Questions tagged [qgis]

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

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2
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2answers
89 views

How to conditionally format a table from Excel in the layout view?

I'm making a layout view, thing and have run into a problem. I have formatted my table beautifully in Excel, see Picture 1, but when I import it to QGIS it clears the formatting. The color goes away, ...
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2answers
90 views

Do SAGA tools work on QGIS 3.10.7?

Is anyone successfully using SAGA tools in QGIS 3.10.7? I have downloaded QGIS 3.10.7 on multiple PCs and a Mac. All of them have resulted in the same problem when I try to run SAGA tools. A message ...
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1answer
58 views

How to change a line Symbol layer type using PyQGIS? [closed]

enter image description here I need to change a line style from Simple Line to Marker Line, and after that, use it as an arrow and change it's rotation and colors using PyQGIS.
2
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1answer
80 views

Converting an unprojected coordinate system to a projected one in QGIS 3.10 without ruining data

I am new to GIS and I think I may have posted on the wrong website: https://stackoverflow.com/questions/62595452/how-to-convert-an-uprojected-coordinate-system-to-a-projected-one-in-qgis-3-10-w I ...
1
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1answer
45 views

ArcMap, QGIS 3.10.7, QGIS 2.12.3 all interpret ASCII file values differently

I have QGIS 3.10.7 and QGIS 2.12.3. I am loading the same ASCII (.asc) file into both versions of QGIS. QGIS 3.10.7 says the values in the ASCII file range from 186.573 - 1458.33. QGIS 2.12.3 says the ...
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0answers
28 views

How can I interpolate the z Values (height) from a TIN (Raster) to a line (vector) - QGIS

I have a ratser (TIN) and I want to interpolte the heights (z-Values) to a line Shape. Everything that I find is interpolation between some points and making a raster. For example, Raster creation ...
1
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1answer
34 views

Change feature colour and legend

I am very new to GIS stuff, I am looking at a dataset displayed in WMS, I have attached the image of what it looks like. I want to change the feature colour of Mine and ERW to Blue and Pink ...
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0answers
14 views

ECW not recognized as a supported file format [duplicate]

I an building standalone application using pyqgis. I want to import ECW rasters into QGIS project and it worked in QGIS Python console on a Windows machine using code: def add_ecw(rast_path, project): ...
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1answer
31 views

QGIS 3x can't run the custom crs for Ordnance Survey maps

Recently I solved the problem regarding the mismatch between British National Grid CRS and WGS 84 in the query below: QGS 3x Ordnance Survey map doesn't overlay the Google Maps properly I ...
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0answers
20 views

QGIS 3x image georeferencing - problem with transformation type and resampling method

Good morning, I would like to georeference my image in QGIS. I know the process, but I don't know which transformation type & resembling method should I use. I found some answer here: ...
2
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1answer
85 views

Installing QGIS Plugin with Python code

Is it possible to install QGIS Plugins with Python code? I would like to be able to provide users who have a basic QGIS image served up to them, to be able to quickly install all their required ...
2
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1answer
34 views

Combining linesegments that are contionous into one feature in QGIS 3.10.7

I have a dissolved line, where I have clipped some segments where I would like to create a feature for each individual segment. I have tried using "Vector Geometry -> Multipart to singlepart&...
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1answer
19 views

Add classes to raster visualization

IT's my first time working with rasters in QGIS. I'm working with a single band gray raster. It has 5 classes. When I open it in QGIS, I can see the gray scale for the 5 classes. However, in the ...
5
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1answer
107 views

Copy and Pasting broken on QGIS 3.14

With the latest update, is anyone else experiencing issues with copying features from one layer to another, or copying features within attribute tables. I am noticing that the keyboard shortcuts for ...
3
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0answers
31 views

Multiple styles for GeoPackage

I am constructing a geopackage from vector layers that have values for number of years, each year is an attribute (1965, 1995, 2025, 2055, 2085). I have styled the layers and added the styles to the ...
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0answers
17 views

Points to path and Reprojecting

My dataset contains the beginning and ending points of certain street segments in a city. I used Points to Path to create a line between the two. What I want to do is use Points along geometry to ...
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0answers
25 views

QGIS: Setting Active Layer in Plugin

I am creating a QGIS plugin and have a layer named "dataset_three" that I would like to activate in my Python code. My code runs, but the check mark next to the layer does not appear. Code ...
0
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1answer
41 views

