Questions tagged [qgis]

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

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Generating unique fid using QGIS

I have a layer with a "fid" field which has a constrain "unique" and "enforce unique constraint". Every time I add a feature to this layer using QGIS GUI, it automatically creates a unique integer ...
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20 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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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 ...
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24 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 ...
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18 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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23 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 ...
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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 ...
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1answer
49 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 ...
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1answer
49 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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3answers
146 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 ...
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28 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 ...
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18 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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29 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 ...
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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,...
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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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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 ...
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1answer
41 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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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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1answer
38 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 ...
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20 views

Grass plugin not working

I am trying to work with GRASS in QGIS 3.10.1. I went to "Manage and Install Plugins", searched for it, and checked the box for GRASS 7. That brought up an error message that says "Grass was not found ...
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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, ...
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2answers
69 views

Extruding buildings without them floating in qgis2threejs

I am trying to extrude building footprints relative to the DEM. But buildings seem to be floating in the air. height_2 represents the heights of the buildings.
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26 views

QGIS error when accessing data from Database via eVis and ODBC

Using the "eVis Database Connection" I can access an ODBC data source which contains records with Lat and Long fields. The connection is made OK, and the "Database File Selection" window opens where I ...
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3answers
50 views

Importing Excel of multiple sheets into QGIS

I have an excel document of multiple separate sheets. I can import them one at a time by saving the individual sheets as CSV’s but is there away to bring the entire document into QGIS? The ...
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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 ...
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1answer
30 views

If I selected (highlight) a feature or points would I be able to color that feature as as it is being highlighted?

The points on purple and lightgreen area I want to maintain them reds. The points outside that I want to color them yellow not just the highlighted ones. How can I do that?
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1answer
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Units used for distance calculations by distance matrix tool of QGIS [duplicate]

I can't seem to get the measure tool to match up with my distance matrix tool regardless of what measurements I use. There are conflicting answers on other posts about this question. Both of my layers ...
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0answers
53 views

QGIS image export color issue

I'm having trouble exporting a map from QGIS to an image on Linux. The exported image has much stronger color contrast than inside QGIS. This occurs both on PNG and TIFF exports. I exported by ...
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1answer
38 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["...
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2answers
115 views

QGIS Upgrading from Madeira (3.4) to Coruna (3.10)

Quick question! I am running Madeira, which is my first and only installation of QGIS. Now that Version Coruna is available..... Should I bother to upgrade? If upgrading, should I first Uninstall my ...
2
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1answer
28 views

How to fit xyz file into map?

I am new to GIS and I want to fit a DEM given as an xyz file into an existing map. My problem is that when I open the xyz in qgis the tile is not at the correct position. Changing the CRS to the ...
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1answer
39 views

Calculating intersection angles of multiple polylines QGIS

I have one vector layer of multiple polylines that intersect each other in QGIS. What I want to do: calculate all intersections angles (2-ray, 3-ray, 4-ray and 5-ray types) in this vector layer. What ...
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33 views

Measuring distance between points across polygon [closed]

How do I measure distance around an object? I'm looking for an answer in R, Python, QGIS preferably. Here is my situation. I am trying to measure distance between points across an area of water. ...
2
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1answer
27 views

How to import a 1x1 degree text file into QGIS?

I have a text file with 360 columns and 180 lines, each number indicating a value for a one-degree cell. 1.32 1.43 1.67 1.61 1.57 1.39 1.22 ... 1.19 1.28 1.22 1.07 0....
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1answer
39 views

Double cascading value relation in QGIS attribute form

I run a PostgreSQL database using QGIS as a frontend. I have a table in which I store archaeological finds related to sites. The finds-table has no geometry and just stores date. To be able to query ...
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2answers
32 views

How to plot points on QGIS using postcodes?

I want to map a list of facilities around the UK by their Postcodes. I have no Eastings or Northings just postcodes. Is this possible via a plugin or do I need coordinates. I am using QGIS Version ...
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0answers
20 views

Problem with Python plugin [duplicate]

I developed a Python plugin to import a PostgreSQL project organized in QGIS with one click. The problem is that I don't put the layers it in the correct "tree scheme" in the layer panel. I enclose a ...
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1answer
36 views

QGIS Update Column

I have a CSV file which I would like to join to a TAB file. The TAB file has the table structure shown below. The column PLAN_NO is the unique reference in this table. The CSV file has the table ...
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0answers
35 views

Processing Toolbox from QGIS

I'm missing Processing toolbox in my QGis 3.4 (Mac-version). I know the feature can be activated when going to the Plugins and clicking it on. But it's not there. I've tried to solve this thing for ...
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0answers
33 views

Qgis-Replace file path in attribute table 'invalid Expression' [closed]

I wan't to replace my filepath in the attribute table but I'm always getting an invalid expression. I already tried to double the backslashes but I didn't work out.
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22 views

Text or tooltip for QGIS drag and drop form designer

Is there a way, to add tool tips or a simple text next to a field widget in QGIS forms drag and drop designer? I would like to provide more information about some fields (restrictions, expected value ...
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1answer
33 views

QGIS save layer as converts Layer Field Data Type

In QGIS I open a geodatabase and save one layer to a SHP file to work on. I use the "Save Layer As" option with the default settings. However I discovered that the SHP Field data type changes, in ...
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1answer
23 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
47 views

Uploading GPX Files to GPS (Garmin) in QGIS

I am fairly new to QGIS and GIS in general so it's hard to tell what I'm doing wrong. I am using a GPSMap 64st and can't seem to successfully upload any GPX files to it through QGIS. I am able to ...
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0answers
24 views

Polygons from Line layer grouped by value

Is there a method to create polygons from a line layer, grouped by data values? I have a line shapefile layer with +/-1000 records, about half of the records have a unique group value that ...
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0answers
24 views

Make a draw object option in Leaflet and that stores it in the webmap in a database or on a server

I would like to set up a simple web map which should be used as an information for those out in the field that needs to show something immediately. So I would just load the web map and get an overview....
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0answers
27 views

Error when using Fill Sinks (wang & liu) in Saga in QGIS

I am using fill sinks (wang & liu) from Saga in QGIS. When I run the tool I am having the following error: Loading resulting layers The following layers were not correctly generated.C:/AGMEE/...
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0answers
16 views

Combining orthophoto and DEM to export xyz-CSV

I have a georeferenced orthophoto and a DEM as tiff-file. For my further workflow I want to export x,y,z (x,y from the orthophoto and z from the DEM). I already managed to create a point layer and ...
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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 ...
3
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3answers
109 views

Hiding points in shapefile layer using QGIS

I am using QGIS 3.4 I would like to hide all points that end with "5". For example, I would like to hide: 55, 65, 75, 85 and any point ending in "5". What method can be use to make this possible?