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

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14 views

QGIS to tilemill export

does anyone know if there is a way to save a QGIS project in a manner that allows it or if there is a way to save a qgis project as mbtiles for use with mapbox
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0answers
4 views

Extracting zeros from numpy array and creating a new raster

The following code reads in several .tif files from an input folder, converts them to numpy arrays and adds them together. All input files are binary: inputFolder = "/home/usr/Desktop/BufferFolder/" ...
0
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0answers
13 views

Rendering layer properties consistently in Print Composer in QGIS

I have created a layer of lat-long coordinates in the map I am working with that. On the map, I can appropriately size the "simple marker" representing each point for a given zoom. However, when I ...
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0answers
42 views

Can anyone suggest me interesting projects using gis software- advanced? [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. ...
2
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1answer
72 views

Concatenate or group by 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 ...
1
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1answer
23 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 ...
8
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1answer
128 views

Simplify repetitive tasks in QGIS Graphical Modeler

Are there iterators that can be used in QGIS graphical modeler to simplify the model shown above. If not, is there any better way of simplifying the model? The first column represents my input ...
3
votes
1answer
214 views

Is there a decent algorithm in QGIS Process Modeller to create a grid?

I am using Process Modeller to automate merging several vector layers and then creating a grid to cover the extent of the merged layer. There are functions which already exist which are not listed in ...
12
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2answers
4k views

How to concatenate labels in QGIS?

I'm using QGIS 1.8 on windows XP machine and I try to do a concatenation of several fields to label the names of my local roads in the attribute table, but I can not find the correct syntax. The first ...
7
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1answer
115 views

Join by attribute / spatialite with SQL / left outer join in QGIS

I have a layer with polygons (let's call it "woods") that is intersected by "n" line-objects ("roads"). Every road has an unique attribute roadid. I need to add ALL the roadid's (not only the first ...
0
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0answers
10 views

How to match the colors of different RGB mosaic rasters?

I am beginner in QGIS. I want to classify many RGB rasters (see picture) but their colors don´t match. As you can see, the green polygon shows the same land cover class (meadow) but in each tile the ...
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1answer
21 views

QGIS Composer value based on http request param

is it possible to set value in QGIS Print Composer based on HTTP request param? For example i want to add table in composer with something like "value = $requestedvalue", and $requested value should ...
2
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1answer
20 views

QGIS Server sending UPDATE… WHERE NULL to postgis in a WFS layer

I am running a Windows Server 2012 server. PostgreSQL 9.3.5, 64-bit POSTGIS 2.1.3 QGIS Server 2.6.1-2 QGIS Desktop 2.8.3 and 2.12 I am using a Microsoft Surface Pro 4 tablet using QGIS Desktop ...
2
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2answers
48 views

Separate different zones from one attribute in QGIS?

I am new with QGIS and I use QGIS 2.12.3 Lyon. I downloaded from an official web side the protected water areas. Those areas are separated in different zones (for example zone I, zone II and zone ...
2
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2answers
34 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 ...
0
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1answer
24 views

Contour extraction from raster does not finish in Qgis. How to find out if a raster is damaged

Execution of "extraction" - "contours" in Qgis is impossible. The process never finishes, I stopped it after 35 min. The contour extraction works for all other raster files. I have tried with ...
2
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1answer
57 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 ...
1
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1answer
17 views

Importing Several Raster Layers, Doing Manipulations and Exporting The Newly Saved Rasters

I have the following code: src_ds = gdal.Open("/home/usr/Desktop/RasterFolder/Name.tif") if src_ds is None: print 'Unable to open %s' % src_filename sys.exit(1) myarray = ...
4
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1answer
42 views

Need to combine the lines created by Vector grid in QGIS into one polyline

I am having a fairly specific issue. I am starting off by creating 100m2 squares around specific points on a map by adding a buffer to the point and then using this buffer as the extent for a Vector ...
0
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0answers
4 views

How to translate units to pixels for symbology rendering in Mapnik?

I would like to translate .QML-file to Mapnik .XML to render layer via Mapnik using the same style that is created for QGIS. The problem is that sizes and offsets on QGIS are defined in millimeters or ...
2
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0answers
39 views

Button to run Python Script on Custom Form Open QGIS

I'm very new to QGIS and Python (although years ago had some programming experience with C++), but have been muddling through with a fairly large project cataloging cemetery plots at the moment. I ...
4
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1answer
55 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: ...
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0answers
24 views

GIS and RS reports auto-generation [on hold]

I need an open source tool package /Plugin for auto generation an interactive GIS and RS reports using a predefined templates. What can you recommend?
1
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1answer
16 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. ...
3
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2answers
402 views

Map formats supported by QGIS

May i know whether QGIS supports the following map formats? (1) S-57 Electronic Navigation Charts (Naval Maps) (2) Army/IAF Maps in DGN (3) DTEDO0, DTEDO1 and DTEDO2 (4) GeoTIFF (5) DTED
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0answers
17 views

Loading GML schema file on QGIS

I am Very New to GML format. first of all, I have came to the assumption that a schema file will display gml in a particular style as defined by the schema, similar to the way i load a .qml on a ...
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0answers
17 views

QGIS and GRASS 7 integration [duplicate]

I want to integrate QGIS 2.12.3 or 2.13 with GRASS 7, but I still haven't been able to do so. Can someone please tell me how can I do this with a stable QGIS version.
1
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1answer
223 views

How to apply new WFS-Filter features like intersect

I was pleasantly surprised to find very much enlarged filter support in QGIS-Dev (1.9.0_Master). One application would be a WFS-Filter which combines $geometry and Intersect in order to load only the ...
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1answer
14 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
votes
1answer
225 views

Python Error while installing Cartogram

I am quite new to GIS and qGIS especially. I would like to install cfarmers cartogram plugin. From what I understand, this has to be done manually - so I 've followed the instructions from ...
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0answers
14 views
5
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1answer
80 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
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0answers
21 views

Singlepart to multipart not producing results [on hold]

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
17 views

In QGIS add new attribute table features from updated csv [duplicate]

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 ...
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0answers
151 views

Is there an easier way to refresh a joined CSV?

I'm working with data that gets updated sporadically. Essentially, I have a CSV which defines which postal codes belong to certain sales reps, and these postal codes might shift around. I made ...
2
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3answers
55 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 ...
1
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2answers
83 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 ...
2
votes
1answer
37 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
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1answer
53 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 ...
18
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2answers
17k views

How to reproject a vector layer in QGIS?

I have some shape file which is in UTM. I wanted them to convert to Decimal Degrees in QGIS.
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0answers
13 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, ...
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0answers
18 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 ...
3
votes
1answer
20 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
vote
1answer
24 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
25 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. ...
1
vote
1answer
39 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 ...
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0answers
37 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 ?
3
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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 ...
11
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3answers
1k views

Ortho Projection produces artifacts

I`m trying to create a sphere-like view using qgis and the "world from space"-projection http://spatialreference.org/ref/sr-org/6980/ (essentialy an ortho-projection). ArcGIS wraps the shapes ...
4
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2answers
216 views

Where to find Documentation for developing QGIS Plugins?

I thought I would try to write a plugin for QGIS (some Python code that I hoped I could easily port) I started following http://www.qgisworkshop.org/html/workshop/plugins_tutorial.html but that turned ...