All Questions
156,766
questions
0
votes
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answers
3
views
Is there a standard co-ordinate frame reference when computing point clouds from depth maps?
For example, if I use OpenCVs reprojectImageto3D method vs Open3Ds createPointCloud method?
0
votes
0
answers
9
views
Best Way to Work with Large Vector Data Files
I am about to start making 50+ maps for my next book project. The last 2 books were a struggle with the huge amount of Ontario, Canada vector data to make my basemaps.
These were large files from the ...
- 125
1
vote
1
answer
12
views
Using Software to Download Shapefiles vs Manual Downloads
I am new to geospatial analysis and am trying to self-learn about this topic.
I learned that the core of geospatial concerns itself with analyzing "shapefiles" - these appear to be ...
- 11
0
votes
1
answer
12
views
Discover projection of a shapefile
Some shapefiles with data supposed to be located in Michigan, USA, were sent to me.
The attribute table shows coordinates such as :
X Y
1929418 287864
1467373 543238
I ...
- 135
0
votes
0
answers
4
views
QGIS Generate XYZ Tiles from WMS Source, output is distorted?
I'm using a WMS source map from here:
https://geoserver9.esdm.co.uk/OrdnanceSurvey/wms?VERSION=1.1.1&TRANSPARENT=true&LAYERS=OSLicensed2&TILED=true&SRS=EPSG:27700&WIDTH=256&...
0
votes
0
answers
6
views
Finding the nearest named highway way id
Given my location (in Bochum city, Germany), I am trying to identify the nearest highway way id by using the following Overpass API query:
[out:json][timeout:180];
area[name="Deutschland"];
...
- 103
0
votes
0
answers
9
views
Scheduled geoprocessing task failing in ArcGIS Pro
I'm new to ArcGIS Pro and am using v2.8 on a VM. I tried scheduling two Model Builder models to run over night every weekday, however, the geoprocessing history doesn't show that the models are ...
- 721
0
votes
0
answers
7
views
Error upgrading GeoServer from 2.7 to 2.18
I had a GeoServer version 2.7 on a Windows machine. I wanted to upgrade it.
I backed up the data_dir and then pasted it into the data_dir of the new GeoServer.
When I log into the new GeoServer admin ...
- 599
0
votes
0
answers
7
views
'Error reading object gs://...' when exporting map tiles from GeoTIFF loaded from Google Cloud Storage
I'm getting the error in the title intermittently when exporting map tiles using the nodejs Client Library where the image being tiled is loaded from ee.Image.loadGeoTIFF(). The first work unit (of ...
- 31
1
vote
1
answer
11
views
How to substract buffers of identical ID in R (terra)?
For a research project, I need to define treated and control areas around land parcels, located by coordinates and uniquely identified by an ID. The treated areas consist in disk-shaped buffers around ...
- 13
0
votes
1
answer
11
views
Join attributes by location won't sum values in QGIS
I am trying to average all the data for one attribute in a particular census tract from the road segments data that lies inside of them. The documentation states that you can sum average etc. data by ...
- 1
0
votes
1
answer
15
views
Optimizing GeoServer
I'm beginner in geomatics, and I have created a web mapping. I use GeoServer as server of data WMS. My layers is stocked in PostgreSQL and I have optimised this and the styles. Now I want optimize ...
- 1
0
votes
0
answers
10
views
Group a specific script in the Processing Toolbox
I use a script from the excellent plugin geometric_attributes for use it in a stand-alone process (his function named Centerlines). It works like a charm, good.
But I can not move it in my own custom ...
- 11
0
votes
0
answers
4
views
Type the max number title in Excel
I want two fill land type with column a , b , c , d. If A is greater then all 3 then type A or if b is greater then A, C and D then type B or if c is greater then A, B and D then Type C or if D is ...
0
votes
0
answers
12
views
The output of PySEBAL is not reasonable
I was running PySEBAL model and I examined the output of the actual ET, I found too many (no-data) pixels which I know it is wrong from the sat image at the same date (see the attachments)
PySEBAL ...
0
votes
1
answer
13
views
Imported raster file becomes grainy/distorted when plotting with R
I'm pretty new to GIS stuff, and I'm trying to incorporate some map rasters into my plots of sampling locations in R.
I've got a fairly high-resolution geo-referenced .tif of the area I want to plot. ...
- 101
0
votes
0
answers
27
views
How to get the type of a layer in QGIS processing
I want to make a QGIS processing script that adapts to the type of the input layer (vector or raster). The script will then use different tools depending on the type of layer. When testing the type, ...
