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

learn more… | top users | synonyms

1
vote
0answers
5 views

Feature Labels wrong with GeoJSON data source

EDIT: I found out that the attribute table changes when zooming, my GeoJSON output does not change however. I am working on a QGIS project where I've imported points as a GeoJSON data source from a ...
0
votes
0answers
12 views

Unsupported Source

If I try to save a raster files from a WMS once saved tells me that the source is not supported, "Data Source not supported: /Users/beatriceluise/Desktop/wms/Senza titolo.tif is a raster data source ...
1
vote
2answers
32 views

How to split a large point vector layer in QGIS?

I need to split my shapefiles into much smaller pieces so that I can upload them onto the Postgis server. Shapefiles have dbfs with 14gb (1,000,000 rows) and I need them to be under 2gb. I've tried ...
1
vote
2answers
25 views

QGIS count how many lines cross a polygon

In QGIS I create some lines that cross three polygons. By using intersection, it will create a new shape file that gives me as a result the lines inside the three polygons. If I open the attribute of ...
1
vote
1answer
33 views

QGIS line cross a polygon

In QGIS I create a line that crosses a polygon twice. By using intersection, it will create a new shape file that gives me as a result two visible lines (the polygon cut the line). With geometry ...
3
votes
2answers
105 views

Automatic numbering of points during digitization in QGIS?

Does somebody know how to automatically number the points during digitization in Qgis. To explain, when I create the new point there is the window where I must to type the point number. Is there any ...
2
votes
0answers
23 views

Semi, third, quarter circle and other compound style symbols in QGIS?

I think I used quarter (and other) circles in QGIS in the past. But it might be as well that it was only in different software. Anyway now I am not able to find in symbols any option for compound ...
0
votes
0answers
25 views

Polylines and polygons - QGIS-2.14.3-1

After extracting contour lines from a DEM (obtaining polylines), and transforming them to polygons, I export the vector layer with polygons to a DXF. Then I import the DXF into Corel Draw to manage ...
0
votes
1answer
21 views

How to access the options of the Label Properties dialog in QGIS2.14.2?

The Change Label tool has a Label Properties dialog but the options are greyed out. How to access them?
1
vote
0answers
16 views

how to show all features visible on map?

i have restored on mssql a backup file and added it on qgis but it shows only some features NOT all features. i want all features to be shown on map.
1
vote
0answers
20 views

Joining polygons to points when the points fall in the intersection of polygons. QGIS

I am using QGIS. I am hoping to join a set of geocoded points to polygons in such a way that the new snapefile will be points that have a new field which lists the attributes of the polygon it lies in ...
1
vote
2answers
25 views

Backup GIS data on postgis database from pgadmin3

I am using a postgis database with qgis and managing it with pgadmin3 I have already investigated the backup/restore options within pgadmin 3 and done one test run on one database I am wondering if ...
1
vote
0answers
11 views

How to avoid QGIS line width scaling when exporting geometry to KML?

I have shapefiles loaded as linear geometries in QGIS. I use the layer properties dialog to apply some styling to them (color + linewidth). The goal is to output each layer as KML file. My problem ...
1
vote
0answers
19 views

Per-pixel Descriptive Statistics through multiple Raster layers

I'm looking for computing different descriptive statistics through a set of raster layers. I need to make it with a python script capable of running into a standalone tool within the QGIS. To do so ...
2
votes
1answer
29 views

Why do labels in exports using HERE tiles appear tiny?

I am trying to export images from the QGIS print composer, the exported image has a basemap that is loaded from an XML file following this questions method. The export doesn't look at all like the ...
1
vote
1answer
14 views

How to “clean up” undesired values in a slope raster

I have a reclassified slope raster with 3 values in band 1. My problem is that I want to polygonize this layer, but the surface is so irregular with a lot of plots in terraces and because of this it ...
1
vote
1answer
25 views

Why the street label is not showing in a feature in QGIS 2.14.2?

Why this street label is not visible even with zoom? It has 'name' in it... Here_qgis2.14.2_file
1
vote
1answer
32 views

Where to use the shp2pgsql commands?

