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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2answers
69 views

Select by expression functions in QGIS 2.8.2 (Windows)?

Please forgive me if this is obvious, but having opened a newly installed version of QGIS on Windows, I can't seem to see the list of functions normally present (as shown in the Mac image) in the ...
1
vote
0answers
24 views

Discrepancy between importing same data from CSV and GPS [closed]

I have been importing similar data by using two different methods: Entering the coordinates manually in excel and save as CSV, then importing in QGIS through delimited text layer. Column A is name, ...
1
vote
1answer
25 views

Merge 2 Pointlayers with same coordinates but different attributes in QGIS?

I have two layers with points who have exactly the same coordinates but different attribute fields. I would like to merge the tow layers so that I only have one point at each location who has the ...
1
vote
1answer
27 views

Projection change in QGIS after import & export in Grass

I'm working on an application written with Grass command in python and I have a projection problem. First I create a location with belgian lambert 72 (EPSG:31370) in Grass 7.0. After importing all ...
3
votes
0answers
87 views

Is it possible to create Isochrones in QGIS GUI?

I'm new to QGIS and have tried to create isochrones around points for quite some time. Is there any option to create isochrones on the GUI in QGIS? I know how to create them using pgAdmin (using eg ...
2
votes
0answers
38 views

How do make ST_Split ready for QGIS?

In my recent QGIS project I need to split polygons (table/layer "pol") by both closed and non-closed linestrings (table/layer "lin"). I've tried the following SQL queries. CREATE VIEW split_pol AS ...
0
votes
1answer
24 views

How to reuse a layout in the QGIS print composer layout on different pages?

I've got a map template that I've created in the QGIS print composer on page 1. It includes various objects like text boxes, images (north arrow), scalebar and legend. I want to use the same template ...
2
votes
1answer
65 views

Is there a way to improve the time for opening a QGIS project?

We have a QGIS project using postgresql database "made with" osm2pgsql. The database is about 68GB. Our Configuration is : AMD-FX 8 cores @ 4.7Ghz 32 Gb RAM 500 Gb SSD (read/write 600Mb/s) Ubuntu ...
1
vote
1answer
38 views

How to control the priority of individual feature labels in one layer?

I have a group of city in a small area with labels. Due to label engine it shows them in a 'random order' (and certainly optimizing) according the space the have. There is a way, without duplicate ...
2
votes
2answers
74 views

What is the easiest way to install a really old Nightly Build of QGIS Master (in Windows)?

I would like to test which nightly build between QGIS 1.8 and 2.0 caused a certain change in QGIS behavior. I know that there are very convenient exe files of weekly builds available on ...
2
votes
1answer
50 views

How do I set up the R Script folder in QGIS 2.8.1 Processing Toolbox (Advanced Interface)?

I am currently lacking the R Script folder in my processing toolbox under the advanced interface tab. I suspect this could be a result of the firewall in my company's wifi. I already have R ...
1
vote
1answer
26 views

Spatialite ST_area(geom) won't compute for GeomObject

I extracted a dataset from Wikimapia via API using .kml download --> ogr2ogr .kml to GML -explodecollections --> GML to .shp only LINESTRING part of geometry collection. Running QSpatiatlie in QGIS, ...
1
vote
2answers
60 views

How to combine/merge *.lul files to shape format?

I got multiple files, say 2500, I never heard about lul files before. anyway I visualised it in QGIS after number of attempt in Autocad map 3d and ArcGIS. it is basically like Basemap:Road,parcels, ...
1
vote
1answer
32 views

How to convert GDA eastings/northings to WGS84 lat/long in QGIS

I'm using QGIS to map weed locations and have a mixture of data from GPS, shape files of contours, OSM all in a project with CRS WGS84 (lat, long). I am trying to add in a shape file I have been given ...
1
vote
1answer
45 views

Can QGIS manage non-spatial PostgreSQL database?

I have a database with a table with plots. This table has spatial field for the area. Also, I have another table with owners. An owner can own some plots, and the there are a "id_owner" field in the ...
1
vote
2answers
60 views

Extracting difference between two massive shapefiles using QGIS?

I have two massive shapefiles and I need to create a difference shapefile output between the two. I have a layer where I have satellite coverage (orange) and then a layer where I have high resolution ...
1
vote
0answers
20 views

Export to shapefile error in QGIS from POSTGIS table

I am attempting to export a postGIS layer to a shapefile in QGIS 2.6.1 Brighton. The table has 244,674 rows. The data displays perfectly well in QGIS but when I attempt to export to shapefile I get ...
0
votes
2answers
52 views

Can QGIS export Geospatial PDF for Avenza PDF map app?

