All Questions

38,069 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
1 vote
0 answers
115 views

How to display label in center of symbol when using Points Displacement in QGIS

I have been attempting to display all the locations of some facilities I have to map. Due to the lat/long coordinates, they are overlapping. Therefore, I tried using points displacement when choosing ...
Anmol's user avatar
  • 11
1 vote
1 answer
60 views

SRTM resolution increase (~88m to 30m) causes a windowpane check pattern in subsequent hillshade, aspect, slope, etc

I'm working thru QGIS trainings and ran into this: Task is to use both a low-res Rainfall SRTM (32733) and a higher-res DEM/SRTM (4326) to produce rainfall, slope, and aspect layers, combine them, ...
DomO's user avatar
  • 11
1 vote
0 answers
115 views

PostGIS ST_ApproximateMedialAxis producing odd results

I attempt to get the centre line from a simple polygon (centre line is ambiguous; but I need a line through the centre of the polygon whatever the shape: the shape is always a long buffered line ...
Phish's user avatar
  • 165
1 vote
1 answer
434 views

How to convert convexhull polygon from geodataframe to shapefile

I have a point geodatafram with a classcolumn. I wanted to make a convexhull for each class and then write it as a shapefile. but I got error to convert it to shapefile. print(gdf.head()) Convexhull =...
Anahita Kp's user avatar
1 vote
0 answers
813 views

PostGIS: ST_Transform error

I have a table (tbl1) containing POINT geometries in EPSG:27700 (British National Grid). SELECT id, ST_AsText(geom) as geom FROM tbl1; = id | geom ------+-------- 1 | POINT(363179.79 176400.12)...
Theo F's user avatar
  • 1,817
1 vote
0 answers
68 views

Exporting map to PDF using PyQGIS freezes the CLI

When I try to export PDF using PyQGIS 3 API the CLI freezes when the execution reaches the exporter.exportToPdf(pdf_fpath,exportSettings) call, and no PDF is exported. even though I can export the PDF ...
geogeek's user avatar
  • 4,566
1 vote
0 answers
119 views

Display line with color gradient (or fade effect) based on the value of the vertices it connects

I have two vertices connected by two lines (we can assume way out and way back from point A to point B). In the picture I represented the lines with two arrows curved by adding a midpoint and its ...
Michele Cordini's user avatar
1 vote
0 answers
53 views

Topolgy vs simple features

I'm starting using PostGIS, and then I found the main extensions of it, Simple Features (postgis), Topology (postgis_topology), Rasters(postgis_raster). The Topology extension is great, in some ...
Abs_0_'s user avatar
  • 71
1 vote
0 answers
167 views

QGIS Graphical Modeler - Using field calculator to add values to point grid

Using the QGIS Graphical Modeler, I'm trying to add values from a raster previously generated in the same model to a point grid generated in the same model as well. I know I can do it using another ...
Rafael Pinheiro Machado's user avatar
1 vote
1 answer
114 views

Refresh PostgreSQL table to show new fields

I have PostgreSQL/PostGIS tables and am adding fields in DB Manager. I have to remove and add the tables to QGIS for the new fields to appear. I have tried: Reload table (the icon in the attribute ...
BERA's user avatar
  • 72.1k
1 vote
0 answers
63 views

Can ArcGIS Pro read the labels in shapefiles created in QGIS?

Can ArcGIS Pro read the label placement, label formatting and colors in shapefiles created in QGIS?
Johntr's user avatar
  • 19
1 vote
0 answers
43 views

How to align drop-down display in a QGIS dock plugin

I have made a QGIS plugin using the dockwidget display mode. The GUI is made with Qt Designer. It contains a few dropdowns, one of them for layer selection. It's working really well, but when the ...
Leo's user avatar
  • 701
1 vote
0 answers
942 views

Upload shapefile to GeoServer using JavaScript REST API

I am trying to programmatically upload a map into GeoServer as a layer. The user requirements as such that this data has to be uploaded from memory directly into GeoServer, using JavaScript. I looked ...
SharmaPN's user avatar
1 vote
0 answers
86 views

v.to.3D failing in QGIS

I'm trying to use v.to.3D in QGIS to create lines with proper elevation so I can export it to DXF. However, I'm running in to some issue when using v.to.3D. When googling I have seen others asking the ...
kaj.n's user avatar
  • 79
1 vote
0 answers
25 views

QGIS report: picture rotation does not work properly

In my report shown in the picture below, I’d like to add a red arrow (as a picture) on top of the north arrow to visualize the direction I took the picture from. I added a integer field to my point ...
Motti's user avatar
  • 424
1 vote
0 answers
265 views

Points in Polygon extraction

I have a shapefile with MSK-16z2 crs and a las-file which crs can not be recornized by qgis, but attached to the las prj contains also MSK-16z2. I need to crop described lasfile by shapefile. I tried ...
Марина Лисниченко's user avatar
1 vote
0 answers
94 views

QGIS cannot find transformation grid

When I open an existing QGIS project I get an error bar at the top of the mapping window stating that some data cannot be projected (see below). I can click on the details button and I get the ...
GBG's user avatar
  • 9,689
1 vote
0 answers
113 views

QGIS Print Layout attribute table source as model output

I have created a model which extracts features from larger shapefile databases around a site boundary. Each time I run the model I am using a different site boundary, however the outputs have the same ...
JackP's user avatar
  • 323
1 vote
2 answers
538 views

GeoServer changing raster color as scale changes

I have a Sentinel-2 image published on my GeoServer. When I preview the layer, I can see it changes coloring somehow as I zoom in / out. You can see examples in images below (look at the scale values ...
Magno C's user avatar
  • 2,130
1 vote
0 answers
201 views

KML file saved with wrong CRS how to remove the layer shift?

