Questions tagged [qgis]

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

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12 views

Recenter maps to overlap in QGIS or GDAL [closed]

I have a really basic question which I can't wrap my head around. I have a GeoTIFF of the world and a shapefile containing the oceans. The problem is that the GeoTIFF is centered at -180° longitude ...
-1
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0answers
36 views

Generating unique fid using QGIS [closed]

I have a layer with a "fid" field which has a "unique" constraint and an "enforce unique constraint". Every time I add a feature to this layer using QGIS GUI, it automatically creates a unique ...
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1answer
25 views

GeoServer v2.14 Responses to DescribeFeatureType Requests

A browser's (Chrome) DescribeFeatureType request to GeoServer version 2.12 returns an inline XML response in the browser's window. Using that same browser to send a DescribeFeatureType request to a ...
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1answer
66 views

Adding sketch in QField?

I want to use QField to collect data in the field. I need to draw some sketch and save it to the corresponding geometry (point in my case). Is it possible to do that? Geopaparazzi is able but I don'...
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1answer
22 views

How to burn coordinate point of polyline to the pixel value while converting it from vector to raster

I am trying to plot a proximity raster for secondary roads in a particular area. What I have is a set of polyline representing the roads. Now, I want to create a proximity raster based on the polyline....
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1answer
167 views

Shapefiles rewritten to 100 bytes

When you run QGIS and open a project file (.qgs), a new version of QGIS will read the .shp files and update them for format changes that go with the new version. The changes finish, but don't work, ...
2
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1answer
761 views

Crayfish 3.0.0 not working in QGIS 3.4.3

I tried to install Crayfish 3.0 in QGIS 3.4 and although I didn't get any errors during the installation of the plugin I don't have access to all Crayfish features. I can only use the 'plot' and '...
1
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1answer
73 views

QGIS: Joining data from multiple road lines onto polygons by location

I'm looking to add traffic data linked to a polyline shapefile of road centerlines to a multipolygon shapefile of land parcels. I want to join this data using proximity to roads instead of by matching ...
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1answer
23 views

Using PyQt5 Objects inside QTabWidget and QScrollArea - QGIS Plugin

I'm using PyQt5 and QT Designer to create the user interface for my QGIS plugin. Now I'm learning to use QTabWidget and QScrollArea. What I don't understand is how to use the objects inside tabs or ...
16
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4answers
37k views

Drawing Circle with set radius using QGIS?

I have a site and want to draw an indicative line in a 5km buffer around the centre of the site. So I want to draw a circle with a radius of 5km. I have a tool for drawing circles and ellipses and ...
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2answers
76 views

QGIS label only points inside polygons

I have a dataset of around 20,000 points in a point layer and a polygon layer with a few hundred polygons. Some of the points lie inside the polygons, others do not. I'd like to label every point as ...
4
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3answers
158 views

Creating point at line end using QGIS

For an examination of a local power grid, I need to mark the transformation stations (substation) by simply create a point for each station. What I want to do is that QGIS creates a point at the end ...
4
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2answers
362 views

Density map of pedestrian paths and footways in QGIS

I need to identify public places within pedestrian areas in London, so I need to calculate the density of both pedestrian links and footways. I have classified my data according to the categorization ...
4
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2answers
3k views

Angle at intersection point from two Lines

I would like to find the angle of two lines at their intersection point. In my opinion it is the azimuth I'm looking for, right? So I'm using Python with shapely for finding the intersection and ...
6
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1answer
86 views

Merge/join only the lines which are snapped to vertices in QGIS

I have polygons drawn with AutoCAD as Mline (Multiline type) which are rendered in QGIS as 8 segments for each feature. An example of one selected feature is shown in the picture below: I want to ...
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0answers
23 views

Installing QGIS 3.4 and 2.18 on Ubuntu 18.04

I see from this older post that it was not possible to install two versions of QGIS on the same Ubuntu box with out using a virtual environment. Now that we are a bit farther along I am wondering if ...
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0answers
28 views

Importing GPS coordintates in Decimal Degrees with N and S at the end instead of + or -

I have a CSV file with GPS coordinates formated in decimal degrees. Instead of using negative symbols for south hemisphere and east of the prime meridian coordinates some of the coordinates shows a N ...
1
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1answer
40 views

