All Questions
150,240
questions
1
vote
1
answer
8
views
How can I convert a continuous raster into a discrete (categorical) raster using QGIS?
I am using QGIS 3.22.7, and I wish to classify a continuous raster with one band into 5 discrete categories based on raster values. The raster I am working with can be found here (file size: 874 KB). (...
0
votes
0
answers
5
views
Animating data with Temporal Controller
I have been trying to make an animation with the Temporal Controller in QGIS using a custom .csv file, created by merging lat, lon, arrival_time, departure_time, stop_name and stop_id.
It currently ...
- 55
0
votes
0
answers
8
views
R - Finding closest point to each point and filtering which points to consider
I'm a first time poster and beginner in R, so bear with me. I am working in R with a dataset of bird nest locations and am interested in the distribution of said nests. Specifically, I'd like to find ...
- 1
0
votes
0
answers
4
views
Auto zoom in to the selected object in geoserver/geonode
I am pretty new to the Geonode. I have successfully published layers and created an interactive map. I have 14 layers, which loads entirely for my country. But now I do not want to load layers ...
- 131
0
votes
0
answers
5
views
QGIS - Does the Coordinate reference systems of 2 vectors/shape files matter if they are the same or not?
I have two polygon shape files. It says in the information properties that the CRS IS EPSG 4326 and the other one says the CRS is a custom one(I put this custom one). Since these are shape files, ...
- 61
0
votes
0
answers
6
views
List layer by data type in python window, eg: Layer == Polyline or Layer == Point
I am trying to locate features along routes for polyline and point features in a map. SThe locate features along routes tool requires two separate parameters; one for polyline and one for point ...
- 15
0
votes
0
answers
8
views
Error when trying synchronize from Qfield
I am get error when trying synchronyze information from QField to Postgis table:
The error in the QGIS console is following:
Please help me because the fields are well defined in the database and I ...
0
votes
1
answer
9
views
Using select by attributes across mutliple layers in ArcMap
I am using ArcMap 10.8.2.
I'm working on a GIS update for a local municipality. They've asked that I only send them back data that I've added or changed.
It seems the easiest way for me to do this ...
- 1
0
votes
0
answers
8
views
How to change Zoom button in PopupFeature with Openlayers?
I'm using the code https://viglino.github.io/ol-ext/examples/popup/map.popup.feature.html to create the Popup, to show the features information.
As can be seen in Figure 1, we have a magnifying glass ...
0
votes
0
answers
13
views
Google Earth Engine: Setting masked values to null [closed]
I'm using the JavaScript API to investigate a cloud masking function from this question, specifically the code here. I want to remove all pixels that have been identified to have a cloud or cloud ...
- 149
2
votes
1
answer
14
views
Best way to check if a point is in a region?
I'm working with Chicago PD crash data that includes Lat/Long. I've read the crashes data into the crashes DF.
It doesn't include the city ward number, so I'd like to add it. I figured out how to do ...
- 21
0
votes
1
answer
17
views
Gdal Python documentation
Where Can I find the python documentation for gdal, I am getting file not found error opening the gdal documentations all the time I have tried the following links
https://gdal.org/python/osgeo.gdal-...
0
votes
0
answers
7
views
Upon ArcMap data layer Reprojection, data is not lining up [duplicate]
My data will not line up after reprojecting into the coordinate system I am trying to match with another.
I have an existing layer called AA_Cities and a newly downloaded shapefile called ...
- 51
0
votes
0
answers
15
views
Viewing tiles created from GeoJSON in Leaflet/Mapbox
I have some zxy tiles built with tippecanoe that I can load into QGIS by setting a remote connection in the Vector Tiles tab to the url where the files are kept. However, I can not load them into my ...
- 39
0
votes
0
answers
11
views
Using GSI waterline data for mapping Japanese rivers
I am using the GSI waterlines layer as a basis for mapping rivers in Japan (from here: https://fgd.gsi.go.jp/download/, click box labeled basic items). Does anyone know how to delineate just the ...
- 1
1
vote
1
answer
14
views
Set user input as path for saving Python toolbox results
I created a Python toolbox to run in ArcGIS Pro 3.0.
I wish to save toolbox results in another geodatabase than the one by default, which contains input data.
This toolbox will be run by several users ...
- 621
0
votes
0
answers
12
views
Can't put the city name in a better position in tmap
I would like to create a map with the cities in Spain. I gave that code which I got from a programming book.
tm_shape(es) +
tm_borders("white", lwd = 1) +
tm_fill("migrationratio&...
