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

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7 views

Wrong shape display with North_Pole_Azimuthal_Equidistant projection

I need to create a map that displays the breeding and wintering ground of a bird species that has a circular arctic breeding distribution and winters in Africa. The map should lool pretty much like ...
1
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0answers
6 views

How to Avoid that Label Covers Icon?

I'm trying to render both house numbers and icons for sirens on a map in QGIS. Now I have added two layers with siren nodes and building outlines, the siren layer being above the buildings. In the ...
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0answers
13 views

Can QGIS 2.8 (Wien) export to Mapserver?

I've tried to export with RT Mapserver Export but it hasn't worked. I'm running QGIS 2.8.6 on W7 x64.
4
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0answers
30 views

QGIS/OGR shp to tab export - crashing Mapinfo due to number format issues

I created a vector grid in QGIS and it exports as SHP -no issues. When I save as tab and try to open the file in MapInfo it crashes. According to ...
2
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1answer
21 views

Paste a feature from an existing shapefile into a row with null geometry in QGIS

If I have an existing row in my PostGIS database with NULL geometry, is it possible to select a feature from another layer in QGIS, and paste that into the empty geometry column for the PostGIS row?
2
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1answer
52 views

Strange names of swedish cities [duplicate]

I got a GIS Data-set for swedish cities. The problem is that they have strange names such as: Trädet Jäla Mjönäs Älmhult Did someone have the samoe problems? I think "ö" for instance mean ...
1
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1answer
23 views

QGIS: Buffer around external border of a country based on federal state borders

based on the question "QGIS: several layers - query" I have an additional question: With "join attributes by location" I got a layer that constist of the city names with the corresponding ferdale ...
2
votes
1answer
24 views

Unexpected behaviour using ST_Equals() with QGIS

Let's say there is a table 'polygon_a' and a table 'polygon_b'. Each table contains three polygon features. The polygon features are spatially equal. CREATE TABLE polygon_a ( gid serial NOT NULL, ...
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2answers
34 views

How to add state polygon information to a city point?

I have the following layers: Country border federal state borders cities (located as points) I would need the following result file (txt or csv..): A column with the name of the city and another ...
2
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0answers
8 views

QGIS graphical modeler: how to automatically enter parameters in r.drain.coordinate tool

i am carrying out a cost least path analysis and i am using QGIS. The processing tools i am using are: r.cost.full and then r.drain.coordinate Considering i have more than 1000 layer to process ...
3
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0answers
25 views

qgis2web problem with lots of data

A few month ago I was able to make a polygon map of population: http://supermap.hostei.com Today I opened the same QGIS project and tried qgis2web again. The plugin interface had responding ...
5
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3answers
150 views

How to select specific rows of polygons from a grid in QGIS?

I have a polygon layer. I would like to select every second row of the polygons but not manually. Is there an expression to select every second row as seen on the picture with Select by expression in ...
1
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0answers
29 views

Problem in polygon division using the union tool from QGIS

I am trying to overlay two polygon layers using the union tool from QGIS, to then compute the areas from the resulting polygons. However, in the resulting layer some polygons are not divided as ...
4
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0answers
17 views

Thematic map exported using QGIS2Web is extremely laggy

I have made a world thematic map and added layers of data for creating graduated color scheme on the country level. I need a interactive map as an output which shows values when user hover over any ...
4
votes
1answer
62 views

Problem Editing a Vector Layer QGIS

I have a vector layer which I need to load and edit (add several attribute columns). I am doing this without opening QGIS, so within a python script. I have the following piece of code for the layer ...
2
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0answers
24 views

Write userID to field automatically every time an object is edited

Currently every user has to put his/her useriD in a field after every change made to an object in the database. This takes time and can be forgotten easily. Is there a SQL-Command giving back the ...
0
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0answers
8 views

Open Street Map Base Map on QField

I am using QField on an Android tablet, I would like to know if I could use a web mapping service like open street map as a base map. Without having the actual file stored on the tablet?
3
votes
2answers
122 views

How to create in QGIS shapefile a field that automatically returns the current date

I'm digitizing a shapefile in QGIS and I need to create a field that returns automatically the current date.
1
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1answer
15 views

Is there a possibility to simply display the next element on a layer?