How to configure Saga Tools on Qgis script

I'm trying to use the process saga:paramemeltonruggednessnumber as following : melton_saga = processing.run("saga:parememeltonruggednessnumber", {'DEM' : path_filled, '...
2
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1answer
21 views

Use QgsAbstractProviderConnection in PyQGIS (3.14)

I created a PostGIS connection named 'test_conn' and try to access it via from qgis.core import QgsAbstractProviderConnection con = QgsAbstractProviderConnection('test_conn') as described in ...
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0answers
7 views

QGIS 2.18 - keeping field properties when using data management or copying layers

I want to use Data management tool to "join attributes by location". this creates a temporary layer with the data. I can apply the style of the original layer, but not the field properties. ...
1
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1answer
26 views

Diffrence in QField Sync's offline editing vs. copy & replace

What is the advantage of configuring a layer in the plugin "QField Sync" for "offline editing" vs just leave it at "copy", do the field work and then copy the edited data ...
2
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1answer
36 views

QGIS 3.10.7 Buffering a line by 1m with flat end cap, produces “cracked” buffer

I need to buffer a line 1 meter, however when running the buffer tool in QGIS with the end cap style as "flat" I get the result shown below. What causes this, and how can I fix it?
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2answers
61 views

Extracting point coordinates from QGIS into Excel using Python [closed]

I was formerly working on ArcGIS but now I'm working on QGIS 2.14.7 and Python 3.8 so I'm a bit confused with the QGIS script. I have to extract coordinate of point layer (CRS:Lambert 93 and WGS84) ...
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0answers
43 views

Organizing columms in QGIS 3.14

I am using QGIS 3.14. I want to organize my columns in the attribute table but I cant change the virtual fields columns place. It is always last. Can I put it between two non-virtual fields columns?
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0answers
15 views

Maintaining Form Designs with one Geopackage to Multiple Different Projects

Long time reader, first time poster. I work for an Archaeological consulting company in Australia and one of the major parts of our job is to go out and survey for aboriginal heritage sites before ...
2
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1answer
62 views

QGIS (3.10.7) SAGA tools resulting in “The following layers were not correctly generated.”

I am using QGIS 3.10.7 and want to use SAGA tools. I am using an ASCII file (.asc) with a projected coordinate system - EPSG:26919 - NAD83 / UTM zone 19N - Projected. When attempting to use the tools, ...
0
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1answer
27 views

Could a QGIS plug-in conceivably save and restore the main-window geometry of any project?

With respect to this: Restoring the exact original situation of a spatial bookmark? and this: How to Resize the Qgis Main Window from python Q. Could a plug-in conceivably save the current state of ...
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0answers
27 views

Making a 3D map by interpolation by stacking data for different depths

So, I have the data of shipping Noise levels at various coordinates (300x300 km grid, with 900 coordinates). I have the Noise levels for 5 depths (10m, 30m, 50m, 70m, 90m) and I while I am able to ...
0
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0answers
24 views

Using geometry generator to create line hatch fill

Since QGIS rasterizes any sort of pattern fill, I have been searching for a way to create, through the geometry generator, a line-hatch fill for a polygon. I so far haven't found anything I can easily ...
0
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2answers
36 views

QGIS 3.10: why is PCS project, loaded with a single PCS layer, showing only geographic (angular, lat/long) coordinates instead of linear ones

[OP: my error, circle CRS in LR corner is Project's CRS, not layer's.] QGIS 3.10; Ubuntu 18.04 Glossary for new users: CRS-Coordinate reference system (one of two types, geographic or projected); GCS-...
0
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1answer
32 views

What could be the reason why QGIS3.10 long term release Coruna version crash in Win10 OS?

I have been working on some basic functions such as joining data and producing maps on Win10 using QGIS3.10 app. I am quite sure that the everything was still fine yesterday however, today the app ...
8
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3answers
220 views

Finding longest straight line within polygon in QGIS

I'm looking for an algorithm to draw max distance straight lines contained in a polygon (without crossing polygon boundaries). How can I perform it? As you can see some polygons are very oddly shaped. ...
3
votes
1answer
243 views

How to use a Processing Algorithm in a expression function used in a Geometry Generator (Points Along Lines “on the fly”)

I want to use the Processing Algorithm, pointsalonglines, in the expression function used in Geometry Generator. This is because I want to create points "on the fly" along my line and in a ...
1
vote
1answer
29 views

