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

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3
votes
1answer
228 views

qgis delaunay circumcircles

Is it possible to show the delaunay circumcircles in QGIS? I know how to make the Voronoi polygons and Delaunay triangles. I found a web page that shows the circumcircles at: ...
0
votes
3answers
764 views

QGIS 2.0 text delimited layer importing data as single row

I'm trying to import a text delimited layer using lat/lon, but the tool interprets the data as a single line. I've tried saving my csv using several different programs (Stata, python editor, text ...
1
vote
1answer
158 views

QGIS Grass Plugin fails with r.cost.vect

I tried the following in QGIS with the Grass Plugin: r.cost input=preCostSurface@albi start_points=OSMroads@albi output=cost0109 max_cost=0 And I get the following error: Dev note: Adapted sites ...
1
vote
0answers
244 views

WFS connect SSL handshake fails

I'm running geoserver on my own server at home. Everything works great usually but when I try to connect to WFS from QGIS over https I get a warning saying SSL Handshake Failed. This is probably ...
2
votes
1answer
121 views

Georeference image is mirrored

I'm working with QGIS and I'm trying to geo-reference a tobin lease map. The map datum: NAD27, projection: UTM Zone 14N. The process to georeference is fairly straight forward but the results I'm ...
2
votes
1answer
179 views

Why do area measurements from “measure area” tool and field calculator differ?

My problem is when using the "measure Area" tool on the toolbar I get the correct value but when using the field calculator in the Layer Attributes the area is very different including -ve areas. ...
1
vote
3answers
4k views

How to create points based on the distance and bearing from a survey point?

I am plotting witness tree data to calculate pre-settlement tree density. I have a shapefile with points along section lines (square miles) at each half mile. I am making another table that contains ...
1
vote
2answers
158 views

geoprocessing across multiple vector layers QGIS2

I have 6 layers of point data (each layer is one year), where data in each layer are distributed throughout a grid, and the grid is identical in each layer. I'd like to extract data from each layer, ...
1
vote
1answer
395 views

Select by SQL in QGIS Python

In the GUI there is the Query Builder, but that does not seem to be easily available in Python. The processing (SEXTANTE) module has the qgis:selectbyattribute algorithm, but that only supports ...
1
vote
0answers
166 views

How to find out Why a QGIS plugin is rejected for Version 2

I have a selection of python plugins (one rather large one) that I have developed under Qgis 1.8 and that I am migrating to qgis 2.0. The error that the Plugin Manager gives me when I load these ...
2
votes
1answer
201 views

how to use “data defined override” in qgis 2.0?

How can I use the new "data defined override"-funktion in qgis 2.0? I did not find any further information about it in the handbook an somewere else. I want to label my layer with different front ...
2
votes
1answer
285 views

Raster terrain analysis on QGIS 2.0.1 - No curvature analysis?

I need to perform a curvature analysis on a DEM. I've found this tutorial ...
1
vote
1answer
292 views

How to calculate the intersect two shapefiles [duplicate]

I have two shapefiles. 1. the clinic buffers 500m area. 2. the postcode area. Is there a simple way to calculate the intersect two shapefiles ? I'm using QGIS Dufour. I tried to use fTools to ...
2
votes
1answer
146 views

Reprojecting Natural Earth dataset to World Eckert I

My question is connected with QGIS 2. Could anybody explain me how I ought to reproject the Natural Earth dataset there in order my world map to look correctly? When I strive to reproject these data I ...
1
vote
1answer
275 views

How to automatically update coordinates in print composer?

I tried "$x" and "$y" for coordinates but it always give me zero "0" values too, and what I really want is to display the coordinates like in this image.
4
votes
0answers
64 views

Using QGIS plugins from Python [duplicate]

Is there a simple way to automate calls to QGIS plugins from a QGIS Python script? Either from console or a plugin? I am ideally looking for a way to specify input/output parameters and bypass GUI. ...
1
vote
1answer
110 views

How to calculate the area of raster catchment zones?

I have a raster with irregular shape and I need to calculate the area. The "classic" method (Vectorize+field calculator) didn't work, it makes thousands of polygons. Any ideas? Thanks a lot!
4
votes
0answers
176 views

How to select features based upon multiple values in graphical modeler?

