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pgrouting or recursive question?

For a water network, I'd like to count the users and accumulate them. I look at Here's what I've got: and I'd like to get (done by hand): however, with a recursive query, I'm afraid of counting ...
pasqal's user avatar
  • 538
1 vote
0 answers
14 views

Why does my raster look different after clipping it by a mask layer using QGIS?

I have a Digital Elevation Model of Europe and I want to clip it to the extent of Germany. To do so, I am using Clip Raster by Mask Layer with the external frontier of Germany as the mask layer. ...
Jama's user avatar
  • 65
0 votes
0 answers
13 views

CDO combined commands not working

I am working in R and have netCDF files that I need to pre-process beforehand. One file can be downloaded here: https://drive.google.com/file/d/14tbMvFaYSvHpDWTOdbSSdverkowEhNyV/view?usp=share_link ...
Mtrs's user avatar
  • 1
0 votes
0 answers
12 views

Trying to find zenith and azimuth angles to satellite

I am working with satellite data. Each scene is approximately 30km squared with 1024 * 1000 pixels. I have the zenith and azimuth angle for each of the four corners, plus the center. I have latitude ...
sil's user avatar
  • 119
0 votes
0 answers
19 views

Cannot load a geodataframe (from a shapefile) into PostgreSQL (as table) via SQLAlchemy

I would like to publish a shapefile from a directory to GeoServer by using the Python library geoserver-rest. I understand that in order to do so, I need also to load the shapefile as geodataframe (...
Tms91's user avatar
  • 185
0 votes
0 answers
27 views

Stitching geotypes into a mosaic [closed]

How can I stitch satellite images using python, making the image connection borders invisible? I am surprised, but there is still no ready-made solution for gluing a mosaic of typhus with adequate ...
Кирилл Ярков's user avatar
0 votes
0 answers
14 views

How to get the shortest distance between polygons from the same layer? [closed]

I need to know the shortest distance between polygons of the same layer. NNJoin crashes I also tried Join attributes by nearest but the numbers don´t seems to match the real distance between polygons
Joaquín Mazarino Rodriguez's user avatar
0 votes
0 answers
13 views

How to maintain single band in raster export in QGIS

I'm working with a LiDAR DEM hosted on a server and I want to generate contour lines from it. I'm trying to 'Export -> Save As' to create a GeoTIFF, but the output that's created is a 4 band (RGBA) ...
oucil's user avatar
  • 103
0 votes
0 answers
18 views

MapTool in Processing Provider Plugin

I created a simple plugin using the Plugin Builder and placing the "Tool button with a dialog" option, however, as I added more things to the plugin, I saw the need to place it as a ...
Mestrexama's user avatar
0 votes
0 answers
27 views

QGIS Form: The SUM field is not populated as expected

I created a form in QGIS to collate the data from a created points layer. In this layer, I am trying to sum the values from Field_A grouped by Field_B and Field_C. I used the following expression: sum(...
DanReev25's user avatar
0 votes
2 answers
32 views

How to find a list of polygons from one layer that intersects a polygon in another layer

I have two layers with polygons. Layer A has polygons that are contiguous and cover the entire geography. Layer B has individual polygons that are not contiguous and intersect more than one polygon ...
sudeten's user avatar
  • 11
2 votes
0 answers
20 views

gdaldem hillshade leaves holes in map at hill shadows

I have followed the install guide for OpenTopoMap exactly, this can be found here: https://github.com/der-stefan/OpenTopoMap/blob/master/mapnik/README.md#compile-and-install-mod_tile When I view the ...
Davin Hansen's user avatar
-1 votes
0 answers
19 views

Popular touristy places in searched country

I am building a travelling app in react and I need to create a fetch function for fetching data about the most popular tourist attractions in searched country I want to pass countryName as parameter ...
Anar Talibov's user avatar
0 votes
0 answers
36 views

Soften/round edges of raster layer [closed]

I have a raster layer with ocean depths in 50m sqaures. I would like to soften / round the edges of the pixels to look more like a vector. This image shows the look I'm after I only want to edges to ...
Asger Mogensen's user avatar
-1 votes
0 answers
32 views

Phantom points in QGIS

I am using QGIS 3.26.2-Buenos Aires. I have two phantom points at all layer levels, and at no layer levels. I tried the text icon to remove them, but that failed. All layers are turned off and they ...
Noel Preece's user avatar
0 votes
0 answers
22 views

Shapefile looks good in GeoPandas, but when opened in ArcGIS Pro rows are filled with incorrect inputs [closed]

I am fairly new to ArcGIS and GeoPandas. In Jupyter Notebook I wrote a function that would take all the ".shp" files in one folder and clean them (removing unnecessary columns, groupby, sum,...
gow boi's user avatar
3 votes
1 answer
69 views

Default QGIS style symbologies not displaying

I have been installing and uninstalling QGIS (different versions) yet they are not displaying features symbols/styles in the symbology. I am using a HP ELITEBOOK core i7, 8 gen, Windows 11. What might ...
Ndevashiya Simon Kulaumone's user avatar
0 votes
0 answers
12 views

