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

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285 views

QSpatialite : import multiple TXT/CSV

I'm using QSpatialite only. I don't have spatialite-gui neither the shell. I want to import multiple TXT/CSV at one time. How is it possible to do that ? I found nothing on the internet. Thanks
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50 views

How to work around “OGR-failure while deleting field 13. Invalid field index”?

this post might be related to this one: QGIS Field Calculator Results Removed When Saving Edits But there is no suitable answer for me It is not allowed to ask another time in the other post I ...
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4k views

How do I import AutoCAD [DWG] drawings to QGIS [SHP] using the right CRS settings?

We did some topographical surveys in Indonesia which are drawn in AutoCAD. It's our aim to publish them with QGIS and its webclient. I thought the best way is to georeference the data in AutoCAD ...
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826 views

Where are the 3d analyst tools available in QGIS?

I want to know whether we can perform 3d analyst in Q-Gis? If yes, means where is that option present?
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2answers
178 views

Measurements across UTM zones, how to apply spatial parameters to a customize a projection?

I have a survey grid that spans 3 UTM zones. Using http://www.epsg-registry.org/ I can get an indication of what projections are available. Where can I find more info on the patterns of distortion ...
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382 views

Can QGIS read ESRI TIN file directly?

Can QGIS open directly a TIN file generated with ArcGIS?
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1answer
117 views

Quantum GIS Standalone Browser

I don't think the QGIS standalone browser is working right on my computer. The only tab I can view is Param. The Metadata, preview and attributes tab are all grayed out. When I select a .shp for ...
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135 views

Image map plugin not working with point data QGIS

I have a point shapefile and I am trying to create a html image from it using the html image map plugin; however, I can not get it work. I get the error: Wrong geometry type Any ideas on this? ...
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83 views

How do I prevent QGIS 1.8.0 changing my dbf table values when joining tables?

Im a newbie on GIS as well as QGIS. I have a table of data saved from Excel as dbf format. After dragging and dropping the file into QGIS and then opening the attribute table, all values less than 1 ...
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131 views

QGIS Layers Not Lining Up

I am new to QGIS, I have been using ArcGIS for most of my maps. I have two layers that are not overlapping properly. One is a shp file from a GIS clearinghouse and another from a delimited text ...
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71 views

Get the ID of polygon in edition sessions of QGIS?

I did a Qt custom form for QGIS which contain a QlineEdit that must get the ID of the current polygon in edit session. For example, I start edit sessions I draw 3 polygons when the Qt form is opened ...
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135 views

What does “Computed -srcwin falls outside raster size” mean when clipping?

What does this mean, when I try to clip and save the result as a sqlite or other format please? "Computed -srcwin falls outside raster size of 7807x4771" cheers, Bruce
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73 views

Why is my custom QGIS repository not working in recent qgis-dev version?

I have a custom QGIS repository that worked well with my own plugins.xml on a private server. Yesterday I downloaded and installed the newest QGIS-DEV that now include some changes in the Python ...
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288 views

What do I need to do to add a new QGIS project to qgis-web-client?

for weeks I'm trying to get QGIS Server with qgis-web-client to work but I'm totally stuck. System is Debian Squeeze. In principle, I get QGIS Server and the qgis-web-client up and running: it's ...
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2answers
59 views

Discontinuous elevation contours at boundary of CanVec datasets

I am using Quantum GIS and I am working with the elevation contours from two adjacent CanVec datasets. The problem is that many of the contours' endpoints at the shared boundary do not coincide with ...
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1answer
206 views

QGIS offset dash line style - dash spacing does not vary with rotation

I'd like to make a USGS-style dirt road marker but with smaller dashes and bigger spacings (i.e. less duty cycle) to indicate lower quality road. First attempt = two simple lines, custom dashes of ...
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1answer
269 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 ...
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1answer
69 views

Combining shape files and exporting

I am new to QGIS and I need to know if if is possible to merge 2 shapefiles that do not have a common field and then export to Excel. Example of shapefiles: Countries broken up in to Municipality ...
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1answer
105 views

How to paste pictures into data frame?

