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

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5 views

Keep “no data” tiles as “no data” w/ proximity (raster distance) operation

Working in QGIS 2.8.1 Wien. I have a raster file with three classes: "No data" for tiles outside of the country of interest's bounds "0" for tiles that correspond to roads "1" for all other tiles. ...
1
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1answer
10 views

Keep “no data” tiles with r.reclass rules

Working in QGIS 2.8.1-Wien. I want to reclassify a raster with the r.reclass GRASS 7 tool, but want to keep the "no data" tiles as "no data". I understand that I need to create a text "rules" file ...
-2
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0answers
12 views

Can OpenOffice database files be imported into iTree in lieu of mdb files [on hold]

can odb files work in place of mdb files for data input into iTree?
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0answers
16 views

Singlepart to multipart not producing results

I have a line - a street downloaded from OSM. It is in separate parts geometrically, but is contained in one record in the attribute table. That means it is only one row. I would like to split this ...
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0answers
13 views

In QGIS add new attribute table features from updated csv

In QGIS I created a point layer from a csv using "add delimited text layer" (the comma icon). I set style and viewing scales the way I want for the layer. Since then the csv has been expanded with ...
0
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0answers
10 views

QGIS: Points in Polyon with two different CRS [duplicate]

I'm relatively new to QGIS. I've got a layer that shows the boundaries of the wards in the UK. In addition to this, I've got a csv file, which has long/lat plus an answer (binary). The problem is, ...
0
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0answers
14 views

My OSM country roads network is not routable [duplicate]

I need a routable shapefile in order to execute pgrouting algorithms. I download a national zip from http://download.geofabrik.de/europe/greece-latest.shp.zip and import the roads shapefile in my ...
1
vote
1answer
24 views

replace records in layer with records form another layer by id and column name QGIS

I have a two polyline layers - one with 2800 rows, the other with 150 rows. Each row has a unique id column. I need to replace the records in one column of the the 2800-row layer with the records ...
2
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2answers
35 views

Is it possible to change the legend so the symbol is on the right side?

Is it possible to change the legend arrangement so the symbol will be in right side and the label description will be in the left side? The QGIS default is label description in the right side and the ...
0
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1answer
18 views

Can I consider QGIS OpenLayer basemaps as WMSs?

I am writing a manuscript about QGIS, and I categorized the data types into 3 classes according to popularity (raster, vector, web-data). Then I separated web-data to WMS and WFS. Under the heading ...
-1
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0answers
29 views

Can anyone tell me a project (title, materials, resource link) that can help me learn qgis software in depth? [on hold]

I know this is not a question specific to the software. But I was wondering if anyone can help me find a project that can help learn qgis and gis as a whole as learning from tutorials is quite boring. ...
0
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0answers
17 views

Join Attributes By Location inside QGIS modeler still fails to compute sums

Recently, a question was asked about the spatial join tool, and its failure to calculate the desired data. I ran into the same problem, but none of the solutions that were offered there solved it. ...
0
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0answers
31 views

How to modify the QGIS software? [on hold]

How can change the word Save when you hover on the saving button in the QGIS software to Saved ?
1
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1answer
33 views

Add lat/lng to Shape File [duplicate]

I'm new to GIS. I have a shape file (shp) that I need to add lat/lng coordinates too. I used QGIS to open the file and selected Processing->ToolBox->QGIS geoalgorithms->Vector geometry ...
0
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0answers
17 views

basin creation GRASS vs. flow direction

I have a strange behaviour in QGIS with GRASS tools. I am trying to create basins in the alp region and use he SRTM3 data. As I can see on the flow direction raster the SRTM3 data seems to act nice: ...
2
votes
1answer
46 views

How can I create an average/center line in from multiples lines?

I have some polylines. The origin of every line is the same and I would like to obtain the geometric centre of all the lines represented by a new polyline which must be the centroid of the lines. How ...
1
vote
1answer
33 views

How to derive a hydrologically correct DEM from point shapefile using QGIS?