0
votes
0
answers
7
views
R terra: [crop] SpatRaster has no values
I am attempting to use terra::crop() to crop 30 meter NLCD raster data to a bounding box. The final error that R returns is:
Error: [crop] SpatRaster has no values
despite the raster data containing ...
- 320
0
votes
1
answer
15
views
Creating optimal path between two spaces with point features in ArcGIS Pro
For my masters thesis I have mapped out all the green roofs in a city and I am trying to see if they can be used to connect two habitats. The two habitats are on opposite sides of the city and the ...
- 1
0
votes
1
answer
19
views
Draw a line between pairs of points with calculating the distance using Folium
I'm trying to achieve the exact transformation explained in this post.
Basically, I have a pair of XY coordinates (in EPSG 2154) and by using Folium, I need to :
display those points in a map
draw a ...
- 15
0
votes
0
answers
8
views
Using different Raster field when is not "Field" parameter for "input value raster" with arcpy.sa.ZonalHistogram
I want to get the Histogram of a Raster using the "Value" field in the raster attribute table.
The "feature zone data" is a shapefile and the "Input Value Raster" a 32Bit ...
0
votes
0
answers
8
views
Yearly Temperature using WorldClim in R
I have around 150 types of seeds that I am analyzing climate data for. Each seed has GPS coordinates of where it was collected and the year collected. I am trying to use WorldClim in R to figure out ...
- 1
1
vote
0
answers
13
views
QField doesnt recognize project data
I'm using QGIS 3.22.8 LTR, and exporting data via "cable export", creating a QField project (qgz) then sending it to a zip folder, transferring to the mobile device and unpacking it directly ...
- 11
2
votes
0
answers
28
views
ST_TRANSFORM NAD27 to WGS84
I've encountered an issue when transforming NAD27 coordinates to WGS84. The resulting WGS84 coordinates are off by quite a bit (10-12 feet in most cases) and it lead me to digging into why that is so. ...
2
votes
1
answer
22
views
Docking QGIS Plugin
How to dock QGIS plugin window? I am trying
self.iface.addDockWidget(Qt.RightDockWidgetArea, dlg)
in run method of QGIS Plugin Implementation class, but the dialog keeps appearing as a floating ...
- 504
0
votes
0
answers
7
views
Map Disappearing on HTML page when Sizing is changed from pixels (px) to percentages (%)
I am trying to allow this map to be resized via screen size (Mobile, Tablet, Chrome (Half Screen, Full Screen, etc.) so I know I can't set a specific pixel amount. However, when I do set a percentage ...
0
votes
0
answers
17
views
QuickOSM error when installing
I tried installing the QuickOSM plugin but when the installations finishes, i get the following error:
Couldn't load plugin 'QuickOSM' due to an error when calling its classFactory() method
...
- 13
0
votes
0
answers
10
views
Extract points with forecasts from dataset 'NOAA/GFS0P25' to save in a dataframe and plot in python GEE API
I am trying to get temperature forecast data from the GFS collection to a dataframe for graphing and export.
I have only been able to do it with a single point but I would like to do it with a series ...
-1
votes
2
answers
18
views
Pandas how to convert two columns to many columns and rows based on mutual row to row relationship [closed]
Let's say we have a df with row to row relation of some IDs, for example like this:
df = pd.DataFrame({"ID_nm": [1, 2, 4, 2, 3, 4, 5, 1, 6],
"ID_lt": ["a&...
- 171
0
votes
1
answer
22
views
AttributeError: 'NoneType' object has no attribute 'selectByExpression'
I get the error: AttributeError: 'NoneType' object has no attribute 'selectByExpression'
The first run through the loop is fine but at the second run the error occurs.
How do I fix this?
import ...
0
votes
1
answer
31
views
QGIS calculate area automatically
Is there a way to calculate area automatically when I edit a polygon? I mean, is there any function there I can use on area field and update itself when I finish editing?
- 641
1
vote
1
answer
22
views
QuickOSM does not return results
I'm trying to use the QuickOSM plugin so I can automate the search of addresses and creation of layers. Right now I'm just trying with one address using the key -> addr:street "Bäckerstr."...
- 13
0
votes
0
answers
18
views
Dividing study area between nodes [closed]
I have an area divided into zones and there are nodes which represent the road intersections in the area (A number of nodes might be present in a zone). I have to allocate the population from the ...
0
votes
0
answers
9
views
How to mask a raster image with classified image class mask?
I have classified an image having a class by the name lights. It has value equal to zero. I select the mask by using
var lights_mask = classified_image.eq(0).selfMask(); //binary mask
Now I want to ...
