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

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2 views

QGIS shuts down when I try to open a “.sos” file

I am trying to open a ".sos" file in QGIS. I have QGIS installed using OSGeo4W and added the gdal-sosi package. This should do the trick. But QGIS just shuts down when I try to open the fil. It does ...
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10 views

How to ceate new vector layers / save output in QGIS scripting?

I need to create a script in QGIS which stores outputs. In this case, official documentation didn't help to me. When I use geoprocessing (processing.runalg()) for vector layers. In some cases, output ...
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1answer
10 views

QGIS leaflet web map layers - spaces

When I export a QGIS project to a leaflet webmap using QGIS2Leaf, is there a way I can have my layer names display with spaces. So for example in the image I would like OffshoreSACS to display as ...
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1answer
17 views

“Get” results of PostGIS

I am getting warm with post PostGIS. I am working in the Command Line. What I am wondering is how do I "get" the results of PostGIS. So imagine I have this select name, neighname from neighborhoods ...
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0answers
5 views

Negative reflectance values from raster calculator computation of GeoEye-1 image

I tried to convert DN values of a pansharpened 2010 GeoEye-1 image into radiance then reflectance in QGIS using raster calculator with the following formulas: (1) L= gain* DN + bias; (2) p = pi* L* ...
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0answers
8 views

Preprocessing GeoEye-1 in GRASS iatcorr

I am trying to do a study on land use change using three high-res images of an area from three sources (Quickbird, GeoEye-1, WV-3). I have managed to calibrate the Quickbird data using QGIS raster ...
3
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1answer
35 views

How to center continuous raster layer by subtracting mean and dividing by standard deviation using QGIS raster calculator?

I'm trying to extrapolate a spatial model to a map in QGIS using the raster calculator. The model predicts the value of a pixel given the environmental conditions at this location (e.g. elevation, ...
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1answer
9 views

Exporting KML from QGIS with relation (one-to-many) table as popup

Here is a challenging one for someone. I have two tables in QGIS. Holes (parent) - Which contains the borehole locations. Strata (child) - which has many rows that contain the strata for each ...
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0answers
14 views

Least cost path analysis : a lot of sources and destinations

I'm working on a 15*10 km area, splatted in a 50*50 m cell grid. I want to compute the time needed to travel from a single starting point to each cell centroid, combining driving and walking time. I ...
0
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1answer
12 views

How to create a rule-based gradient using an expression

I am mapping points with values from 0-100 and want to display these using a gradient color scheme. However I also want to specify the breaks as regular intervals along this range. For a gradient QGIS ...
1
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1answer
18 views

How to update raster color ramp with new min/max values using PyQGIS?

I'm trying to update a single band psuedo color renderer with new min/max values from the python console. All the code samples i have been able to find deal with constructing a renderer from scratch, ...
1
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2answers
28 views

Changing style in ModelBuilder?

Is it possible to have the output features of a model have a specific visual style? The features come out in a random assortment of colors and very small. Is there a tool for this? or any suggestions? ...
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1answer
24 views

Pulling a cvs file from a website into QGIS with the ability to automatically refresh.

I am attempting to pull a cvs file from a website that is updated daily. I would like to have a process that can automatically perform the process and save daily as a new layer. The cvs file is ...
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0answers
7 views

Add save/commit button to custom feature from

I would like to add a save/commit button to a custom QGIS feature from. This is very helpful when there is a linked table dispayed on the same form - the link will work only once the main table has ...
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0answers
15 views

How to fill holes/missing values in XYZ data / a DEM with QGIS?

