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

learn more… | top users | synonyms (1)

0
votes
0answers
3 views

Merge Raster Layer Specific Order in Graphic Modeler

I'm using the Graphic Modeler/Processing Modeler to automate a process. The last step in this process is Merging three different Raster Layers. I'm using the "Merge Raster Layers" from Saga 2.0.8. ...
0
votes
0answers
6 views

Plugin to develop composer attribute tables

I have no experience of plugin development, but I'm wondering if it would be possible to write a plugin that solved the issue of multi-line tables in print composer http://hub.qgis.org/issues/10273 I ...
1
vote
1answer
196 views

Adding MrSid to QGIS

I'm fairly new to QGIS and was hoping someone could help me load some MrSID photos into QGIS. I have read some posts and have installed the OSGEO4W Installer and selected the GDAL-MRSID Lib. I ...
0
votes
0answers
18 views

Join/convert points to polygons [on hold]

(I am using QGIS 2.6 Brighton) I have 2 shps, one points and another one polygons. I need to make them one. Is there a way to join them or convert the points to polygons? Vonoroi doesnt work for me ...
0
votes
1answer
8 views

78% cease calculation and “no message” from QGIS

I'm a total noob. I'm trying to generate an outline of a bunch of elevation lines which i can use to cut into some other elevation lines. I understand that I can buffer and dissolve to get the result ...
1
vote
0answers
27 views

Frontal Detection of sst & Chlorophyll image

I am working on sea surface temperature satellite images and looking for delineating gradients in open source on the basis of temperature. Is there any tool like Cayula and Cornillon front detection ...
1
vote
1answer
12 views

Azimuthal orthographic projection QGIS2.6

I'm trying to create a globe view in QGIS2.6 with an Azimuthal Orthographic projection using NaturalEarth's 110m countries dataset. I'm following Hamish Campbell's blog post instructions that have ...
1
vote
1answer
125 views

QGIS Print Composer with ESPG:32615 [on hold]

I have imported a PostGIS layer as the only object into my project and set the project and layer CRS to EPSG:32615 (UTM Zone 15N). My layer appears just fine in the work area. When I try to create a ...
0
votes
1answer
16 views

PostGIS cannot create new feature

I have a PostGIS database - using the main user I can create/update new features no worries. I have created a series of new logins and given them all full access to select/insert/update etc all the ...
0
votes
0answers
14 views

Print large land area using QGIS 2.6.1 Brighton

I have a rectangular area of approximately 10km x 20km and I wish to print this to A0. (I will select a scaled portion of this area - most of it - that matches the A0 page size) I have a few layers ...
2
votes
2answers
74 views

Zebra grid is not displayed in map composer

in Qgis 2.6, in Map composer, while selecting grid frame style as Zebra, it does not works. Also while drawing coordinates points as exterior in map convas, it is not displayed. Actually I am facing ...
2
votes
1answer
37 views

How to align QGIS legend items to the right?

Is there a way to align QGIS map composer legend items to the right, for right-to-left languages? There is only a title alignment option. Furthermore, I found this ticket from 4 years ago regarding ...
3
votes
1answer
60 views

Reprojecting between NAD27 and WGS 84 part III

I am trying to perform a reprojection for data with datum Nad27 to WGS84 datum. According to AndreJ in some previous questions in Stackexchange (CRS reprojection for instance) QGIS uses internally by ...
1
vote
1answer
123 views

autocad-map of real estates with own coordinate system and information to be converted to use it in QGIS

I have a question regarding CAD and QGIS, but unfortunately I don't have a clue of CAD. Here it goes: Real estates data has been mapped. There are several reference points surrounding the area. So ...
1
vote
0answers
15 views

Shifted tiles in QGIS with mbtiles

I'm confused because of the representation of mbtiles files in QGIS. It seems that the whole grid is shifted by about 3 m to the south. So far I can observe this behavior only in the context of ...
3
votes
2answers
634 views

How to debug 'Layer is not valid error' from Python plugin?

I'm trying to understand what goes wrong with a QGIS python plugin. Basically I'm trying to render a series of POINT. The query works fine, at least giving it by hand from inside PostGIS DB: "SELECT ...
4
votes
1answer
117 views

ArcGIS and QGIS compatibility: issues with Shapefiles or Geodatabases?