- 1
0
votes
0
answers
14
views
Calculate the area of individual pixels after clipping an image to a region of interest in Google Earth Engine
I have a defined area of interest, to which I have clipped the image I would like to use for analysis. However, I would like to exclude the partial pixels that result from clipping the image. The way ...
- 1
0
votes
0
answers
8
views
Reset the style and colors on polygon in Google Earth Pro
I was practicing using the polygon feature in Google Earth Pro following this guide here:
https://www.google.com/earth/outreach/learn/annotating-google-earth/#add-polygons-3
But now I want to reset ...
- 101
-3
votes
0
answers
16
views
Intersection of geographic coordinates [closed]
I want to program the following problem with C#.
Two people are located in two coordinates and are radiating lasers. Person a person b Each person has the his latitude and longitude and is located at ...
0
votes
1
answer
9
views
How do I use the GDAL raster calculator in QGIS to calculate P using conditional equations based on pixel values in another layer?
I am trying to calculate PNET (net precipitation) values using the GDAL raster calculator in QGIS. However, I want to use different equations depending on the pixel values in another layers that I ...
2
votes
1
answer
14
views
SRID value=0 in geometry_columns for a view that explicitly uses ST_SetSRID
PostgreSQL 15.2, PostGIS 3.3.2
I create a view which has geometry column composed of raw coordinates. I explicitly set the SRID. However, in geometry_columns view the SRID value is 0 for that view. ...
- 21
0
votes
1
answer
10
views
Python: Converting PNG to GTiff increases file size
Im running this script to convert PNG to GTiff and tag it with coordinates and a crs of my choice. It works just fine but after the conversion the geotiff file is 177 MB (the png is 1 mb or smt) and ...
- 1
0
votes
0
answers
6
views
Magnetic North in topographic north arrow and dynamic text "magneticDeclination" in ArcGIS Pro is not similar
Magnetic Declination in the topographic north arrow is correct (I`ve checked it by World Magnetic Model), but when I add dynamic text "magneticDeclination" it has difference for 2 minutes. ...
1
vote
0
answers
25
views
How do I change the tile type for one area of the map?
The whole map has a TileLayer = 'OpenStreetMap'. How to change the Title Layer only for the area indicated by the polygon?
import folium
X1 = 61.70029083832628
Y1 = 27.24609375
X2 = 61.68987220046
Y2 ...
- 11
-1
votes
2
answers
40
views
Which version of Python is installed in the OSGeo4W shell?
Does anyone know how I can find out which version of Python ships with each version of QGIS? Specifically I'd like to know when the OSGeo4W shell changed from Python 3.7 to Python 3.9.
I think all of ...
- 1,816
-2
votes
0
answers
19
views
District selection would take place on all Opportunities that had tabs open under the Leaflet.js map that was implemented in the Salesforce VF page [closed]
The salesforce VF page used a leaflet.js map to select the customers' districts for their subscription. The selected districts in an opportunity are taken to other opportunities with open tabs when we ...
1
vote
0
answers
17
views
How to get gdalcalc output of non data input where one of two inputs is nodata
I am running gdalcalc 3.6.2 on two rasters with the same extent and CRS and would like to conditionally process two rasters based on their values.
I was previously doing a check like --calc="(A &...
- 111
1
vote
0
answers
26
views
QGIS: Manually control "showFeatureCount" display for layer labels in legends
Is there a way to manually control the feature count for vector layer legend entries in a print layout in QGIS?
Activate feature count for a vector layer in the layer tree context menu for the layer
...
- 93
0
votes
1
answer
18
views
PyQGIS - Set ellipsoid measurement as None/Planimetric [closed]
I would like to automatize some QGIS processes using the Python Console. I am trying to set two properties from the project properties, those are Ellipsoid Measurement as None/Planimetric and unit in ...
0
votes
0
answers
32
views
QGIS / PyQGIS automatically loading layers on startup (problem)
I made a small code to fetch some PostGIS layers into QGIS and apply them with qml style, like the following:
import os
from qgis.core import QgsVectorLayer, QgsDataSourceUri, QgsVectorLayer, ...
- 113
0
votes
0
answers
15
views
Cannot export RGB values to CSV
I can export NDVI values to CSV file. But I couldn't export RGB values(b2,,b3,b4) to csv file and RGB values must be in range 0-255.
var geometry =
/* color: #d63000 */
/* displayProperties: [...
0
votes
0
answers
28
views
Export georeferenced .tif in ArcGIS Pro with a transparent background
I am a graduate student relatively new to using ArcGIS. I have georeferenced a bunch of historical images and I want to export them as .tif files with the georeferencing information included. When I ...