QGIS Labeling Override

I am using QGIS 3.10.0 A Coruna. I would like to label a building layer with with its building number. However, sometimes I have 2-3 buildings with the same number, and I would like to override the ...
0
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0answers
25 views

Show GeoPDF coordinates in metres using QGIS

I exported a GeoPDF map using British National Grid (projected coordinates). But the coordinates on the PDF is shown in geographic coordinates (lat lon). And I would like to see the coordinates of the ...
2
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1answer
403 views

Using environment variables in *.qgs-file

Is it possible to use an environment variable in qgis project file (*.qgs)? For example : <datasource>dbname='QBASE' host=10.1.1.1 port=5432 user=USERNAME sslmode=disable key='gid' srid=0 type=...
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0answers
8 views

QGIS MMgis Google Maps KML export returns wrong styling

Following the query posted here: QGIS transparent polygon returned after digitizing and hint here: Is there a way to export the style, along with a shapefile, to a kml in QGIS? I managed to export ...
3
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1answer
53 views

Calculating polygon attribute based on intersection with grid in QGIS

I'm trying to use QGIS to profiling polygons in a layer. There is also another grid layer, each grid contains its own demographics information. Assume the demographics are evenly distributed within ...
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2answers
47 views

QGIS 3.10 moving all merged layers at once

Good afternoon, Following the query: QGIS 3.10 problem with merging layers & multipart promotion I merged my layers into one piece. Now I would like to make them draggable across the map, as per ...
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6answers
26k views

How to access QGIS Plugin Repositories from behind a proxy?

I have been trying to teach myself QGIS by using this forum and others to help. Most of my questions can be answered by downloading plugins that are available through 3rd party repositories but for ...
1
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1answer
53 views

What Projected or Geographic Coordinate System should I use to calculate km distances between various points on a large scale map?

I want to measure distances using the distance matrix tool on QGIS between the yellow dots and their closest blue dot. I want my output to be in KM and to be as accurate as possible. I don't want to ...
0
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1answer
87 views

Using QGIS to create a GeoTIFF raster of Google Earth import

I've managed to link QGIS3 to Google Earth via XYZ tiles. I would like to convert the Google Earth map shown to a GeoTIFF raster (to save on memory?). I try and export the Google Earth layer to a ...
4
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2answers
8k views

Extract WMS data from the OneGeology Portal

I am trying to extract geological information from the OneGeology portal unfortunately most of the data there only consists of WMS data. For example, is it feasible to extract a particular legend ...
3
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1answer
633 views

Is it possible to open WMC(Web map Context) file in QGIS?

I am new to WMC and in our application we had a requirement to extend the WMC functions. For that I need to know whether QGIS have the support of WMC files. Or we need any plugins for WMC support ...
2
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0answers
530 views

Using processing using other output (result from another algorithm) as input [closed]

I have a problem. I am developing a standalone app in Python and I need to use processing algorithms. I was able to use one algorithm without errors but I need to run other processing algorithm which ...
0
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1answer
361 views

Edit a view of a PostGIS table in QGIS

I have a simple layer in PostGIS created as follows: CREATE TABLE layer ( id serial PRIMARY KEY, geom geometry(LINESTRING, 31370), ... ) To avoid duplicate information, I created a view ...
1
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0answers
30 views

QGIS Rasterize - Use highest value in cell as burn in value

I am trying to create raster layers of presence/absence bridges in a project area to use as inputs for habitat suitability models. I am using 15 m x 15 m cell size. The presence of bridges is ...
4
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1answer
260 views

PostGIS table shows twice in QGIS Browser panel

I've observed for a while that for many (but not all) of my tables, QGIS 3 (2.99) shows the same table name twice in the Browser Panel on the left, when I expand my PostGIS data source. The first ...
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0answers
29 views

Extracting coordinates of points from grid cells

Within QGIS, I have two layers: (1) a layer of points and (2) a grid layer. Each grid cell has its own ID. For each grid cell with greater than 10 points, I'd like to extract the coordinates for the ...
2
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1answer
297 views

How do v.distance 'upload' parameters actually work?