I'm trying to create a basic model using QGIS, the QGIS graphical modeler and the sextante toolbar. In part of the model, I need to select features based upon multiple attribute values (for example - ...
2
votes
1answer
114 views

QGIS layers don't overlay after trying 'enable on the fly' and CRS settings

I know there are already many questions about this topic, but none of the answers helped me so far. I have two layers I want to overlay in QGIS. One of them is an Excell file with the coordinates of ...
1
vote
2answers
790 views

How to remove z & m coordinates from shapes with QGIS? (Or arcgis, grass, gdal, Python…)

I've recently received some parcel data in shapefile format that has z & m coordinates (all = 0.0). The WKT for a typical parcel looks like this: "MULTIPOLYGON (((2672464.560700002 ...
2
votes
2answers
646 views

QGIS 64-bit ODBC set up link to 32-bit Access on win7

I am trying to set up a an ODBC link to Access 2007 32-bit but not having any success. My system is a win7 pro 64-bit and I have QGIS 64-bit installed. Here are the steps I have already tried. Set ...
0
votes
1answer
379 views

problem in loading outputs from processing tool (sextante) [duplicate]

hopefully some of you have got an answer to what happens to me when i run (so far) all the processing tools for carrying out raster analyses. This is the type of message i receive from QGIS (2.0.1 ...
3
votes
2answers
1k views

How do I create a shapefile of polygons from points in a spreadsheet?

I have a spreadsheet that has 100 different polygons listed with UTM coordinates for the 4 corners of each polygon. I want to turn the spreadsheet into a shapefile with 100 unique objects, 1 for each ...
0
votes
1answer
105 views

How to display NoData of a raster in QGIS

How can I show raster pixels with NoData value in QGIS? In ArcMap there is a button to choose the color for the NoData value. Is there something like this in QGIS?
1
vote
1answer
270 views

How identify Layer name when removing it from legendInterface qgis?

I am trying to connect the removing layer action with a slot for doing some processing after that. I already try this: QObject.connect(self.iface.legendInterface(), ...
1
vote
1answer
93 views

Draw an item from coordinates in QGIS?

Is it possible to draw a line or to draw a triangle or another figure by digit the coordinates of the vertex? I use QGIS 1.8 on windows 7 system.
2
votes
0answers
230 views

how to make decent sense from scattered river depth measurements

I sampled river depth at scattered positions and I want to be able to make a map and GIS layers out of it. My problems are: As the river meanders the interpolation I do in scientific packages i,e. ...
0
votes
0answers
190 views

Maxent out of bound error?

I selected my climate data from wordclim ( tile 29 ) and then used QGis to convert the data to .asc format . My occurrence data is in degree decimal.But when I run Maxent on any layer it says that the ...
2
votes
1answer
200 views

How to multiply raster DEM with a linear graph value

I would like to multiply my Raster DEM with a linear graph value y = mx + C. The graph values look as follows: I want to make a new raster where each cell will represent a damage factor from ...
1
vote
1answer
100 views

QGIS 2.0 Can I get panels to display as tabs

I recently got myself very confused by getting the "Layers" panel hidden under the "Layer order" panel and then spent hours wondering why I could no longer right click on the layer to get the menu. I ...
1
vote
1answer
85 views

Merge two vector layers with different granularity

Beginner at QGIS here. I have two vector layers. One represents country boundaries for the whole world. The other one represents region boundaries, but only for OECD countries. I would like to ...
6
votes
2answers
337 views

Can QGIS Trace Features?

I generally have an doubt about QGIS. Is it possible to Trace the feature in QGIS? As in the case like ArcGIS for Desktop which has a tool called "Trace" in its Editor Toolbar? If yes, how we can do ...
1
vote
2answers
212 views

County-Level Ethnic Shapefile: United States

My professor usually provides the shapefiles that we deal with in our analyses of the United States--population, votes, etc., but I'd like to know how I can get these myself. I'd like, in particular, ...
2
votes
1answer
393 views

pyQgis in stand alone script, vector loading error

I am trying to use the Qgis functions in a stand alone Python script. I m running Mountain Lion OS, 2.7 Python & the Qgis 2.0.1 Dufour. My main problem is that I cannot get started - I cannot ...
2
votes
2answers
191 views

How to run QGIS server on EC2 micro?

