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

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7 views

QGIS Raster Calculator, joining two raster

In QGIS raster calculator I do: Plus (+) And I get: The red circle in the middle is like cut in the result, QGIS it's not adding every pixel on each raster, it makes a kind of ...
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2answers
8 views

Error in executing commands in GRASS GIS

I'm using Grass 6.4.3RC2. I have a problem because when I execute the command: r.radcov csv_file=cell_list_hataDEM_umts_amc_testTEST.csv dem_map-AlbSRTMdem@PERMANENT clutter_map=AlbClut@PERMANENT ...
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0answers
10 views

QGIS 2.8.1 print composer wont export all OpenCycleMap base layer tiles

My set-up is Linux Mint 17.1, 32- bit system, QGIS 2.8.1-Wien. I have a map with 5 layers. In Print Composer the extent of the map is 32.5km x 22km square and the print page size is A1. I am ...
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1answer
16 views

QGIS won't read table columns in CSV import

I am trying to import a CSV file to QGIS, but it ends up looking like my print screen below (program is in Swedish but in the preview window you can how QGIS won't read my data correctly). I can't ...
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0answers
10 views

How to get a time cost related to polyline geometric characteristics in postgis using OSM data?

I'm trying to make an isochrone mapping of the emergency facilities in my region, I'm using a street map loaded in postgis by osm2pgrouting, data is supplied by OSM. The only cost I got for every ...
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0answers
23 views

Creating custom map in QGIS?

I want to create an interactive map in qgis using this image but i cant understand the tutorials on youtube. I learned that it is georeferencing but the y already have shapefiles when using ...
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1answer
20 views

How to change the QGIS edit cursor and node icons?

Two things I really dislike at QGIS, are the "fat" node icons (when editing lines) and the cursor which cover the object below and make it impossible to accurately move a node. Is it possible to ...
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1answer
32 views

Getting only points when importing from OSM to Postgresql

This is my very first time working with OpenStreetMap data so feel free to tell me if I am forgetting important information. I am trying to import some data from OpenStreetMap into PostGreSQL. I ...
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1answer
23 views

Clipping a raster layer with a shapefile on mac

I am trying to clip a raster layer using the raster clipper function. However, for some reason this is not working for me and I haven't been able to find the answer anywhere. I choose my raster ...
1
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1answer
27 views

QGIS Modeler flexibility and errors?

I'm trying to build a simple multi-step selection (by attribute) with the QGIS Modeler. I created a simple sample layer to avoid data-driven errors. Now I want to query the layer and select features ...
1
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1answer
11 views

Use raster memory layer from QGIS processing result

I want to apply subsequent QGIS raster processing algorithms in a python script. I want to use memory layers for intermediate calculation results since I am only interested in the end result. As ...
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0answers
31 views

Why is my map zoomed in so ragged compared to what I actually drawed in QGIS

So overall my map looks the same like what I draw in QGIS. The issue is that when I zoom in, in that case 54x then you can see ragged lines. QGIS Browser That is not what I need. I need high ...
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0answers
5 views

QGIS web client installation: this.projectSettings.capability is undefined

I am trying to debug my configuration of QGIS web client. I have the same problem illustrated here (the GIS-Browser appears but it keeps loading map for the two sample projects ). Yet following the ...
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0answers
19 views

Converting Elevation Raster to Contours

I am trying to convert multiple elevation raster files into contour lines, but the contour shapefiles all just end up on top of each other on my map. I can't get them to be where they're suppose to ...
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0answers
24 views

QGIS expression: select from <layer> possible?

I have a project file with many nested layers and would like to query certain layers without having to click on them first. The expression tool however requires me to select the layer I want to query. ...
2
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1answer
20 views

How to delete a column from the attribute table of a SpatiaLite layer?

I want to delete a column from Attribute table but the function "Delete columns" isn't highlighted. (When I am adding new layers I use New SpatiaLite layer, not Shapefile layer). So I have installed ...
1
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1answer
18 views

How to select from selection with PyQGIS?

The expression box has a handy "select from selection" button. Is there a way to emulate this with python? I have the basic expressions down, but can't find a way to do this.
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0answers
15 views

How to load “soil types” in QGis?

