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

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2
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0answers
2k views

QGIS: After performing a table join, all the fields are “NULL”

Within QGIS, I joined .dbf table containing population data to a shapefile of Census tracts. The join field is called GISJOIN in both the target table and the shapefile's table, and this attribute ...
2
votes
1answer
2k views

Instructions for installing Sextante plugin

As a follow-up to the question I recently asked on PyQGIS, can someone please point me to a document, webpage or thread that provides me with step-by-step instructions as to how to install an external ...
4
votes
2answers
1k views

How to average values in a point layer with respect to polygon layer in QGIS?

I am new to GIS and have the following problem: I have 2 layers: a point layer with a column that contains numbers (pollution index from specific measurement point) and a polygon layer with different ...
0
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0answers
1k views

How to move/edit labels? [duplicate]

I need to move/edit few labels in a job. How can I work on it? I am using QGIS 1.7.4 and the label option in the toolbar (not the layer options)
1
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0answers
361 views

QGIS Points to Path Plugin Date/time error [closed]

I would like to use the Points to Paths plugin to plot the tracks of collared animals, exactly as specified on this page http://spatialgalaxy.net/2011/12/30/qgis-plugin-of-the-week-points-to-paths/ ...
1
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2answers
368 views

How to re-calculate area, perim, p2a,width and length in QGIS?

I cut a part out of one feature and added it to another feature in a polygon shapefile. My problem now is that both features has the same values in the area-, perim-, p2a-, width- and length-columns? ...
0
votes
2answers
1k views

Issues with datasets when custom SLD loaded into geoserver

I have created my SLD's in QGIS and want to use them in Geoserver. I have imported and validated them without any problems but when I try to view the data using Layer Preview --> OpenLayers-->Go it ...
3
votes
1answer
848 views

Auto-increment id when adding a feature to a PostGIS layer in QGIS

when I enter edit mode of a PostGIS layer in QGIS 1.8 and add a feature, is it possible to auto-increment the ID? I always have to look what last used ID was and manually enter a new one. I can't ...
2
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1answer
616 views

How to keep the same style of a OSM map converted to SHP file

I saved a OSM file as a Shapefile, this is fixing my previous question how to handle bad layers. My question is how to retain the original style from OSM plugin to SHP files, when I copy the style ...
0
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1answer
246 views

Tools in the Sextante toolbox in QGIS 1.8 for interpolation?

What tools in the Sextante toolbox in QGIS 1.8 can be used for interpolation (kriging and spline)? I have looked at every single one and could not figure it out.
0
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1answer
454 views

How to calculate the area of the convex hull of a points layer

I have a shapefile in QGIS that I have created by importing a CSV of points, using Points2One to convert to a shapefile and then importing the shape. I am now trying to calculate the are of the shape ...
1
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1answer
2k views

How to append a vector layer using Qgis and Python?

I am working on scripting some data processing using Qgis and Python, but I'm running across issues that I need to debug. Since my data is really large, and run-times can be lengthy, I would like to ...
2
votes
1answer
353 views

How can I solve 'Handle bad layers' error when using OpenStreetMap in Qgis?

I can easy download Portion of maps from OpenStreetMap, save them etc. Once I reopen the same map I get a message that says "Handle bad layers" for all the OSM files. What I am doing wrong?
2
votes
3answers
532 views

Creating legend with new data defined symbols functionality in QGIS?

I have a large geology data set that I need to display using an industry standard set of symbols and colours. The symbols and colours are attributes of the data. I have been using the data defined ...
1
vote
1answer
387 views

QGis creating shape file of several points out of two Excel sheets

I am about to create a Qgis file on which it should be visible which companies are working together. As source I have got two Excel Tables. Table = Distribution Centers Table = Point of sales I ...
1
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0answers
31 views

How to Edit FileGDB attribute using QGIS? [duplicate]

I am able to attach a file GDB in QGIS (version 1.9). But I cann't edit it's content available in attribute table and 'Toggle editing mode' button was also disabled in Attribute table. Does anyone ...
3
votes
0answers
202 views

Why are my raster mean and standard deviation -1?

