Questions tagged [qgis]

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

Filter by
Sorted by
Tagged with
1
vote
2answers
731 views

How can I import open street map power grid data into QGIS?

I wanted to download power grid network of Cologne city from following url http://www.flosm.de/en/Power-Grid.html But I could only download in jpg format. I wanted to import this in GIS as vector (*....
1
vote
0answers
350 views

How to create contours from an IDW raster

I'm new to QGIS and am trying to create vector contours from this IDW raster. I followed Ujaval Gandhi's "Interpolating Point Data" tutorial step by step but am not getting the same results for step ...
1
vote
1answer
1k views

QGIS Semi-automatic classification plugin install error on OS X 10.10: matplotlib.backends.backend_qt4agg

I have tried repeatedly to install the QGIS Semi-automatic classification plugin via both (1) Plugins > Install & Manage Plugins and (2) manually based on other comments I found here, but I can'...
1
vote
2answers
371 views

Interpolate dxf polyline vertex elevation from DTM?

I am working on several autocad polylines (with several vertices...) that have the exact N,E coords but now I would like to add the elevation data for every polyline's vertices from a dtm. I thought ...
1
vote
1answer
2k views

“Easy Custom Labeling” arrows: How do I get them?

I have installed the Easy Custom Labeling plugin, but haven't figured out how to make the "Generate lines" function work. When I click on the tool in the toolbar, it opens the dialogue to specify my ...
1
vote
1answer
382 views

Remove cell boundaries of raster pixels converted to vector format

I have a solar radiation shapefile with 10 km x 10 km cells. When I put it on QGIS, many pixels with boundaries take place. Please see the following image: How can I remove them in Qgis?
1
vote
5answers
7k views

Solutions for uploading maps to GPS (forestry maps: roads, trails, hydro, polygons)?

I'm using a QGIS 2.2.0 Valmiera on a Windows 8.1 system Desktop. I'm a forester and I would like to have a cheap solution to load maps into the handheld Garmin 60, 62 or 64 series GPS. Free would be ...
1
vote
2answers
2k views

export to GeoJSON coordinates in the reverse order

This question has been asked before, but I don't understand how to use the answer given by cengel. I want to make a GeoJSON file with lat long coords, not the default of long lat coords. I have a ...
1
vote
1answer
946 views

QGIS - select or export point attributes by polygon feature

I have two layers, one polygons of boundaries (similar to say local government areas) and a point layer of hospitals. I want to select all of the hospitals within a particular area (ie a particular ...
1
vote
0answers
228 views

QGIS symbology to ESRI

Does anybody know how to export the layer symbology from QGIS into a format that can be used by with ESRI products? I have been successful in exporting an XML but it quotes the file type as: !DOCTYPE ...
1
vote
4answers
6k views

How to connect the selectionChanged signal with pyqt?

I am developing a plugin for QGIS in Python, I need to connect the sselectionChanged signal emitted when a feature of the layer is selected, I could not find any examples on internet, here is what I ...
1
vote
1answer
251 views

How to count number of stores per company per region?

I have two layers. One point layer and a Polygon layer. It is simple to count the points in the polygon layer by the "points in polygon" function. But I also need some more information of the point ...
1
vote
1answer
1k views

Writing result of PyQGIS to shapefile

I try to perform some zonal statistics on a shape- and rasterfile and write the output to a completely new shapefile! import sys # where is the module sys.path.append("/Applications/QGIS.app/Contents/...
1
vote
1answer
3k views

QGIS, CRSs and metric measurements of distance matrix and nearest neighbour? [closed]

I have thousands of points on a multiple layers and I need to get the distances between each point and every other point within a layer (so i can get min, max, mean and median distances) and the ...
1
vote
2answers
1k views

How to snap polygons to lines?

How can I snap a polygon to a line? For example, I have a polygon which represents some meadows to snap over a line which represents a road.
1
vote
1answer
924 views

Looking for PyQGIS Syntax Examples/Guide

I am a long-time user of arcgis with intermediate experience python scripting for automation of geoprocessing workflows. I am moving towards using QGIS on the regular and I would like to dive into ...
1
vote
2answers
685 views

Rasters loaded in Postgres/PostGIS using raster2pgsql contain blank lines

I recently set up an Ubuntu Server as a Postgres/PostGIS database server. In an effort to serve a collection of aerial photos to my colleagues, I loaded 608 GeoTiffs (non-overlapping 1km tiles each ~...
1
vote
3answers
8k views

What do I need to change to get scale bar units other than degrees?

