All Questions
156,469
questions
0
votes
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answers
6
views
Trying to determine the amount (area) that falls within each of the different buffer polygons
I am trying to determine how much hardscape area falls within each of the 250m buffers around my sites.
The goal is to determine "percent impervious" around my sites. I want the area of ...
0
votes
0
answers
3
views
Supervised classification using training samples from different months
I am performing supervised classifications of forest stands in the Delta region of Buenos Aires. For these classifications, I use a set of bands and indices derived from Sentinel-2 images for ...
- 13
1
vote
0
answers
4
views
GEE, filtering a scatter plot
I need to make a trend line in a scatter plot but there are some other values that doesnt matters to my assessment. I need just the values on a decreasing trend on the right side.
- 27
1
vote
0
answers
5
views
Adding Input properties for crop classification
I wanted to classify the image on the basis of image data and ground-measured parameters in the Google Earth Engine. I tried to add the feature properties as input properties along with the band but ...
- 69
1
vote
0
answers
10
views
1400 grids in a shapefile that I want grid labels to display in trimble
So I have a grid boundary shapefile where I want to upload into TerraSync so I can collect data and know which grid I am currently in. Is there a way to do that in ArcMap or in TerraSync?
I found this ...
- 21
0
votes
0
answers
11
views
Minimal list of non overlapping zip codes that cover all of the US [duplicate]
I would like to get a minimal list of non overlapping zip codes that cover all of the US (no territories) within a 25 mile radius. If it were to be visualized it would be a bunch of mostly non ...
1
vote
0
answers
10
views
Opening a WMTS file in ArcMap
I am trying to open the following file in ArcMap desktop: https://www.arcgis.com/home/item.html?id=7254c77048444a45a5d41cf43445572b
It downloads either as PITEMX file or as an ArcGIS Portal Item. I ...
- 21
0
votes
0
answers
12
views
How to create Individual polygons from Raster Pixels in ArcGIS Pro?
I need to convert a raster image into Polygons so I can remove some pixels that are not in homogeneous areas.
The problem I am having is that Raster to Polygon tool turns all pasters into a single ...
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votes
0
answers
13
views
Add buffer with no overlap using `sf`
Given a map, I am trying to add a buffer to the outer region; that is, the boundaries with no neighbors.
Unfortunately, the sf::st_buffer() method does not do the job.
Here is a reproducible example
...
- 1
0
votes
0
answers
11
views
Can't acces web admin using internal IP address and port
Version: Geoserver 2.22.2
I have geoserver running behind an haproxy.
Geoserver is configured with a "Proxy Base URL" in the "Global" Settings.
The web admin interface is ...
- 151
0
votes
2
answers
10
views
Loop rename rasters in brick or stack in R
I'm running a randomforest on a raster stack/brick in R. I know how to rename individual layers in the stack, but since my stacks have numerous Landsat scenes, I was hoping to loop through the stack. ...
- 345
0
votes
1
answer
6
views
Not able to add all Landsat8 data folders to Mosaic dataset in ArcGIS Pro
I have a set of folders from Landsat data, each folder is of a different year. When I add all these folders to add rasters to the mosaic dataset tool. The final output shows me data for only one year ...
0
votes
0
answers
8
views
Set a single color gradient with R's mapview
I'm trying to setup a mapview of some Census data and am struggling to color the areas (Census tracts in my case) using a single color gradient. Example would be coloring light blue for the lowest ...
- 101
0
votes
0
answers
13
views
SQL joins in QGIS's DB Manager take hours and crashes the program
This may be a few different issues, but I have a few files that I am trying to join in QGIS.
I have one LINESTRING file of street segment data. It's for a whole county, so there are about 32,000 ...
0
votes
0
answers
29
views
QGIS, Rule-Based Symbology Not Working, But Feature Filter Does
I'm trying to symbolize earthquake points by intensity, depth and date, I could create twelve separate layers but I thought using the rule based symbology would create a single nice and tidy layer, ...
- 39
1
vote
0
answers
12
views
Cloud pixel filters for Sentinel-2 images
I'm trying to perform a supervised land use classification for a region (Buenos Aires Delta) and a specific time period (between January and March 2017). I'm using Sentinel-2 images processed in GEE ...
- 13
0
votes
0
answers
6
views
Creating DEM/DTM from PlanetScope imagery
I am hoping to use Planet's SuperDove & earlier satellites to create a recent timeseries of glacial change.
While I've found a couple of papers that establish a methodology for creating DEMs from ...