I have a set of about 25 rasters whose descriptive statistics I have been examining. The data in the rasters were calculated in Python and the rasters were created using Python-GDAL. In all but one ...
2
votes
2answers
480 views

What is causing this distortion in QGIS georeferencer results?

When importing a JPG map using QGIS's georeferencer plugin, the resulting map layer is distorted and does not look anything like the map that I am trying to import. I can't work out what is causing ...
2
votes
2answers
795 views

Why is QGIS Field calculator button greyed out?

I'm using QGIS to attempt to calculate the area enclosed by a set of points that I have capture used a GPS device. I have imported the coordinates from a CSV but when trying to open the field ...
3
votes
2answers
190 views

Is there a means of recording all user actions in QGIS?

Is there a means of recording all user actions in QGIS, in particular date/time of data access? Most of our data is in Postgresql which is fine, I can run logging from there and QGIS is recorded ...
2
votes
1answer
403 views

QGIS Dev install issues

I need to use some of the new functionality in the Dev build and just can not install it on our windows 7, 64 bit machines. It works fine on my personal windows 8 laptop but I can't get it to work at ...
0
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2answers
1k views

How to uninstall and re-install a stable version?

I just posted about a DEM problem after installing the latest nightly build...now I am completely screwed. I uninstalled the latest nightly build and associated files, hoping to resort back to the ...
0
votes
1answer
59 views

Qgis nightly build - DEM error

I installed Qgis 1.8 several months ago. It's been working like a charm. Earlier today, I decided to check out the latest nightly build. Installed GDAL 1.10 (already had 1.9 installed) and SQLite ...
7
votes
1answer
1k views

Can QGIS projects be opened in ArcGIS for Desktop?

I am about to start a project with a number of people for a nonprofit organization. I am wanting to create the files in QGIS, but some of the people that I am working with are city officials and might ...
1
vote
1answer
447 views

Looking for PyQGIS Syntax Examples/Guide

I am a long-time user of arcgis with intermediate experience python scripting for automation of geoprocessing workflows. I am moving towards using QGIS on the regular and I would like to dive into ...
7
votes
1answer
193 views

Open source implementation of “feature density” algorithm

I'm working on a dataset of house searches - 1 polygon for each area in which people want to find a house from an online search tool. This produces many overlapping polygons. It would be great to ...
1
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0answers
161 views

Unable to open project

I recently got a virus in my computer and, after having that fixed, was unable to open my Quantum GIS project. I received an error message: Microsoft Visual C++ Runtime Library Runtime Error! ...
2
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0answers
304 views

QGIS Atlas generation - crash dumped [closed]

In QGIS 1.9.0 there's a new funcionality named Atlas generation. Everything works fine until I start generating more 5000 images. Now, after some time (not always the same) the QGIS crashed with the ...
2
votes
0answers
240 views

Spatial Filter in Qgis Using Python

Is it possible to create buffer and get intersected features in Qgis using Python? I did in ArcObjects.but i need the same in QGIS also. Dim topo As ITopologicalOperator topo = chkPoint Dim sFc As ...
0
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0answers
118 views

Confusing offsets in shapefile written by QGIS/OGR

I think I'm stuck here. A shapefile has been updated in QGIS. Records have been deleted and those records have been marked with an asterix in the first byte of the record in the dbf file. I open the ...
1
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0answers
132 views

Oracle spatial. Cannot load data

Have just installed QGIS 1.9 with Oracle spatial abilities. We maintain geodata in an Oracle 9.2. spatial database. I get connected to the database but I can not load the data. The table shows up ...
0
votes
2answers
2k views

Save Google maps as ecw or tiff

I've downloaded this Google Maps XML: http://ttmaps.free.fr/files/google_maps_20.xml I can load it in QGIS, for example, and view it as a raster. I want to save an small area (a town) in an ecw or ...
0
votes
1answer
130 views

How to select all cities in Germany from city and country layer?

