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

learn more… | top users | synonyms (1)

2
votes
0answers
343 views

QGIS, “Handle bad layers” and empty layers

I'm a novice in GIS, so forgive me all possible mistakes I might have here... I'm using QGIS 2.0.1. (Dufour) with Mac OS X (10.6.8). I have couple of dozens(?) of vector layers added on a project. ...
2
votes
0answers
317 views

QGIS 2.0.1 connecting to ESRI WMTS jpeg vs jpg

I'm currently trying to troubleshoot an issue I have connecting to ESRI WMTS services. Esri ArcGIS Server seems to provide the format as JPEG via the rest service, but in the get capabilites ...
2
votes
0answers
95 views

Is there a way to build topology and work with topology relations in PyQGIS?

Is there a way to build topology and work with topology relations in PyQGIS? I'm asking because I need to run some custom generalization algorithms on my data, and I need to preserve topology. ...
2
votes
0answers
560 views

Google Maps Engine Connector error

I have recently installed the Google Maps Engine Plugin for QGIS 2.0 and it doesn't seem to work. Whenever I click on the Log in button it pops up with: Google Error:invalid_client Bad request. ...
2
votes
1answer
96 views

Find GPS midpoint and SD of GPS coordinate along a certain heading in QGIS

I have a set of GPS coordinates (x, y) along with heading information. The heading for these coordinates is more or less the same and the coordinates are within a few meters of each other. How can I ...
2
votes
0answers
190 views

Can QGIS display projected coordinate system for map, at same time as lat/long graticule and scalebar in km? [closed]

I am aware of this question, which was posted a year ago, but its accepted answer appears to be a workaround rather than a solution to the issue which is the subject of this Question. I wish to ...
2
votes
1answer
103 views

How to select vector features with partial (>33%) overlap with another vector feature?

I have a grid and a range map, and would like to select those grid squares which overlap at least 33% with the range map. The range map is a single vector feature. (I'm new to QGIS but have some Arc ...
2
votes
1answer
104 views

Is there no editmode for CSV files? [duplicate]

I load a delimited text layer and it get's visuialized. Unfortunatly I don't know why I can't switch to edit mode. I already worked with similar .CSV files in edit mode before, under the same setup :( ...
2
votes
0answers
137 views

How can I improve the resolution of a vector grid made in north pole stereographic projection?

I've been struggling with this for a while and wondered if someone could lend a hand. I have a map which already has sampling points from centroids in a 35x35km grid that was created in north pole ...
2
votes
1answer
27 views

Selecting Polygon Features in QGIS Lisboa

I want to select and save as a separate shape file, a smaller section (polygon) from a whole island country which includes both land and shallow habitat coastal features (like coral reefs) and when I ...
2
votes
0answers
43 views

Stop QGIS opening in a new workspace in Ubuntu

Very basic issue I imagine other Ubuntu users will have encountered: every time you open QGIS, it does so in a new workspace - note the arrow in the sidebar is empty not full, just after opening QGIS. ...
2
votes
0answers
3k views

QGIS 2: How to create a regular vector grid at fine scale and for large area?

In QGIS, we wish to create a regular vector grid with 25*25m resolution and over an area of around 12000 km2. We tried to use: -vector>research tools> vector grid - and v.mkgrid function from GRASS ...
2
votes
0answers
238 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. ...
2
votes
1answer
1k 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 ...
2
votes
0answers
244 views

How can I create random concave polygons for test purposes?

In the context of generating random test data using QGIS (in a shapefile): I can generate random, continuous (adjacent) polygons by first creating n random points using ftools and then generating a ...
2
votes
0answers
105 views

How easily can you pick up ArcGIS for Desktop if currently learning through QGIS on a Mac? [closed]

I'm currently trying to teach myself GIS and I have some really basic questions. I apologize if this has already been asked, but I have yet to find an answer to my question. So since I use a mac and ...
2
votes
2answers
434 views

Cropping and transforming geoPDF with GDALwarp

I got some great advice on how to transform a geoPDF to a geoTIF on this post, which used the available downloads from this site. I would like to take it a little further and not only convert, but ...
2
votes
0answers
320 views

How to use QGIS Accuracy Assessment plugin? [closed]

