All Questions
160,459
questions
0
votes
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answers
3
views
Populating an HTML table in QGIS print layout with data from multiple layers using Atlas coverage layer
I am working on a QGIS print layout where I need to populate an HTML table with data from different layers. I have set up an Atlas coverage layer and I'm using @atlas_featureid as a filter to retrieve ...
- 1
0
votes
0
answers
4
views
GDAL Rasterize over attribute (rewriting raster issue) in QGIS
I'm trying to process gdal:rasterize_over in QGIS Python console. The same problem persists - this function is rewriting the input sample raster instead of making a new one as output. I've tried (look ...
- 1
0
votes
0
answers
5
views
Converting geodetic coordinates to ENU coordinates
I am trying to understand conversion from geodetic coordinates to ENU coordinates. As per this wikipedia page, its two step process: geodetic to ECEF coordinates and then ECEF coordinates to ENU ...
- 101
0
votes
0
answers
25
views
Crash when using Join Attribute by Location with largest overlap
I have this error. I checked that all my segments have an area greater than 0.
Process goes to 8% then this error happens.
What can I do to fix this?
Python Stack Trace
Windows fatal exception: access ...
- 101
0
votes
0
answers
4
views
Adding marker to folium map inside thread using streamlit
Using the following code I am trying to add marker to folium map inside thread on webapp using streamlit.
import streamlit as st
from streamlit_folium import folium_static
import folium
import ...
- 606
0
votes
0
answers
9
views
OpenLayers map rendering issue in Next.js 13 using TailwindCSS on a page with sticky header and footer
I am building a web app using Openlayers in Next.js 13 with TailwindCSS. I am encountering a issue/bug with rendering the base map inside a page with a sticky header and footer. The map has scrollbar ...
- 1
0
votes
1
answer
28
views
Interpolate a GeoJSON file
I have a GeoJSON file which consists of rainfall data in a location.
I want to interpolate those point data in GeoJSON and make a raster file, and display in Leaflet map. How can I do this?
0
votes
1
answer
34
views
What coordinate system does QGIS's Advanced Digitizing tools use and how can these be changed?
I want to draw a point at a specific location (set of coordinates) for a map. I have read other answers and QGIS documentation on how to use the Advance Digitizing tools / panel and figure I ...
1
vote
0
answers
16
views
PostGIS selecting points using a subset of lines using ST_DWithin
I'm not sure why this script sends a much higher count than the real number. This one sends 2314 points, which the answer should be 114
I can get the correct value by either dissolving all the ...
- 83
1
vote
1
answer
38
views
Quickly convert point features to raster using ArcPy or GDAL
I have a very large point feature collection, about 40 million points, which are obtained by raster conversion, so the arrangement of points is regular (the distance between two columns of points is ...
- 13
0
votes
1
answer
12
views
format numeric values with preceding zero(0)
how to format number e.g 1 to 01 in javascript .
my target is to loop over every month of the year. if I hard code _0 then 10,11 and become 010,011,012. kindly response.
for(var i=2020; i<2021 ;i++)...
- 43
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votes
0
answers
8
views
leafsync strange behaviour - duplicate maps when syncing two different maps
I have a bizarre thing going on with leafsync::sync. I have two maps generated using mapview function in r. The underlying data is in sf format
map1
map2
As you can see they are two different maps ...
- 459
0
votes
0
answers
11
views
Simple method to display thumbnails of a list of polygon on a satellite map layer for each polygon drawn by user
I have a web application displaying a Leaflet satellite map using simple JavaScript on the client-side and Flask on the backend. I have given the user ability to create polygons on the map which are ...
0
votes
0
answers
30
views
What is the math behind shapeburst fill?
I'm talking about this: https://plugins.qgis.org/planet/tag/gradient/
I wanted to understand how it calculates the distance to the closest edge.
- 11
0
votes
0
answers
9
views
Arcgis online - how to create store locator
I would be interested to know who to create store locator map in ArcGIS online, similar to that in Google Maps, where there is a left sidebar giving details of the locations with images/text attached ...
1
vote
1
answer
100
views
Planar vs geodesic
My understanding is that geodesic is measured on the surface of the ellipsoid and is the always the shortest distance on the earth. Planar is just straight line distance. Is this the correct ...
- 11
0
votes
0
answers
11
views
Layer error: Image.constant: Parameter 'value' is required. Google Earth Engine
I tried to do Sentinel 2 level 1C atmospheric correction with the SIAC algorithm, but got the error
Layer error: Image.constant: Parameter 'value' is required
What's the solution?
