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

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3
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1answer
79 views

Cannot see OpenLayers under Plugin in QGIS 2.4

Although I have installed the OpenLayers plugin, I cannot see it in the list when I click on Plugins. Does anyone else have this issue?
3
votes
1answer
41 views

SAGA raster calculator, ifelse command syntax problem?

I am trying to get the saga raster calculator in QGIS to spit out all values of a raster that are inferior to 10, and make all other values zero. I think the syntax is correct but I keep getting the ...
1
vote
2answers
56 views

Does QGIS support dynamic display?

I'm a new developer of QGIS using C++. I am working on a project which needs to display dynamic maps/layers(just like GPS, but it is not GPS, however it should display data alike GPS data - dynamic ...
0
votes
0answers
7 views

QGIS server installation and configuration for Ubuntu 14.0.4 [duplicate]

Can anyone provide a step by step for installing and configuring QGIS server on Ubuntu? I have spent hours trying everything I could and installing everything I could but still can not get it to work. ...
2
votes
0answers
47 views

QGIS API - Print Composer Template produces empty map?

I have a print composer template which I'm trying to populate with different subset queries from a CSV-derived vector layer using the Python API. However, all the output PDFs contain everything except ...
3
votes
1answer
44 views

Get default values from PostGIS DB in QGIS 2.4 editor

One of my postgis tables tables automatically includes the nextval(xxx) in the edit feature form in qgis(and I think will also update ids of multiple features automatically). The other seems to have ...
0
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0answers
27 views

Graphical Modeler Equivalent in Arcmap? [duplicate]

Is there a similar interface as the QGIS Graphical Modeler in Arcmap for geoalgorithm development? If so can one develop a sequence in Arcmap and open it in QGIS? I would prefer using an 'Arcmap ...
1
vote
0answers
12 views

Multiply Rasters with Scalar Numbers as Input in QGIS Modeler

I built a little model in the QGIS modelbuilder which uses the raster calculator with the command gt(a,threshold) I need to run the model with varying thresholds from 2 to 30 so it would be ...
4
votes
0answers
48 views

Preparing Huff model with data to use in QGIS? [closed]

I'm trying to find out about the notion of potential of acessibility using the methods of Huff. I´m using QGIS, with point data (with the variables that I would like to use) and polygons for Europe ...
1
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0answers
28 views

How to share styles between layers in QGIS

Is it possible to share one style between different layers in QGIS? Now if I apply the same style from *.qml or use the same style from Style Manager for different layers then in *.qgs project file ...
1
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0answers
34 views

Categorized style hiding map

I am having an issue with the style properties of my map. I imported the US Zip Code Tabulation Area map from a government website, and in a separate excel file I have a list of people connected to ...
1
vote
1answer
29 views

Unable to save to in Geojson format with the correct projection

I have a shape file (Polygon) in Qgis that I wish to save in Geojson in order to display it with the mapbox javascript api. Original projection is in POSGAR 97 My issue is that it does not reproject ...
1
vote
0answers
15 views

R.Neighbors with large neighborhoods?

I'm running into problems running the r.neighbors GRASS command in QGIS. Although it will run for small neighborhoods as soon as I increase my neighborhood above a certain number it becomes unbearably ...
2
votes
1answer
33 views

Conditional Statements in QGIS raster calculator?

What is the equivalent statement of the following expression in the QGIS raster calculator? Con(((Abs("DEM" - "FSMin") > 120) | (Abs("DEM" - "FSMax") > 120)), 1, 0) I have no problem ...
1
vote
1answer
27 views

QGIS Contour plugin: Creating complex isolines leads to isolated areas

I use the contour plugin (v1.1) within QGIS 2.4 to create contour lines. I have streets with different travel costs. I observe problems for streets with low travel costs if they are surrounded by ...
1
vote
1answer
106 views

QGIS GRASS Missing Dependancy

I want to perform a view shed analysis in QGIS using GRASS 7 r.viewshed. When I double click on r.viewshed in GRASS GIS 7 commands in the processing toolbox of QGIS I get the following message: ...
1
vote
1answer
17 views

Problem with batch mode Saga Raster Calculator

I have to do a couple of raster multiplications for which the batch mode would save me a lot of time. But the only thing I get are rasters that contain nothing but nan values. If I multiply the ...
1
vote
0answers
16 views

Easy way to extract raster cells OUTSIDE a vector (Mask) layer in QGIS?