I work at a small planning commission as 1 of 2 GIS people, where we have 2 ArcGIS licenses. A volunteer recently starting working with us. He is using QGIS and mostly editing shapefiles. I ...
1
vote
0answers
20 views

How to create a mosaic in QGIS with cutline and feathering for Landsat-8 imagery

1 - I have two scenes Landsat-8 RGB 6/5/4 and I need to mosaic them: 2- This is my cutline in polygon format that will smooth the overlapping area: 3 - So, I need to create a mosaic with ...
2
votes
1answer
26 views

How to compute areas where the value in one layer is smaller than in another layer?

I have two vector layers, one contains actual values (in this case % cover of native species), the other contains target vales of the same attribute. the polygons are not always of the same geometry. ...
1
vote
1answer
145 views

How to set field values as labels in QGIS2 Print Composer

I am mapping the distribution of 325 bird species, displaying circles in the grid cells each species occurs in. The data contains as many duplicates of the NAME as there are cells in which it occurs. ...
0
votes
2answers
90 views

Where to find the “contours from points” model in QGIS 2.6?

I can't find the example model "contours from points" in QGIS 2.6. Is there another tool for creating contours from points, besides the QGIS Contour plugin?
17
votes
4answers
2k views
+100

How to generalize a polygon file and maintain topology in QGIS?

I have a polygon Shapefile, which I need to generalize. How can I generalize the poligons and ensure that there are no topological errors like "slivers". I already tried: Vector -> Geometry Tools ...
3
votes
0answers
53 views

How to simplify polygon shapefile and maintain topology? [duplicate]

I'm looking for a straightforward answer that actually works...not a 'duplicate question' flag. None of the other solutions posted in similar threads actually work...they all have dead-end answers ...
0
votes
0answers
34 views

How to zoom past 1:1433 with Openlayers plugin in QGIS 2.6?

I am editing the polygon shape file in QGIS 2.6 with the projection of "USA_Contiguous_Equidistant_Conic" but i can't able to zoom in the open layers like Google maps and bing maps morethan 1:1433 ...
0
votes
0answers
27 views

Mapfile generation from QGIS project

I am looking for a way to transform a QGIS project (.qgs) to a MapServer Mapfile (.map). I am using Quantum GIS 2.6 and MapServer 6. The layers are postgis tables. I would need something like this ...
1
vote
1answer
44 views

How to develop c++ standalone QGIS C++ Application

I want to integrate QGIS in QT\C++ application. I try to write basic C++ apllication to render map and build it using MSVC 2010. class PostGisViewer: public QMainWindow { public: PostGisViewer(): ...
1
vote
1answer
52 views

How to move a layer in QGIS Toc above an existing group?

If in QGIS TOC a group already exists and I add a new layer via QgsVectorLayer* lyr= mQGisIface->addVectorLayer(uri->uri(),Title, myProviderName); the new layer will be inserted within the ...
1
vote
1answer
132 views

QGIS how to compute a trendline of two point lines? [on hold]

Does anyone know how to compute a trendline for two lines of points? I have two lines of points of a 10 km long urban road. 1st line is one driving direction and the 2nd line of points ist the other ...
3
votes
2answers
104 views

How to Make an Outside Buffer in QGIS?

I have a layer of street segments that are within a given distance of a fire station. Now I want to make a border around these street segments. If I use Buffer, it puts a buffer around each segment. ...
2
votes
2answers
58 views

How do I select a point imported from a GPX file?

I imported several GPX files and added a raster basemap for reference. The GPX files contains tracks so the points are sequentially numbered. I'd like to identify one of the points so I edit the GPX ...
2
votes
2answers
69 views

How can I transfer waypoints and tracks from Base Camp into QGIS2.6?

I'm working on transferring all my field data from Garmin Base Camp onto QGIS. This is an attempt to overcome the learning curve from basic trail GPS mapping programs to the real thing. I'd like to ...
0
votes
0answers
24 views

QspatiaLite Snapping fails if multiple target vertices within tolerance distance

I assumed that SpatiaLite's Snapping would snap to the nearest candidate vertex - however, it turned out that the result becomes unpredictable, if there are several target vertices within tolerance ...
0
votes
0answers
19 views

Field Calculator stopped working

The field calculator seems to have stopped working for one of my attribute tables (it works fine on others). No matter what I get it to express (I've tried simply 2*2, just as a test) it just produces ...
3
votes
1answer
266 views

Clip in QGIS 2.4.0 resulting in empty output files

I'm seeing the same problem to Clip or Intersection tool - QGIS giving empty files trying to use the Clip tool since upgrading to QGIS 2.4.0, but have not been able to fix the problem based on the ...
4
votes
1answer
122 views

four color theorem for QGIS 2.0 or Leaflet?