This is my code:
...
0
votes
0
answers
18
views
How to retain unique ID in QGIS while running Least Cost Distance?
I have to find the least cost distance from Junnar (19.209280, 73.872589) to a list of 207 points using the Least Cost plugin on QGIS (https://plugins.qgis.org/plugins/leastcostpath/).
My raster is ...
- 1
0
votes
0
answers
29
views
QGIS Attribute Visibility Issue - Only 6 Attributes Visible on Map
I'm facing an attribute visibility issue in QGIS, and I'm hoping someone can help me troubleshoot it. Here are the details:
I have a layer in my QGIS project with a total of 99 attributes in the ...
0
votes
0
answers
41
views
Accessing previous algorithm outputs in QGIS graphical modeler
I want to extract features by expression in a graphical model in QGIS. I want to use the overlay_touches() function to extract features that touch those of another layer.
I manage to do this "...
- 559
0
votes
0
answers
21
views
How to apply an SLD containing WKT to symbology in QGIS?
I have an SLD symbology code in GeoServer
Here's how it looks in GeoServer.
<se:Rule>
<se:Name>Single symbol</se:Name>
<se:PolygonSymbolizer>
<se:Fill>
<se:...
0
votes
0
answers
25
views
Remove marker from folium map
With the following code I am able to add marker to the folium maps:
import folium
import time
m = folium.Map(location = [13.0, 77.0], tiles=None, zoom_start = 5, control_scale = True)
img_path = '...
- 606
0
votes
0
answers
23
views
Way to turn a RasterStack into a SpatVector in R
I have a RasterStack with 2 layers. I am using an R package that requires only SpatVector objects. Using the layers separately is not really an option since I want their combined effects. Would there ...
- 23
0
votes
0
answers
8
views
Trouble with Google Earth Engine - cannot identify why chart is not generating - no features contain non-null values
Having some issues in GEE - it continuously states:
Error generating chart: No features contain non-null values of "system:time_start".
However, there are plenty of images that it could draw ...
- 1
0
votes
0
answers
20
views
Understanding ECEF, WGS and NAD coordinate systems
I am trying to understand different definitions related to different coordinate systems in GIS.
Wikipedia says following about Earth Centered Earth Fixed coordinate system (ECEF):
The Earth-centered, ...
- 101
-6
votes
0
answers
29
views
I want to download Route map of Trans-Asian Highway Network [closed]
Need help in EIA Report Trans Asian Highway Network.
I want to download route map of Trans-asian Highway Network.
How can I proof the EIA Report is Correct?
Suggest me some ways and Explain how to do ...
-1
votes
0
answers
33
views
Computer does not have enough available memory [closed]
I tried running a least-cost distance plugin on ArcGIS but an error keeps popping up:
The computer does not have enough available memory to perform the operation.
I ended all background apps until ...
- 1
0
votes
0
answers
20
views
How to get current (selected) tool from toolbars (map navigration tools & object selection panel) and change it in code [duplicate]
I'm developing a plugin for QGIS, and for further implementation there should be logic that automatically switches current tool to 'select objects', and, after selection, returns to the previous tool.
- 1
0
votes
0
answers
7
views
Finding a common point with ArcGIS REST API
I perform trace operation with ArcGIS REST Service using Python in the Geographic Information System I use for the electricity network, as a result of this process, I can find which transformers a ...
- 1
0
votes
1
answer
9
views
How to annotate features in google earth engine?
I have a CSV file with ID, X, Y, NAME and ZoomLabel. I have been successful with putting the Point Feature on the map.
Now I am trying to annotate the locations with the NAME field.
I used the ...
0
votes
1
answer
35
views
Minimum spanning tree (MST) over a set of POINT geometries
I have 3 columns in my table: centerPoint (point), uuid (string), and "areaID".
Each areaID can have multiple uuid's, and each uuid has a corresponding centerPoint.
I want to calculate the ...
- 801
0
votes
0
answers
10
views
Matching coordinates to the closest raster in a stack by date in R
I have downloaded NDVI rasters from luna::getModis, and assigned each raster layer the appropriate date. This was then converted to a rasterstack. I also have a dataframe with coordinates and date.
I ...
- 1
0
votes
1
answer
12
views
GEE error: Unable to compute error margin in invalid area of projection (EPSG:32750: ........0))
i tried to visualize the regression from random forest, but it cannon appear in console or map, the variable predictor has been export by same scale and crs. why this is happen?