I'd like to learn something about web maps and so decided to start out using EC2, following different tutorials I was able to start a micro instance but I can't find my way on how to get qgis server ...
2
votes
1answer
435 views

Using a shapefile in QGIS makes it unusable in ArcGIS?

We currently use Arcgis 9.2, and we are looking at moving forward with other software, and we have been testing QGIS recently. Basically we are trying to copy the existing projects we have, and ...
0
votes
1answer
197 views

Probably base64 encoded WKB - Reading in QGis/ArcGIS?

I have a probably base64 encoded WKB string. How would I load that feature represented by the string into QGis or ArcGIS? I found the QGis QuickWKT plugin, but that does not handle my base64 encoded ...
3
votes
1answer
278 views

QGIS display does not reflect projection

I have slight experience with ArcGIS, but am new to QGIS. I'm trying to set the projection of my map, and I understand that this is done by altering the CRS (coordinate reference system) of each ...
4
votes
1answer
99 views

Area calculation of an object without coordinates

I have a photo of an object with a scale and I want to calculate its area. I guess I have to create a polygon of the area to be calculated to use the 'field calculator'. But how do I tell the program ...
2
votes
1answer
368 views

Moving a shapefile point to specific coordinates

In QGIS is there a simple way to move a shapefile point in a shapefile point file to specific coordinates? Without exporting the points to WKT changing the x,y values and then importing the WKT via ...
2
votes
1answer
1k views

How to call processing toolbox in Qgis' python console

I have been trying to use processing toolbox via python console in Qgis 2.0.1. I am able to write the following comamnds: I am particularly interested to run 'r.statistics' from GRASS module. ...
1
vote
1answer
92 views

What is the use of Automatic overview support in Qgis 2.0?

Automatic overview support in map frame is one one of the new feature added in QGIS 2.0. In QGIS 2.0 Documentation explanation about this is given as Automatic overview support in map frame: "Need ...
2
votes
1answer
935 views

How to resolve “premature end of script headers” error with QGIS Server? [duplicate]

I attempted installing QGIS Server following these instructions. Installation was successful with no errors reported. However, when I try to use GetCapabilities I am getting this error: Internal ...
0
votes
1answer
255 views

Pull pixmap image source from ui edit text in QT

I'm putting together a custom form for QGIS identify using Qt Designer. One attribute has a file name to the accompanying photo of the feature. I'd like to have the photo label in the form grab the ...
1
vote
0answers
70 views

When digitizing, polygons are inverted

I need to use QGIS to digitize my images. My images are scanning electron microscope (SEM) images of rocks. I am interested in analyzing the pore space in the images. Here is the steps I follow: I ...
3
votes
1answer
214 views

How to set and configure a value relation edittype in QGIS 2.0?

I am trying to set the edit type of a vector layer to use a value relation. The Python commands below are processed without errors or warnings, but the when I check the properties in QGIS, only the ...
4
votes
1answer
1k views

How do I add Garmin .img files to QGIS?

I downloaded 10 .img files from garmin.openstreetmap.nl which are supposed to contain the topo tiles for the area I would like to add in qgis. I've been unable to find any instructions on how to use ...
0
votes
0answers
23 views

Qgis doufur, query problem [duplicate]

i've a question about a query I need to query results that are multiple of 50 like 100,150,200,300 How can i perform the right query?
3
votes
1answer
470 views

NOAA Nautical Charts .bsb format

Is it possible to load a nautical chart from NOAA into QGIS that has the .bsb format? Didn't have much luck with mrSID format. using QGIS(dev) on ubuntu 13.04
2
votes
2answers
586 views

How to create callout/balloon labels in QGIS 2.0?

I'd like to use callout/balloon labels for a vector layer in my GIS using QGIS 2.0. The only way I can see to do this is to position an ordinary label where I want it and then draw an empty text ...