All Questions
150,397
questions
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answers
3
views
Merging polygons without creating new layer
I'm new to using QGIS and I ran into an issue - I would like to merge a few polygons that I created as separate. I found a way how to do it through "Dissolve" option, but this creates a new ...
0
votes
0
answers
5
views
Where can I find a heightmap of South Africa?
I've been looking for a heightmap of South Africa for a while but I can't seem to find the kind I need anywhere. It needs to be a DEM, Grayscale Raster with relatively high quality.
- 1
0
votes
0
answers
4
views
Picture naming with attributes of the corresponding layer
I am trying to add controls (layers without geometry) to control objects (point layers). For this, I take several images, too.
Now I try to name the images with attributes of the corresponding control ...
- 1
0
votes
0
answers
4
views
How current are near real time MODIS products maintained by GEE (MOD09GQ) ? What is the update frequency?
I'm trying to compute a near real time time series of MODIS daily NDVI from MOD09GQ for an area of interest.
I was using some download tools that got deprecated and are no longer supported (MODIStsp ...
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votes
0
answers
5
views
Sample S2 images, getting the closes pixel for nodata
I got something like this:
var cld = require('users/fitoprincipe/geetools:cloud_masks');
function quick_cld(img){
return cld.sclMask(['cloud_low', 'cloud_medium', 'cloud_high', 'shadow'])(img)
}
...
- 264
0
votes
0
answers
6
views
Search if point is inside bbox in MongoDB
I am having difficulty finding away to search if a user current geo location is inside a bbox array that is stored in MongoDB.
For example I want to see if the following 174.763336, -36.848461 is ...
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votes
0
answers
9
views
Service area/accessibility analysis from point and avoiding polygon layer
I have a point layer representing a sea bird colony (being a single point is an approximation but effect will be small). I also have a polygon layer of all land masses (from naturalearthdata.com). I ...
- 283
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votes
0
answers
15
views
K-means cluster, maximum size of cluster in QGIS
I have 591 locations and I want to create 50 clusters where minimum and maximum size of the clusters should be 8 to 12 points using k-means cluster. Is there any possible way to adjust the cluster ...
0
votes
0
answers
11
views
AutoCAD text to line
I need to convert AutoCAD text objects to line objects to preserve text direction and attributes. As a result I need line objects oriented like text in CAD file. Maybe there is a method?
0
votes
0
answers
12
views
Pandana not working with large dataset
I am trying to use "pandana" for network analysis instead of "networkx". With 400000 rows of my dataset works but with 500000 does not (numbers are not precise). I have my nodes ...
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votes
0
answers
10
views
Can't complete creating a polygon in ArcMap
I am using ArcMap 10.7.1.
The problem started suddenly, when creating a polygon. Instead of what ArcMap usually does, which is autocompleting to the first vertex completed, it moves the suggested &...
1
vote
0
answers
8
views
Ogr2ogr from Oracle to PostgreSQL transforms umlauts to non-umlauts
We use ogr2ogr to dump data from an old production Oracle server to a development PostgreSQL server. From developer Windows laptop everything works as intended, but from a Windows server the umlauts (...
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votes
0
answers
8
views
Import format template .ai to a .qpt template
I work for a company that uses adobe illustrator(AI) for layout-issues.
When I make maps, the workflow is first do my work in QGIS, then pre-layout in QGIS-Layout, export to .svg and then finalize the ...
- 1
0
votes
0
answers
12
views
Zoom to and highlight search result in OpenLayers
I have a function to search from layer. I got the desired results, so I want to zoom-in and highlight the results I found. How can I do that?
This is my code:
var sothuaMap = document.getElementById('...
- 15
0
votes
0
answers
12
views
Extracting part of raster with smaller raster using GDAL
I have a raster file with the extent of
[-169.04000663757324, 42.95999826798774, -54.3399982452392, 9.76000022888184]
I want to extract part of this raster by bounding box of
(-148.966066831209, 64....
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votes
0
answers
5
views
What does the height and width properties of an AGOL WebMap object actually do?
The WebMap object has a height and a width property but what do they control? What is their purpose?
See the height property in the API Document
See the width property in the API Document.
from arcgis ...
- 1,093
-1
votes
0
answers
9
views
How to determine or count the number (Frequency) of extreme precipitation events based on monthly and annual rainfall data?
I have IMD Gridded Rainfall (0.25 x 0.25) NetCDF File. Also, PERSIANN-CCS-CDR (Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks-Cloud Classification System-...