QGIS specify map units for a document that does not have a projection defined

I have a QGIS project that does not have a coordinate reference system defined. This is deliberate, as I am working in a simple cartesian x,y model. The units of layer files are meters, and I want to ...
SJC's user avatar
  • 1
0 votes
0 answers
12 views

GEE outputs different number of groups for each year when performing grouped area calculation in GEE

I wrote a function that aims to calculate the pixel area of each of 19 land cover classes within a masked image's area (MODIS burned area). I mapped the function over 20 years of land cover and burn ...
KatieGeo's user avatar
0 votes
1 answer
11 views

Water System Modeling: Snap Line-to-Point, or Line-to-Line?

I would like work on setting-up our water distribution system in a way that will allow for the utilization of water modeling, i.e., leak detection. I believe that in order to do this, certain rules ...
CatchE's user avatar
  • 3
-1 votes
0 answers
24 views

Rotating a set of GPS coordinates around a point

I have little idea what GIS is, and I have no experience using it. However, this is a question I'm asking here because it seems like the best place for an answer. I have a land deed from 1971 ...
Eli Williams's user avatar
1 vote
1 answer
32 views

How can I further clean fix geometries if the tool doesn't fix them all?

I'm trying to clean up a spatial file (a constituency map of France) to then use in Tableau. I used the "fix geometries" tool to fix most of the issue, but there are still several ...
Amber's user avatar
  • 11
0 votes
1 answer
19 views

How to use qgis2web - first time using

Stewart Galloway, [Jul 12, 2024 at 8:11:18 AM]: Hi all. I'm trying to use qgis2web for the first time and have not gotten too far. Can you point me to instructions/how-to pages? Here's what I've ...
yorkmapper's user avatar
0 votes
0 answers
21 views

Sublayer from a Geopackage file shows as geometrytype 0 (unknown), but it contains points. It doesn't show the points either. How do I fix this?

I have geopackage file that contains sublayers that containts points. I want to access the sublayer and create a new file of it. Despite the points it shows the geometry type as unknown. The points ...
user103858's user avatar
1 vote
1 answer
42 views

Finding the right Projection/CRS for a 2000's era shapefile of Bosnia Herzegovina

I have been looking for a historic soil map shapefile of Bosnia & Herzegovina for a while and finally found one - a UN FAO project archive had the files available, albeit designed for ArcView. The ...
Needs_Caffeine's user avatar
0 votes
0 answers
14 views

Algorithm for catchment delineation with equal size basins

I am looking to delineate catchment areas of roughly equal size at specified outlet points along a channel. I need something that adds preference to capturing the floodplain on either side of the ...
Rob's user avatar
  • 183
0 votes
0 answers
15 views

Import ECW file

is it possible to add an ecw file as a data source? I have the gdal extension installed: Module Name: ImageI/O-Ext GDAL Coverage Extension Module ID: gs-gdal Version: 2.24.2 Component: ...
Rezorl's user avatar
  • 1
0 votes
0 answers
26 views

Sentinel-2 QA60 band missing?

When performing cloud masking for Sentinel-2 images using QA60 band, I found that after February 2024, the QA bands of Sentinel-2 images are all "masked". In this case, I can't perform cloud ...
Chang Zhou's user avatar
2 votes
1 answer
50 views

QGIS (qgis2web) automatically update data set

I am working on a QGIS Map with location data. My goal is to create a web-map (intern server - not public) with my QGIS Map. My data gets updated reguarly. Currently I am working with qgis2web plugin. ...
Kilian's user avatar
  • 21
1 vote
0 answers
21 views

Drainage area at a point of my choice

I want to get drainage areas at specific points (the points are places I want to put culverts for a railwork construction). The thing is that when I run either upslope area or PCraster tools, the ...
dimitris fotopoulos's user avatar
0 votes
0 answers
34 views

How to get latitude and longitude from mouse click in a QGIS plug-in

I am using OSM with CRS EPSG:3857 as default. The following code works (using Getting coordinates from mouse click in QGIS3 in a plugin as a starting point), in that it returns a coordinate-pair that ...
Nick's user avatar
  • 123
0 votes
1 answer
21 views

Optional argument has wrong value when used with action trigger

QGIS 3.36.2, Python 3.12.3 I've got a regular action that is part of a toolbar and that calls a function when pressed, which uses an optional argument with a default value: class MyClass: def ...
Neph's user avatar
  • 235
0 votes
0 answers
30 views

Sorting orders of layers for presentation

This is basic functionality that I use often but cannot get it to work on a particular project. QGIS 3.16. I have three symbology rules on a layer. The 'sub' layer(rule) that should be on top keeps ...
Sean's user avatar
  • 51
0 votes
0 answers
22 views

QR-Code with location and via

By now the use of 'geo:' with decimal latitude and longitude appears to be fairly well accepted, even if some services would prefer you to use their proprietary encodings. Hence something like ...
Mark Morgan Lloyd's user avatar
2 votes
1 answer
32 views

Showing azimuth/heading of points as arrows

I am trying to display a set of points as arrows that point towards the direction given by a known angle (in my case, the angle is the geometric heading, i.e. counterclockwise from East, in radians). ...
louisbzk's user avatar
1 vote
0 answers
19 views

How to eliminate flow streams?

