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

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5
votes
1answer
433 views

How do I convert a QGIS 1.8 plugin to QGIS2.0?

I have developed a plugin under QGIS1.8 and now I want to make it work on QGIS2.0 I have chage qgisMinimumVersion into 2.0(originally 1.8) but QGIS2.0 still give me the error say This plugin is ...
1
vote
2answers
353 views

QGIS 1.8 will not load world file

My maps georeference just fine in QGIS and I save them to jpg with jpgw. The jpg image loads but the jpgw file does not. I keep getting the error message "this is an unsupported file", or words to ...
0
votes
1answer
58 views

Install plugins for qgis in centos

I followed the instructions here: How to install QGIS on Centos 6? If I run: QgsVectorLayer * vpoly = new QgsVectorLayer("Polygon", "pointbuffer", "memory"); QgsVectorDataProvider * provider = ...
1
vote
1answer
170 views

What causes QGIS 2 Plugin Manager Error from showPluginManagerWhenReady?

there. when i open the plugin manager in qgis, i get this: Ocurrió un error durante la ejecución del siguiente código: pyplugin_installer.instance().showPluginManagerWhenReady() A Google ...
3
votes
1answer
191 views

uDig Connects to PostGIS but not QGIS

I recently installed QGIS 2.0.1 and uDig 1.40b on the same computer. PostGIS (from OpenGEO Suite) is running on my server. I'm able to connect to PostGIS and access layers with uDig but not with QGIS. ...
1
vote
2answers
140 views

QGIS I would like to get a single point from a polygon Centroid if within the polygon any point if not

I am trying to generate label points from my polygons. The Polygon->Centroid works great except that if the centroid happens to land in a hole it is still returned. I need to get a single point ...
1
vote
0answers
167 views

Modifying Raster Layer with Python Console

Forgive me if this has been asked somewhere else. I am looking for a way to edit a raster file which has already been loaded into QGIS through the python console (i.e. I would like to edit the raster ...
4
votes
1answer
89 views

Update Grid cell value with Point attribute

I have a 4km gridded dataset with each grid cell value as a measurement of precipitation. I would like to update it with a point shapefile of more precise precipitation values. Aside from ...
1
vote
1answer
1k views

QGIS 2 Installation on MAC OSX - couldn't load plugin 'processing' [duplicate]

New installation of QGIS running on Macbook Pro OSX 10.8.4 - this comes up on startup. I urgently need this fixed!!! I have a project due in 10 days that I desperately need QGIS for. Thanks for the ...
1
vote
0answers
39 views

Cached Featured in WFS - can I change default

QGIS currently sets the default to cached download for adding WFS - is it possible anywhere to set the default to non cached mapping (I know you can untick the box, but its for a larger user group)?
1
vote
2answers
772 views

QGIS - Continuous buffer image [Heat Map]

Is it possible to have the representation like the one the heat-map like the figure below using QGIS? The way seems to use buffer options, but I do not know how. Does exist any plugin that helps? I am ...
3
votes
3answers
2k views

QGIS 2 Python error on Mac OSX

Have just installed newly released QGIS 2.0. I installed the gdal package available at the official kyngchaos site. It seems to run ok, but when the program loads up I get a lengthy error message ...
3
votes
1answer
1k views

QGIS 2.0.1 Runtime error and crash at Add Delimited Text Layer plugin

I just installed Dufour on my Windows 7 Lenovo ThinkCentre desktop. When I open 2.0.1 I get this error window: And when I try to add the 'Add Delimited Text Layer' plugin I get this message: ...
0
votes
0answers
141 views

Weather interpolations QGIS

does any one know how good are the weather interpolations that QGIS carries out? Do you have any other suggestions or better methods to do them? Please let me know. Thanks in advance!
3
votes
1answer
145 views

QGIS layer in .svg or with a better resolution?

I have a georeferenced layer, built from a nice map drawn with Inkscape. But when I convert it to *.png, *.jpg or *.tif, there is a pixelisation of the map. After georeferencing, it gives a pixelised ...
3
votes
1answer
246 views

Looking for help for automatically making a QGIS map

Im looking at making a standalone script, that on execution will run the QGis MapComposer using a previously generated template and output a PDF/PNG of the map. This process of making a map will be ...
0
votes
0answers
161 views

memory restrictions in QGIS Interpolate?