Measurements done in QGIS on my project are done properly using whatever unit is set in: Settings > Options > Map Tools > Preferred measurements units but the scale bar decoration and scale bar in ...
1
vote
1answer
365 views

Can't define Custom CRS in QGIS

1) I tried to define a custom CRS in QGIS without success. I fill all fields and try to change project CRS. (all parameters is good) But I can't find custom CRS in list. I think that this is due to ...
1
vote
0answers
1k views

Error installing Photo2Shape QGIS 2.6 for Mac

I am trying to install the Photo2Shape plugin for QGIS on a Mac (10.9 Mavericks) but I am getting the following error: The plugin is broken. Python said: No module named exifread I have installed ...
1
vote
2answers
874 views

qgis-bin.exe has stopped working [closed]

Working with a big (400mb) project with 25 esri shapefiles and a lot of layouting makes QGIS crash with 30min - 1hr intervals. Crashes usually happens when rendering data, and now ALWAYS when trying ...
1
vote
1answer
214 views

Orphan road segments in QGIS?

I am working with OSM road data for a developing nation. Included in the dataset are various small networks of roads that are orphans or islands i.e. not connected to the main road network. For ...
1
vote
1answer
658 views

SSL error message using MMQGIS and Google Geocoding API

I have a large batch of about 9000 addresses that require geocoding. I've read most of the documentation, and have sectioned my data into chunks of 1000 to geocode using QGIS's MMQGIS Plugin. I also ...
1
vote
2answers
709 views

Resampling raster based on mask raster?

I want to resample rasters of e.g. 2 m resolution to the same raster cell size and projection of an existing raster (25 m). However I cannot really find answers how to do it properly. I managed to ...
1
vote
1answer
465 views

Upgrade matplotlib used within QGIS

I'm using the Python Console within QGIS 2.14.3 (MacOS). When I import matplotlib, it imports version 1.4.3 from '/Library/Python/2.7/site-packages/matplotlib-override/matplotlib/init.pyc'. I would ...
1
vote
1answer
376 views

Topology in QGIS shapefile, GRASS and v.clean (nested polygons)

Following this: Nested polygons in QGIS overlap and don't show the real colour gradient I applied the GRASS function v.clean -> break as suggested by @ahmadhanb and the shapefile now shows ...
1
vote
1answer
130 views

Computing shortest distance to line segment from set of points using QGIS?

I have a shapefile that describes the urban boundaries of a city and I want to calculate for a set of points the nearest distance to the boundary. Given the number of points is very large (millions) I ...
1
vote
1answer
127 views

No output of simple intersection in QGIS / Shapely

I have three simple geometries (download): 1) Province boundaries of a province in Egypt (Al Wadi Al Jadid). 2) A 10 x 10 degree polygon (index = 417). 3) another 10 x 10 degree polygon (index = 416)....
1
vote
1answer
1k views

Oriented minimum bounding box tool missing from QGIS processing toolbox?

I am working with QGIS 2.14.9 and I have realized that some processes are missing. For example, the Oriented Minimum Bounding Box (OMBB) tool is missing in QGIS vector general tools. It was the same ...
1
vote
2answers
283 views

Comparing string in one column to some others using QGIS?

I'm trying to write an expression which will return a TRUE or 1 type result if the string in "column3" is the same as the string in either "column2" or "column1". I've tried "column3" IN ("column2","...
1
vote
2answers
160 views

GRASS v.net.iso tool produces empty output - QGIS 3.2.2

I want to split a network shapefile by cost isolines. I have two layers a point layer (with 297 records) a road network layer Every time I run the GRASS v.net.iso module in QGIS 3.2.2 on the road ...
1
vote
1answer
426 views

QGIS does not recognize Arc-created shapefile CRS

I create a new point shapefile in QGIS (2.12) with EPSG:2927. When I view the Layer's Properties, the CRS is correctly listed as EPSG:2927. Happy! I then create a second point shapefile in Arc ...
1
vote
1answer
130 views

How to see the 'example provider' in processing toolbox of QGIS?

I would like to create my own provider with the processing toolbox. I see the example provider in my folder C:\QgisWien\bin...\algs\ExampleProvider. It seems to be a good start but unfortunately, I ...
1
vote
0answers
333 views

Shapefiles not editable anymore?