I have equidistant XYZ point (text) data that I used to create a point grid. However, it's not perfect - there are some holes. I then created a DSM raster from it, which obviously has the holes too. ...
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0answers
13 views

QGIS 2.8 Plugin Icon not Showing in the plugin information pane

I created a QGIS plugin with Plugin Builder. Even though the icon set in the metadata.txt is displayed in the Plugin Manager list (left to the plugin name in the installed plugin list), it is not ...
1
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1answer
10 views

Transform from Lambert Azimuthal “old” to ETRS89_LAEA

I'm currently struggling to convert a small raster dataset with Lambert Azimuthal "old" projection : +proj=laea +lat_0=48 +lon_0=9 +x_0=0 +y_0=0 +R=6378388 +units=m to the projection EPSG:3035 ...
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0answers
4 views

Load and View Layers with Specific Symbology in QGIS form

I want to create a form to access my desired layers with defined symbology through some push Buttons in QGIS. when you click a button, specific layer with a defined symbology will be shown, Could you ...
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2answers
24 views

How to link polygon features in one layer to polygon features in another, using largest overlap in QGIS or GRASS [duplicate]

I have two polygon layers: the first one contains small land lots (green in the image), the second one contains large zones (the purple line in the image attached separates 2 such zones). I want to ...
2
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4answers
40 views

How to create different size of bubbles with different colors? [duplicate]

I have a set of points with fields like 'TYPE','SIZE','SALES VOLUME',what i would like to do in QGIS is: Apply different color code by 'TYPE', Apply graduated size of bubble circles based on 'SIZE' ...
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2answers
34 views

How to stylize KML layers for Google Maps?

I am using QGIS 2.0 to convert my shapefiles into KML layers. The purpose of converting my shapefiles into KML layers is to bypass the restriction imposed by Google Fusion Maps, which only allows ...
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0answers
20 views

Distance Matrix analysis for QGIS 2.8 using one layer

I'm using QGIS 2.8's Distance Matrix tool to find distances to nearest neighboring points on a single layer. I've followed roughly the instructions on this site and adapted it to my needs. However, ...
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0answers
35 views

Point to raster: QGIS vs ArcMap

I have an equidistant point grid (0.5m) and created a raster from it in QGIS and ArcMap, with different results: QGIS: Raster -> Conversion -> Rasterize Result: raster, with points in the top left ...
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0answers
17 views

How to set qgis custom forms size?

I'm facing an issue close to the one posted there : Stop custom attribute form from resizing in Qgis with QGIS 2.8.2. I've got two layers with custom forms. Layer 1 form is much bigger than layer 2 ...
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0answers
10 views

Default item on legend for QGIS

when I make a legend in QGIS, everything shows up how it should except for one item. The item is just a pale brown color that says "default". I can't find this item in any of my layers and have no ...
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0answers
16 views

Showing the composition in QGIS [on hold]

I´m currently using QGIS 2.8.1 and have create a plugin with the pluginbuilder. I´m trying to create a composed layout and want to show the layoutcomposer to the user at the end. I´ve done the ...
1
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0answers
10 views

How to run the QGIS viewshed plugin from the console?

I want to run the viewshed plugin from the console/ in a script in QGIS. Do you know if this is possible?
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0answers
35 views

How to pull data from multiple databases via Qt .ui form?

Using a single .ui form and wthin QGIS, can I show multiple records from another table that is associated with a single polygon? Table 1 contains planning applications ref Table 2 contains multiple ...
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0answers
21 views

How to process a big number of raster outputs?

I am new to python and QGIS. I'm trying to take some simple operations (e.g. count, average) over a big number of raster maps from a python script. I'm using the "r.series" algorithm (from processing) ...
0
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0answers
6 views

Plugin c++ - QGIS [duplicate]

I'd like to know how can i create extension in c++ by using QtCreator, for QGis 2.8 ? Thank you for helping me.
1
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2answers
18 views

What is “Simplify tolerance” in QGIS's Simplify geometries tool?

I am trying to use QGIS 2.8 to simplify vector geometries. But I do not understand the significance of the Simplify tolerance value in the Simplify geometries tool. The documentation does not ...
1
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0answers
21 views

How do I add packages to Standalone Qgis's Python?

I have installed the QGIS 2.8 on my Windows 8.1 system, using the Standalone Installer. I now wish to install the VectorBender plugin. The docs for this plugin say, that I need to install matplotlib ...
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0answers
19 views

Different colors of rasters after loading back to QGIS

I am experiencing this issue longer time but sometimes it is really annoying so I would like to solve it. When I save an image from QGIS - no matter when using Project/Save as image or using Export ...
1
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2answers
46 views

How to map a building to only one grid which contain more than half of its area using qgis?