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votes
0
answers
14
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Estimating soil moisture from SAR data using CNN
Some detailed explanation regarding data collection, pre-processing and model training for estimating soil moisture from sentinel-1 SAR Image will be of great help for our project.
I went through some ...
0
votes
1
answer
14
views
Qgis 3.24 Tisler plugin installation failing with timeout
When I try to install plugin I get this error (same error for multiple plugins) :
Installation failed: Error transferring https://plugins.qgis.org/plugins/qgis-maptiler-plugin/version/3.1.1/download/ ...
- 1
0
votes
0
answers
4
views
Grass 8.3 Not downloading Sample data or Addons/Extensions on Window's 11
I m trying to install addons in Grass 8.3 and download the sample datasets, but the error message says I m not connected to the internet. I am. The only sample dataset that was downloaded was the ...
- 39
0
votes
0
answers
15
views
Ballpark-only transform in QGIS
Can someone help me to address the below error when I was trying to create elevation maps from a Raster DEM file?
An alternative, ballpark-only transform was used when transforming
coordinates ...
-2
votes
0
answers
14
views
Tachometer instrument in Ships [closed]
Tachometer
Is Tachometer instrument used in Ships for measuring Speed?
If Not, Why?
What are the instruments used in Ships for measuring the Speed at which the Ship is travelling ?
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0
answers
18
views
Cannot read SHP polygon using Geopandas
I am trying to read ESRI SHP Polygon using geopandas:
polygon=gpd.read_file(r'Path.shp', encoding='utf-8', driver='ESRI Shapefile')
But I am getting this error:
NotImplementedError: A polygon does ...
- 91
2
votes
0
answers
20
views
Postgis storage format in QGIS
I have a postgis table with two geometries, a point for a lightning strike and an uncertainty ellipse as a polygon for the lightning strike. I can easily pull each of those geometries into QGIS to ...
- 3,152
0
votes
0
answers
6
views
Error downloading project file to local device from QfieldCloud
I am getting an error downloading project files to local Android device from QfieldCloud.
I am able to successfully package and upload a QGIS project to the cloud on Qfield 2.23 using QGIS 3.24.
I see ...
- 1
2
votes
1
answer
20
views
How to find all gas stations along the route with Google maps?
I would like to see all gas stations for my long trip, exclusively only those, which are along the picked route.
I searched for my destination city, tap/click directions, and now I see the route. Then ...
- 121
0
votes
0
answers
12
views
How to get all unique raster values of intersecting vector in Python?
I have a tif-file containing categorical numerical land cover values and a gdf-file containing roads as linestrings. I'd like to create a new column to the road gdf that contains all unique ...
- 21
0
votes
1
answer
17
views
Creating time-series chart out of list in Google Earth Engine
I have reduced a band/variable of daily image collection to monthly collection. The function returns a list containing objects with 2 properties. Like this
I want to plot a time-series chart of all ...
- 49
0
votes
0
answers
28
views
Buffer tool not working in ArcMap
enter link description here> Blockquote
The two hyperlinks above are the explanations of the assignments 1 and 2 from a GIS course provided by Coursera which I am currently taking.
See the page ...
- 1
0
votes
0
answers
6
views
Differences with multiple time zone names sharing same offset and rules? [closed]
My project has me storing time series data based on location, and as I sometimes need to de-localize the time, I use timezonefinder. One thing I've recently become aware of is that some US time zones ...
- 101
0
votes
0
answers
6
views
Digitizing a rotated graphic
I often use Illustrator to render maps and landscape designs. As geometry may evolve in Illustrator, I want to digitize the results in QGIS. Illustrator can export to dxf or dwg, but the map is ...
0
votes
0
answers
27
views
Error: Projection: The CRS of a map projection could not be parsed. (Error code: 3)
I transferred the image I exported from Google Earth Engine to QGIS. I am getting projection error in my work. Anyone have an idea about this?
When I want to export in WGS 84 EPSG:7030 I get the error ...
0
votes
0
answers
6
views
Using PyQGIS to generate a triangulated VTK/STL mesh from OpenStreetMaps data
I am interested in using OpenStreetMaps building data in PyQGIS to generate triangulated VTK or STL files. I am able to get the features I want as QgsGeometry objects. The problem is that these ...
- 1
1
vote
0
answers
19
views
Unable to import raster into geopackage in QGIS
Whenever I try to import a raster layer in the form of a geotiff into a geopackage in QGIS I just end up getting a black area with no values. Am I not importing the raster properly or do geopackages ...