From this morning if I open a qgis project all the shapefiles are not editable anymore. I've tried different projects in both 2.14 and 2.16 qgis versions. Has anyone encountered the same problem?
1
vote
1answer
357 views

QGIS 3.2 problem with Python console

I have QGIS Desktop 3.2.2 software already installed. When I open up the program I get the following error: Plugin processing: The plugin will be disabled because it crashed QGIS during last startup. ...
1
vote
2answers
2k views

How to convert a shapefile from bessel1841 to WGS84?

I would like to convert a shapefile which has +ellps=bessel to +ellps=WGS. In my understanding, even QGIS 1.8.0, it is impossible. Let me know the free software which is able to convert shapefile ...
1
vote
0answers
680 views

Use QuantumGIS to bulk-import csv files

I have a large set of .csv-files containing geographic information. Every dataset consists out of 2 .csv-files! This is my folder-structure. All files in Tracks are formatted equally and all in Routes ...
1
vote
1answer
587 views

tiff to shapefile using GDAL - slow speed

I am converting a 500MB .tif file to .shp file using GDAL. I am using the following: gdal_polygonize.py .tiff file -f “ESRI Shapefile” out.shp However, I abandoned the first attempt as in 12hrs it ...
1
vote
1answer
18k views

How can I convert/transform coordinates from ETRS89 to WGS84 UTM 36N in QGIS

I am a student and just getting to know QGIS. At the moment I have to combine data which had been measured in ETRS89 with data in WGS84 UTM 36N. I created several vector layers for the data in ETRS89. ...
1
vote
1answer
529 views

Converting historical (1992/2000/2006) TIGER/Line files to modern shapefile formats

I'm trying to get some historical geographic information from Wisconsin and have been pointed the way of the TIGER/Line Shapefiles. Unfortunately, they're in a strange format (see, e.g., the files for ...
1
vote
1answer
395 views

Label only selected features with PAL PyQgis using an expression

I'm trying to label only selected features with an expression using PyQgis and the PAL functions, but I don't find any example and the API don't help me a lot (or I don't found it). My Qgis version is ...
1
vote
1answer
2k views

Adding a csv layer in PyQGIS

I am trying to load a series of csv files as vectors in PyQGIS. I run this code to try to get the first one: uri='file://D:/Saved Stuff/gulags/1.40.csv?delimiter=;&yField=y&xField=x' layer = ...
1
vote
2answers
614 views

Applying OSM z-order after osm2pgsql with qgis

I've trying to find a solution to applying the OpenStreetMap z-order in QGIS after using osm2pgsql. Everything is working perfectly, until I add the each layer to the canvas, where the z-order is not ...
1
vote
2answers
5k views

How to capture contour lines from OSM cycle map as vector?

In QGIS, there is a plugin to insert a OSM cycle map layer, that brings as an image from http. But I can't convert this OSM Plugin layer to a raster image. I can't even imagine how to get the contour ...
0
votes
1answer
80 views

Separate overlapping labels

I have many point features in close distance to each other and when I label them, the labels overlap. Is there a way that QGIS automatically seperates the lapels from each other and resolves the ...
0
votes
0answers
50 views

Least Cost Path in QGIS: Plugin or SAGA or GRASS?

I downloaded a SRTM file and followed this tutorial and now I have a hillshade layer and a color layer. It looks like this. I want to calculate the least cost path between p1 and p2. But I'm not ...
0
votes
1answer
161 views

Which WMS would work within China?

Is there a WMS service of satellite imagery that works within China? I know that Google satellite imagery is blocked. What about Bing? ESRI? Is there a local service? I'm not interested in using a ...
0
votes
0answers
43 views

Export geospatial PDF from QGIS on Mac

I am trying to take advantage of the new georeferenced PDF export in QGIS 3.10 but the checkbox is grayed out with a message that "GeoPDF creation required GDAL version 3.0 or later". The answers ...
0
votes
1answer
55 views

Legend Graphic for a multi polygon layer styled the same with unique (different) labels

When creating an SLD for a single polygon layer in QGIS and using that in Geoserver, by default the legend description is "single symbol". When you categorize the single polygon layer symbology and ...
0
votes
1answer
79 views

Determining percent land coverage around points of interest using NLCD and QGIS

A former grad student was working on a project using ArcGIS to calculate land coverage (specifically water) around the breeding location of a threatened bird species. His zones went out 3, 10, 17, and ...