I work via the Qgis modeler with SAGA algos on flows from DEM to determine the watershed at a given outlet. I know how to get the watershed (capture1), I know how to create an obstacle to flow and ...
fcka's user avatar
  • 985
0 votes
0 answers
13 views

FME: Create a copy of a GDB (Writer) and rename it after the Reader/Input (ITF)

Reader: ITF (abc.itf) Writer: GDB (original.gdb) I am reading an ITF File (abc.itf) and then write in an empty FGDB (original.gdb). How can I create a copy of the FGDB with the name of the ITF (abc....
Theodora's user avatar
  • 171
0 votes
0 answers
23 views

Reduce raster file size during QGIS Python script processing

I wrote a Python script based for QGIS that is using the raster calculator to create a new raster based on two existing raster inputs. My problem is, that each output file is 35 GiB and I do have not ...
ScienceNoob's user avatar
0 votes
0 answers
16 views
+100

Automatically navigation graph creating

I am recently intrestring in Indoor Mapping, and I came across Mappedin, whose innovative work particularly their data format and SDK impressed me. One of the features of Mappedin is its capability to ...
giser's user avatar
  • 761
0 votes
1 answer
42 views

Creating derivative layer based on other layers in QGIS

Let's say I have multiple vector layers in QGIS, and their fields are as follows: Layer 1: ID NORTHING EASTING ELEVATION NOTE Layer 2: PID SPC_NORTHING SPC_EASTING Z_NGVD29 COMMENTS Layer 3: POINT ...
destruct50's user avatar
0 votes
3 answers
18 views

Why does SLD apply two Rules

I got three Rules: <Rule> <name>rule1</name> <ogc:Filter>....</ogcFilter> <Symbolizer/> </Rule> <Rule> <name>rule2</name> <...
Beettle Juice's user avatar
0 votes
0 answers
31 views

Create shapefile using fiona geopandas succeed but no feature created

From my script I want to create a shapefile from object detection, when the file is small or medium size (under 150.000 features) its workable, but when it more than that value, the feature is null in ...
Ari's user avatar
  • 1
0 votes
0 answers
22 views

QGIS - Geometries constantly in error

I m doing a lot of polygon editing in QGIS for a mapping project (matching polygons up to aerial photo patterns) - mostly by manually moving nodes, using the Merge Selected Features and the Split ...
Astrebla's user avatar
0 votes
0 answers
10 views

How can I apply <ogc:And> inside <ogc:Function name="if_then_else">

The example: <CssParameter name="fill"> <ogc:Function name="if_then_else"> <ogc:And> <ogc:Function name="greaterEqualThan"> &...
Beettle Juice's user avatar
0 votes
0 answers
16 views

WGS84 elevation from ALOS 30m DSM tif's using rasterio

I am new to GIS processing. I am trying to compute WGS84 elevation for given latitude and longitude using the JAXA ALOS 30m DSM. I use rasterio and code from a minimal example I found that looks like ...
Francesco Callari's user avatar
-1 votes
0 answers
24 views

Survey identified monuments but encroachment occurred in the middle [closed]

I had a survey completed for a property line dispute. He verified the monuments were found and for the most part align. The neighbors agreed to replace the fence and we agreed. However I see were they ...
Julia Durand's user avatar
0 votes
1 answer
32 views

How to generate points along a line beginning at a random distance from the endpoint in ArcGIS Pro

I am working on a scientific survey that requires a specific number of transect points to be generated along shorelines (polylines). I have a featureclass with the entirety of an area's shoreline ...
Szechwan's user avatar
0 votes
0 answers
15 views

Tiles missing in export of A3 sized (scale 1:25,000) OpenTopoMap!

I'm trying to export a map (OpenTopoMap) of size 4960x3507px (300dpi, A3-format), but it doesn't seem to work. It does when setting the resolution to 100dpi. Higher resolutions don't work; each try ...
user249383's user avatar
0 votes
0 answers
21 views

Color Bands Not Running From 0 to 255 as Expected in RGB Tiff

There is a Colour Tiff in ArcGIS Pro. This is produced by an extract from a WMS Service of the Ordnance Survey 1:25k Explorer Map: https://ukmapcentre.com/explorer-maps-25000-scale/. The extract is ...
acolls_badger's user avatar
0 votes
0 answers
15 views

Issue with Iteration/Unique Naming in QGIS Model Building

this is probably a straightforward problem, but I am a beginner at QGIS and having trouble fixing it. The Task I am trying to use a vector of polygons as masks to individually cut out snips of a ...
lGISmor's user avatar

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