- 57
-1
votes
1
answer
15
views
Time difference between two string fields with microsecond (or seconds) resolution using, Arcpy, datatime and UpdateCursor
I am trying to calculate (using Arcpy) the time difference between two fields that are in string data type and they have the following time format "YYY-MM-DD HH:mm:SS.sss"
I have achieved ...
- 39
-1
votes
1
answer
18
views
Where-clause based on attribute value in ArcPy
I am trying to create a Python toolbox which will iterate through selected features and create a statistics table for each selected feature.
It works as follow:
Define parameters, including the input ...
- 639
1
vote
1
answer
20
views
Create polygon from a line
I have searched high and low and cannot figure out how to do this... I need to create a polygon based off a flight path, defined by radius to either side of the path. For example, if an airplane ...
- 11
0
votes
0
answers
12
views
Problem while decompressing the bz2 file
I am extracting the 38 .bz2 files containing MODIS data.
My code is:
inpath = '/Users/gulfcarbon2/Downloads/Modis/2002folder/2002_L1A_LAC'
outpath = '/Users/gulfcarbon2/Downloads/Modis/2002folder/...
- 11
1
vote
0
answers
21
views
QGIS Azimuth and Distance Plugin Right/Left Curve Input
I'm having a problem with left/right curve of radius rr and distance dd entry for the Azimuth & Distance Plugin. I've only used the plug in for straight lines and it has performed fine. I now have ...
- 11
0
votes
1
answer
15
views
Object error thrown at arcpy.DeleteField_management line?
My script keeps giving me an error, "RuntimeError: Object: Error in executing tool", from the line arcpy.DeleteField_management("blocks", field). I'm relatively new to ArcPy and ...
- 311
0
votes
0
answers
17
views
AttributeError: DescribeData: Method shapeType does not exist
Can anyone help me resolve this error?
I am running the script below in an ArcToolbox.
aprx = arcpy.mp.ArcGISProject("CURRENT")
Map1 = aprx.listMaps("Map")[0]
#Map2 = aprx.listMaps(...
- 25
0
votes
0
answers
8
views
Dynamically link Excel table to ArcGIS Online map
The newest question about this is from 6 years ago so things might have changed in the meantime.
I have an interactive web map based on a sharepoint Excel table with a list of georeferenced points ...
- 1
0
votes
1
answer
18
views
How to use Buffer on a Feature Collection?
I'm working in GEE and trying to create a buffer around the coastal_saltmarsh Feature Collection imports(imported as table). However, GEE allows the use of buffer only on a Feature or Geometry(ee....
0
votes
1
answer
17
views
Error reducing daily image collection to monthly and making a time-series chart in Google Earth Engine
I am new to GEE and don't know lots of concepts. I am trying to make a time-series chart of an image collection that I have reduced "Daily NASA Earth Exchange Global Climate Projections" ...
0
votes
0
answers
35
views
layer.featureCount returns 0 even though features are present
I create a new shapefile with a plugin, no problems. But when I use the layer.featureCount() function in QGIS in the Python Console, it returns 0 even though there are features.
So far I have found ...
- 1
0
votes
0
answers
8
views
Clipping .gdb then exporting as .kml issue
I am new to QGIS.
Not all contour lines are appearing after a convert a clipped .gdb to .kml and open in Google Earth. Most appear, but some do not, including the ones that are critical to my project.
...
- 1
0
votes
0
answers
3
views
How to set number of columns with stack or brick or spatraster in rasterVis::levelplot?
If I have a spatraster with 6 layers, rasterVis::levelplot will give a 2 rows and 3 columns plot.
How can I change it to 3 rows and 2columns?
library(rasterVis)
library(terra)
f <- system.file(&...
- 89
-1
votes
0
answers
15
views
Calculate area of suitable, moderately suitable, highly suitable and non suitable from maxent species modelling [closed]
I've a species distribution modelling map derived from maxent and I want to calculate area of suitable, non suitable, moderately suitable and highly suitable in QGIS. How can I do this?
1
vote
0
answers
13
views
Save scipy interpolations as a raster (GeoTIFF) format using Python
I am using scipy.interpolate (Python 3.9) to interpolate some data. However, after using a nearest neighbor interpolator, I need to save it as a raster (GeoTIFF) image, preserving the resolution of 0....
- 115
0
votes
1
answer
26
views
Computed values outside of expected range (Earth Engine)
I'm working with an NDVI (normalized difference vegetation index) time series. NDVI is expected to have a range [-1, 1]. My analysis, which applies a Whittaker Smoothing algorithm, is producing values ...
- 11