I want to show soil transmissivity per pixel. Thus, I determine water holding capacity of each pixel (ignored other effective parameters). Respectively, I wonder, What is the soil data format and How ...
2
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3answers
25 views

QGIS python plugin appends values every time it's started

I've written a small python plugin (using plugin builder as base) to simplify the expression process for a given layer (just a few comboboxes that are used to create a query). The combo box populating ...
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0answers
30 views

Problem between files with same coordinate reference system

I have 2 shape-files. The first created with Qgis and the other with R studio(driver=ESRI). When I import them in qgis i see they doesn't "fit". Both have EPSG:4326 - WGS 84. The only difference I ...
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1answer
28 views

new layer from calculations with fields of other layers in QGIS

I've two layers, both with the same fields: A, V, where A is the shape's area and V a value given by me. I want a new layer with shape created by the intersection of the other layers' shapes and a ...
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0answers
20 views

Problem with QGIS - Attribute names are shown as _1,_2,_3 … and Strings are displayed as “NULL”

Whenever I look at the attribute table or at the attribute dialog for a shape, the attribute names are shown as _1,_2,_3, ... In the attributes, Strings are generally displayed as "NULL". Numbers are ...
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0answers
19 views

Why processing.runalg(“gdalogr:rasterize”…) is not creating out files when running in the QGIS 2.6.0 console?

I want to the QGIS python scripting functions to turn to rasterize a point vector using many different dimensions. Right now my code looks like this: import processing RasterPixelSize = ...
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1answer
18 views

Can't compile plugin builder plugin in QGIS 2.4 (Windows)

I'm trying to build a basic plugin using plugin builder but I can't even compile it. I tried following a few tutorials and just trying to compile whatever but that always results in the same problem. ...
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0answers
32 views

In QGIS heatmap howto establish a fixed maximum range value for comparisons over time?

I have several data sets that represent a type of activity within a specific geographic boundary. Each heatmap I create shows the relative activity spread nicely, but I have been frustrated in my ...
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1answer
60 views

QGIS and Ubuntu 14.04 unmet dependency

I posted this on digitalocean, but it's imperative I resolve this problem. Freshly updated 14.04 and I went from trying qgis.org debian to the ubuntugis repo. Results: xx@XX:~$ sudo apt-get install ...
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1answer
24 views

Workaround for grouped layers to stay collapsed when opening project

Using QGIS 2.6.1 on Windows 7, whenever I open a project containing layers in various groups, they appear expanded. This is regardless if the project is saved when the layers are collapsed. I'm ...
2
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2answers
74 views

How to convert a vector map to raster in Qgis?

I am creating a thematic map (vector data) with different classes. How to convert this vector map to a raster map, keeping the classification?
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0answers
31 views

error while trying to compile quantum gis: unresolved external symbol class QwtIntervalData [on hold]

While trying to build qgis-2.6.1 from source on windows 7 32 bit with mvc++ 2008 I got the overall result ========== Rebuild All: 281 succeeded, 3 failed, 0 skipped ========== from this I am able to ...
3
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1answer
76 views

Can QGIS 2.8 load WMTS layers?

I'm having a bit of an issue loading a WMTS into QGIS 2.8. The application can connect to the WMTS, correctly identify the layers that are available and load the layer into the layer pane. However, ...
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0answers
33 views

Error when creating a new mapset with GRASS in QGIS

When I try to create a New Mapset with the GRASS plugin in QGIS I get an error or the program crashes. QGIS 2.6.1 (32-bit install, Win7). QGIS crashes completely when clicking "Finish" in the New ...
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1answer
23 views

Rotation matrix in the EPSG

I use Proj4j for a WebGIS and I have to create a new ESPG. I tried on QGIS to convert coordinates from a local system (in Greece) to a world coordinates system. First, I have to do a 2D ...
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0answers
28 views

How to get rid of lines within merged poligons?

