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Questions tagged [qgis]

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

2
votes
2answers
1k views

How do I import specific coordinates from Namibia in QGIS?

I have a map here with coordinates from the Schwarzeck Map Datum Format 1903. They have the following format: y: 41 944,31 x: 363 810,71 I want these points to be pictured in QGIS... How is it ...
7
votes
1answer
2k views

Clean small artefacts from polygon shapefile

With some success, I've been generalising and cleaning Ordnance Survey OpenData VectorMap District woodland polygon shapefiles to make them fit for mid-scale mapping. However, the resulting ...
4
votes
2answers
2k 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.
54
votes
12answers
116k views

Creating point features with exact coordinates in QGIS?

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
1answer
604 views

Enter four coordinates and get a polygon in QGIS

Is it possible to enter four coordinates for getting a polygon? I have to clip lots of exact rectangles and I was just wondering whether you know a plugin
8
votes
2answers
8k 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
2k 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 ...
4
votes
1answer
7k 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 1.8.0-...
2
votes
0answers
928 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: ...
7
votes
2answers
4k 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: http://download.osgeo.org/qgis/doc/manual/qgis-1.1.0_coding-...
16
votes
2answers
2k 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 ...
2
votes
1answer
918 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.
2
votes
2answers
1k 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
189 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 ...
-1
votes
1answer
214 views

QGIS exporting shapefile 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.
0
votes
1answer
135 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.
1
vote
0answers
92 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
104 views

Opening GDB files using QGIS on Mac? [duplicate]

Possible Duplicate: How to get “.GDB” Esri File Geodatabase in Qgis for MAC OSX 10.6? I have some data located here: https://nycopendata.socrata.com/Facilities-and-Structures/Building-...
5
votes
1answer
2k 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 ...
7
votes
4answers
574 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 ...
9
votes
2answers
5k 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 ...
6
votes
5answers
16k 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 ...
8
votes
1answer
4k 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
545 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
617 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
401 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 for ...
1
vote
1answer
309 views

QGIS dxf2shp text angle problem [duplicate]

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. ...
5
votes
2answers
6k 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
7k 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
1answer
187 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 ...
4
votes
4answers
16k 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
151 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
83 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
104 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 to be published in the metadatatab next to the legendtab. Can somebody ...
0
votes
2answers
867 views

How do I intersect DEM and a polyline?

I'm working on QGIS, How do I intersect a DEM and a polyline to get the longitudinal section of a river?
18
votes
4answers
12k views

Finding centrelines from polygons in QGIS?

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.
1
vote
2answers
3k 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
293 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 -...
26
votes
10answers
43k views

Converting KML to shapefile without losing attributes using QGIS?

I have a KML file with hundreds of points. To each point there is information, such as Name, Power, Age (it's a map of hydroenergy powerplants). If I import that KML file to QGIS, this information is ...
8
votes
3answers
6k views

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

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 the client is requiring a small spatial database (...
1
vote
3answers
341 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
195 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 ...
7
votes
2answers
3k views

How to label raster cells using ArcGIS Desktop or QGIS?

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 pixels with the corresponding cost-value. ...
13
votes
3answers
8k 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
86 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 src/plugins/georeferencer/CMakeFiles/georefplugin.dir/...
1
vote
1answer
459 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 ...
17
votes
2answers
972 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
407 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 such table: views_goemetry_columns When I click in OK button, a second dialog ...
4
votes
1answer
10k 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 a ...
7
votes
1answer
3k views

How to create a custom data viewer on top of QGIS?

I was exploring the possibility of creating a simple Data Viewer based on QGIS. I would like to create an simple application that will open QGIS up with a limited set of tools & menus. QGIS would ...