I'm trying to use v.distance (using QGIS 3.4) to calculate the distance in meters between a layer of water shutoff points and the boundary of the nearest building footprint polygon. Even better would ...
7
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5answers
13k views

Getting image pop ups in QGIS?

I have a map of an area and georeferenced photos. I need to be able to bring the pictures as points and then be able to click at a certain point and an image pop up. I have revisited this issue, i ...
0
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0answers
19 views

How to generate XYZ tiles from a large image in QGIS with plugin XYZ tiles? [closed]

Frankly speaking, I've post here https://stackoverflow.com/questions/59726598/how-to-generate-xyz-tiles-from-a-large-image-in-qgis-with-plugin-xyz-tiles . Yesterday, I found here a bette
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1answer
39 views

Create prj4 file for NAD27 Mexico from prj file for import to QGIS

I would like to be able to add the NAD27 MEXICO projection to QGIS, MapInfo, etc. Global Mapper has this projection, and the prj file is: PROJCS["NAD_1927_UTM_Zone_13N",GEOGCS["...
0
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0answers
14 views

VRT with many files has glitchy display

I have a dataset comprising the entire province of Saskatchewan. The province is divided into 296 Rural Municipalites (RMs) which each produce a paper(!) map. As I acquire the maps (150 so far) I scan,...
1
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1answer
97 views

Batch raster operations to get Maximum Precipitation in Catchment

I have information of maximum precipitation per grid cell for a certain area over 55 years, each year is a different matrix with the corresponding precipitation values. I know that I need to do the ...
7
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1answer
111 views

Show Symbol (e.g. City-Marker) only when an associated label can be displayed

I'm building a map for a certain region with many cities to be displayed. Some of the smaller cities should only be displayed if they don't overlay bigger cities. While the labels of the smaller ...
0
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0answers
19 views

QGIS 3.10.1 and 3.6 don't pull to front when clicked on taskbar? [duplicate]

There's a similar question already (QGIS 3.4 won't come to the foreground), but it's been left unanswered and I don't have enough reputation to add a bounty, so please don't yell at me. Like ...
2
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1answer
42 views

Calculate distance from a point to a MultiLineString geometry - PYQGIS

I'm trying to calculate the distance from a point to the closest river in my QGIS plugin. But I receive this message: MultiLineString geometry cannot be converted to a point. Only Point types are ...
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0answers
14 views

Processing Toolbox and Python Console are missing on Mac [closed]

I am having a difficult time installing QGIS on my Mac. I installed the QGIS 3.10 stand-
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1answer
94 views

qgis2threejs window is blank

I have used QGIS2threejs for several years in QGIS2. Now we have upgraded to QGIS3 at work and the plugin no longer works. The qgis2threejs window is blank and it displays the error “Any 3D objects ...
4
votes
6answers
194 views

Profile Tool has too high resource consumption: Alternative or work around?

I'm trying to generate a profile along a track (bike trail) using the Profile Tool Plugin from QGIS, but it consumes more than 14GB's of RAM so it can't finish it's work. DEM: 200m GeoTIFF Profile-...
2
votes
1answer
42 views

Remove part of a polygon

I am using QGIS 3.10.1, and I am trying to fix invalid geometry in a number of polygons. This polygon (orange) surrounds a road, but also has a sliver going straight across. As a fairly new QGIS ...
3
votes
1answer
56 views

Easy way to close open clipped contours with the edges of the clipping mask?

I am trying to programmatically (with pyqgis) clip contour lines that I've generated in QGIS, but make it so that the clipping mask forms the new edges of the contours, rather than leaving the ...
1
vote
2answers
49 views

QGIS 3.10 how to execute original features of merged layers

Good afternoon, Following this query: QGIS 3.10 problem with merging layers & multipart promotion I've managed by merging the layers featuring the same geometry. Unfortunately, the effect is ...
0
votes
0answers
32 views

Spatiotemporal analysis with polygons and points

In QGIS, I have a dataset of burned areas (polygons) and lightning strikes (points). In both datasets, I have the date of the fires, date of the lightning strikes, latitudes, and longitudes. However, ...
1
vote
1answer
85 views

QGIS Mask - Error Code

I am trying to interpolate points and then clip the interpolation with a Raster> Extraction> Clipper. I receive an error code after trying to mask over the region I am interested in. Would you ...