QGIS label text to raster

I created a multi-point shapefile and added number text to show as labels around the centroid of each point. Is is possible to rasterize the points and labels? I was thinking I could create a PDF and ...
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1answer
51 views

QGIS 3x problem with CRS for comma delimited layer

Good afternoon, I would like to overlay my .csv comma delimited layers in QGIS 3x properly. I have got the Ordnance Survey Maps as the raster players, which CRS is EPSG 27700 1936 British National ...
0
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0answers
30 views

PyQGIS and Time Manager Plugin

Where can I find more information regarding using the Python interface in QGIS with the Time Manager plugin. I made an animation in QGIS and am trying to automate some processes with Python, however I ...
0
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2answers
61 views

Ubuntu 20.04 with QGIS 3.14 (pi) SAGA is missing

After updating to QGIS 3.14 in Ubuntu 20.04, SAGA is not available. The Log Panel (View->Panels->Log Messages) said SAGA didn't load. In the Processing Toolbox, the SAGA category is missing.
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0answers
20 views

Update attribute table by values from other layer

let's imagine that I have 2 different layers with geometry. Some objects from the first layer are "within" the second layer's objects. I'd like to update firstLayer_value in attribute table ...
2
votes
1answer
33 views

Creating raster with same size as DTM raster containing certain percentage of zeros and ones using QGIS

I've got a DTM and would like to add 1m to a percentage of the points, so I thought of creating a new raster containing either zeros or 1m and add the two raster together. I didn't find any tools that ...
0
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1answer
35 views

QGIS Voronoi polygons being generated incorrectly

I am trying to generate some Voronoi/Theissen polygons from points across the UK. From my understanding, any point within a Voronoi polygon should be closer to that polygons origin point than any ...
3
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0answers
24 views

Installing plugins for all users and on multiple servers

I'm running QGIS on a set of high powered terminal server for our students. I want to install a set of plugins for all users on all the servers, making the plugin manager a bit sluggish to use. Is ...
0
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1answer
38 views

How to delete groups of grid files based on pixel cluster size (under 10)?

I am new to QGIS, and I am currently using flood modeller to produce a series of surface water maps. Once the data is ran, I get a series of 10m2 grid tiles with varying Z flood Values. We are only ...
0
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0answers
33 views

How to convert Geographic Coordinate system to Projected coordinate system INDIA for HEC-RAS without ArcGIS?

The DEM data is downloaded from https://bhuvan-app1.nrsc.gov.in/ website. I want to use it for HEC-RAS project but it has a geographical coordinate system, how can I convert it to projected one ...
0
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2answers
50 views

QGIS 3.10: Project and Layer have Proj. Coord. System, why is layer tilted?

[OP edited to change tense and to show correct steps, in italics] QGIS 3.10, Ubuntu 18.04 I was questioning why my map displayed at a +10 degree rotation, but displayed unrotated in the Print Layout. ...
0
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1answer
25 views

QGIS 3.10: setting default CRS for new projects is ignored

QGIS 3.10 honors my change of the default CRS for new projects--until I exit... (Caveat: I've discovered that something is changing the default setting even during a session.) Repeatably, QGIS 3.10, ...
2
votes
2answers
140 views

Isochrone along direction map of watershed

I am interested in producing a isochrone map given a raster speed map and a direction map (like the output of r.watershed), but I do not see how to produce it. I have studied r.walk and r.cost wich ...
1
vote
1answer
38 views

Calculate the distance between points and the start of each lines

I am trying to calculate the distance between the green points and the red point on their left and add that distance to the green points attributes. The lines are roads and I made the red dots using ...
3
votes
1answer
106 views

Add and change attribute / feature cascaded (QGIS)

I have a polygon layer with hierarchical polygons. The main polygon has a capital letter like 'A' or 'B'. All polygons inside the main polygon got a number and all inside them get a second, third, ...
2
votes
0answers
29 views

QGIS- editing form auto completion

I'm new in QGIS world :) I would like to have an auto-completion script within the editing form on QGiS. When editing a point features with QGIS form, I would like the script to identify the list of ...
0
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0answers
39 views

Sharing QGIS Project that connects to local postGIS database

I am looking to share a QGIS project with a few others outside my network. The QGIS project is using layers from a postGIS database I created locally. I am wondering what the best way is to go about ...

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