Since QGIS uses GDAL, does any map exported as a PDF become a Geospatial PDF? I am hoping to import maps from QGIS into the Avenza PDF Map app on my phone. Previous posts mentioned exporting as ...
1
vote
1answer
61 views

Why did I lose the processing menu in QGIS 2.8?

I'm sure there is a really simple explanation to this but haven't found any pointers on this forum or elsewhere. I seem to have lost the 'processing' menu from QGIS and can't figure out how/why!? Any ...
3
votes
1answer
53 views

How to create multiple QGIS layers from multiple text files?

I have a few hundred txt files (each representing a line of a river bed profile) that I need to load as (point-) layers in QGIS. Partial example: 4504764.8331;5374251.3024;397.8871;2 ...
1
vote
1answer
42 views

QGIS problem calculating area

I have a problem with qgis 2.8.1 (Wien). Whenever I change the project SRC to WGS84-World Mercator (EPSG 3395), the area is calculated as zero. How can I solve this problem? Is this a known bug? The ...
0
votes
2answers
83 views

How to automate specific workflow best (QGIS 2.8)?

For a project of mine, I'd like to solve a spatial analysis using QGIS. Until now, I have never automated anything GIS-related except for some rather easy steps in ArcGIS using the model builder, so ...
1
vote
2answers
27 views

add polygon to layer from text file [closed]

I am completely new to Qgis and to gis in general. I have start to work my way through the documentation but have a question that I can not find a answer to. When looking into the documentation ...
1
vote
1answer
51 views

How to round pixel values of a raster in QGIS?

I have a raster with float number values for example: 2.544459104537964 and I want to round these up to intergers. I have seen other posts on ArcGIS like this one but when I use Raster Calculator in ...
0
votes
1answer
49 views

QGIS downsample then upsample raster

I'm trying to downsample a raster then upsample it again. I am using the gdalwarp function in QGIS. When downsampling the raster looks OK in the front end, I set the cell size to 10x the original ...
1
vote
0answers
20 views

distance() function in field calculator gives unexpected results

I have two layers both containing points - each point in the first layer has a corresponding point in the second layer (same primary key). One layer has CRS EPSG:27700 and the other layer has ...
2
votes
0answers
34 views

QGIS: Not updating the row number properly. Attributing the last created point with “1” & vice versa

We have to capture the sample points in survey maps. While doing so, we are facing a peculiar problem. Our survey points start from left to right <- along the survey lines. Once we have captured ...
1
vote
1answer
16 views

QGIS Scalebar Font Outline

Is there a way to add a text buffer or stroke the text on the scale bar? Its impossible to read the scale when its set on a map with dark colours.
1
vote
2answers
35 views

How to update a bulk selection of fields using field calculator in QGIS 2.8.1

I have an attribute table showing vegetation communities. The table has three columns ("ID", "Veg Comm" and "Area_ha". Instead of having to copy and paste text after each polygon created into each ...
2
votes
1answer
60 views

Can't import certain tables from SQL Server to QGIS

This is a list of 193 zip codes and their geometries that do not import in QGIS. This is a list of 999 Census Block Groups and their geometries that do import in QGIS. This is the Add MSSQL Layer ...
1
vote
1answer
53 views

How to have newly added lines split existing lines where they intersect, using QGIS

I have a line shapefile where the lines form a closed polygon. Using QGIS (2.8 on OSX 10.7) I would like to add lines to the layer, basically splitting the polygon into quadrants. Then, I will need ...
1
vote
1answer
29 views

Why can't I paste coordinates in “Enter Map Coordinates”?

Using QGIS 2.6.1-Brighton, I am attempting to use the Georeferencer. My data is from NGS datasheets. I copied and pasted the data into a text document. In the "Enter Map Coordinates" dialogue, when I ...
1
vote
1answer
29 views

Why slope tiff image produced with QGIS does not show properly in paint?