I am trying to make a DTM from contour lines (.SHP) using the Interpolate tool. The tool runs fine when I clip the data into smaller areas, but when running for larger areas, it crashes QGIS. Are ...
0
votes
0answers
405 views

How to create contours from points where points are not a grid?

With QGIS 2.01, the plugin Contour is not available. Anyone have another method to create contours from point / shapefile source, where the points are not a grid?
1
vote
1answer
551 views

QGIS Server does not display test WMS

I'm having a similar problem to this post: Using Qgis server with Ubuntu 12.04 I am using Mint 15 desktop and QGIS 2.0.1. I read the above post and decided to go back a step or two and followed this ...
3
votes
2answers
271 views

QGIS 2 problems with Plugins

Rough English (Translated by a user): When trying to access plugins I am told Unable to open the Python console. When I start qgis, the message also shows up but I don't know what it means. ...
0
votes
0answers
46 views

Polygon shading is darker in certain areas

When drawing in qgis i am encountering an error when drawing large polygons snapped to multiple points. Polygons that have this shading in certain areas are not displaying correctly in other ...
2
votes
1answer
142 views

Accented characters in csv file appear as '?' when importing to QGIS

The tabular data (.csv file) and the data in the attributes table of the vector (.shp file) I am trying to join includes accented characters - they are place names in Pamana. For example 'Río Abajo' ...
3
votes
1answer
305 views

D3 to match this QGIS projection?

I have a map of Finland in QGIS, which says CRS = ETRS89 / ETRS-TM35 (Authority ID = EPSG:3047). I'm trying to show the map with D3, and can't quite match the borders/projection. The black one is ...
1
vote
1answer
174 views

QgsRasterLayer::identify() is missing after QGis upgrade to 2.0.1

My Ubuntu has just downloaded the latest version of QGis (1.8 -> 2.01), and my plugin failed with a plenty of bugs due to implemented changes in QGis API. I still can not figure out how do I replace ...
1
vote
1answer
610 views

QGIS Real Time GPS

I'm trying to navigate real time with an USB GPS over a shapefile map, but I can't find the way to do this. I'm using QGIS 1.9.0 desktop version with a Garmin Etrex Legend HCx GPS. In fisrt place, ...
1
vote
0answers
82 views

Attribute table in Map Composer has no content QGIS 2.0 [duplicate]

I make a QGIS Plugin and I try to use the map composer to print a .pdf Map. In this Map I like to display the attribute table of a layer. I load it in with: vLayer = ...
5
votes
1answer
707 views
5
votes
1answer
983 views

Split polylines at polygon boundaries in QGIS

I have a set of contour lines and a polygon set containing glaciers. Because I want the glaciers to have blue contours, I need to split the contour lines at the glacier boundaries. I can achieve this ...
1
vote
0answers
23 views

Overview effect on postgis polygon table

Is There a Way, with postgis and qgis, to reproduce the overview effect of tiff Raster on a polygon table in order to increase speed? What if we could create simplified versions of this table,gathered ...
1
vote
1answer
263 views

saga 2.0.8 and gqis 2.0.1 on ubuntu 13.04

is it possible to have saga 2.0.8 and qgis 2.0.1 installed on ubuntu 13.0 4at the same time? I have the ubuntugis-repositoy activated and I got no problem with qgis and grass, but it seems impossible ...
3
votes
2answers
440 views

Access Sextante (processing) in standalone QGIS app?

Sextante is addressable via python using the QGIS python console (unfortunately not from outside QGIS). I´m writing a standalone app and want to include Sextante geoprocessing functionality. In QGIS ...
1
vote
1answer
412 views

QGIS: CSV point grid to polygon - not raster

I have a CSV file with various data in 1 degree wide by 0.5 degree high rectangles, for which I have the N,S,E,W, & centroid lat/longs, i.e. every bit of spatial data required. I'm trying to ...
4
votes
2answers
201 views

can Well Known Text tables be used effectively, stored in Access or Base?