I am new user and i want perform accuracy assessment in qgis. I have 1 classified map and another for validation. I have installed the plugin. what am i doing after? Plugin: ...
2
votes
1answer
238 views

QGIS 1.8 Vector layer from ODBC connection [duplicate]

I have successfully set up an ODBC link from a FileMaker DB to QGIS, and using Layer/Add Vector Layer I can get a layer with a fully populated attribute table listed in the Layers Panel. I now want ...
2
votes
0answers
85 views

QGIS crashes when trying to open ecw files

I added Ubuntugis unstable repo and installed Qgis, libgdal-ecw-src, libecwj2-3.3 but still does not work. When I attempt to open an ecw file with Qgis it crashes and tells me: 'std::length_error': ...
2
votes
0answers
420 views

QGIS 2.0: Automating tasks, text files and shapefiles

Wondering if it's possible to automate some repetitive tasks in QGIS (2.0). This is my general workflow for importing some xyz type text files from another software package which export (not overly ...
2
votes
0answers
517 views

How to resize a polygon (rectangle or circle) in Qgis?

Yes I used the Rectangles Ovals plugin to create a rectangle then rotate it and move it nto position. But if you want to resize it that is where the fun starts because it is just a polygon with four ...
2
votes
0answers
90 views

How to sort legend values efficiently in QGIS print composer?

Using QGIS 2.0, I have a vertical color legend for raster values, created in the print composer. I want the values sorted in descending order from top to bottom, which appears to be the reverse of the ...
2
votes
0answers
124 views

How to copy the contents of an attribute from one vector layer to another one that touches it or intersects it?

I have 2 layers that intersect, called layer A and layer B. Layer A has an attribute (X) that I want to copy wholesale (for the whole layer) to layer B, so that when object A1 intersects object B1, ...
2
votes
1answer
157 views

heat map of density ratio of 2 layers of points

I have 2 vector layers of points: one with a point for each house in the city (thanks to osm.org), roughly equivalent to population one with a point for each case of cholera in the city I'm trying ...
2
votes
1answer
47 views

Where did XYTools go [duplicate]

Where can I find the repository for XYTools plugin? I have tried several repositories and got messages that it was permanently removed!
2
votes
0answers
197 views

Our best table-analysis with GIS? [closed]

Sometimes I think about possible analysis using GIS models (I use QGIS 1.8), and I always think about few types of visualization techniques: demographics, traffic flows, distance ones... Thanks to ...
2
votes
0answers
672 views

QGIS connecting to ArcGIS world imagery - not loading correctly

Have connected QGIS to ArcGIS World Imagery using python console as described on http://www.northrivergeographic.com/qgis-adding-an-arcgis-rest-service. QGIS Seems to connect and make a raster layer ...
2
votes
0answers
41 views

How to search for layers in the layers panel?

I have QGIS projects with a lot of layers. Sometime it's difficult to find a layer into Layers Panel. How to search it?
2
votes
0answers
69 views

How do you compute vertical transformations in QGIS?

How do you compute vertical transformations in QGIS? Ideally, the procedure / plugin will allow the loading of sundry geoid models.
2
votes
0answers
233 views

How to Install GRASS Addons to use in QGIS [duplicate]

WIN 7 QGIS 1.8.0 GRASS 6.3.4 I want to use r.viewshed in QGIS. therefore i want to install it in GRASS by using the GRASS interface. Followin Error appears. g.extension.py extension=r.viewshed ...
2
votes
0answers
97 views

Can Esri ASCII Input files be Aligned with Track Heading in QGIS?

Using QGIS to input Esri ASCII data files, I uploaded many small files, each file representing a second of data: 16 sensors X 25 lines. Each file uploaded creates a small rectangle on my larger map ...
2
votes
0answers
63 views

Error importing NOAA’s National Geophysical Data Center as delimited text layer in QGIS version 1.02

I've been struggling with trying to import the most recent data from NOAA’s National Geophysical Data Center earthquake information into Quantum GIS 1.02 for weeks now for a class assignment. I'm ...
2
votes
0answers
511 views

How to specify cost attributes for network analysis in QGIS using the GRASS plugin?

