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

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1answer
100 views

Gdalinfo and QuantumGIS does not recognize Spatial Reference even though Python does

I apply the following Spatial Reference to a file: spatialRef = osr.SpatialReference() spatialRef.ImportFromEPSG(3411) outraster.SetProjection(spatialRef.ExportToWkt() ) geotransform = ...
0
votes
1answer
106 views

Cannot display Oracle raster images using QGis

I am dealing with QGIS 2.2 and the plug-in Oracle spatial georaster. Apparently the connection to the database can be made, as the raster images are listed once you press 'Connect', but when try to ...
2
votes
1answer
224 views

QGIS 2.2 Raster Merge losing color data

I'm trying to merge a couple of GeoTiff maps using Raster > Miscellaneous > Merge but the merge is only coming out in grayscale. The geotifs are using palettes color. How do I get the merge to keep ...
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0answers
143 views

How can I edit spatial data automatically on postgis and check for topology errors on said data whitout using shapefiles?

So, I have spatial data stored in postgis (points, lines and polygons) and would like to edit and update those in an Open Source software (quantum GIS, grass, etc.) to check for topologic errors, ...
2
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2answers
2k views

Qgis - Couldn't load plugin 'processing' - name 'QsciLexerCustom' is not defined - Manjaro

UPDATED I receive the following error when I start Qgis: Couldn't load plugin 'processing' from ['/usr/share/qgis/python', '/home/v/.qgis2/python', '/home/v/.qgis2/python/plugins', ...
1
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1answer
187 views

Calculation amount or number of certain pixel-values in a raster

It seems pretty simple but until now I could not find a proper solution: In a given raster i want to know the number or ratio of e.g. red pixels. Edit: to be more precise: I have a number a arial ...
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0answers
54 views

how to mark certain distance alongside a coastline and saved as kml to import to google earth?

Hi all I would like to mark the region of 200 nautical miles away from the coastline, how can i do this? Thanks in advanced...i already try the buffering function on qgis but dont know how to create a ...
2
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2answers
1k views

How to download new version of QGIS 2.2?

Can anybody tell me how to Download Qgis 2.2 new release version? In QGIS website they mentioned in download window QGIS 2.0 . if u checked released data it was 24 feb 2014. So where i wll get QGIS ...
4
votes
1answer
770 views

Proportional Symbol Formatting

I need to create a proportional symbol map for a GIS class. I am wondering, how can I manually change the symbology to make the dots grow in size depending on their magnitude represented, and also how ...
5
votes
2answers
417 views

Creating contours for specific elevations

Input data: 1. an SRTM raster. 2. Point file of peaks. -Attributes contain ID, x, y, z and the elevation at which the peak is completely isolated from a neighboring peak. The output I want is a ...
2
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0answers
112 views

How to set posgis default sequential value in a QGIS “editable” view?

Introduction In a QGIS project I have a VIEW, that I want to became editable (I'm trying to replicate the versioning system used DB Manager with some tweeks). Therefore I created a few rules to ...
1
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2answers
136 views

QGIS and GDB issue with state published data

QGIS version 2.0.1-Dufour Good day.. I am new to this area and to QGIS, yet thus far I am enjoying the tool and its been very helpful to me. I'm working on a pet project and thus far I have been ...
2
votes
1answer
797 views

Showing unknown SRS (native SRS) when importing shapefile into GeoServer

I am facing a problem on an unknown SRS when I am importing a shapefile into GeoServer. I am trying to import a shapefile into GeoServer but when I am publishing the shapefile, it is giving the ...
0
votes
2answers
93 views

Print composer layout

I am new to QGIS and am using print composer. My questions are a) how to I change from vertical to horizontal orientation b) how do I zoom in on a map that I've added and 3) how do I stop a black box ...
0
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1answer
70 views

how to compile qgis-1.8.0 on ubuntu

i have downloaded qgis-1.8.0.tar.bz2 and I want to install it on my linux computer(12.04 LTS). How can I perform it please? I do it because I am desperate with Qgis 2.0.1 Dufour on ubuntu 12.04, ...
1
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2answers
139 views

Loading OSM data into QGIS

I have been trying to use OSM maps and my data is 60 GB around. I have imported it to QGIS as a vector layer but it seems the data is so big that the rendering is taking forever. My system has Intel ...
-3
votes
2answers
108 views

How can i create the spatial queries in QGIS? [closed]

please, Help me. i'll really appreciate your answers.
1
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2answers
500 views

QGIS: drawing order of lines and polygons (line between polygon)

I have 2 layers. One with forests and lakes (polygon) and one with rivers (line). Now I want the features to draw in that order: The river have to be UNDER the LAKES and the forest have to be UNDER ...
0
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1answer
152 views

QGIS QgsPluginLayer broken on 2.0.1?