I have a raster file but am only interested in the cells outside a certain polygon. This polygon is very iregular and scattered across the raster. Is there any easy way to extract only the cells ...
1
vote
1answer
33 views

How to create cross sections from vector point layer in QGIS?

I have a set of points (X,Y,Z) across a river. Is there a way to present them as a cross section? I'm attaching a cross section I made in Excel: The X axis are the longtitude and the Y axis, the Z ...
1
vote
0answers
14 views

Shift between Open layer and vector layer QGIS 2.20 [duplicate]

Can you please help me solve this issue with Open Layer Plugin. I see some shift with a vector layer of Laos water boundaries when the background is Google Physical Layer.I am using CRS EPSG: 32647 ...
2
votes
2answers
64 views

Writing data into Esri *.mdb personal geodatabase using QGIS?

I have an empty *.mdb database that I have to fill with data. The problem is that I cannot install ArcGIS for Desktop on Ubuntu, so I decided to do it using QGIS 2.0.1 with a Grass plugin. However, ...
0
votes
0answers
30 views

Exporting feature class from gdb crashes ArcCatalog

I'm trying to export a polygon feature class from a file geodatabase created and managed using ArcCatalog. When I click "export" a dialog window pops up, then another that says script error, then ...
2
votes
1answer
47 views

How to manipulate lidar map using sun azimuth

Hi I am VERY new to QGIS and am struggling. I have a Lidar map and want to change the view so that the ground shadow is manipulated (looking for archaeological anomalies). I think it is the sun angle ...
1
vote
1answer
11 views

How can I shift raster layer for making cloud-shadow mask?

I want to make cloud shadow mask in QGIS. I have raster cloud mask and I have to shift it by X,Y coordinates. Is there any easy solution? Many thanks, Helena
2
votes
1answer
52 views

Why don't all the attributes in the SQL query appear in table?

I have an SQL query that works fine in the DB Manager but when I load the table as a layer one column does not get loaded. The different thing about this column is that it is static -- text generated ...
1
vote
2answers
77 views

How to use OS Terrain 50 in QGIS

I am new to GIS and I wish to perform view shed analysis of wind turbines from a DEM. I have downloaded OS Terrain 50 and the data is contained within numerous zipped folders. I am using a Mac with ...
1
vote
0answers
29 views

Vector seems to be only a pixel of a raster after reprojection

I have the South America hydro1k data for slopes and I am trying to extract the data using point sampling tool with a grid in Brazil's map. My problem is that, even though vector and raster seem to ...
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0answers
29 views

Retrieve a point coordinates from map canvas using QGIS API

I'm trying to build a plugin that firstly captures the map coordinates. I have tried to adapt the map tool explained in this post: How to programatically check for a mouse click in QGIS The code I ...
2
votes
1answer
143 views

Wind Farm Viewshed Analysis

I am new to GIS and I want to run several view shed analysis operations for wind turbines located in the North of England I have installed QGIS and have the GRASS r.los plug in installed for line of ...
1
vote
2answers
72 views

Qgis server on Ubuntu Server 14.04: Permission denied

I'm trying to install and configure Qgis Server (2.0.1) on a virtual server with ubuntu 14.04, Apache 2.4.7. After trying to install normally, the server gave me 404 error, so I tried to add ...
2
votes
0answers
19 views

Memory layer or QgsVectorFileWriter Error?

Currently this excerpt of code will not save to file (as it is supposed to). The memory layer is visable and editable. Yet even when manually saving the layer, any priorly added features ...
3
votes
1answer
54 views

Open QGIS project on different computers

I have multiple QGIS projects that need to go to different computers. I put all the files on a USB and loaded it under "Documents" on the other computers like it is saved on my own computer. ...
1
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0answers
15 views

splitting polygons by semi-automated classified raster and into multipolygons

I am studying glaciers. Most of them in my case are partly covered by debris (i.g rocks) and partly not. So I ran an automatic classification to recognize these two type of coverages and produced a ...
3
votes
1answer
68 views

QGIS 2.4 Not Importing ExtendedData from Self-Exported KML

I've been scouring the internet for the past few hours, and I just can't seem to figure it out! Is it just me? I am using Quantum GIS 2.4.0-Chugiak. Here are my simple steps: 1) I create a new ...
1
vote
1answer
34 views

Memory Vector Layer Corrupted?

