are obvious, it's not intersecting anything (even a feature in another layer...
2
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1answer
641 views

Following previous instructions to set up adding ecw files to QGIS does not work

I have followed the solutions to setting up ECW in QGIS. However, none of them work. In addition I get a mount - access denied error when trying to load the gdal-ecw and gdal-mrsid plug-ins using ...
2
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1answer
479 views

Grass v.clean.snap with Polygons

I am doing some topology testing using Grass in QGIS. I am hoping to snap nodes to eliminate gaps between polygons. When I use the v.clean.snap function in Grass it does not work on polygons. When I ...
4
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1answer
319 views

Topology problems with QGIS/GRASS

*edited file links below I'm working on several NGO projects at the moment, all of which are reliant on being able to use a district level map with some 490+ features, and I am running into some ...
2
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1answer
1k views

Either GeoJson to TopoJson conversion problem, or projection-issue with D3.js

My 'handcrafted' cartogram (How to create contiguous area cartograms in QGIS or R?) is ready to embed in code - I want to present it online with D3.js. Therefore I produced a topoJSON file of it - ...
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3answers
689 views

How to make polygon from cells of a raster?

I have 100 rasters, each raster has the same cell size and extent and i want to make a polygon of each cell. Can anyone help me doing this?
2
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0answers
53 views

Why does Field Calculator put in all these 9's?

I’m trying to update some GPS point coordinates in an attribute table using QGIS Field Calculator. However, regardless of whether I do it by creating a new field or updating an existing one, I get ...
2
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1answer
320 views

QGIS 1.8.0 on Mac - how to cut/paste/delete?

I have a line vector layer selected, editing is on, I select one vector (a dozen points) with the node select tool so the vertices are red squares. the cut icon is greyed out, command/X does ...
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1answer
189 views

QGis and developpement version [closed]

On various forums, when I asked some question, I have got more and more answer like that: "you can do this with the development version of QGis 1.9... but you can't with the current version..." It is ...
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1answer
110 views

segment lines according to point using pgRouting?

I'm working on postgresql and I am trying to create table to generate graphs. I have a table that contains all the objects of a city (points) and another contains the city street. My goal now is to ...
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1answer
97 views

What's the single point listed in a GPS track's attribute table?

When I import GPS waypoints to QGIS, it includes coordinates that show up in the attribute table. That's great. What I don't understand is when I import tracks. I still get coordinates, as though it ...
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1answer
129 views

Obtaining lat/long values [duplicate]

I’m sorry, I may be missing something very basic; but I wanted to fill in some missing lat/long values in my attribute table (using QGIS 1.8). I found this: How do I calculate the latitude and ...
2
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1answer
1k views

split features (vector line) problem

Part of a stream is now underground so I'm trying to use split features to break the stream into two pieces. The manual says to select the feature, then the split features icon, then draw a line ...
2
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3answers
2k views

Is there a way to clip the Google Satellite Layer from open layers plugin?

I have imported the Google satellite imagery though open layers plugin. I would like to clip it to a polygon shapefile of New York State. Is it possible to do this? I tired the GDAL Tools and it wont ...
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1answer
329 views

Problem in libtiff.dll when starting QGIS

When I try to start QGIS 1.8.0 I get the error message "Can't find procedure start address TIFFMergerFieldInfo in libtiff.dll" and the program won't start. I have downloaded and reinstalled QGIS ...
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2answers
84 views

How to align directions of connected lines?

I have a vector line made of different pieces of lines with different directions. I merged the lines to one. But this merged line still have different direction in its "invisible" parts. I want to ...
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0answers
142 views

Download/Upload GPS/Qgis don't work anymore

We were using Qgis and GpsBabel to download waypoints and tracks from GPS garmin 60 or 76. Since few weeks, this is not working anymore. There is a error windows, and nothing is created. I tried ...
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1answer
164 views

Cadtools getting the distance in meters

While doing the parallel line method by using the cadtools its asking the distance in meters but i need the parallel in feet values(I need to enter the distance in feet values). currently we are using ...
3
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1answer
714 views

How to uninstall standalone QGIS & reinstall in OSgeo4w on Win7?