I used grass gis v.surf.rst function to interpolate a surface using vector points. But it is very difficult to find a optimum parameters to be used. I am still unable to develop a accurate terrain
2
votes
1answer
17 views

MMQGIS plugin causes QGIS crash while geocoding

When trying to geocode data with MMQGIS pulgin (Google Maps) the QGIS crashes (not responding). I even tried to divide data into smaller sets but it does not help.
1
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3answers
48 views

How to create a line with all attribute information of the original GPX points?

I am trying to make a shapefile line contain all the data that the GPX file has. So i load the gpx file into Qgis, (prompts me for tracks, waypoints, trackpoints, routes, etc) When i choose ...
5
votes
1answer
72 views

How to build a query/expression to select specific points within a buffer? (in QGIS)

I have a point layer in QGIS. Each point represents a tree and each tree has information about its height as an attribute. I would like to build a query/expression to select all those trees that have ...
1
vote
1answer
18 views

export more than one but not all attributes with qgis2web

Using the qgis2web plugin: Is it possible to select more than one but not all attributes to be shown as popup? I can select all attributes or only one attribute to be shown. but not for example two ...
0
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0answers
9 views

module object has no attribute classFactory

I asked this question several days ago on the QGIS developer list but didn't get any love. I'm hoping someone can help me resolve this error. I have a custom repo and a custom plugin that I'm ...
0
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0answers
14 views

GRASS unable to download any extension from GRASS Addons

I'm trying to install some add-ons to GRASS, but each time I try to download an addon, I'm getting the same error: g.extension.py extension=v.autokrige ...
0
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0answers
10 views

raster doesn't redraw to fit the canvas after a zoom in and a pan

i am working with qgis 2.8.2, c++ api and qt 4.8.5 i have a layer in the mapcanvas, this layer contains a raster ( a georef tif picture ) when i zoom in, the raster fill the entire canvas , ok but if ...
2
votes
1answer
18 views

In QGIS combine multiple polygon parts of a single feature

This is a repost of my unsolved QGIS dilema. The image shows a single selected feature that consists of two polygons and the corresponding attribute table. Some nodes of the left poly have been ...
4
votes
1answer
36 views

How to toggle group visibility in QGIS using Python?

I've tried this, but it doesn't work out. root = QgsProject.instance().layerTreeRoot() group1 = root.insertGroup(0, "PGB") legend = i.legendInterface() legend.isGroupVisible(group1) ...
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0answers
30 views

Building QGIS 2.8.6 on Win 7 32bit?

I'm trying to build QGIS 2.8.6 on Windows 7 32 bit using MSVC Express 10. The build process completes without errors, but with a bunch of warnings. When I run the qgis.exe after installation, it only ...
1
vote
2answers
79 views

Why do my points end up in Africa? (should be Croatia)

I have the correct coordinates in a excel file, but when I import the file, the point always goes to the wrong place. (I need it in Croatia, and it puts the point in Africa) I've tried chaging CRS ...
1
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0answers
16 views

distributing QGIS via OPSI

Is anyone experienced in distributing QGIS via OPSI (Open PC server integration, http://www.opsi.org/en)? I think this requires an msi package, has anyone built one from the qgis.exe installer?
3
votes
1answer
153 views

What algorithm does QGIS use to calculate Nearest Neighbor Index?

I'm carrying out nearest neighbor analysis on a set of geological features in QGIS, trying to find out whether they're clustered or not. I've calculated the nearest neighbor distances using the ...
1
vote
1answer
34 views

How to quickly change EPSG in QGIS (Openlayers; 4326 vs. 3857)

I'm using Qgis 2.12.2-Lyon on Ubuntu 14.04 LTS. With the OpenLayers plugin I added some OpenLayers to my Canvas. I usually use the WGS 84 (EPSG:4326) projection for my project, but I have to switch ...
0
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1answer
26 views

Error with brush style while working with Qgis2leaf

I am getting following error while working with QGIS2leaf. it saying that QgsSimpleLineSymbolLayerV2' object has no attribute 'brushStyle'. I didn't understand why its coming . Full error what i am ...
1
vote
1answer
41 views

Color gradients to show direction in polylines

I am referring to this very useful hack to change the color gradient of buffered polygons in order to show direction (with a gradient from red to green, for example) hack The only problem is that ...
1
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0answers
36 views

Add a Delimited Text Layer in QGIS [duplicate]

Does anyone know how to put manually decimal coordinates in QGIS 2.12.3 Lyon? I have the georeferenced topographic map. I've tried to add feature point and then change the coordinates of the point but ...
3
votes
2answers
33 views

How to make a line shapefile converted from a gpx track file display over basemaps such as OpenStreetMap?