I recently looked at some other posts relating to this topic but as far as I can tell there is currently not a working plugin or script for QGIS 2.0 to achieve a four color theorem for styling polygon ...
0
votes
0answers
22 views

How to Create a Minimum Bounding Polygon in QGIS [duplicate]

Does anybody know how to create a "minimum bounding polygon" from a set of polygons in QGIS or elsewhere? For example, in the figure below I can create a Convex Hull per the purple outline, but I'm ...
3
votes
3answers
101 views

Plotting Geo Points with “by arc centered at” Instructions

A recent Supreme Court decision redefined the legal boundaries of California along the Pacific Ocean: http://www.theverge.com/tldr/2014/12/15/7397085/supreme-court-california-boundaries-map I am ...
1
vote
0answers
9 views

Print Composer: Finder window disappearing when pressing save button?

I recently updated to 2.6.1 (using mac OS 10.10.1). When I'm in print composer, and I try to save my map (or open a new file, or do anything that brings up a finder window), the window disappears ...
1
vote
1answer
30 views

How to customize the QGIS default GUI using Python?

Is it possible to hide/remove/customize the default ui of qgis using python plugin. I want to add my own menus and toolbars and remove default. If it's possible, which reference should I use?
1
vote
0answers
16 views

Is it possible to only have one Feature Attribute Window open in QGIS?

I suppose it's by design that when you click through(identify) your features, for every feature it opens the attribute window (which is good, i have enabled the checkbox to automatically open the ...
1
vote
0answers
26 views

Snapping while measure in QGIS?

I've been reading here and there that snapping while measuring should work in QGIS, but i can not make it work for the life of me. https://hub.qgis.org/issues/8537 All the snapping options are set ...
7
votes
0answers
51 views

Automated detection of tracks

Given an area with depressions in open area from; say all terrain vehicles driving on soft surface. The vehicles will cause parallel depressions (paths) of about 10-20 centimeters in depth and around ...
5
votes
1answer
364 views

QGis Zonal Statistics Plugin NoData included in Calculations

I have been trying to use the QGIS zonal statistics plugin. My raster has a nodata value of -99999 and all other values are positive. After computing the mean zonal statistics there are a number of ...
2
votes
1answer
196 views

Cause of ImportError: No module named mapscript in QGIS mapserver export?

I'm trying to expor project to mapfile in new QGIS Chugiak but a get this error below, someone have the same error? How can I fix this?thnks. An error has occured while executing Python code: ...
2
votes
3answers
127 views

In QGIS is there a keyboard shortcut to open/close the layers panel?

Simple question really - as titled. Is there a keyboard shortcut, or even something like a toolbar button, which would make it easier and quicker to open (and close) the layers panel in QGIS (2.6). ...
8
votes
2answers
117 views

Calculating all distances from single points to multiple polygons

I have two layers: a point layer defining properties (95 objects), and a polygon layer defining plots of land associated with the properties (211 objects). Each point relates to one or more polygons. ...
2
votes
0answers
14 views

Information On Supported Device Qgis Galaxy Tab 4 10.1 4G LTE

I need a tablet for outdoor work and i would know if this device "Samsung Galaxy Tab 4 10.1 4G LTE" works fine with qGis mobile application.
2
votes
2answers
104 views

Get Index for a group QGIS Python

I am trying to add new layers into a specific group which I can get to work if I know the index but how can I get python to fid the index of a group so it can load the new layer into the group ...
3
votes
1answer
940 views

legend groups and layer position/order qgis 1.8

I'm tring to programmatically create layer sequence also using groups. Simple python code: layer = QgsVectorLayer("004cp000.shp", "004cp000", "ogr") QgsMapLayerRegistry.instance().addMapLayer(layer) ...
3
votes
1answer
140 views

Programmatically change layer position in the table of contents (QGIS)

I am trying move/position a layer to the bottom of the TOC by using addTopLevelItem on all other layers. I unsure how to reference the layers as QTreeWidgetItem's. def bg_bottom_level_item(self): ...