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

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1
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1answer
828 views

Change coordinates of a polygon

I wanted to know whether it is possible to change the coordinates of a Polygon by typing them in. I don't want to have to manually drag them into the right position.
14
votes
5answers
14k views

How do I create point features with exact coordinates?

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: -Add point, type ...
3
votes
2answers
2k views

Adding georeferencing data into tiff image

I want to create a georeferenced .tiff file from a .png file. So I convert the .png into a normal .tiff file using the following command line : convert image.png image.tiff Here, all works fine, I ...
2
votes
1answer
472 views

QGIS identify features button issue

Is there anyway to get the Identify Features button in QGIS to automatically select a layer and provide the information without having to highlight it first in the layers TOC? MapInfo and ArcGIS ...
2
votes
1answer
1k views

How to save a vector layer from QGIS to Sql Server 2008 or 2012?

using QGIS, i've loaded up some administrative boundary data of New Zealand. I wish to now import this vector data from QGIS into my Sql Server 2012. Is there any way to do this with QGIS ...
1
vote
0answers
320 views

QGIS: opening a shapefile without an exclusive file lock [closed]

UPDATE: I did some analysis of what happens with the locking and it looks like QGIS doesn't use an exclusive lock. It just requires (non-exclusive?) write lock to the file. So this C# code fails: ...
5
votes
1answer
742 views

Where can I find documentation on QGIS C++ Plugin Development?

Is external C++ plug-in support available for QGIS? I'm having a really hard time getting started here. I followed the doc here: ...
1
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0answers
81 views

Why does Rotate Point Symbols tool not work on QGIS 1.7.4?

I'm having trouble with Rotate Point Symbols tool on QGIS 1.7.4, installed via the standalone installer. It just doesn't work. I can see the button on the Advanced Editing toolbar and in Configure ...
12
votes
2answers
550 views

Need a spatial database that can be used by QGIS and R

I'm quite new to QGIS and I'm searching for a simple way to create a Database that allows me to use the tables in QGIS and R. I have a lot of data stored in Excel spreadsheets wich will be used for ...
1
vote
1answer
429 views

Problem with Orfeo Toolbox integration in QGIS

I'm getting this error: OTB execution console output '"C:\OSGeo4W\bin\otbcli_MeanShiftSegmentation"' is not recognized as an internal or external command, operable program or batch file.
0
votes
2answers
428 views

How can I remove the menu bar in QGIS?

I want to create a clean user interface for my students to use QGIS. I tried to remove the menu bar using the customization in setting but I am not able to remove everything, e.g. Database, plugin, ...
2
votes
0answers
119 views

How can I trace an ANALYSIS_EXPORT error when building QGIS?

When building qgis1.8 using QT 4.7.4, I encountered the following error. I am unable to trace it: src/analysis/raster/qgsrastercalculator.h:31:24: error: variable ‘ANALYSIS_EXPORT ...
0
votes
1answer
89 views

QGIS exporting shapfile with proper projection

Can someone walk through the proper way to set a projection and export the shapefile so it will properly open up in another GIS program? I'm having trouble.
-1
votes
1answer
116 views

Deleting large portions of shapefile

I'm have a huge shapefile and I'm trying to delete large portions of it. I can't seems to do it in the edit mode. Can someone please walk me through this process? I'm using QGIS 1.8.
4
votes
1answer
456 views

How to Create a raster layer from a numpy array using pyqgis?

I am working on a plugin for Qgis to calculate spatial Kernel density maps. I have all the calculations working, all I am missing is a way to turn a Numpy Array, with density values into a multiband ...
1
vote
0answers
57 views

Can't open exported data

I downloaded data here: https://nycopendata.socrata.com/dataset/Pavement-Edge/gydf-ksfn I opened this up in QGIS but when I export it I can't open it up in another GIS program called indiemapper. ...
2
votes
0answers
48 views

How to open GDB files using QGIS in a Mac? [duplicate]

Possible Duplicate: How to get “.GDB” Esri File Geodatabase in Qgis for MAC OSX 10.6? I have some data located here: ...
4
votes
1answer
822 views

Using QGIS calculate distance of point along a line

I have lots of points, and a road (lines) and I would like to calculate from point A to point B (the distance must route through the roads (lines). I found this QGIS calculate distance of point along ...
6
votes
4answers
293 views

How to avoid holes in polygons from lines?