So I have this slope tiff image that I created using a DEM reprojected in meters. When I view it in QGIS, it shows fine. If I try to edit the picture in paint or Gimp afterwards, I dont see the same ...
1
vote
1answer
39 views

QGIS crash when using args=0 with qgsfunction

I am trying to define a custom function in QGIS 2.8.1 that takes no arguments. from qgis.core import * from qgis.gui import * @qgsfunction(args=0, group='Custom') def test(value1, feature, parent): ...
1
vote
1answer
43 views

Plugin Red layer can not active in QGIS ver.2.8.1

I am trying to use the new plugin Red Layer, I have installed it in QGIS ver. 2.81. I can open the menu but it is not active. How do I enable it?
3
votes
1answer
43 views

How to divide an SHP entity?

I want to divide a unique entity of SHP to multiple entities The picture bellow shows a selected entity with area = 993ha My objective is to divide this entity to multiple entities where each area is ...
0
votes
0answers
32 views

Rototranslation + scale of pdf and dxf with USER CRS in QGIS? [duplicate]

i have a map PDF or DXF to georeferenced with only rototranslation + scaling. I use EPSG: 32632, also the map that I need to import is a survey (maxmimal dimension 5000 m x 5000 m), but his coordinate ...
1
vote
1answer
23 views

Adding non geographic data from MSSQL Database to QGIS?

In QGIS (2.8) I am trying to add non-geometric data / flat data that originates in a MS SQL database. This flat data later should be joined with other layers etc. Connecting to the specific database ...
1
vote
2answers
82 views

Making an overview with linked detailed maps in QGIS 2.8?

i want to create 4-5 detailed maps, and then an overview map that has rectangles that markes the locations of the detailed maps. Best case would be if the rectangles were links to the detailed map. ...
0
votes
1answer
57 views

Heat Map not showing up QGIS [duplicate]

I'm fairly new to QGIS and I'm trying to use Heatmap. I should be doing every thing correct. But when I click OK for it to generate a heatmap, there is no Heatmap at all (nothing changes). For the ...
1
vote
1answer
41 views

Advanced Digitizing Tools Crashing in QGIS 2.8.1 x64 on Ubuntu 14.04

I'm hoping someone here can tell me what I'm doing wrong... Whenever I use the Advanced Digitizing tools in QGIS, I crash after about 5 clicks. I'm even doing it without OTF transformations on. Any ...
0
votes
0answers
20 views

Export color map description from ArcMap to QGIS?

Concerning raster dataset color maps: Is there a way to convert the Raster Function Template XML: .rft.xml used by ArcMap to describe color maps for raster data into the .txt format used by QGIS?
2
votes
1answer
53 views

Importing CSV file with csvt data in QGIS (2.8) will not assign type “date” to fields

I have a dataset (in CSV) and am trying to add several fields with date information, so I can filter points based on this data and generate maps (in QGIS 2.8) which will form a chronological series. ...
0
votes
0answers
22 views

How to properly import georeferenced .dxf hatches/polygons into QGIS?

I have a georeferenced AutoCAD-drawing (some district borders I vectorized with Illustrator from a raster image), saved as a 2004 ASCII .dxf-file. When I import the file in QGIS ("Add Vector Layer"), ...
2
votes
2answers
69 views

How to retrieve start and end points for each line in line shapefile?

I have a vector(polyline) shapefile and I need to retrieve each line´s start and end points(nodes) and create a shapefile with these points. Then I need to add to the polyline´s attribute table the ...
1
vote
0answers
18 views

Routing through bottlenecks

I have two races in the same town that make use of the same stretches of roads/paths in places (sometimes in the same direction, sometimes in opposing directions). Given that I know the pace of the ...
0
votes
0answers
38 views

Coordinates heat map results are not the same as the shapefile [duplicate]

I have done with a heat map shapefiles as shown below. But the results of heat map coordinates are not the same as the coordinates of shapefiles. Is there a procedure that is wrong?
1
vote
0answers
31 views

How to create a real size buffer around a point in qgis

I have a postgis pointlayer in EPSG:3857, added to a project that is set up with OTF ON to project everything (other layers) to EPSG:3857. In postgis, I defined a view to dynamically create a buffer ...
1
vote
1answer
41 views

Is it possible to label places using local fonts like Singhala and Tamil fonts in Arcmap or QGIS?

I downloaded the Keyman desktop for the local keyboard/fonts. I would like to encode location names using Tamil/Singhala fonts in the attribute table and then use it to label the map. However, after ...
1
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0answers
17 views

I can't print a map with QGIS 2.8.1 and Mac OS X

I'm using Mac OS X 10.7.5 and QGis 2.8.1. I want to print a map with Print Composer. But the Buttons "Print" or "Export as PDF" don't work for me. If I use these buttons, the window for choosing a ...