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Questions tagged [qgis]

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

1
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0answers
4 views

Viewing 3D relationships of layered points and DEMs by displaying absolute height for both (QGIS 3.0)

I am using QGIS 3.4.3. I am an archaeologist and I would like to appropriately 3D view the Z relationships between (1) total station-derived points (with XYZ attributes), which I took on multiple ...
0
votes
2answers
41 views

Pixel depth and raster output won't align with the original

The problem Need to convert a raster .tif tile (DOWNLOAD) from WGS84 to GDA94 Albers; Need to convert its stored pixel info from Float32 to 8 bit UNSIGNED; Need Compression set to "NONE"; Need to ...
0
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0answers
5 views

Create private access to qgis2web maps on Wordpress site

I want to use Wordpress site and qgis2web plugin to show maps to clients. According to my idea, a user logins to his private page and gets links to his private maps. But when I upload qgis2web folder ...
1
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0answers
14 views

average weighted value by region with use of Voronoi in Qgis

I have a vector layer of Voronoi polygons. This layer has three columns -longitude, latitude, Z-value. I need to cut polygons by mask of administrative area and then I need to calculate average-...
-5
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0answers
38 views

las merge producing an error output in Qgis 3.4 [on hold]

I tried merging around 2 .laz files (they're not that big) into one .laz file using the lastools plugin of Qgis 3.4.0 'Madeira.' The .laz files were 'points2_tile_559000_4895000.laz' and '...
0
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0answers
10 views

3D Visualization Error

I am having an issue utilizing 3D Visualization. When I access New 3D Map View, the map that shows up is a 2D representation. Seeing this, I navigate to the 3D configuration tab (represented by a ...
-2
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0answers
35 views

Migration flow maps with QGIS 3.6 [on hold]

I want to make flow maps with QGIS 3.6 but without using the FlowMapper (because it doesn't work)
1
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1answer
20 views

How to stack points based on their latitude and longitude value on a raster image in QGIS

I have a Sentinel2 image. I have a CSV file that contains latitude, longitude and precipitation data over the location where the sentinel2 image was taken. Now I want to stack the precipitation data ...
2
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0answers
29 views

Getting attribute text error after running tool in QGIS?

I'm Korean, and I used Korean language text in attribute table. I ran Add raster values to points. (input shapefile and raster(aspect)) The tool works well, but result file's attribute table has an ...
1
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2answers
85 views

Starting a qgis project for a fantasy world map from raster images

I want to use qgis to georeference two fantasy (D&D) raster maps, one is the map for the entire world (Toril), one is the map for one of the continents (Faerun). This is the post with the world ...
1
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0answers
21 views

QGIS 3.4/3.6 standalone script

So, I have this little script (which I would like to build more upon). I was able to make it work in QGIS3.2 (just change all paths and environments to 3.2) but now, after deleting QGIS 3.2 and ...
2
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2answers
453 views

GRASS not working with QGIS 3.6

I updated QGIS to version 3.6 using OSGEO4w When I try to run any GRASS script, I get the following error message : This algorithm cannot be run :-( The specified GRASS 7 folder "C:\OSGEO4~1\...
0
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0answers
29 views

How to add filled circular rings (digitized) in vector layer

I digitize different habitats in one nature reserve. There was 40 ponds - I use "add circular string" option to give them a nice rounded shape. When I finish this 40 ponds I was instructed also to do ...
5
votes
1answer
502 views

Error in converting values in the field calculator in QGIS

I would like to calculate the flux of water in a river system. The flux is given in km3/year and I would like to convert it to m3/month. My syntax is: "flux"*1000000000/12 If I execute this the ...
0
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0answers
23 views

How to get QGIS layer information saved in JSON format?

I have called a URL to load imagery. Once the imagery is loaded in QGIS, I want the information of this layer (metadata), as seen in the below picture, to be stored in JSON format. NOTE: It can be ...
4
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0answers
23 views

How to use Layer Parameter variables in Field Calculator within a Model?

If I define a Vector Layer as an input parameter to a QGIS model, then the parameter name is exposed as a variable in a Field Calculator within the model, however I am unable to use this variable as I ...
5
votes
3answers
248 views

Display data-defined vector layer styling in the map legend?