- 23
0
votes
0
answers
16
views
Obtain NDVI values by dates [closed]
For my master thesis I am trying to obtain NDVI values for some 1400 points, but according to the specific date of each point (between 2000-2021). For example for a point with date 2001-03-18 I only ...
- 1
0
votes
0
answers
8
views
Apply a function with a loop for in imagecollection
I am trying to apply a mask to a imagecollection, I want to a apply this mask image a image, because if I apply the mask to the whole collection, I cant extract values by points.
I am using a mask of ...
0
votes
0
answers
24
views
QGIS adds layer to GEOPACKAGE layer but displays "could not find layer"
I have noticed something strange when merging layers (not matching attribute tables) together.
When I try this QGIS responses 'Export in vector data failed. Could not find layer.'
So far so bad. When ...
- 73
3
votes
1
answer
73
views
Identify the algorithm (not code) for QGIS native tools
The question
For someone with no knowledge in C++ (programming language used to write QGIS code), is there a way to identify based on which algorithms the different QGIS native tools are written?
...
- 42k
1
vote
1
answer
16
views
Seeking tool for splitting lines with lines using ArcGIS Pro
I am using ArcGIS Pro 2.8 and would like to split some lines into segments using as a reference another lines layer (lines are not overlapping). I have this option on QGIS 3.10.3 but the tool still ...
- 51
0
votes
0
answers
17
views
OSM import into PostgreSQL database and export out to OSM
What is the best way to import OSM data into local PostgreSQL database
and to export it back out as OSM.pbf later?
Osmosis seems to work fine, however it is not actively maintained.
Background
Once ...
- 511
-2
votes
0
answers
16
views
Example code or source for drawing with ArcMap version [closed]
I need to make versioned drawing with ArcMap, but I have never worked before, I did some research with this library, but I have no idea which library to work with. Can you suggest me an example code ...
- 1
1
vote
0
answers
23
views
How to visualize the labels from a Point Cloud in QGIS?
I have a point Cloud (Las file) and I wolud like to see/visualize the labels (Z values).
There´s a way to do it in QGIS? (I´m using QGIS version = 3.24)
- 910
0
votes
0
answers
19
views
Classification of raster using raster calculator in ArcGIS Pro
I have multiple images of LST which I need to classify into various classes based on class ranges, given below. T is LST raster
Very cold temperature/Very Low T ≤ Tmean − 1.5std
Cold temperature/...
- 11
0
votes
0
answers
34
views
Searching feature in layer and zooming to result using OpenLayers [closed]
I'm new to OpenLayers and JavaScript. I want to create a search bar to search feature in my layer.
This is my search bar im HTML:
<!-- search -->
<div class="row">
<div ...
- 3
-1
votes
1
answer
13
views
Output raster of rasterio.mask doesn't match CRS of input
I'm trying to mask a raster with population data with my area of interest. I reprojected the original population raster according to the AOI's crs, but after masking and writing the new file, the crs ...
- 9
0
votes
0
answers
25
views
When using QGIS.Processing what is the temp memory argument? QgsProcessing.TEMPORARY_OUTPUT doesn't work
I am moving a QGIS model to PyQGIS to be able to run it as part of a bat file in OSGEO Shell.
It's working fine in QGIS and if the data in each stage is written to a on disk file but I can't write to ...
- 7,616
0
votes
1
answer
15
views
QGIS/GDAL Python- Export WMTS to geopackage raster, only for set extent and resolution
The problem: I need to export imagery from a WMTS or XYZ webtile source for a variety of geographically dispersed areas. It will be used in Qfield, so needs to exported as a geopackage raster.
In ...
- 166
0
votes
0
answers
9
views
Extent of a proj4 string [closed]
I have a custom proj4 string in which my data is represented in Cartesian local coordinates.
I don’t know the extent of the CRS and I would like to calculate in my end from the proj4 string. Is this ...
- 160
0
votes
0
answers
12
views
OSM - Geometry Requirements for Lines/Roads
Are there a set of rules for how OSM handles line geometry? Specifically I am looking for the resolution/spacing of points that make up a polyline/linestring road - is this something that OSM controls?...
- 11
0
votes
0
answers
14
views
ArcGIS Server Py3 - <type 'exceptions.ImportError'>, ImportError('No module named arcgis',), <traceback object at 0x00000000025870C8>
I have cloned the default python env that installs with ArcGIS Server using conda create in the python command window using:
conda create --clone arcgispro-py3 -p"C:\Program Files\ArcGIS\Server\...
- 1,465