I have a polygon feature class and I want to trace (select with a polygon) a picture that is solely comprised of a couple of interlocking letters. In ArcMap when I would do this I would simply drag ...
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2answers
49 views

Cannot See Georeferencer Results

I am working in QGIS 1.8.0 Lisbosa. Currently I am trying to georeference a building blueprint in a .TIF format to a Google Streets layer. After selecting four points (the corners of the building), I ...
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683 views

Printing High Resolution Open Maps?

I hope my question does not silly but I am QGIS rookie and am really struggling to find a solution. I have the added the Google Street Layer to my project on top of which I worked with my points and ...
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1answer
333 views

Import garmin Topo map to QGIS

I would like to import my Garmin Topo Maps to QGIS. I want to use the Topo Map as a Layer to create Shapefiles. Can anybody tell me if it is possible to import the Garmin maps including waypoints as ...
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1answer
149 views

QGIS 1.8 tries to use UTM in spite of geo projection file

I'm wrestling with a problem that I am sure I've created for myself, but cannot resolve. I received a set of shapefiles that were expressed with UTM, and I want them to use lat/lon. QGIS will do the ...
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3answers
705 views

How to setup a debugger for QGIS Plugin development?

As the title of the question implies, I wish to know how to set up a QGIS Python Plugin Debugger so that I can develop plugins more efficiently. Any information regarding this would be much ...
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1answer
70 views

Error output with gdalwarp

Following is my raster file and mask shape file files I use qgis 1.8.0 to clip the raster with shape file by gdal tools but after I run warp in gdal tools it's just give me no data in the output ...
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70 views

Qgis 1.9 issues with python [closed]

I already installed the version 1.9 of Qgis and when i runned e Script python on i could this error 'NoneType' object has no attribute 'children' however it works fine on qgis 1.8 could someone ...
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211 views

Why does the Clipper tool lack the mask layer option?

Fairly new at QGIS, but everything's gone well so far. I'm running QGIS version 1.8 on a Mac (OSX 10.8) and GDAL 1.10, and other GDAL tools (like Merge and Georeferencer) work just fine. When I ...
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69 views

For each polygon, return yes/no value if it intersects another layer

I have a polygon grid overlaying several other polygon vectors. I wish to visit each polygon in the grid and ask yes/no if each of these layers fall within the grid cell or not. I can do this easily ...
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1answer
39 views

How to cycle thru items in print composer?

In print composer I have many items placed on the "paper". These items include borders, one map, bar scale, logo and an arrow. When the items overlap each other I am only able to select the item on ...
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73 views

How do I put label inside polygon at any scale in QGIS 1.8.0

I would like to put labels inside polygon anytime and any scale. I'm using "Labeling" from the toolbar. Although I tried all types of the placement from the advanced tab, some labels still fall ...
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1answer
539 views

Rasterize vector layers with different extents into identical raster grids with QGIS

I am working on a quite simple spatial potential analysis using QGIS. I have some ArcGIS knowledge, but I am new to QGIS. My task is to identify the functional inner city of a region based on ...
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1answer
167 views

how to rename the band-names of a layer stack?

I created a layer stack of 20 images (all GTiff-files) using the gdal_merge tool in QGIS, available at: raster > miscellaneous > merge The result is a GTiff layer stack of the 20 images, but ...
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237 views

Pseudo Mercator error?

I'm mapping on QGIS, I have a vector layer and his CRS is on EPSG:4326 - WGS 84, but also I wanted to put a satellite image, so when I do it, the image use WGS 84 / Pseudo Mercator. The problem is, ...
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137 views

How to symbolize more than one attribute simultaneously in QGIS?

Each symbol can show different properties such as temperature and pressure, etc. I want to change the symbol color according to one property and size with another one. How can I do it in QGIS? Thanks! ...
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2answers
537 views

How to calculate Image boundary / footprint of satellite images using open source tools?