I have styled a polygon shapefile with hexadecimal colours from a field (it's a geology layer and the colours are those used by the BC provincial gov't). The layer looks great, but the data-defined ...
2
votes
1answer
99 views

Partial raster reclassify in QGIS

I have a CHM model (raster) with values -10 up 100. I need to reclassify values as: value < 0 => 0 0 < value < 50 => the same value value > 50 => 0 I tried so many tools, but I cannot ...
1
vote
1answer
274 views

Open .fit image file

I am trying to open an image file with the extension ".fit". Does anybody know which software to use? I obtained this image using the WASI software (Water Color Simulator) available on the IOCCG ...
0
votes
1answer
161 views

Getting clip raster ERROR 1: Cutline feature without geometry?

I am using QGIS 2.18.15. I tried clipping a raster The mask layer is a shapefile. And it comes out as "ERROR 1: Cutline feature without a geometry" I checked the point data that I interpolated and ...
2
votes
3answers
153 views

Black theme (“Night Mapping”) doesn't load

At work we are using QGIS 3. When we were using QGIS 2 I enjoyed working with the black theme, called Night Mapping, for healthy eyes, etc. With QGIS 3, when I click on the menu of the themes and pick ...
1
vote
1answer
41 views

How to integrate QGIS 3.4 with the DE theme

I just got the upgrade to QGIS 3.4 from the ubuntugis-unstable PPA. One thing that immediately stands in this version is that it ignore the DE theme, instead yielding an unhealthy white-based theme. ...
1
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0answers
17 views

Point to line - Qwater model

I'm using EPANET in QGIS (extension QWater). I have different layers : pipe network (line vector) household (point vector) Firstly, I'd like to connect household automatically and perpendicularly to ...
0
votes
1answer
22 views

Select features and run multiple Interpolations for 2d raster from points in batch mode [on hold]

I would like to run over a 100 interpolation in sequence in QGIS, based on different selected features (elevations), which I would like to select based on a table with ranges, and then I would like to ...
1
vote
1answer
28 views

Showing only one feature per Report page in QGIS 3

The gift of Reports in QGIS is a massive step in the right direction. I have set up a department template for my team to use and it looks great! Right now, I am attempting to setup a report that will ...
6
votes
1answer
247 views

Cannot find layer error with Execute SQL in QGIS Graphical Modeler

I'm trying to sort a shapefile by one of its attributes using "Execute SQL", in the QGIS Graphical Modeler. Using a vector as input is working fine, but when I use a layer generated by an algorithm ...
7
votes
1answer
110 views

Stopping never ending QGIS processes instead of forcing QGIS to quit?

being a new to using QGIS on an iMac I often start processes on a large data-set that sets the spinning wheel in to a never ending state. I often need to force quit the whole QGIS program to break ...
1
vote
1answer
24 views

How to use attribute table field name as the Output filename expression in Print composer?

I have several features I want exported as individual images. I am using Print composer and the export process was successful, but the output shows generic filenames like output_1.png: It obviously ...
1
vote
1answer
38 views

QGIS SAGA functions failing “… following layers not correctly generated. …”

I've been having an issue with the SAGA functions for a while now, I believe since upgrading to one of the early 3.x versions. No matter which function I use they all fail with the same error (...
1
vote
1answer
44 views

QGIS 3.6: Vector “Polygons to Lines” missing

I use the tool Vector-->Geometry Tools-->Polygons to Lines all the time. It is in the menu up until 3.4. In 3.6, that menu item is no longer available. Where did it go? Is there another way to do ...
1
vote
1answer
43 views

What does the 'Field' selection do in QGIS report composer?

In QGIS 3.4 report composer, when making a field group section, there is a selection under 'layer' labelled 'field'. Here, one seems to be able to select from all the fields in the layer. But as far ...
0
votes
1answer
55 views

Seeking program similar to ArcCatalog in QGIS? [duplicate]

i'm qgis user. There is one inconvenience with using qgis, it's file management. when i used ArcGIS Desktop, ArcCatalog made me convenience for file management(especially file name change). QGIS, ...
0
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0answers
13 views

Create rotated rectangular map excerpt with local coordinate system from GeoTIFF

I work with numerical boundary layer/weather prediction models and simulate flow over topography (Areas below 100sqkm). As an input it takes topography as raster data, e.g. 400 cells in y and 600 ...
0
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0answers
23 views

Fixing sharp edges between GeoTIFF tiles? [duplicate]

I've downloaded a couple SRTM DEMS from http://srtm.csi.cgiar.org and when I load some of them into QGIS, there is a noticeable edge between 2 of the tiles (see image). Why does it happen? These are ...
9
votes
4answers
5k views

Renaming Shapefiles in QGIS?