- 1
2
votes
2
answers
39
views
Is there a way to access named PostgreSQL connections via PyQGIS in order to access and load spatial layers?
As seen here, it is possible to use PyQGIS to load layers from PostgreSQL using an instance of QgsDataSourceUri(). You then set the connection and load a layer.
Loading PostGIS layer from SQL query ...
- 31
0
votes
1
answer
9
views
GDAL predicator and Tile Offsets
I would like to "shift" the origin of a BigTIFF file. But is is not so easy. So instead, I try to use gdal_translate to create a new file. But when I compare the original file and the ...
0
votes
0
answers
25
views
Using "Buffer Without Overlaps" plugin (QGIS)
I am trying to use the "Buffer Without Overlaps" plugin with this shape file.
However, I am facing the following issue:
Error: Algorithm saga:polygonselfintersection not found
How do I ...
- 1
0
votes
0
answers
9
views
Can I use NASA FIRMS to detect the heat/smoke from airplanes taking off and landing? [closed]
My impression is no bc the satellite passes aren't frequent and sensors aren't sensitive enough but I'd like to see if this is at all possible.
0
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0
answers
15
views
Excluding some attributes from being labeled in ArcMap [closed]
I am using ArcGIS 10.8.1 and would like to exclude some attributes from being labeled by using the Label Expression. How would I get an expression to select ALL the attributes EXCEPT three?
- 13
0
votes
1
answer
10
views
Unable to transform edge error when clipping ImageCollection in Google Earth Engine
I am attempting to clip an ImageCollection in GEE, but I keep getting the error
"Unable to transform edge (43200.000000, 1.476288 to 43200.000000,
1.477361) from SR-ORG:6974 PLANAR [926....
- 3
0
votes
1
answer
17
views
Setting labels as background labels in QGIS?
Is it possible to set labels as background labels in QGIS ?
See this page to see what i mean.
- 43
0
votes
1
answer
19
views
Extract specific lat and long values in GeoTIFF file using Python
I have a GeoTIFF file and I have extracted the lat long values of each pixel in the file. However, I am looking to extract lat long of specific regions in the GeoTIFF rather than all of it. Here is ...
- 1
0
votes
1
answer
37
views
How do you interpret a DEM? [closed]
I have been asking myself a question for some time. How do GIS experts interpret a DEM (1) ?
In my opinion, there are two ways of interpreting the value of a DEM pixel :
Consider that the pixel value ...
- 1,329
0
votes
1
answer
19
views
QGIS - Countif function on columns
In this question I asked for a substitute of the 'Countif' function in Excel to be used to populate a field depending on how many values different from 0 were present in the several attributes for ...
- 480
0
votes
0
answers
11
views
3D Model from Low Resolution Height Map
Currently, I'm trying to develop a 3D Model of an Island using a Digital Elevation Model/Map/Raster. But, because the Elevation of the island isn't quite high, its resolution within the DEM.tif isn't ...
0
votes
1
answer
13
views
"Image.select: Pattern 'blue' did not match any bands" error during LULC change detection using Earth Engine
I've been working on LULC change detection using Earth Engine. When I run to export any of the TIFF file I'm getting the same error.
This is the error I get every time
Error: Collection.toList: Error ...
0
votes
0
answers
7
views
Watershed analysis for water samples results in multiple overlapping lines [closed]
Using StreamStats I exported polygon shapefiles of areas that drain into points I've sampled. I then converted those into lines. The problem is that multiple lines overlap (share boundaries) at ...
0
votes
0
answers
9
views
Google Earth API [closed]
I want to design a site that is written with HTML, CSC and JavaScript. I want to send a series of weather codes, for example, the code of a rainfall model along with the size and geographical area ...
1
vote
0
answers
16
views
Open zipped shapefiles in Java GDAL
I have a .zip shapefile containing all the formats (cpg, dbf, prj, shp, shx) and I wanted to access them using GDAL. I've tried:
ogr.RegisterAll();
Driver driver = ogr.GetDriverByName("ESRI ...
2
votes
1
answer
37
views
QGIS 3.22.16 Bialowieza. Selecting matching value in 2 fields
I am using QGIS 3.22.16, I try to select similar 'null' value in 2 different field. I tried the solutions suggested from one this exchange.
Selecting features with equal values in different fields in ...
- 163
0
votes
0
answers
12
views
Categorise vector arrows, with slope attributes [closed]
I have been struggling for a couple of weeks now trying to create vector arrows which I can categorise into slope values in percent. How can I do this?