My question is: How do I import WKT text data back into QGIS, and how useful could Base or Access be in storing the data using WKT rather than spatially enabling it within a proper GIS database, like ...
2
votes
1answer
105 views

How to do a raster reprojection in QGIS with custom map parameter

I'd need to reproject a raster dataset in a new customized projection, but I'm fairly new at both QGIS and GDAL and I'm not exactly sure about how to proceed and what the exact syntax is. The ...
2
votes
1answer
248 views

How to calculate mean coordinates from big point datasets?

I know there are several questions related to speed issues in QGIS, but I am having problems when running Ftools. I have a vector with ~70,000 points in it. When I run the generate mean coordinates ...
1
vote
2answers
2k views

Style file to QML or SLD

I have downloaded a dataset from a government organisation. it comes with a .style file. I use QGIS 1.8 on windows 7. Is there a way to use the .style file as a qml or sld? I have tried simply ...
0
votes
0answers
50 views

How to change coordinates of entire geometries in QGis

There is similar question but for ArcGIS. So how to do it in QGis? I have dataset from WWF which use different shoreline than GHHSG, in short all geometries need shifted down and left slightly.
1
vote
0answers
211 views

How to sample a raster using the Point Sampling Tool in QGIS 2.0? [closed]

I have been trying to sample raster using the Point Sampling Tool in QGIS 2.0. Though the new shape file is getting generated it does not have the values unfortunately. How do I take care of this? ...
0
votes
1answer
174 views

Problem in calculating length

I am Digitizing road line in India using open layer plugin.When I calculate the length of line using field calculator it gives me the result in millimeter . I thought it is the projection problem and ...
0
votes
0answers
148 views

How to edit the PGDB data in QGIS

I have a small query regarding the Q-GIS software. I hope someone in the know would be able to answer them. I am using 1.9.0-Master q gis. My datasets are inside a ESRI personal Geodatabase. I am ...
3
votes
3answers
1k views

OSGeo4W and QGIS 2.0

I just ran the OSGeo4W installer to update my previous installation and I noticed that it was updating my QGIS installation from 1.8 to 2.0. I haven't been able to find any information on the web ...
0
votes
2answers
195 views

Is it possible to intall the opengeostack and QGIS nightly?

Did someone managed to get the opengeostack running alongside qgis so the plugin suite-qgis-plugin can be used? I am trying it on ubuntu1304, installing opengeostack works ok, but then when installing ...
1
vote
2answers
111 views

Coordinates system in degrees in plugins for QGIS

After adding a vector layer of coordinates of settlements of a part of the world INTO QGIS 1.8, I wish to add a topographic or other nice looking, colored map. Trying plugins like maps from Google ...
1
vote
1answer
83 views

Problem opening Natural earth quick start for QGIS

Trying to open the file "Natural_Earth_quick_start_for_QGIS.qgs" a window opens, listing 20 "bad layers". The window is entitled "Handle bad layers". Consequently I cannot even get started with ...
7
votes
4answers
315 views

How to compare areas in scanned historical land use maps

I am a relative beginner to using GIS, and am running QGIS 2.0.1 in Linux. I have two historical maps which I want to analyze, that show land use patterns in the same area at two different moments in ...
7
votes
1answer
949 views

GRASS v.Overlay/QGIS Intersect Speed intersecting line and polygon

Im currently trying to convert my scripts from ArcGIS to QGIS but one aspect that is extremely slow (imo) is trying to intersect a polygon with a line feature. I feel as though there must be a better ...
4
votes
2answers
2k views

Dissolve polygons in QGIS (GEOS) with tolerance

I have a polygon vector layer representing the area inundated in a flood. The layer has been produced in a such a way that some of the areas are composed of multiple smaller touching polygons (see ...
1
vote
1answer
245 views

Save as Image geotiff from OpenLayers plugin [closed]

Now i'm working with the new version of Qgis 2.0 but I have a problem with the OpenLayers plugin. I take a geotiff screenshot of an area in EPSG:3857 and then I load the image.I'd check out the CRS of ...
0
votes
1answer
386 views

Shapfile created in QGIS does not fit in ecognition project

I have various shapefiles - some created by others, some created by my self. They should all have the same size of the underlying Raster file. The shapefiles have been created on top of a Raster file ...
1
vote
2answers
202 views

how to set width & height of a polygon in QGIS

I can't setting width and height of a polygon How to do that in QGIS? Thank you