I have a shapefile of a city map and I have created vector grid as polygons. After intersecting the two shapefiles, a building will map to all the grids it overlaps. However, if I just want it to ...
0
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0answers
17 views

Using Esri grid format (*.adf) for raster calculation in QGIS?

I got problem with the ADF raster file. In fact I have a land use map in ADF file and I am trying to perform some raster calculation(from raster calculator) but its not working.I have also changed ...
3
votes
1answer
44 views

How can I use boolean value in QGIS style rule?

I'm trying to make a style based on rules, and I want to use a boolean field I have created for that. But I do the following: "field" like 'TRUE' "field" like TRUE "field" like 1 "field" like '1' ...
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0answers
28 views

Collecting data [on hold]

I'm using qgis, i'd like to know if there's an app that i can install on a tablet for collecting data, and after by connecting the tablet on my computer in order to upload the data ?
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0answers
20 views

Aggregating raster pixels in coarser resolution

I am trying to aggregate 3 meters resolution land use map to coarser 30 meter resolution in QGIS or ArcMap.In fact I wanna make similar with Landsat MSS and TIR resolution.Could anyone please help me? ...
0
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1answer
25 views

How to find the path after “cannot find module” message when I try to use grass tools in qgis [on hold]

I use mac and when I try to use grass modules in qgis (brighton) I get a "cannot find module" message.
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2answers
35 views

Running the ogr2ogr utilities in a batch file. Problems with command project

I have made a batch file containing a list of two commands. The first (-clipsrc) works properly, but the second not (-s_srs EPSG:4326 -t_srs EPSG:3857). Could anyone tell me where is the fail?. This ...
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0answers
29 views

I am building QGIS 2.6.1 from source code on windows 7, 32 bit and after successfully building all projects I get this error

Couldn't load PyQGIS. Python support will be disabled. Traceback (most recent call last): File "", line 1, in ImportError: No module named qgis.core Python version: 2.7.4 (default, Apr ...
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0answers
9 views

AddFeatures returned values …?

i try to add Features in a polygon vector layer. i'm using for example the following lines : fet.setGeometry(ft_com.geometry()) bool=pro.addFeatures([fet]) bool returns me True (i see the added ...
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0answers
20 views

Automated Viewshed in QGIS

I want to create a workflow with a QGIS script where I need a viewshed tool. There is a really cool viewshed plugin. Unfortunately I am not able to access it in the QGIS console. I also found out that ...
0
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0answers
10 views

Static link to latest QGIS version

I am trying to set up a local "mirror" of the latest version of QGIS using "Download station" in a Synology NAS. The intention is to provide the newest version of QGIS on a local network without ...
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0answers
32 views

Vector to Raster using GDAL (gdal.RasterizeLayer) : Error in Output Raster(generating output raster with NAN values)

For rasterizing a vector layer, I have tried gdal.RasterizeLayer method for converting vector(shapefile) to raster(tiff). But its giving raster output with NAN values(complete black image). I need ...
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0answers
19 views

Rectangular bounding box curved in D3.js

I am trying to project polygons to a map with a static background image using D3.js. The polygons looked slightly off in relation to the background so I drew the bounding box of the image, and sure ...
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0answers
37 views

Print an Automated Selection of Point Features

I have a point layer with around 1.3 million features where one of the columns in the attributes table contains dates in the format YYYY-MM-DD. Starting from an arbitrary date, say 2001-01-01, I ...
0
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1answer
42 views

How to publish a single (standardized) QGIS symbology which relates to different datasets of same schema?

Given a specific (locally extended/stored) symbology and styling in QGIS which refers to several different shapefiles or tables (GeoPackage/Spatialite), how can I easily move or share this with ...
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2answers
28 views

How to deactivate the Color Ramp in QGIS graduated vector styling?

I want to display points with different size and I DO NOT want to have a color ramp. Do you know how I can do that?
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0answers
23 views

How not to enforce lowercase field names in Spatialite?

I use a geojson file to publish a webmap. When I need to update the data I convert it to Spatialite, add the data, then convert back to geojson. Recently in QGIS 2.8 I found that the column names ...