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

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3
votes
1answer
388 views

What causes OTB pansharpening ERROR Inputs do not occupy the same physical space?

When I try to use the OTB pansharpening tool an error comes up and I don not really know what the problem is. I have a RGB and a Band8 map (both from Landsat8) which I want to use for the tool. All ...
3
votes
0answers
163 views

Statistically comparing two sets of coordinates [closed]

I have been given a task to compare two sets of points, one set being a set of predetermined points, on the other being a set of actual points that were taken in the field. I have to compare these ...
4
votes
3answers
247 views

basic problem using division in field calculator

This is a very basic question, but I can't figure out what's going on. I've got election results I'd like to simply display as percentages rather than vote totals, which should be as simple as ...
2
votes
1answer
357 views

How to get the Parameters for a Lambert conformal conic projection CRS in QGIS 2.6

I am currently having some trouble adding the CRS to a vector file that I want to re project to WGS84/UTM. The shapefile is using Lambert Conformal Conic Projection; ITRF92 horizontal datum and GRS ...
1
vote
1answer
98 views

Adding geometry to QgsVectorLayer with lon/lat coordinates

I'm creating a custom Qt app that uses pyqgis for showing data on maps. I have successfully created a map canvas that shows a world map from a WMS server. Now I'd like to overlay data on this map. ...
2
votes
1answer
84 views

Qgis how to combine a geotif with a country border shape file?

I have 2 files. A geotif with different values and 1 shape file with country borders of this area. Can I generate with this 2 files an image with the country borders and the data from the geotif? ...
5
votes
1answer
354 views

Black edges on overlapped raster images in QGIS

I'm beginner with QGIS and I have task currently to make some GIS map/data. I downloaded 3 satellite images from Landsat by USGS (multispectral, georeferenced) and I did overlapping of images using ...
2
votes
0answers
119 views

how to extend polyline to the intersection point?

I have a polyline shape file, would like to extend the polyline to the intersection point of the nearby polyline and snap using python in Qgis. Thanks
1
vote
1answer
166 views

QGIS 2.4 print composer map extent does not sync with main window

I'm using QGIS 2.4 and got some issues with the print composer. First thing is that the "update preview" button reloads the map, but does not change the view when I move to another place in the main ...
2
votes
1answer
160 views

How to auto-generate multiple maps with different features in QGIS?

Anyone can explain me how can i auto-generate multiple maps with different variablies using Atlas tool in QGIS? So i have only 1 layer which consists of 10+ features, and i want select some of that ...
3
votes
2answers
799 views

”No module named ogr” when installing QGIS plugins

In QGIS 2.6.1, when I try to install the FlowMapper and QGIS Cloud plugins, I get an error - "The plugin is broken. Python said: no module named ogr" - giving me the only option of removing them. ...
3
votes
2answers
242 views

How to output coordinates from a shapefile to a GMT or CSV file in QGIS?

I want to get the coordinates for a line shapefile as csv or gmt files. I click create "new layer" - "new shapefile layer" - I check the "line" box and then "OK". Then I make my shapefile. When I ...
2
votes
0answers
33 views

How to select points as geomtry in QGIS when both multipolygons and points are stated within the wfs-server?

I'm trying to show data from the following server in QGIS: h ttp://geodata.nationaalgeoregister.nl/bag/wfs? I made a filter on the data I would like to appear in my map. This is how I stated the ...
2
votes
0answers
121 views

QGIS polygonize GDAL DLL load failed

I'm using QGIS 2.6.1 and i've been having problems using the polygonize function. I keep getting a "DLL load failed" import error. I've searched older threads which unfortunately weren't able to ...
3
votes
1answer
66 views

display only one point for each ID

I'm working with a point layer (many many features) that has some attributes, like the elevation of each point. I created a polygon grid (5 km x 5 km each cell) with an unique ID and I made an ...
3
votes
1answer
168 views

Getting random values from geometryType() in a standalone PyQGIS script

I am asking this question based on the result I received from this earlier post. The following script only works if I set geometryType() == 3 as that is what is being printed out in the Python console ...
1
vote
0answers
28 views

QGIS rasterize a styled layer

I disabled information from a vector layer with a styledefinition. Is it possible to rasterize only the styled information in QGIS?
1
vote
0answers
309 views

MMQGIS Plugin not working with QGIS 2.6.1? (Resolved) [closed]

QGIS 2.6.1 on Windows Have done a bit of research on this and I think it may be caused by the recent update in version to QGIS 2.6 (it worked in 2.4). I am trying to perform an attribute join from csv ...
4
votes
1answer
284 views

Has anyone used QGIS as an alternative to Terrasync or ArcGIS mobile?