I have to check all the elements on a layer and I'm looking for an easy way to go through all of them. One option would be to open the attribute table and just always click on the next line and then ...
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0answers
19 views

Python error when using r.reclass on raster with no CRS

I have a set of GRID data (directory of .adf files) that I'm trying to reclassify in QGIS. I'm using the GRASS r.reclass function to try to reclassify the layers, but GRASS keeps failing and ...
2
votes
1answer
15 views

Creating groups containing slopes of a specific range

I have a basic knowledge of QGIS and can do everything I need to do to achieve my requirements except the following. I'm trying to graphically show areas of land that contain a set of specific slope ...
1
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2answers
34 views

Enabling preview in QGIS recent projects?

after installing qgis on win 10 I am missing the map-preview in the recent projects window as I had under win7(see screenshot). where is the setting to enable this?
3
votes
1answer
52 views

Which is better for measuring actual ground elevation, NED or SRTM?

I know that NED DEM layers are created using mainly Lidar point clouds and that the SRTM derives its data from shuttle-based radar. I have both of these loaded into QGIS and can see that over my study ...
4
votes
2answers
37 views

Retrieve available PostGIS connections in PyQGIS

Can I retrieve the available connections to PostGIS databases in PyQGIS? I would like to provide a list of available db-connections, and subsequently a list of tables within the ui of my plugin. I ...
0
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0answers
22 views

Calculate obstacle accountability area in QGIS

Still being new to the whole GIS world, I am trying to calculate a regulatory takeoff obstacle accountability area for a given runway. For my case, this is defined as an area as follows. At the start ...
2
votes
1answer
55 views

How to create a shapefile from xy in .csv file?

I find many difficult to create a new shapefile in a new project following those steps. I think the .csv file is correct (there are only: ID, X coord, Y coord) but when I would create the shapefile ...
2
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0answers
22 views

Qgis slow on loading project

Is there any work around to mitigate the amount of time QGIS takes when loading projects that have large tables from postgis layers . I have tried to turn off this large layers so they are not in use ...
1
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1answer
41 views

QGIS Shapefile edited by multiple users

I have a Vector layer containing 36000+ line Objects with a large number of attributes that is currently saved as Shapefile on a server (local network). Multiple users access and edit this Layer ...
3
votes
1answer
50 views

Update column in .shp from .tab with QGIS

Is it possible to perform in QGIS an "update column" on a .shp table with data from a MapInfo.tab having one field apparently in common? One of the greatest uses of QGIS (for me) is the availability ...
1
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1answer
17 views

Raster update error when saving heatmap in QGIS

I am using QGIS and I recently added a delimited layer and all my coordinates appear fine , however when I add a heatmap I get the error "Raster update error: Could not open the created raster for ...
2
votes
2answers
46 views

Icon for plugins in own repository

Does anyone know if there is an opportunity to add icons for your own plug-in in its own repository? like this not like this with green puzzle other illustration I spied on how to implement ...
1
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1answer
33 views

Is there a way to create a presence/absence matrix of polygons per cell in a grid using qGIS?

I'm working in QGIS with species distribution polygons and I want to know how many cells in a grid does the polygon overlap. I've tried creating random points within the polygon and then used ...
2
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0answers
27 views

Qgis becomes unresponsive when adding vector layers

Qgis suddenly won't allow addition of vector layers when running on PC (Lyon 2.12.1). I've reinstalled it, no help. I've recently changed to Windows 10 from 7, otherwise nothing much has changed on ...
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1answer
38 views

Style file with QGIS

I created a very good symbol layout for a current map. I will be creating similar maps just different regions and want to keep the symbols and markers that way they are. The new data will have same ...
1
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2answers
31 views

How to calculate area in sq m - troubleshooting projection issues in a global dataset in QGIS