Sometimes, when I merge polygons there are still some lines showing within them (see screenshot). How can I get rid of them?
2
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0answers
16 views

Identify tool and highlighting behaviour in QGIS 2.6

I have a problem with the identify tool in QGIS 2.6. Somehow the object highlighting doesn't go off when i click on another object with the identify tool in QGIS. In earlier versions, when you ...
2
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0answers
11 views

Extract from a linestring layer, groups of linestrings to a multilinestring objects layer

I've got a linestring layer with thousands of linestrings. I want to extract groups of linestrings to individual multilinestring objects. In the following picture you can see a part of the layer ...
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1answer
25 views

QGIS and arcmap compatibility in image georeferencing

I have georeferenced an image in QGIS but when I imported it to arcmap 10.0 it saying "In consistent extent". Any one know how to solve it?
1
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1answer
29 views

Current field of view specific legends in QGIS

Is it possible to make QGIS generate a legend that is based only on the field visible in composer? There was a ticket marked as resolved 5months ago with this question but it doesnt divulge the ...
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0answers
26 views

Worldfile incorrect? Puzzler: all resources supplied!

Trying to manually create a worldfile for gif images of surface currents supplied by the navy here. I have QGIS and am decent at using it but the world file tool is failing without error on me (even ...
2
votes
1answer
21 views

QGIS Merged Layers/ Cannot Find Windows “minidump” to Restore Past version off Dropbox

I've copied a layer style and was playing around with the display of a point layer when QGIS Valmiera 2.2 crashed. A recently-created polygon layers attributes are now appearing in the place of ...
1
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1answer
71 views

Unable to change the fonts of the legend in QGIS 2.8

I'm running QGIS 2.8.0-Wien on my Ubuntu box and came across odd behaviour of print composer. When adding a legend - I'm unable to change the font size of the title and items. Bizarrely - in the ...
4
votes
1answer
50 views

Measuring Sinuosity of Walking Paths

I'm currently working on a project that examines the movement of consumers through different kinds of retail spaces in Central Asia – namely, bazaars versus supermarkets. I've equipped dozens of ...
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0answers
66 views

SAGA installation in QGIS 2.8 linux

I install QGIS 2.8 in debian (linux) through nightly jessie (qgis testing) and I see that SAGA is not in processing toolbox, so I install saga gis software but still it doesn't appear in processing. ...
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0answers
28 views

Layout points along a line at varying distances

I am new to QGIS, and have some minor experience with ArcGIS. I am trying to lay out sewer taps (connections) along existing sewer main lines in QGIS, from old construction notebooks. The lines run ...
2
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0answers
22 views

How to create a syntesis map ( eg. climatic vulnerability) in Qgis [duplicate]

My final goal is to create a synthesis map of climatic vulnerabilities composed by different thematic variable with different weights. I would like to ask for support for the following issues: For ...
1
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1answer
20 views

Error adding MrSID raster layer to QGIS for Mac OS X 10.10.2 (Yosemite)

I want to add a MrSID layer to QGIS (version 2.6.1) with a computer running Mac OS X Yosemite. I installed QGIS through macports from the terminal and all python packages through macports, as well. I ...
4
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1answer
51 views

How to calculate “water accumulated in each cell” using QGis?

I create channel network and catchment area from a DEM with SAGA GIS. I know that flow is starting from a cell to an other cell. Firstly, a cell is filled with water and then it is starting to flow ...
5
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2answers
155 views

How to make a bivariate colour ramp with QGIS, R or similar?

Many recent maps I have seen have these neat two-way color gradients that can be used to color correlations between continuous estimates. Here is an example taken from a recent publication (Source: ...
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1answer
42 views

How to get a layer by name in PyQGIS?

I have a plugin which finds buffer for list of cities, provided the distance. The state and city names are taken from the attribute table and gets filtered accordingly. What I want is My plugin should ...
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2answers
38 views

Representation of precipitation data

I have an excel sheet of precipitation data of each month of some districts. I have also the shapefiles of these districts. How can I represent this data in these shapefiles.
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0answers
24 views

QGIS change raster tiles properties at once

I have a set of several raster tiles and I need to change the properties of each one, by setting up a transparency for instance. I have found no other solution but changing properties of each one at a ...