I have the topography layer with the British National Grid CRS EPSG 27700. Unfortunately, the KML data represents the other CRS - EPSG 4376 WGS 84. It's sure-fire, that the data will be shifted ...
Geographos's user avatar
  • 4,087
1 vote
0 answers
88 views

After splitting a line into 3 equal parts, the resulting parts are non-continuous

I have lines that I want to split into 3 equal parts, in order to check that my sampling points are in the last third of the line. I used the editor and the split function as shown in the photo 1, the ...
Alfonso Sola's user avatar
1 vote
1 answer
487 views

Getting user input value from ArcGIS web app

I want to have user input an integer value which can then be used in an Arcade expression (for example in a popup menu). Is there a way to do this on ArcGIS Online? I am looking for a solution that ...
ZZZ's user avatar
  • 530
1 vote
0 answers
631 views

Converting dbf to shp with QGIS

I want to transform dbf to shapefile with QGIS. I see the polygons in QGIS, but when I try "export", "save as", or from Toolbox "Extract/Clip by extent" - I see the ...
Katia's user avatar
  • 11
1 vote
1 answer
1k views

What are the higher-resolution tracks on the ocean floor in Google Earth?

In Google Maps, the oceans are crisscrossed with what looks like slightly darker lines and patches. Zoomed in, they appear as thin tracks and whole tiles of higher-resolution imagery, with detailed ...
Alexander Pavlov's user avatar
1 vote
0 answers
197 views

Create Buffers that are contained within a polygon with shared attribute

I'm using ArcGIS Pro to try to solve this problem. I'm mildly competent in ArcPy but have not attempted to script this. What I would like to do is create a buffers that stay contained within the ...
Andrew Laney's user avatar
1 vote
1 answer
1k views

Combining .tif files into multidimensional mosaic raster for analyzing change using ArcGIS Pro

I have a bunch of .tiff files with lichen cover data, one for each three year period from 1986 to 2021, and I want to use either (or both) the Analyze change using LandTrendr/CCDC tools in ArcGIS Pro ...
James CW's user avatar
1 vote
0 answers
43 views

Assembling output into one shape when loop is used in python script in QGIS3?

I’m writing a new processing script for QGIS 3 using a for loop in the code. The "problem" is that if I try to iterate N times, N shapes are generated in output. I would like to have only ...
Peter's user avatar
  • 31
1 vote
0 answers
63 views

Layer extent value not matching with CRS extent

I want to clip a polygon layer to an extent of another polyline layer. I want to use extract layer by extent processing tool, I want to automatically fetch the extent of my polyline layer along with ...
Rajesh Patnaik's user avatar
1 vote
0 answers
614 views

Implementing Leaflet plugin "Leaflet.Control.Layers.Tree" in R leaflet

I want to use "Leaflet.Control.Layers.Tree" in my R script. I am using the leaflet R-package to draw my map. I found this great leaflet plugin: "Leaflet.Control.Layers.Tree". How ...
Lennart Jongen's user avatar
1 vote
0 answers
49 views

Relate two tables with different number of entities

I want to join two layers: One which has information about the height and width of the wind turbines (fields to join) with only 4 or 5 entities or sometimes less, and the other is a layer with lots of ...
DobleG_95's user avatar
1 vote
1 answer
185 views

What could be causing ENMTML occurrence data problem - undefined columns selected?

Absolutely loving the ENMTML package for really making thoughtful choices for ecological niche modeling! Until I came across this problem with a single species occurrence dataset that I just can't ...
ChloeM's user avatar
  • 11
1 vote
0 answers
54 views

"no data" result from raster calculator

Am trying to implement the following line in QGIS raster calculator: ("L@1" < 0) * ((1 - 16 * 200 / "L@1")^0.25) + ("L@1" >= 0) * 1 Basically, when L is less than ...
Apeny's user avatar
  • 11
1 vote
1 answer
987 views

Why is GeoServer 'Layer Groups' not opening?

I want to create a layer group in GeoServer, but when I click on the layer group I get the error below. I am logged in as an admin, I'm not sure if this has to do with my setup? An error occurred ...
Magali Gonçalves's user avatar
1 vote
0 answers
253 views

put marker on a vector layer / map Qt-Qgis

I am designing a GUI using Qt and QGIS and showing maps (shapefiles - Vector layers) on the GUI. I want to put a marker on the vector layers when I click somewhere on the map. I could get coordinates ...
kry23's user avatar
  • 93
1 vote
0 answers
19 views

Is there an equivalent term to 'imagery' in context with maps and cartography?