- 1
0
votes
1
answer
17
views
Creating a 500m circle centred on a coordinate in OpenLayers
All I want to do is create a 500m circle around One Tree Hill in Auckland New Zealand, but nothing works for me. The codes I've tried seem to run, I've specified huge radii to check to see if the ...
0
votes
1
answer
28
views
Error in valid.viewpor: invalid 'yscale' in viewport
I have one month of data that I converted to STDFDF.
#set the spatial location of the regions
Data.loc <- data.frame(Stat = c("Firmo","Citta dei Ragazzi", "Rende",
...
0
votes
0
answers
11
views
GeoServer Data Migration to the new server and merge of few GeoServers into one [duplicate]
I have 3 GeoServers that I need to migrate and "merge" data from them into 1 new server.
What is the proper way to do that?
I've googled that it should be enough to migrate data_dir folder ...
0
votes
0
answers
28
views
How use multiprocessing with function arcpy.da.InsertCursor
I'm working with a table in the database that has more than 1 million records and a total load of this table takes about 8 hours because it has geographic data, the table is a featureclass. Basically, ...
- 1
-2
votes
0
answers
9
views
Calculating burned area with MCD64A1 Version 6 dataset using R [closed]
I'm looking for a sample R-code which calculates annual burned area for a specific country e.g. Spain based on MCD64A1 dataset.
- 1
0
votes
1
answer
12
views
Java lang error on a WFS request in x-www-form-urlencoded when using propertyName
Using GeoServer 2.21.2 and WFS, we are switching from doing a GET request to a POST because we're reaching the URL length limit and we're using x-www-form-urlencoded format, which works correctly ...
0
votes
0
answers
13
views
Cropping .TIFF images based on imported .kml file and tiling grid system of Sentinel 2 satellite imagery in Python
I have some .jp2 formated satellite images (ex. "T42UWF_20220714T063641_B04.jp2") which have a resolution of (10980x10980).
I import Sentinel-2 Level 1C tiling grid system .kml file and ...
2
votes
0
answers
31
views
How to ensure a newly created layer displays on the canvas
I am trying to perform some categorization from an existing vector layer such that after performing the calculations, a new vector layer is created with just the new fields created. After running my ...
- 63
1
vote
1
answer
16
views
Overpass turbo, Get center of area
I have this query for overpass turbo ,
[out:json][timeout:25];
area["ISO3166-1:alpha2"="AM"][admin_level~"2"]->.search;
(way(area.search)[place~"town|city"];
...
- 165
1
vote
0
answers
18
views
Training data with complex vertices
I am new to GEE. I built this script to conduct crop type mapping using RF. However, my training data contain too many vertices which I think is causing the problem of computation value and memory ...
- 81
0
votes
0
answers
21
views
Draw an area having only a point and distances to the 4 borders
Using Geotools with Swing GUI.
Is it possible to somehow create a shape having only one coordinate (Lat,Lon) and four distances in meters to the borders?
Lets say we have only the "C" point ...
- 1,908
2
votes
1
answer
31
views
Leaflet draw shapes and get the overlapped/included zipcodes
I am new to the GIS world but I have experience in programming. I am trying to build an app where users draw circles on a leaflet map and it returns the zipcodes "touched", but I think the ...
- 21
0
votes
0
answers
28
views
Organize the attributes in Attribute table without changing in layer data in QGIS using Python
from qgis.core import QgsProject, QgsVectorLayer
# Load the layer
layer_name = 'fibre'
layer = QgsProject.instance().mapLayersByName(layer_name)[0]
# Define the desired field order
field_order = [&...
- 1
1
vote
0
answers
25
views
How do I display coordinates of each polygon corner in the attributes table
Is there a way to display coordinates of each corner of a polygon in the attributes table?
My end goal is to create a map that shows point numbers and coordinates for each corner of a polygon.
- 11
1
vote
1
answer
22
views
Use child's last values for new child feature
I have a layer "trees" and a child layer "observations". When I create a new child, I do not want to fill in all the data (e.g. vitality) again. Each observation has a date - what ...
- 2,508
0
votes
0
answers
12
views
How to fill automatically points touching line layer in the attribute table? [duplicate]
I am trying to build a basic road transport network using QGIS, at this stage: one layer for nodes (nodes are dots connecting lines, one node connects two lines) and one for links (a link is a road, ...
- 1
1
vote
0
answers
14
views
Calculating slope-adjusted surface area from DSM
Is there a (simple) way to calculate the surface area from a regular DSM raster considering the slope/aspect? In my case I've got a DSM (0.5m resolution) with a building, I would like to calculate the ...
- 11