Is there a generic issue with the QgsPluginLayer class in QGIS 2.0.1? When I take the basic Watermark sample from here: https://github.com/sourcepole/qgis-watermark-plugin and make a couple of mods ...
0
votes
2answers
129 views

Problem adding Delimited Text Layer in QGIS 2

I have a tab delimited text layer (text file created by excel for Mac) that I have used in QGIS 1.8 without problem. When I try to add the same layer, from the same text file, in QGIS 2.0 the Add ...
2
votes
1answer
197 views

Split and order lines by polygon intersection

I am using PostGIS and QGIS 2.2. I have a shapefile of rivers and a shapefile of state parks and other polygons. I would like to show the user a simplified version of a stream as a straight line, ...
0
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1answer
56 views

how to use two fields to control display format on map

I have a point shapefile with several numeric fields, among them FuelFlow and Slope. I have successfully applied colour to the various points according to the value of the FuelFlow field. Now I would ...
0
votes
1answer
350 views

PyQt4 pushbutton not connecting for my QGIS plugin

I'm trying to display information in a text browser with the push of a button in my QGIS plugin. The .ui is created using PyQt4 (button's object name is calcConso). No error message, but the button ...
0
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1answer
35 views

Is possible to create a new column of QGIS?

I want to create a new column according to the column A & column B. Column A 1 2 3 Column B A B C New Column 1:A 2:B 3:C How can I do that in QGIS? Thanks.
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2answers
148 views

Calculate length of line across zones with at least m accuracy

I have created lines between multiple points that are across MGA 54 and 55S (EPSG 28355). I am trying to calculate the distance between points but different methods give different answers (~1km ...
0
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1answer
85 views

Geographic Transformation Qgis

How to Define projection and enter the Geographic Transformation parameters from SGL-GEO to WGS84 in QGIS? Thanks
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0answers
188 views

Load MrSID file in QGIS 2.2 on Ubuntu 13.10

Is there a way to do this? I have tried a number of the write ups on this, and it appears that libgdal-mrsid-src no longer exists. Is there any other workaround? USDA NAIP imagery is sent as MrSID.
0
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1answer
183 views

QGIS linking census shapefiles with geocoded addresses

I'm trying to merge a census shapefile of New Orleans with a health outcomes dataset by address with QGIS. I have geocoded the addresses and added them as a layer in QGIS but don't know on which ...
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2answers
538 views

Polygon shapefile to Raster with Mask and Extent

I have a polygon shapefile (Vesijärvi lake). The lake has many islands, bays and inlets. When I look at the attribute table, there are actually two adjacent features: Northern lake and southern lake. ...
3
votes
3answers
112 views

Field calculator problem

I have an issue withe the field calculator. It is impossible for me to multiplicate 2 columns (area * KZ). The result is always "0". I used the formula area * KZ....is this the right formula? LINK to ...
2
votes
1answer
747 views

Problem creating point shapefiles programmatically using python in QGIS 2.2

I am trying to create a point shapefile in the memory buffer (for a temporary label) and then zoom to the extents on this buffer. The working (in version 2.1) test code for this is: def ...
1
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1answer
279 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 ...
5
votes
2answers
277 views

How to calculate the area between two line shapes?

I'm a newbie using QGIS (2.0). I'm trying to calculate the sidewalk area of a city. For that I have some shapes, extracted from Mricostation, with the topology (facades, fords, fences, etc.), but ...
2
votes
2answers
114 views

How to handle multiple space separator in Grass?