I need to apply a patch to QGis but installed as standalone instead of OSGeo4w: foolish. I'd like to uninstall then reinstall via OSGeo4w so as to have linux-like updating support, but before I do ...
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2answers
131 views

How to acces features attributes when creating renderer?

I'm trying to customize the rendering of a point layer in QGIS using python. Thus I have written a renderer class as explained in the documentation ...
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2answers
112 views

False easting/westing with MGI/Austria M28

After extracting the XY coordinates from geometry data via "save as csv" I get coordinates which are about 150 km more in the west than they should be. North/south seems right. I set the CRS to ...
4
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1answer
806 views

How to deploy a QGIS Python Standalone Application with minimum installation size?

I am trying to create a Standalone QGis Application using python. I was able to create the nice looking shapeviewer application by following the steps here. Now I would like to deploy this in ...
3
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1answer
768 views

Split vector layer by field name

I have a vector layer of 108374 lines I want to split the vector layer into field names of the layer, which is 17. Now, I want to create a new vector layer containing one of the field names e.g. ...
3
votes
1answer
163 views

draw lines with an angle inside a rectangle in python

I am trying to make a plugin for Qgis with python. I have the four corner coordinates for a rectangle. I want to give the user the inputs, line space and angle (0 -180 degrees). With these inputs, I ...
3
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1answer
595 views

How to set up QGIS print composer options from the python console?

If I have a print composer called "ABC", I would like to "tell" its composer that I would like to update "Map 0" to simulate the "set to map canvas extent" button activation update certain text ...
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0answers
107 views

Couldn't load SIP module - python disabled

Recently my QGIS started refusing to load SIP module, from day to day without any significant changes in the system (I'm on Windows7 x64). Message thrown at startup: Nie można wczytać modułu SIP. ...
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0answers
67 views

How to populate polygon extents to an attribute table in QGIS

Is there a way to calculate the XMIN, YMIN, XMAX and YMAX of a polygon and write it to a field in an attribute table? The Geometry functions available in the Field Calculator are for points. ...
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1answer
185 views

How to center the labels in QGis?

I have a shapefile containing some US sections from the Public Land Survey System. I would like to display the labels in the middle of the sections. I found the "Placement" option in the "Label" ...
2
votes
1answer
165 views

selectedFeatureCount vs featureCount?

I do from qgis.core import * layer = QgsVectorLayer(r"D:\file.shp", "boundingBoxes", "ogr") layer.featureCount() outcome is 428 layer.select(layer.pendingAllAttributesList()) ...
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2answers
55 views

In Quantum GIS, how do I specify the units for a shapefile?

I'm trying to create a shapefile of fields, drawing polygons around each field, and having the acreage calculated in the attribute table. I believe I have the projections correct. It's not coming up ...
2
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1answer
115 views

CRS Austrian Lambert/WGS84

I am totally new to Qgis (or GIS in total): My problem is to get two layers in same CRS to do an intersection and further analysis described in the blog of underdark (Groupstat tutorial). My is the ...
7
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1answer
189 views

How to access and/or manipulate table data in QGIS composer label?

When setting up a map to print using the QGIS Composer, how can I insert a label linked to a specific table record? I have been using the latest development build (1.9.0) which has the new Expression ...
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1answer
1k views

Can QGIS (1.8.0 Mac) rotate the entire view of a project?

Can QGIS (1.8.0 Mac) rotate the entire view of a project? that is, have north pointing in a direction other than up on the screen and on output? of course, while still allowing adding new layers etc.
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0answers
137 views

How to apply new WFS-Filter features like intersect

I was pleasantly surprised to find very much enlarged filter support in QGIS-Dev (1.9.0_Master). One application would be a WFS-Filter which combines $geometry and Intersect in order to load only the ...
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1answer
537 views

How to read the attribute values using pyQgis?

What is the way to get the information contained in the attribute table, say in column 2, row 2 using pyQgis?