I am using QGIS version 2.12.3. I have 3 polygon shapefiles: A, B and the intersect of A and B, which we can call C. All I want is to add a field to the attributes table of each shapefile giving ...
2
votes
1answer
44 views

snapping line nodes to points

I have a dataset of manholes and pipes; I want to snap the lines start and end nodes to the manholes if they are within a specified distance. Been trying to find away to do this using PostGIS or QGIS ...
2
votes
2answers
29 views

How can I handle NULL values in a color ramp? [duplicate]

I'm mapping areas in QGIS 2.12 based on average pricing, using area polygons (PostGIS) joined with a CSV data table that doesn't have values for areas that didn't have any sales. I'd like to color ...
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votes
1answer
24 views

Locating and adding state layers to a QGIS map.

If I wanted to add layers for a state (Indiana) in a program like QGIS so I could produce several maps (Infrastructure, Water Resources, Mineral Resources, and HAZMAT concerns), how would I locate and ...
2
votes
1answer
37 views

Get the same coordinates for points after downloading a .osm file

I downloaded a .kml file that contains bike stations which I know the coordinates (latitude and longitude). So I got a layer that contains points corresponding to the stations. Then I downloaded the ...
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0answers
15 views

How to select within a distance using QGIS [duplicate]

With QGIS 2.12.3, I have two projected EPSG:2927 point shapefiles, A and B. I would like to create a selection of A points that are within 100 meters of any B point. This is easy in Arc, using the ...
2
votes
1answer
27 views

QGIS Atlas pages with different raster base layers?

Is it possible to enable raster layers only for specific Atlas pages, without using multiple map Windows? Unfortunately, there is no way to set transparency of raster layers by an expression ...
3
votes
1answer
24 views

Excel Tables as Labels or Annotations

I would like to take excel tables and place them in a label or annotation so that I no longer have to copy and paste them into the figure layout as picture objects. I know this isn't possible in ...
1
vote
1answer
17 views

Error when using viewshed analyis plugin with merged shapefile

I am using Qgis 2.12Lyon and try to run a viewshed analysis to show the intervisibility between several points in more than one shapefile. I have a digital elevation model (.tif) which is projected ...
0
votes
0answers
8 views

QGIS Server - I can't update QGIS layers that don't have a geometry field via WFS

I am using some layers that are data only (no geometry field). These tables are related to other geometric layers, as you can see in the config below : When trying to publish in WFS these "no ...
1
vote
2answers
36 views

How to turn a point layer into classified proportional circles in QGIS 2.12?

I'm trying to style a point layer representing cities around the Mediterranean following these two rules : The points should be represented as proportional circles, following a classification in 5 ...
0
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0answers
17 views

Looking for real examples of using GIS in logistics and transport systems (maritime, auto, rail) [on hold]

As mentioned in title I'm looking for real examples of using GIS in logistics and transport systems. To be specific I'm trying to find any articles or books with detailed explanation of achieved goal ...
1
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0answers
21 views

How to get a multi-attributes vector from an SRTM raster in QGIS?

I split an SRTM raster into 3 different raster files representing the altitude, the slope and the exposure, using QGIS DEM analysis tools. How can I output a single vector file with the 3 attributes ...
3
votes
1answer
42 views

How to create a fishnet/grid along a polyline or polygon

I am trying to generate a fishnet/grid along a line/polyline or polygon boundary in ArcGis 10.3 or QGIS. While it is totally intuitive and easy to generate a box-standard grid, what I am trying to do ...
1
vote
1answer
42 views

QGIS: getting NULL values when using “Join Attributes by Location” of lines and polygons

I'm using QGIS 2.12.3-Lyon. I have a polygon layer (~130k square polygons with some small overlaps) and I have imported a road network from OpenStreetMap (via Geofabrik, ~141k road segments) for my ...
2
votes
0answers
34 views

How to select a WMS layer style in QGIS

WMS standard allows specifying a list of styles for each WMS layer. The users can then use the style name in the URL query parameter "STYLES". If the styles are not specified, "default" is assumed. ...