We are planning to purchase a rugged field computer (Trimble, Juniper, Ashtec etc.) for accurately surveying habitats and work sites in remote locations. In the past we have found that the software ...
3
votes
3answers
2k views

Problem operating LAStools in QGIS 2.6.1

I have a problem with LAStools in QGIS 2.6.1. I have never used QGIS to process LiDAR data before. I downloaded LAStools yesterday from the rapidlasso GmbH website. I unzipped the “lastools.zip” ...
5
votes
2answers
450 views

How to split lines with PostGIS and view the result in QGIS?

I have two tables, one contains lines (test_line) and the other contains the points at the vertices of the lines (test_line_vertex). I want to split the line into individual segments based on the ...
0
votes
0answers
47 views

Upload SHP to PostgreSQL via QGIS

There was the error when I try to upload the SHP to the PostGRESQL. The feature is the line type. The error was: ERROR: Geometry type (LineString) does not match column type (MultiLineString) Do ...
2
votes
1answer
182 views

QGIS - Save not working after copy-paste between layers

I am trying to copy points from one layer to another in QGIS, both shapefiles, both with the same schema, both point files, both with the same Coordinate Reference System. The shapefile was originally ...
2
votes
1answer
85 views

QGIS Print Composer - Display Symbols for Empty Classes?

I am working on a map of mortality rates for several racial/ethnic groups and I have created custom classes to encompass the rates instead of the QGIS classes created through its various modes. This ...
4
votes
3answers
694 views

GeoTIFF world file ignored by QGIS?

I am having trouble getting geotiff rasters to get correctly placed even with a world file available. I have tracked down some discussion from 2010 that suggests that if the geotiff already has the ...
1
vote
2answers
54 views

Display only the features containing a name

I used QGis to open a shapefile with the rivers in my state (Rio Grande do Sul, Brazil). I would like to know "the name of every river", but when I click on the rivers, most of the small ones don't ...
3
votes
3answers
444 views

Update point shapefile attributes from polygon shapefile using QGIS

I have two shapefiles: one point and one polygon. The point shapefile have five attributes that describe the points. The polygon shapefile have one attribute: name of the polygon. I am a beginner to ...
0
votes
0answers
122 views

Cannot see line made with PostGIS ST_MakeLine() in QGIS

I am probably missing something obvious while trying to do this basic job. thetable contains gps track points. The following aims join the track points by a line: CREATE VIEW line01 AS ( SELECT ...
1
vote
1answer
63 views

Extracting point for polygons from shape file - not working

I am trying to extract the lat long points for the polygons from a shape file. I have followed the directions from the following links: Get list of coordinates for points in a layer? How to extract ...
2
votes
0answers
38 views

QGIS Python install question

Apologies for the 101 question; however, in trying to ramp up on python/QGIS I've seen mentioned that python.exe is the key executable in a python install. I have both Python 2.6 and 2.7 installed on ...
2
votes
0answers
92 views

Using pdb in QGIS console

I am unable to use pdb from qgis console. If I run a function that calls pdb.set_trace() I get the error Traceback (most recent call last): File "<input>", line 1, in <module> File ...
0
votes
0answers
89 views

Is it possible to “re-buffer” river polygon dataset? [duplicate]

I've river polygon data representing the water quality. This polygon data were derived from polyline dataset according to a buffer distance in the attribute table. Unfortunately I don't have this line ...
2
votes
0answers
96 views

QGIS Dimensioning during edit

Is there a plugin or tool providing following functionality: I select 2 points (or vertices) - it shows the length between this points When i edit the point (or move vertex) the length automatically ...
2
votes
1answer
643 views