I have a road dataset with information about the length, speed and drivetime for each segment. I use QGIS 1.9 with the GRASS plugin to do different types of network analysis, but how do I set up the ...
2
votes
0answers
153 views

Convert pixel value histogram to table

I am working in QGIS 2.1 with the National Land Cover Database 2006 land cover layer. It is a raster layer with pixel values corresponding to different land cover types. I have clipped this raster to ...
2
votes
0answers
123 views

Displaying DEM raster in QGIS

Using Raster>Analysis>DEM to display hillshade produces the message "gdaldem.exe had stopped working" so I asked the community. I'm new to QGIS, and I now realise after a little experimentation that I ...
2
votes
0answers
20 views

Problem with postgres/quantum converting long/lat to suitable projection/SRID [duplicate]

I'm sure it's a simple question but this is all very new to me and after a lot of internet searching my points are still in the sea! I have a set of UK postcode data that I have converted into ...
2
votes
1answer
399 views

KML to shape QGIS conversion [duplicate]

I am trying to import a KML file to QGIS. The KML source file is about 15mb is comprised of polygons with attribute data. The KML imports fine and polygons display but the attribute data is unreadable ...
2
votes
1answer
372 views

Sextante in Qgis 1.9 alpha on Ubuntu can't find saga gis 2.1

I am using Qgis 1.9 on Ubuntu 13.04, Sextante is a core part of qgis now. I am trying to access the SAGA 2.1 libraries through qgis and I keep getting a popup window that says SAGA is not installed. I ...
2
votes
0answers
19 views

Sum vector data correlating with a second vector layer [duplicate]

There are a lot of questions very similar to mine, but I couldn't find one that accurately described what I want to do. I am working in QGIS. I have one vector layer which, among other attributes, ...
2
votes
0answers
68 views

Loading a layer into the same position as an existing layer in QGIS

I understand that it is not possible to directly reload a shapefile layer in QGIS using the reload method in Python, since this method is not implemented for shapefile data providers. Thus, the ...
2
votes
0answers
262 views

How to render a transparent raster layer on top of one or more vector layers with PyQgis?

I been trying to render a map with a 3 vector layers and one raster layer. The idea is that the raster layer should be on top of the other 3 vector layers. The problem is that even when I add the ...
2
votes
0answers
165 views

Spatial Precision for Editing in Multiple GIS Clients

I have something I'd like to discuss, I'll try to explain it first, why it's important, and I'll explain how ArcGIS handles the issue, which I think is a good way to handle it. Finally I'd like to ...
2
votes
0answers
366 views

Plotting X, Y coordinates generated from MySQL database in QGIS

Currently running QGIS 1.8.0 on Mac OS X 10.8.4. I can plot points on a map using the "Add delimited text layer" plugin to get x-y coordinates from a text file. However, I'd like to be able to ...
2
votes
0answers
257 views

Umlaute not displayed correctly when loading .mdb MS Access into QGIS (1.9.0-Master) with eVis

Good evening, I am loading an .mdb (MS Access 97 or 2003) to QGIS (1.9) via the eVis database conection. Connecting to the mdb, selecting a table and displaying it as a point-layer through the ...
2
votes
0answers
120 views

QGIS - How to avoid -2147483648 value from imported CSV?

I am attempting to join a spreadsheet containing all the CIA Factbook Country Comparison Data (many columns) to the existing Natural Earth world countries shapefile. I followd the tutorial here, but ...
2
votes
0answers
128 views

How to fix ImportErrors when loading Python plugins in QGIS?

I have recently installed QGIS 1.8 in Windows 8. Although QGIS seems to be working fine, I cannot load plugins after their installation. Instead I keep getting this message: Traceback (most recent ...
2
votes
0answers
71 views

Moving legend items up and down in QGIS

How can I change sort order in layer properties styles tab? The only way I've found is to change their labels and order by it.
2
votes
1answer
2k views

How to fix “import qgis.core ImportError: DLL load failed” [duplicate]

I am trying to develop a GIS application in QGIS using the Python language. Unfortunately, I encountered a problem from the outset is that of import and qgis.core qgis.gui. the Problem in the python ...
2
votes
0answers
339 views

Styles from Geomedia (mdb with style library) to be used in qgis?

We are trying to move some projects from Geomedia Professional to QGIS. Since we have large style libraries (stored as mdb) we are looking for a way to convert the styles to a format that QGIS can ...