I try to load a Lidar point cloud in .xyz format to Grass (in QGIS 2.0.1). I tried to input the following options to the 'separator' field: tab, 'tab', '\t'. Just for the unlikely case that it ...
1
vote
1answer
139 views

How to perform a standard deviation stretch on a raster in QGIS

Is there a way to perform a (2) standard deviations stretch on a raster image in QGIS 2.2? I have found the raster styles menu, but the help says there is no help in my language (English) and whilst ...
1
vote
1answer
152 views

When I join a table to a shapefile and then export it the titles of the columns are transformed to data1, data2

I'm using QGIS 2.0.1 The table is in an excel format that i import through "add vector" and the shapefile is a polygone I join the attributes by right clicking the polygone-->properties-->join Then ...
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0answers
198 views

QGIS plug-in equivalent of ArcGIS's Spatial Analyst Tools -> Overlay/ Weighted Overlay

Specifically I have 12 .bil raster files that show monthly global mean minimum temperature. I file for each month. I want to combine these to create an ANNUAL global mean minimum temperature. In Arc I ...
0
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1answer
71 views

QGIS Legend horizontal not vertical

Hi is there an easy way to have the legend linked to the size of the box it is drawn in. So instead of running down the side of the page, it will be across the bottom in columns? Does that make ...
0
votes
2answers
280 views

Union in QGIS: missing polygon boundaries

I am trying to UNION two shapefiles in qgis. I use the geoprossesing tool UNION. Both sf are in the same coordinate system (same as in the project). In the resulting sf some polygon borders are ...
2
votes
3answers
548 views

Draw line between points from multiple datasets

I have 2 point datasets and want a tool or script to draw a line between all points in one dataset to all the points in the 2nd dataset. Is it possible? I have tried ESRI "Point Distance" and ...
0
votes
2answers
2k views

QGIS select features from attribute table using the “LIKE” operator

I created an expression with the help of the GUI in the QGIS attribute table of a vector (shapefile) layer of Native American ("Indian") reservations in the USA state of New Mexico. "NAME" LIKE ...
0
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0answers
26 views

Show the paths but not roadsides and driveways in the line layer

I want to display paths in the woods but the paths are all in One (line) layer that contains all roadsides, pavements, drivvays, but also paths, tractor road and other relevant roads in, and up to the ...
2
votes
1answer
380 views

Change contour line stroke weight based on elevation?

I have shapefiles of contour lines that I have imported in Qgis. At the moment the contour lines are all the same stroke weight. I'm a beginner to this program, but wanted to know if its possible to ...
3
votes
1answer
252 views

Exporting a QGIS layout with Addition on layers

I've been playing around with an approach in QGIS that uses Addition between the layers I'm mapping to build a tri-variate composite colour map - an example is here in the QGIS Flickr pool: ...
1
vote
1answer
152 views

Why can't QGIS open my KML file? [closed]

I have a kml file with multiple absolutely identical polygons but with different names. I need to load it to qgis and find points in these polygons. But I guess qgis thinks that multiple duplicated ...
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0answers
63 views

QGIS crashes when digitizing new fetaures

I can't currently digitize polygon features in QGIS 2.01 or 2.3. I can draw a set of points but as soon as I right click to finish the system crashes. It still works fine in 1.8. Windows 7 64
1
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1answer
331 views

QGIS Quickly switching overlapping raster images

I'm new to QGIS, and haven't used arcGIS in about 5 years, however I've just seen someone using arcGIS and was able to quickly switch between overlapping rasters when checking registration. The top ...
0
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2answers
177 views

Interpolation using GRASS plugin in QGIS

I have been using the IDW interpolation tool through GRASS plugin in QGIS and the interpolation output I am getting is for the entire mapset region. My question is: Is there a possibiltity that we ...
0
votes
1answer
278 views

Merging Raster: ImportError: No module named _gdal_array

When I try to merge rasters I got following error message: _gdal_array = swig_import_helper() File "C:\PROGRA~1\QGISDU~1\apps\Python27\lib\site-packages\osgeo\gdal_array.py", line 18, in ...
8
votes
5answers
369 views

Print out the properties of the attribute table in qgis?

I have to merge a lot of shapefiles into one great shapefile. So I want to compare the properties of the attribute tables to see if there are differences between the tableproperties of each shape ...