Is there an equivalent term to imagery in context with maps or cartography? Mappery seems not to exist. (I'm from Germany, and some miles away from being a native-English speaker) To explain that a ...
jaysigg's user avatar
  • 497
1 vote
0 answers
510 views

Batch adding of SEGY files to QGIS

I am working with a set of legacy Archaeology GPR data that contains a massive batch of .segy files. Each file has multiple layers forcing me to "Select Vector Layers" to add. Is there a way ...
Noah Chapman's user avatar
1 vote
0 answers
1k views

How to query a specific layer from a feature service?

I am trying to get the list of feature service which has a specific layer (for example: River (the layer id is 0)) from a feature service, from arcgis.gis import GIS gis = GIS(url='https://pythonapi....
Aravinth's user avatar
1 vote
1 answer
85 views

Measuring flight activity (in vector lines) of bird within boundary using raster analysis

I need to find out the time a bird spends in different areas within a windpark. I have a shapefile (flight lines) with the following attributes: "presence" is always = 1, the times ...
Chente's user avatar
  • 19
1 vote
0 answers
77 views

GeoPDF added into QGIS gives a broken raster; GeoReferencing it gives an invisible output

I've been attempting to add a GeoPDF to my QGIS 3.16.14 project. The PDF is available here: https://reliefweb.int/sites/reliefweb.int/files/resources/reach_irq_map_mosul_city_reference_08nov2017.pdf ...
Grigor Marku's user avatar
1 vote
2 answers
72 views

Which quantile calculation method(s) does GRASS-GIS use?

Per Wikipedia , there are 9 common methods of calculating quantiles in common use across various statistical software packages, as well as languages like R and Python. Various other custom ...
obrl_soil's user avatar
  • 3,732
1 vote
0 answers
195 views

Two layers have the same projection but different units

Two of my layers aren't aligning even though they're in the same area and use the same projection system. I am not sure why they won't align but I think it is maybe because they have different units ...
ale19's user avatar
  • 452
1 vote
0 answers
111 views

Setting mesh layer visibility in QGIS application?

I am utilizing the QgsMeshLayer class to load a NetCDF file that contains multiple variables (temperature, velocity, etc). I want to be able to set the visible dataset by variable name. I know how ...
skew_t_pie's user avatar
1 vote
0 answers
125 views

Configure layer in MapServer 7.2 with 2 dimension (time and depth)

I am trying to configure MapServer in order to serve a vector layer with 2 dimensions (time and depth) using a tileindex shapefile. In the mapfile I define the main layer and the tileindex layer as ...
Giuseppe's user avatar
1 vote
0 answers
660 views

QGIS 3.22 incorrectly displaying raster layers

Today, QGIS 3.22 incorrectly displays raster layers - by which I mean significantly in the wrong place and at the wrong scale. Moving the map with hand and zoom tool shows inconsistent updating (by ...
ActionEcologist's user avatar
1 vote
0 answers
359 views

Cluster & Average linestring based on similarity

I am looking for a way to find the "average" linestring of a set of linestrings using postgis 3. Ideally the collection of linestrings should be clustered based on their similarity (Perhaps ...
Muldyr's user avatar
  • 11
1 vote
0 answers
3k views

How to map 9-digit ZIP (ZIP+4) codes to census tracts?

The U.S. Department of Housing and Development provides a crosswalk between standard 5-digit ZIP codes and census tracts. This is a hard problem, as neither set's units are contained in the others'. (...
László's user avatar
  • 379
1 vote
0 answers
512 views

What units are the stream initiation threshold in the SAGA channel network plugin in QGIS 3?

I am using Qgis 3 and creating a Depth to Water (DTW) model and I am using NAD83 UTM 20. One of the steps in the creation of this model is delineating a stream network. In order to do so, I need to ...
Erioderma's user avatar
  • 535
1 vote
1 answer
211 views

Classify pixels using deep learning is giving wrong result for Landsat-7 data in ArcGIS

I am trying to classify two LULC maps from two data. One is for 2020 (Landsat 8), and another is for 2000 (Landsat 7). The pixel depth is 64-bit and both of the data were downloaded from Google Earth ...
Mhasan502's user avatar
1 vote
0 answers
186 views

Adding a layer by URL without knowing the layer type In the ArcGIS API for JavaScript

We are providing a service with a map using the ArcGIS API for JavaScript. One of the features that we want to provide is the ability to add any web hosted map layer to our map as a map overlay. When ...
TJR's user avatar
  • 1,612
1 vote
0 answers
474 views

Export QGIS layout as georeferenced PNG image with PyQGIS

I am using PyQGIS to export a map layout like this exporter = QgsLayoutExporter(layout) settings = exporter.ImageExportSettings() settings.dpi = 100 path = 'C:/data/test1.png' exporter.exportToImage(...
JUNGLE's user avatar
  • 510

15 30 50 per page
1
249 250
251
252 253
762