Orfeo tool box (OTB) in Ubuntu 14.04 and SAGA incompatibility (gdal versions)

I need to test segmentation of a 12000 x 12000 pixels scene. I successfully compiled OTB in Ubuntu 14.04 and ran the process. But when I tried to start SAGA, I got a startup error. I found that gdal ...
0
votes
0answers
52 views

Is there a tool that is similar to the ArcGIS repair geometry tool in QGIS? [duplicate]

I need a tool in QGIS that has the same functionality as the repair geometry tool (native of ArcGIS).
2
votes
1answer
484 views

ImportError: No module named processing [duplicate]

this question may have been discussed before but i was not able to find any answer. I am developing a stand alone python script that will invoke methods from processing module. I am seeing error ...
2
votes
0answers
106 views

Cartographic-complete Maps in PDF On Request using Open Source?

Currently I have some data in PostGIS. I want to implement the following: users will make a request via web, with parameters like location, scale, layers to be displayed, etc. and I need to provide ...
2
votes
1answer
78 views

align scale bar with PyQGIS

I am making several maps from a template with a PyQGIS script and I am having problems to align the scale bar on them. My code is: # create scale bar item = QgsComposerScaleBar(comp) ...
4
votes
1answer
94 views

Save project with layers as one compiled file [duplicate]

this may be a rookie question: Is there a way to save a QGIS project as one large file that includes the layers it points to? I am working with Tecplot quite a bit, which has the option of referencing ...
5
votes
2answers
533 views

How to identify polygon/point shapefiles in python?

I have a script which performs various functions on shapefiles, most of which are polygon-based. However, some shapefiles are point-based and I have to specify where these files are by editing the ...
2
votes
2answers
100 views

QGIS - Edit UI - Python Init function localization with QTranslator

I have interaction with layer defined by custom designed UIs. In layer properties the following settings: Edit UI - customline.ui and Python Init function: customline_set.py. #coding: utf8 from ...
1
vote
0answers
133 views

Error running polygonize from QGIS!

I'm trying to vectorize a raster image and when I'm running polygonize within QGIS 2.6.1. I'm getting the following message: Traceback (most recent call last): File ...
0
votes
1answer
141 views

is possible creating Geowebcache tiles offline

When I start geowebcache seed mechanism, my server CPU is working %120 persentage. And I can not use WMS service on my openlayers application because it is working very slow. Server sources are ...
2
votes
1answer
121 views

How to make label show up on contour vector in QGIS? [closed]

I'm new to QGIS (version 2.6.0). I think my question should be easy to solve but I still get stuck at making labels show up on contour lines. These lines were generated from extracting raster (asc ...
2
votes
0answers
23 views

dxf to shp conversion areas mismatch

I have added a dxf file in QGIS and saved it as shp file. the problem it that the area of the the polygon in shp. file is 1% more than the area of polygon in dxf. just to double check i have exported ...
1
vote
1answer
45 views

QGIS search works, layer save does not?

Im using QGIS 2.6.1 Brighton on an IMac with OSX 10.8.5. QGIS 1.8 worked on the same machine, as did QGIS 2.0. AFter installing 2.6.0 and then 2.6.1 I opened a file I'd used before and several queries ...
1
vote
1answer
201 views

buffering very short line segments with a flat end

I need to buffer a collection of line segments, with a flat shape (corners) at the line ends, as opposed to round. 99% of them work fine in ArcGIS, but some individual line segments are quite short ...
2
votes
2answers
1k views

Why can't I open .asc files in QGIS?

Further to my earlier question, I have .nc and .asc files of crop area and production for maize, rice and wheat. It says here, about QGIS importing .asc files: QGIS has native support for this ...
3
votes
0answers
1k views

How to install QGIS with ECW support on Mac?

I bought a imac recently and I tried to install qgis: without success! It is not possible to read the raster files. I installed GDAL ECW plugin, but it is necessary to copy and paste another file ...
4
votes
1answer
119 views

proj.4 definition for (obsolete) UK War Office “Italy South” grid

I'm helping a friend convert his late father's war diary coordinates to WGS84. I have a proj.4 definition that appears to work in QGIS, but if I transform a scanned map with gdalwarp, it's not even ...