// Display the input ...
- 11
0
votes
0
answers
41
views
Units of length
I've created a shapefile with polylines drawn. How do I measure the length of the lines. I've tried changing the units of distance (in Settings->Options->Mapping Tools->Preferred distance ...
1
vote
0
answers
31
views
Recursive nearest neighbour to find shortest route
I am trying to find the shortest route using resursive nearest neighbours. Here is my code:
with RECURSIVE NearestNeighbor AS (
SELECT
a.uuid AS from_area,
b.uuid AS to_area,
...
- 801
0
votes
2
answers
49
views
Create new layer in QGIS using SQL query
This is a related question to: Speed up performance of virtual layer based on GeoPackages in QGIS
In that question, I was trying to use a virtual layer in QGIS (3.30) to add a region field to a suburb ...
- 2,485
0
votes
1
answer
18
views
Enabling render type for Mapzen Global Terrain in QGIS
I'm trying to change the color ramp on a Mapzen Global Terrain layer and only 'Singleband color data' is available in render type. 'Singleband pseudocolor' is not available. This is occurring in QGIS ...
- 3
0
votes
0
answers
23
views
Reverse linestrings, given attributes
I am working with street numbering and toponymy and I have an issue in hands:
Given some data provided by an Institution, i.e.:
points as door numbering and
lines as the streets
Those streets were ...
- 1
0
votes
0
answers
7
views
Feature display option 'Only show features visible on the map extent' suddenly disappeared from ArcGIS Pro
Feature display option 'Only show features visible on the map extent' under legend in the layout suddenly disappeared from ArcGIS Pro. What went wrong and how to get it displayed again?
- 139
0
votes
0
answers
6
views
Files for synchronizing project not apearing
I'm trying to synchronise (upload) alterations (new fields) from QGIS to Qfield. They were sychronising fine and then now it seems to freeze and either only a few of the files (the newly created ones) ...
- 1
0
votes
0
answers
23
views
Error during Field Calculation in ArcMap
I am digitizing a map from a JPEG file and while digitizing I have field named block when I apply field calculator for some selected polygons it shows this error
000732 error: Input table: Dataset ...
- 1
0
votes
0
answers
22
views
API to programatically render an image from an arbitrary perspective (lat, long, altitude, bearing, pitch, roll)
In Google Earth, I can manually navigate to a given position, and I get a nice image rendered for me from their underlying 3d model.
I want to get this image programmatically. Is there any API/...
- 101
1
vote
1
answer
15
views
Iterating through las directory using lidR in R results in not finding file or not recognising file as .las
I am trying to produce a script which has functions that can produce a list of statistics and writes them to data.frame, which can in turn be written to a csv file if needed. This would be to check ...
0
votes
0
answers
22
views
Should Fill tool be used even for Slope or Aspect?
Is it necessary to use the Fill tool on a DEM before using the Slope or Aspect tool?
- 175
0
votes
0
answers
11
views
How to use Python to update enterpise geodatabase user connections for layers within an ArcGIS Pro Project map
I tried to use the following code to update the connected database user for layers within an ArcGIS Pro project map. The code runs but it does not change the data sources from one enterprise ...
- 19
1
vote
1
answer
100
views
Delete default shadow's points in QGIS
I didn't find in QGIS documentation how to solve this and not on this site either.
I am applying a color graduation for my point layer with a simple symbology.
How to delete this shadow?
It has ...
- 75
1
vote
1
answer
26
views
Join non-spatial CSV layer with spatial shape layer, using multiple input fields
I have two separate layers i want to join in my QGIS-project based on multiple matching input fields.
One layer consists of a non-spatial CSV table, but with the matching fields: Streetname, House ...
- 13
0
votes
0
answers
12
views
Setting the raster opacity by another raster value
I have a raster with the result from a linear regression and another raster with the R² of each regression. I want to set the opacity of the first raster by the value of the R². Is this possible? Do I ...
- 1
1
vote
0
answers
26
views
On an Android smartphone, where is stored in QField, a project brought back from the cloud
Where are QField projects synched through the cloud stored on an Android smartphone?
- 51
0
votes
2
answers
46
views
Efficiently removing smaller polygon of overlapping multipolygons [closed]
I have a geodataframe containing around 5000 shapely mutipolygons. Each of these multipolygons contains 2-10 polygons. Some polygons overlap with polygons of other multipolygons.
gdf = geopandas....
- 1