I need to upload some very large tables (over 10Gb) into Postgis so I actually found this link What is the best hack for importing large datasets into PostGIS? The DB manager is far too slow and only ...
0
votes
1answer
25 views

How to edit a table in order to count the number of points in the same location?

Using QGIS, I have a point shapefile that has multiple points with same coordinates across different locations. I need a count of those points. For example there are 15 features that have the exact ...
1
vote
0answers
28 views

QGIS 2.14.3 can't attach oracle spatial table

when I try to attach spatial table in QGIS, the application close without errors. The tables which have problem have a UUID column: mslink NUMBER(10,0) NOT NULL, uuid RAW(16) ...
1
vote
0answers
14 views

Neighborhood analyses with GRASS/QGIS using ASTER GDEM

I have a problem related with this question (Old question without answer: R.Neighbors with large neighborhoods?). Basically, I want to estimate roughness of a given area, for which I was using QGIS, ...
0
votes
1answer
21 views

How to print maps portions one by one in QGIS 2.14.2?

I have a map divided into different regions. Each piece have a number assigned (eg. 27). I have a page configured for printing the region (territory) along with 4 pieces of attribute tables filtered ...
0
votes
0answers
8 views

QGIS 2.14.3 export PostGIS layer to dxf issue

I am trying to export a PostGIS layer to dxf in QGIS (2.14.3) via Project>DXF-Export using the following settings (German GUI): When I open the resulting dxf in DWG TrueView 2016 I see nothing, but ...
2
votes
3answers
78 views

Is there a way of labeling the number of points with the same coordinates?

After reading through the following question (which is kinda related but not quite what I need): How can I show points on the same coordinate as e.g. a bigger symbol in QGIS? I found out that there ...
1
vote
2answers
37 views

QGIS place labels next to the beggining or ending points of Linestrings but above the Linestring

I've got a Linestrings layer. Each Linestring has among other fields, these ones: id ENTRY EXIT 1 S1 E2 2 S1 E3 3 S1 E3 4 S1 E3 5 S1 E3 6 S1 E1 7 ...
0
votes
2answers
25 views

QGIS error in merging large point shapefiles

While trying to merge 2 large point shapefiles using the merge shapefiles tool under the data management. These point files have over 20Gb and have the same coordinate system. Problem is, that the ...
2
votes
3answers
120 views

Sort a table by multiple columns in QGIS

In 2012 the answer was NO! How to sort by multiple fields at the same time? My data is in a SHP file, I want to sort by 3 fields. Has this changed in the last 4 years? == EDIT == A solution like ...
1
vote
1answer
56 views

QGIS show labels in beggining or ending points of Linestrings

I've got a Linestrings layer. Each Linestring has among other fields, these ones: id ENTRY EXIT 1 S1 E2 2 S1 E3 3 S1 E3 4 S1 E3 5 S1 E3 6 S1 E1 7 ...
0
votes
1answer
27 views

Creating grid layer of 2 km sq. and deciding X and Y parameters? [on hold]

How to create a Vector Gird polygon layer and what should put in the X and Y parameters when I would like to create a 2 km sq grid polygon
2
votes
0answers
46 views

Selection by adjacent polygon features

I have a large polygon shapefile with lots of features from a model output, I need to remove anomalous features which are joined by a single vertex and part of a cluster of two. (example highlighted ...
1
vote
1answer
40 views

How to refresh MapCanvas while PyQGIS-script is running?

I try to write a PyQGIS script similar to this: Use of python console to prepare offline map from WMS (tile downloader). Basically there are two loops to pan the mapCanvas, refresh the mapCanvas and ...
1
vote
1answer
49 views

Understanding why extracted contours offset in QGIS?

I am a beginner at QGIS, and I am trying to extract 1m contours from 5m DEM data. I have clipped a small area from the DEM data (roughly 1.2km by 1.2km). When I go to Raster - Extraction - Contour, it ...
2
votes
0answers
27 views

Generating routes between every point in a set of points in QGIS

I'm looking for a way in which to generate a set of routes between every point in a layer. To be clear, if I have four points [A,B,C,D] I want to get routes: A - B A - C A - D B - A B ...
1
vote
0answers
17 views

What is the default directory for qml-files in QGIS?