I am trying to convert a dataset of lines that contains the coast of New Zealand into a big polygon. However using the vector -> geometry tools -> lines to polygon command in Quantum GIS results in a ...
8
votes
2answers
2k views

Converting ms-access database into easy to use spatial database

I've recently come into ownership of an MS-Access database (2007 accdb), which I want to be able to use in a GIS. I know a little bit about GIS (I've used QGIS and ArcGIS quite a bit) but very little ...
4
votes
2answers
2k views

Measuring the distance between lines and points in QGIS

Using QGIS - I have a vector of fault lines. I have point data in the form of a csv which I have also loaded into QGIS. I need to know how far each point is from the nearest fault line then enter ...
4
votes
1answer
574 views

Retrieve path and file name of current qgis project in python

Is there a way to get the path and the file name of the current project from a python script? I'm currently trying to develop a python plugin for qgis and I need to create a file with a similar name ...
3
votes
3answers
225 views

How to compare a set of images with a shapefile?

I have around 150 images (rasters), each one is just a map of certain "classes", e.g. pixel value 1=forest. I also have a shapefile that consists of roughly the same area as the 150 images constitute ...
1
vote
2answers
177 views

How to get only one feature from MySQL?

I would like to get only one feature from a MySQL database. What am I currently doing? I use the Add Vector Layer functionality in QGis to get the features (polygons) from the MySQL database. They ...
1
vote
1answer
214 views

How to change the path to the mysql socket in Quantum GIS?

I would like to use Mysql in QGIS. But when I want to create a new connection to the database (Add Vector Layer), I can't connect because QGIS is looking for /tmp/mysql.sock But I'm using XAMPP ...
1
vote
0answers
168 views

QGIS dxf2shp text angle problem

I am trying to convert from dxf to shp. Any text layer when converted has attributes including text, height, and angle. The angle is in radians, and I can see that it is in degrees in the dxf file. ...
3
votes
2answers
1k views

Can QGIS automatically load an SLD with a Shapefile?

I have SLD's/lyr files with my shp/gdb files. They all have the same name except for the extension. Is it possible for me to force qgis to load the sld with the shp so that I don't need to manually go ...
0
votes
1answer
1k views

How to export data from QGIS to display in Google Maps?

I'm exporting layers of a project for a quantum gis postgis table and visualizing the data in gmaps, but the coordinates are very wrong. is there any special way to export the quantum gis? postgres ...
0
votes
0answers
934 views

Lat/long grid in QGIS using WGS84 projected layers [duplicate]

I'm using QGIS to project some shapes that are in WGS84 coordinate system. I want to add a grid to the map in the map composer but when I try to do it the degrees don't show up. I have tried to do ...
0
votes
1answer
123 views

Coloring pixels based on values

I have an image where pixel values are integers, they go from 0 to 6 and I also have some 999. I want the value 999 to be transparent, which I could achieve by myself. I would like values 0 to 6 to be ...
2
votes
3answers
5k views

How to import shapefiles into MS SQL 2008 and then view that data using QGIS?

I'm a QGIS users but not a database person and I need some help on the DB side. I'm currently in the need to import several shape files into MSSQL 2008 and I have no clue how to do that and my IT guy ...
0
votes
2answers
128 views

creating one tree to many observations in qgis

Looking to create a database for QGIS where each point represents a tree (with name attribute) and another table of observations about each tree over time. Ideally I can update tree location in QGIS ...
1
vote
1answer
68 views

stacked colours according attributes

I have a hierachical List of attributes e.g. column (1) S (2) SD (3) SD0 or (1) A (2) AN (3) An1 etc. So there is one S with several SD s and several SD0 in the attribute table. When I display column ...
0
votes
1answer
72 views

How can I enter metadata into a qgiscloud project

I published a project into qgiscloud: https://qgiscloud.com/tragewegen/IDEAproject_DonkeyMobileBlackCarbon. I want metadata be published in the metadatatab next to the legendtab. Can somebody tell ...
1
vote
2answers
352 views

How do I intersect DEM and a polyline?