I was working with a large data set that had data for roads, rivers, railways, etc. all together so I decided to break the different data out so I could label it differently on the map and check each ...
1
vote
0answers
29 views

Joining polygons with same boundaries

Sorry if my question feel stupid but I'm a new QGIS 2.4 user. My shape is composed of 7 polygons which are supposed to be adjacent (ie sharing sharing same nodes). Would like to join the polygons by ...
1
vote
0answers
9 views

Proper updating of new memory layer geometry?

Current workflow for a toolbar button: -create memory layer -save memory layer to shapefile Then the user uses the built-in QGIS tools to add geometry and finally saves changes via the auto prompt ...
2
votes
2answers
38 views

How to color lat/lon points in given RGB data?

I am using QGIS on a Mac. I am working with hydroacoustic data for mapping and interpreting the seafloor. Data are collected, processed and interpreted. The result is a txt file with Lat and Lon in ...
-1
votes
0answers
20 views

How can I get WPS contour from only giving interval value to geoserver?

In my openlayers example I am giving all the values from where its starting. For example, with values like 540,570,600,630,660,690,720: here 540 is starting and 720 is ending, interval is 30. I got ...
2
votes
1answer
25 views

QgsMapCanvas.reresh() does not reload new wfs layer features, but panning does

I have a wfs layer loaded in a standalone QGIS app, which I am updating by running a database query on the view it is based on. The feature is added with no problems and I reload the layer with: # ...
6
votes
2answers
242 views

Versions of Python & QGIS for new user to both to install?

I have used GIS (very basic functions), but now want to be able to customize to my needs. My initial research leads me to believe that Python + QGIS is the way to go. I understand that there are ...
2
votes
2answers
53 views

How to change precision on a column in the attribute table without losing data?

I have data in an Excel-file that I want to join with a shapefile in my project. The Excel-file contains values like volumes. The Excel-file and the shapefile I want to join it with both contain the ...
1
vote
1answer
104 views

Simplifying Shapefile without risking Spatial Accuracy?

I am building a feature for a web application. Basically would use the ABS (Australian Business Statistics) data to render the regions on the Google Maps. I am able to implement the basic working ...
-1
votes
1answer
16 views

QGIS, Multiple lines and wrap on character? [duplicate]

How to make wrap on characters in Labeling layer settings. I tried various solutions, but it works. Does anyone know how to do?
2
votes
1answer
26 views

QGIS - delete polys based on vector line layer - possible?

I have a layer of polygons and a layer of vector lines. I want to delete any poly that is touched/crossed/intersects a vector line. Is this possible? I have tried the Geoprocessing Tools. Looks ...
1
vote
1answer
31 views

I'm not able to save edited layer connected via PostGIS in QGIS

I have project and i was doing editing layers in QGIS. These layers are connected in QGIS via PostGIS. 1 layer of the 4 layers was saved correctly but other layers gave me error message. Error ...
0
votes
0answers
27 views

Keep leading zeros when importing .csv into QGIS?

I'm having issues getting QGIS to retain leading zeros when I import a .csv file. I have zip codes I am trying to read in and I need the leading zeros. I am not super familiar with GIS, so please ...
1
vote
0answers
15 views

QGIS2.4.0: Cannot import qgis module in python “from qgis._core import * \n DLL Load Error”

Having some trouble importing qgis into python. I'm very new to python so it could be a simple mistake. The path seems to be correct. It gets this far: File "<stdin>", line 1, in ...
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vote
0answers
54 views

Copy parts from several attribute tables in shapefiles?

I have several shapefiles from which I wish to take parts from their attributes tables to make a new attributes table. Is this possible without destroying the original attributes table? I have ...
3
votes
1answer
31 views

QGIS: Plot a layer given with Longitudes [0 360] to [-180 180]

I have a world map in correct Longitudes from -180° to 180°. Additionally, I have a shapefile of data from South America, which shows at 290° instead of -70°. How can I reproject it using QGIS?