I'm using QGIS 2.14.1 on Windows.
2
votes
1answer
39 views

How can I add a second Toolbar Button and Dialog to a QGIS plugin built with Plugin Builder?

I want to create a toolbar with 2 buttons, each button opening a different form. The steps I followed are: Created a plugin using Plugin builder Created a toolbar with 2 buttons by doing the ...
1
vote
1answer
40 views

QGIS Autofill Column help?

I'm working on a soil project and I am trying to add a new field that is called Drainage which is correlated to all of the different soil types (which is a different field). Is there an easy way to ...
1
vote
1answer
34 views

QGIS automatic fill columns from referenced csv

I have what is probably quite an easy problem, however I'm not able to figure it out by myself. I work as a field researcher doing bird inventory. I collect the data via QGIS on an android-tablet, ...
2
votes
1answer
31 views

QGIS Python variable not updating after new features are inserted

I have the following script that sets the a feature id automatically after a new feature is digitized. I added the function inside the project's Macro section inside openProject() function: The ...
0
votes
1answer
16 views

How to perform radiometric correction and enhancement processing to get the coastal habitats?

I have a satellite image that is processed to unsupervised classification. I have to get the coastal habitats from this image. The satellite image before classification process need radiometric ...
3
votes
1answer
26 views

QGIS python getting number of new features to be stored in layers

I mean, how could I get the number of features that have been created in a given layer and that are pending to be saved in the layer when "Toggle editing" or "Saving layer edits"?
1
vote
0answers
53 views

Problem aligning historic map of Poland [on hold]

I have downloaded a historic map of Poland. I am having a problem aligning it to a modern map. I have tried various methods and coordinate system using over 50 points, but nothing works. It gets ...
1
vote
0answers
31 views

Create Terrain Ruggedness Index (TRI) in QGIS

I just started to use raster files, and I want to create a Terrain Ruggedness Index (TRI), using QGIS. Which layers must I use? Do I need to create the "Input file (DEM raster)" (in: ...
3
votes
4answers
72 views

How to choose a fixed position to labels in QGIS 2.14.2? [duplicate]

How can I manually position these numbers for a better position in a polygon layer?
2
votes
1answer
23 views

QGIS Error while executing Python function in openProject() Macro: “QgsMapLayerRegistry is not defined”

I have the following script that sets the a feature id automatically after a new feature is digitized. I want the following function to be executed automatically when project is opened (and layers ...
1
vote
1answer
43 views

Creating shapes/lines from geo coordinates in postgis

Following the suggestion from this topic I'm posting my question here. I have a table in postgres/postgis with geo data and I want to show them on map via qgis. Here is the table: city | street ...
1
vote
1answer
22 views

QgsMapCanvas object is not callable (Ubuntu with, Eclipse, Python & QGIS 2.0)

I'm basically borrowing the code for picking up a coordinate from a mouse click from this answer : How to programatically check for a mouse click in QGIS However in a stand alone application I do ...
2
votes
3answers
132 views

How to export shapefiles from QGIS to PostGIS?

The tutorials I've been seeing such as this one https://saarapakarinen.wordpress.com/2015/06/13/tutorial-creating-a-postgis-database-for-qgis-part-2/ They mention a SPIT plugin that I can't find ...
1
vote
1answer
39 views

Colour specific polygons on a postcode map - QGIS

I am working on a UK postcode map. It only has the first bit of the postcode, e.g. BR12. I have an excel spreadsheet with the longitude/latitude of specific points as well as their postcodes. Instead ...
1
vote
2answers
37 views

Show results of ST_Union in QGIS

Currently, I am working on SQL in PostgreSQL and I execute query of vector data by "ST_Union" function for the spatial data. Now, I want to access the result of query in QGIS 2.14, but I can't. Is ...
1
vote
1answer
39 views

CRS with Latitude and Longitude the same way round as Google

I have a set of data with Lat/Lon co-ordinates taken from Google Earth, I've converted the co-ordinates into WKT using a short formula in a spreadsheet, converted to a csv and imported. Unfortunately ...