I have created a line shapefile from a Garmin gpx track file using QGIS 1.12.3 Lyon. Resultant vector file displays properly with other vector shapefiles. Problem is that created vector file (line ...
1
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1answer
28 views

Point in Polygon: Aggregation does not work

I'm working with these data: click here. The task is actually pretty simple but somehow it won't work properly. I have a point and a polygon layer. In most polygons there are a couple of points. The ...
1
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0answers
13 views

Export/print QGis: dismatching OSM data on an OSM-layer

On QGIS (2.10, winXP). is there any known problem by exporting or printing .osm-data (from JOSM) onto an Openstreetmap-Mapnik-layer? The imported waypoints always shift from the left less and less ...
2
votes
1answer
58 views

Concatenate values using spatial join in QGIS?

I have a layer (SQLlite) of city lots and would like to accomplish the following: For each city lot, concatenate the list of unique lot id's which are bound within a radius of 30m from the given ...
4
votes
3answers
18 views

gdalwarp to geographic coordinate system

I'm getting the folllowing Error when trying to re-project a raster from NAD_1983_Albers to GCS_North_American_1983. I used the proj4 defenition from going to Properties in QGIS of the layer whose ...
1
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0answers
19 views

Foreign Key error, creating new splite db?

Attempting to use a plugin in QGIS (midvatten) that utilizes splite. I am attempting to create a db in a different EPSG than the plug in defaults to, im getting "foreign key constraint failed" as my ...
2
votes
1answer
30 views

How to import a digital elevation model in Germany Gauss Krüger from .dat file?

i am very new to qgis. I want to create a hillshade file and also calculate the inclination. The structure of the digital elevation model data looks like this: 5390.0125 5659.9875 251.8 5390.0125 ...
2
votes
0answers
29 views

Buffer for network roads in QGIS [duplicate]

How can I create "buffers" or vector from values ​​from a layer of points, where the "buffers" are "tied" to the streets? Example: A bus station, I would like to create vectors within 100 m range ...
0
votes
2answers
25 views

Isochrones for public transport [on hold]

Is there a way to compute isochrones for public transport while using the plug-ins available in QGIS? Or is there another way for making them? Note: I am not a software engineer which means that some ...
-1
votes
0answers
25 views

QGIS 2.2 - Split line feature at node [on hold]

I've tried several times to split a line by feature and by parts on a node but I haven't got the expected result. What should I do?
1
vote
1answer
22 views

How to add legend in Qgis2Web plugin while exporting maps?

currently i am working with the publishing web maps with the Qgis2web plugin. but i didn't find any kind of legend window or event to add legend. Is there any other source to add Legend?below is ...
1
vote
1answer
24 views

Pattern fill for raster contours in QGIS

How do I fill the area within raster contours with a pattern fill, instead of colors in QGIS? Is this even possible?
0
votes
1answer
19 views

Unable to export map in Qgis2leaf

I am trying to make web map with the help of Qgis2leaf plug in. i added all layer to be plot but when i clicked on OK after setting all parameters i am getting Python coding error. Here i am attaching ...
1
vote
1answer
53 views

Virtual fields are lost when duplicate layers

I've just upgraded to QGIS 2.12.3 - and hoped that the issue which was really time-consuming in 2.12. <3 could have been solved ... On duplicating layer - with tons of joined tables and virtual ...
2
votes
1answer
40 views

QGIS - PYQGIS Import gpx as vector layer

I'm trying to use the python console to import some gpx files as vector layers. When I do it manually I have to choose which layers to add, my options are: I've tried various versions of the code ...
2
votes
1answer
25 views

QGIS: Only view raster data within polygon

So i have this raster dataset in .ASC-format. I defined a bounding box polygon of my study area: Now i want QGIS to only show the raster data within this boundary box without changing/adapting the ...