I have a huge list of layers in a project that are named in a foreign language. I want to translate and add the English title to the name. When I right click on a layer and choose Properties -> ...
1
vote
1answer
54 views

From QGIS 3.4.5 and 3.6 asks password repeadly to connect to PostgreSQL 10

Action: At first time when opening project on QGIS 3.4.5 and 3.6 versions needs credentials to connect to PostgreSQL DB. Problem: But after that when connection is success with correct credentials ...
2
votes
1answer
82 views

Coordinates in GeoJSON file lost their decimals when opening in QGIS

When open the following GeoJSON file in QGIS 2.18 (drag and drop) , all point coordinates lost their decimals going, for example, from -9.350659, 44.32844 to 9, 44 . Same file is correctly shown by ...
2
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0answers
38 views

Identify same entities across time period

I have a few election district boundaries layers across several different elections, and I am trying to ascertain whether/how much the district boundaries have changed over time. They are labeled ...
2
votes
2answers
179 views

$area calculation doesn't work or wrong projection?

I've been reading the QGIS manual and I've encounter a problem I don't know what to do. I downloaded data from OpenStreetMap and the raster from http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp The ...
1
vote
1answer
51 views

QGIS 3 Processing Script refer to input layer

I'm new to Python and trying to figure out how to write my first Processing Script using QGIS 3.6 on Windows 10. I'm using the default template provided in QGIS 3 (Toolbox > New script from template)....
1
vote
1answer
31 views

How do I style polygons based on data from a column?

I have a multipolygon layer in QGIS 3.4. Attribute table looks like this. I want to style each polygon based on column Percent Ar. When I open Layer Properties >> Symbology, I choose "Graduated" ...
3
votes
2answers
9k views

Exporting high-resolution world map image from QGIS?

I'm trying to get some (very) large world map images (think 10k x 10k pixels etc), but can't seem to do it with QGIS. Manually adding smaller images to a larger one works (albeit slowly) for ...
1
vote
1answer
28 views

Change MultiLineString direction in QGIS/PyQGIS

I am looking for a method in PyQGIS (QGIS3.x) of reversing the direction of a MultiLineString feature. If there is more than one part, the order of the parts should be reversed. I have found a ...
-5
votes
0answers
47 views

which is better for Real estate Company Open source or Commercial Software for GIS? [on hold]

we build Mega project in new city (starting time), we build Geo database with ESRI (domain and sup type) and i want to know which is better for us open source solution or commercial solution, ...
0
votes
0answers
24 views

Interpolate 3D raster with Anisotropy

I am building a 3D geological model for soil deposits. I have two approaches to build a 3D raster. My dataset is about 300k points of bh information with texture and permeability at every meter ...
0
votes
0answers
27 views

Collecting and analyzing personal movement logs?

I'm looking for a program that logs what specific locations I've been to & how long I've been there, etc. Is this possible on QGIS? For example, if I took my laptop to the store today at 1pm (A1) ...
1
vote
0answers
11 views

How do I get mobile AR mode working in qgis2threejs?

I've created a map in qgis and exported using qgis2threejs and the mobile template. Everything renders fine in the browser (laptop and phone). Rotation, pan and zoom work as expected. When I load the ...
1
vote
1answer
205 views

Visualization of tin-created DEMs in QGIS via threejs results in tall 'church-spiral-like' column?

I keep having this problem while doing a simple 3D visualization of my newly created DEM in QGIS via the threejs plugin. I work in Balkan Zone 7 metric system and, when I try to visualise the DEM ...
-2
votes
0answers
37 views

Urban Planning open source application [on hold]

What is an open source program or application like GEOplanner or ArcGIS Planner? I want a feature comparison between them.
0
votes
1answer
74 views

OS Translator II TOID (fid)

I've successfully loaded in OS MasterMap to a PostGIS (2.4.4.1) database, and it appears in QGIS (2.8.9) fine. Somewhere during the load process the FID from the raw files (the TOID) gets replaced ...