I'm referring to this question&discussion: How do I create a shapefile showing footprints of Rasters? I need to create the polygon outlines of several single layer raster images, not the ...
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1answer
70 views

looking for datum to georeference maps of 19th century Maine

I am trying to georeference 3 (1840, 1844, and 1877) northern Maine maps. I really am not able to find which datum to use. Can anyone point me to a list of historic and regional datums? thanks
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1answer
249 views

Extraction of contour lines starting from 0 elevation

I need your help regarding extraction of contour lines in QGIS. I am new to QGIS (in GIS actually). I followed the tutorials on extracting contour lines from DEM (which I downloaded from cgiar.srtm) ...
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1answer
723 views

QGIS - “Bad Allocation” Exception - on identify

I have QGIS (v1.8) set up to identify in Top down mode. When I use the identify tool on the map, I frequently get a Bad Allocation exception message and I was wondering what gives rise to this error. ...
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1answer
372 views

spatialite.dll with Python and QGIS - the specified module could not be found

I'm having a bit of a nightmare getting to the bottom of this DLL loading problem. The stand alone script works absolutely fine but the exact same code does not work within QGIS. import sys from ...
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1answer
104 views

how do i assign values to shapes to be displayed in my map

I apologize for the simplistic nature of this question, I'm VERY new to QGIS. I'm trying to use QGIS to display political information. I have a map of my state, with each town as it's own shape. I ...
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1answer
115 views

Worsened image quality and false colours after georeferencing

When I georeference a map of vegetation types (about 20 colours, each representing a certain vegetation) the quality of the georeferenced map is really bad and some colours have changed (e.g. black ...
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2answers
259 views

define a datum and meridian in a CRS in QGIS

I have a shapefile defined by the source as: "The layer is in geographical (lat-long) coordinates (GCS_Clarke_1866; Datum: D_Clarke_1866; Prime Meridian: 0)." opening the shapefile in QGIS 1.8 the ...
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2answers
212 views

QGIS on Mac WKT import problem

QGIS 1.8.0 Mac OSX 10.6.8 These problems seem to be specific to Mac, as two Windows users don't have the problem. Import a file as a vector: TEST.CSV id;wkt 1;"POLYGON((10 10,20 20,20 30,20 ...
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387 views

Flow mapping visualization using a road layer

I am trying to illustrate travel using a flow map on a road layer. My data is: city of origin destination number of travelers I would like to use a polygon city layer (or point) and a road layer, ...
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1answer
288 views

How to “Merge Selected Features” with python?

I have been looking for the answer to this question for some time now, but can't seem to find it! My problem is straight forward: I have one layer It contains lots of features (only polygons), say ...
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1answer
113 views

Digitized vectors don't match while zooming [duplicate]

I'm trying to digitize in QGIS with Google Maps as the background. Digitizing with constant zoom works fine. But if the zoom is changed, the digitized vectors don't match the Google Maps background ...
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69 views

How to combine use gradient symbols for layer properties excluding 0?

I want to visualize my data by using graduated symbols. Now, there are some objects with value "0", they should not be printed on the map (which I solved by using rule-based symbols). But, anyway, "0" ...
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2answers
213 views

Multiple labels in QGIS QML

I've a GML file from the Ordinance Survey which includes a Cartographic Text layer which I'd like to load and render in QGIS. The layer has attributes which are intended to be use for the font size, ...
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1answer
72 views

Problem with labels on export/print a map (qgis master) [closed]

As you can see on the images below, the labels on the exported map (right) are much bigger then in the original map (left). Same by pdf, image, and vector - export. Whats the problem? Can I fall ...
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163 views

pgRouting:how to use reverse_cost?

I add a new column, naming it "reverse_cost", and give it the same data in the shape_leng column. But as I run the shortest path algorithm in pgadmin, I got an error message. here's my sql code ...