I'm working on Qgis, I need the longitudinal section of a river. Thanks
4
votes
3answers
1k views

Finding centrelines from polygons?

I was wondering if there is a way to create centre lines from polygons in QGIS? I have a polygon layer, but ideally need the centrelines as a separate file. Thanks, Alan
0
votes
2answers
650 views

How to find the proper coordinate reference system with two sets of data using different measurements or too convert one system into another

I have two different entries of data in two different spread sheets. One of the spread sheets uses a coordinate reference system that I have no idea what the units of measurement are. the properties ...
0
votes
0answers
197 views

QGIS Georeferencer and Coordinate Systems

I'm having an issue with Ubuntu and Windows versions of QGIS where the georeferencer does not properly assign the coordinate system to the output raster. When I assign the output CRS to 'EPSG:900913 ...
12
votes
9answers
14k views

How to convert KML to shapefile without losing attributes?

I'm new to QGIS and all geoinformation itself but have to work on some difficult stuff. I have a KML file with hundreds of points. To each point there is information, such as Name, Power, Age (it's a ...
6
votes
2answers
1k views

Is there a way to create a Personal Geodatabase in QGIS?

I believe I know the answer, but I wanted to ask. Is there a way to create a Personal Geodatabase in QGIS? I know QGIS can view Personal Geodatabases, but can one be created? I have a project where ...
1
vote
3answers
166 views

How can I save a column from the attribute table of a vector layer to a variable?

I am trying to write a python plugin for QGIS that can convert three vector layers into an object File for an urban climate model. Unfortunately I am stuck again with a possibly easy question: How ...
5
votes
2answers
154 views

Why the modifications I do in QGIS doesn't appear when I save an OSM file I created?

Through QGIS I loaded an OSM file I created and I'm trying to visualize what happens with the file in terms of codes after some modifications like adding points, lines or polygons. But the problem is ...
6
votes
2answers
446 views

How to simply label raster cells?

I think the title says everything but: I want to generate a small sample raster (eg. euclidean distance or cost distance) to explain the method of cost-distance analysis, and I'd like to label the ...
6
votes
2answers
2k views

How to change null values raster values to 0 in QGIS?

I need help... I'm having problems with QGIS. I have some rasters that appear to have null values, even though I reclassified them to obtain a boolean raster :( How can I change the NULL values to 0?
2
votes
1answer
62 views

Problem compiling QGIS against trunk - georeferencer

I got problems compiling QGIS (trunk) this morning. The georeferencer seems to be the source of the problem: [ 81%] Building CXX object ...
1
vote
1answer
369 views

How to get back closed panes in QGIS 1.8?

I was using the map composer in QGIS 1.8 in Mac OS X 10.6.8 today and closed a couple of the object attribute panes on the right side of the map composer. However, I can't find a way to get those ...
2
votes
0answers
324 views

How to access mysql data from python built-in console?

I'm writing a QGIS Plugin, and somewhere I want to present data from a MySQL database. It's simple data(strings,etc), not Geospatial, or vector data. I'm familiar with querying databases from python ...
15
votes
2answers
518 views

What should QGIS course for advanced ArcGIS Desktop users cover?

I will build a 16 hour (2 day) course on QGIS for ArcGIS users. The target users that breathe and sleep ArcGIS. As we're trying to reduce our costs, we're thinking of switching some people to QGIS and ...
0
votes
1answer
298 views

Problem in Spatialite database creation

When I try create a new DataBase, Spatialite plugin return the dialog error box: The SQL query seems to be invalid. no suck table: views_goemetry_columns When I click in OK button, a second dialog ...
0
votes
1answer
2k views

How to convert a regular point grid to raster? [duplicate]

Possible Duplicate: How to convert a point grid to a raster? I´d like to convert a regular grid (25 meter) of points (XYZ) to a raster. I have tried the GRASS-tool r.in.xyz but I always get ...