2
votes
1
answer
28
views
Zonal Statistics not executing in arcpy
I'm trying to run code to automate getting zonal statistics from a folder with almost 50 shapefiles and 6 rasters from another folder. So, each shapefile needs to do the zonal statistics on each ...
- 107
1
vote
0
answers
18
views
ArcMap maps don't print at exactly 1:24000 scale
I'm printing out USGS topo maps, that when printed should be in at a 1:24,000 scale. However, when measuring the physically printed maps, the 1 mile scale bar does not match my physical 1:24,000 ruler ...
- 21
0
votes
0
answers
8
views
How to connect to Sepal to Google Earth Engine [closed]
I am new to Sepal and I am trying to connect my Google account to Sepal but I keep getting an error and can't connect. I have tried clearing my browser caches and restarted my computer but it is not ...
- 1
0
votes
2
answers
26
views
QGIS keeps closing when trying to reenable the Processing Plugin
Refers to:
QGIS version 3.22.2
Windows 10
I was doing first steps in the processing script environment and added testwise the code line
qgs = QgsApplication([], False)
to the processing script. After ...
- 177
0
votes
0
answers
24
views
How to create rectangle just like Leaflet in OpenLayers 3
In Leaflet, we create rectangle using below code
var pointList = [pointA, pointB];
// lines of longitude
lngPolyLayer = new L.rectangle(pointList, {
color: "#9fd1d4",
weight: 2,
...
- 111
1
vote
0
answers
18
views
Reproducible reprojection in `sf`
I have two machines that give different results for the same CRS transformation. Both are using renv with the same lockfile, and hence they have the same version of sf, namely 1.0-7, so it puzzles me ...
- 135
2
votes
1
answer
28
views
How to make a hyperlink for a point layer in QGIS so that you can go to Google Maps
How to make a hyperlink for a point layer in QGIS so that you can go to Google Maps.
I need to have a separate field when clicked it will show me that point on Google Maps.
- 69
1
vote
1
answer
12
views
How to use getBounds() in OpenLayers 3
I am working on a project to create map using OpenLayers 3. Previously I was working with Leaflet but now I am working with OpenLayers 3.
In Leaflet, I was fetching bounds using below code
var bounds =...
- 111
0
votes
0
answers
5
views
How to get iface object in stand-alone Python installation of PyQGIS [duplicate]
In developer cookbook https://docs.qgis.org/3.28/en/docs/pyqgis_developer_cookbook/composer.html#id1 there is a list of modules to be imported to use the code examples below.
When I include this and ...
0
votes
0
answers
22
views
Displaying 'print' output when working in Processing script
How can I configure the development environment when writing processing scripts with PyQGIS that I can actually see print output?
For example, the following script only opens the gui for running an ...
- 177
0
votes
0
answers
10
views
Why clip_roi function in lidR only work with SpatialPolygons and not SpatVector?
Most of the functions from lidR work using SpatVector and SpatRaster from terra package but I obtained this error using clip_roi function
Error in clip_roi(ctg, Extent1) : Geometry type SpatVector not ...
- 147
1
vote
0
answers
23
views
Changing coordinate system and extent of shapefile in ArcMap [closed]
I am using ArcGIS Desktop 10.8.2.
I tried to change the coordinate system in a shapefile from TM65 / Irish National Grid to the coordinate system of a raster file (wgs_1984) opened in the same session....
- 41
1
vote
0
answers
12
views
QGIS grass imports vector line data as points, not vector lines
I am very new to QGIS and Grass. I am trying to create a dxf file with height data using Grass 7 as per this youtube video. (1:35 mark)
My contour data and Qgis file is uploaded here. When I go to ...
- 11
1
vote
1
answer
23
views
Plot shapefile as squares
I am trying to plot a US shapefile as squares instead of showing the actual boundaries.
I can plot a shapefile like this...
import geopandas as gpd
import numpy as np
State_Shp = '.../...
- 21
1
vote
0
answers
17
views
Osmosis no space left on device
Issue with performing extracts on compressed file results in error
Caused by: java.io.IOException: No space left on device
Background:
I am working on extracting city data from a europe-latest.osm.pbf ...
- 43
1
vote
0
answers
11
views
Convert ERA5 data on zero degree level into meters above sea level
I am trying to calculate the zero-degree isotherm (altitude in which temperature is at 0 degrees) in meters above sea level. I used ERA5 data by ECMWF for this and I noticed that the values decrease ...
- 11