I have 2 layers: layer_1: countries of europe, layer_2: cities of europe I want to create (and then save) a layer_3 which would be all the cities of Germany. Is there any good tutorial of how can i ...
0
votes
1answer
59 views

Join Text File with lat/long in a shape file without a field in commom with QGIS 1.8

I'm using QGIS 1.8. I have 3 files: a shape file from a state, a csv file with a commom field with this shape file and a third file (csv, with long/lat colums). In this third file. I have a column ...
2
votes
0answers
40 views

XYTools truncating decimals on export to excel

Is there some sort of setting to prevent XYTools from truncate decimals when exporting a shapefile to excel? I live in Sweden hand we normally use comma as decimal point. Even if I change the setting ...
0
votes
1answer
173 views

Is there a way to convert multiple columns at once from string to text, or to other data formats?

I have multiple data fields that need to be converted from string to text files. When I save them as "text" in excel or open office, they still load up as string files in QGIS. How can I convert more ...
0
votes
0answers
80 views

Changing projection does not change map extent

I have a shape file with a UTM projection. I want to save the data to a new shape file with a lat/long projection for a mapping system that only can deal with lat/long projections. I open the UTM ...
0
votes
2answers
670 views

QGIS identify each layer type in legend i.e point polygon line

i am developing a qgis plugin, while i can get the the general type of layer i.e vector or raster using this code vectorCount =0 pointCount=0 lineCount=0 polugonCount=0 rasterCount=0 layers = ...
5
votes
2answers
600 views

How to run two versions of QGIS simultaneously

I really enjoy seeing the new features and icons of QGIS 1.9 nightly versions. It's looking fantastic, and some features are already very useful for my work. However, it is inherently less stable ...
2
votes
1answer
1k views

Getting polygon shapefile node coordinates and point order

I am trying to get the coordinates of each node of a polygon in QGIS. What I basically did is use the following tools: Vector -> Geometry tools -> Extract nodes Vector -> Geometry tools -> Export ...
0
votes
0answers
74 views

How to change selection tolerance for WMS/WFS in QGIS?

Does anyone know if there is any equal function to the selection tolerance (ArcMap) in QGIS. I have a problem activating points in my WMS/WFS. The "selection tolerance" function solves the problem in ...
0
votes
1answer
197 views

Issues with hotlinking in QGIS

I want to create hotlinks to open excel and image files but am having issues. I fixed the issue with opening excel files by adding "" cmd /c start excel.exe /r "[% "Excel" %]" However I can't get ...
2
votes
1answer
138 views

Missing Polygons when importing a previously exported shapefile using QGIS (mmqgis plugin) Geometry Export to CSV.

I've obtained the following file from the US Census Bureau. ftp://ftp2.census.gov/geo/tiger/TIGER2012/UNSD/tl_2012_42_unsd.zip I've been working with these files and have noticed some issues with ...
0
votes
0answers
175 views

QGIS 1.8.0-Lisboa error message when converting DEM to Contours

I am trying to convert a small DEM (1 megabyte) into contours. When I go to - Extraction - Contour- and run it I get the following message: "ERROR 1: CPLRealloc(): Out of memory allocating 416 ...
2
votes
1answer
177 views

QGIS and SpatiaLite database: Setting user access permissions

SpatiaLite databases seems to match all my desires to store GIS layers and table. But an important question is: is it possible to limit writing to only one user ? If yes, what is the way to do it? I ...
0
votes
1answer
188 views

QGIS create point data attribute as the name of the polygon it falls in

I'm working in QGIS with a point data set overlaying a farm with 140 fields. While I can analyse the points from each field individually, I would rather use an awk script to calculate statistics I ...
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1answer
332 views

qgis how to split a field into field1 and field2 - comma is separator

How to split a field into field1 and field2 - comma is separator in field? Tryed to use field calculator /Jan
1
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1answer
888 views

How to export x/y coordinates from geodata?

I am a novice about Geographic Information Systems. Now I want to get real line segment dataset to do an experiment. So I searched it, and found the site that includes the real data: ...
5
votes
0answers
237 views

How to write an address search plugin?

I am migrating some users from MapInfo to QGIS, and before they sign off on it, they want a very simple address search in the same way that we currently have one working in MapBasic. I;ve been having ...
11
votes
5answers
8k views

How to create points in a specified distance along the line in QGIS?

I want to use QGIS creating points along the line, but in specified distance. I found two GRASS tools in SEXTANTE Toolbox: v.to.points v.segment I tried v.to.points, setting the maximum distance ...