Questions tagged [features]
Use this tag when asking questions about a representation of a real-world objects on a map.
906
questions
4
votes
2
answers
131
views
Duplicating rows according to field values in QGIS
I have a table in a GeoPackage like this
field1 field2
a;b 1
a;b 2
c;d 3
a;d;e 4
a 5
...
What I need is to create a new table in which the records are ...
2
votes
0
answers
89
views
QGIS error code, trying to split a layer [closed]
I keep getting the error code below when trying to split a polygon. There appear to be no duplicates and I have been able to spilt other layers within the same shapefile. Can anyone give me any work ...
0
votes
0
answers
16
views
FME 2021 Overwrite one feature in a geopackage [duplicate]
I am using FME 2021 and would like to delete or overwrite one feature in a Geopackage. Is there any tool in FME that will be able to delete or overwrite a feature. For information, When I created the ...
6
votes
3
answers
251
views
Finding nearest line feature from linear layer in QGIS
I have two linear layers like you see below:
I would like to select just the nearest black lines to the red ones, which represent the other layer.
I found similar solutions, but they refer to the ...
3
votes
1
answer
103
views
Activating two layers at the same time with PyQGIS
I want to copy-paste values from one feature in a layer to another feature in another layer, for this, I like to have both layers activated to be able to select features from both layers.
Just as an ...
3
votes
1
answer
201
views
How to recover parent value while creating parent and child layers in a embedded forms setup?
I read the documentation, examples and made many attempts, but I still can't make this work.
What I want is to get a value from a parent layer while editing a child layer, when both features are being ...
0
votes
1
answer
170
views
Why do I get array of features after click on one feature in OpenLayers?
There is a geojson:
{
"features": [
{
"id": "f6105acf-065e-499b-b23d-85298dd84108",
"geometry": {
"coordinates": [
...
1
vote
1
answer
388
views
Using the "Selected Features Only" checkbox with QgsProcessingParameterFeatureSource in PyQGIS script
I'm working on a custom QGIS Processing algorithm, and I'd like to include an option for the user to process only the selected features in the input layer by using the checkbox "Selected Features ...
0
votes
0
answers
84
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 ...
3
votes
0
answers
104
views
Why is it slow when deleting features in gpkg using PyQGIS?
Deleting features in a somewhat big GeoPackage takes a really long time and I am not sure if I do something wrong or if it is normal that it takes such a long time.
Data: line GeoPackage layer ...
1
vote
1
answer
102
views
Create layer from an array of geometries in OpenLayers?
After a fetch from a PostgreSQL view, I get a response and extract the geometries in an array of object result.
.then(rep => rep.json())
.then(tableauObjOpe => {
for (const ope of ...
0
votes
1
answer
51
views
WFS: Count available feature Types
Some WFS offer a large number of feature types, e.g. a collection of all public datasets from a municipality.
What is the right way to count the number of feature types of a WFS?
My idea was to search ...
0
votes
2
answers
793
views
How to split a feature collection in several equal parts in GEE
I have a feature collection (fc) consisting of 44 polygons. I need to create a time-series chart of NDVI values for each of them. I would like to analyse these polygons in groups of 4 - 5. Grouping ...
0
votes
1
answer
220
views
How to chart only a subset of features in a feature collection in GEE
I have a feature collection consisting of 44 polygons. I need to chart a time-series of NDVI changes in each of them. I want to chart the polygons in groups of 4 and select them myself, meaning there ...
3
votes
0
answers
66
views
Using get_feature() function on layer while editing in QGIS
In QGIS, I am trying to update a feature based on entries made on a nested form (relation).
Considering:
Layer1 has Field1 that should capture the value of Field 2, and field in Layer2
Layer2 is ...
1
vote
2
answers
108
views
Define ".setSeriesNames" as a specific column from my Feature Collection when charting in GEE
I have an asset imported from a shapefile in GEE. It is a feature collection with which I wish to chart a time series. The lines from each feature are labelled as system:index. See labelling of ...
3
votes
2
answers
207
views
Show length of selection
Today I was calculating length of features to know how long a certain route will be.
I was wondering if there is a quicker way to find out the length of a selection of features?
I am looking for a ...
1
vote
0
answers
76
views
Appending two online features and keeping the attachments in ArcGIS Pro
I need append two online features and keep the attachments. The process consists of putting 12000 images in 4000 points, but if two features have different attachments and I need to keep both.
I tried ...
0
votes
1
answer
225
views
Select multiple features from multiple layers in QGIS
I am analysing land use across multiple region.
Each region has its own vector dataset. Each dataset contains the same columns and land use classifications (e.g. 'AC66' or 'TC01'), describing units of ...
1
vote
0
answers
21
views
Clip all polygons inside the boundary of provinces to separate and calculate every inside polygons area
I need to calculate area of polygons inside every province but some of polygons are not exactly inside of one province and part of it is in one province and the other part is in another province. How ...
1
vote
1
answer
61
views
Highlighting features within radi from multiple points on map on QGIS
I'm new to QGIS so I'm not sure if I am missing a plug-in or something.
I have a layer showing demographic data and a layer with series of points.
How do I highlight features to get demographic data ...
1
vote
1
answer
78
views
Thiessen polygon delineation within a feature (polygon) not extent
I am trying to create Thiessen (Voronoi) polygons, based on points with a defined shapefile (separated polygons).
The output should be inclusive to the feature. The output I receive now is the ...
3
votes
1
answer
159
views
Skip (invalid) features with invalid geometries in project with pyqgis
I have configured a QGIS project with option processing to skip invalid features.
When I run my script in python console in QGIS the code runs without problems even with invalid geometries.
When I ...
3
votes
1
answer
113
views
Counting features in child table that are related to the report feature in QGIS
I am building out a report template in QGIS. I have a Field Group Section that generates a report page for every feature in Layer A. Layer B is related to Layer A in a many-to-one relationship like so....
0
votes
0
answers
32
views
Set display or non-display condition to display feature in a GeoJSON file in OpenLayers
I used the following code and put the displayed layers into a variable and selected the desired layer and I want features that have an area of less than 500m not to be displayed when the map zoom is ...
2
votes
0
answers
118
views
Changing the font size and placement of selected feature in QGIS
I have downloaded map data as an FGDB folder. There are names of places where some of them need to be highlighted and also moved a little. Names of places.
I select a placename (feature) and try "...
1
vote
1
answer
148
views
Moving polygon to edge of boundary using QGIS
I have a set of polygons that have been drawn using a set of plotted addresses.
All of these polygons fall within a geographical boundary of the local area.
As the boundary is drawn using local ...
0
votes
2
answers
451
views
ArcGIS Pro: Definition Query > Create new definition query in SQL
I have one point type feature class and another feature class with a polygon.
Using ArcGIS Pro, in the feature class type point > Definition Query > create new definition query in SQL.
I want as ...
3
votes
0
answers
91
views
"Select Features Using an Expression" tool is selecting wrong features [closed]
I'm very new to QGIS and GIS in general.
I have a shapefile of Multilines. The corresponding attribute table has a field called "Name". I want to filter the features in the table based on a ...
0
votes
0
answers
272
views
GeoServer MVT vector tile attributes
I am serving MVT vector tiles from GeoServer through its TMS api and I can't find a way to add feature attributes.
When I try to add these attributes in the edit layer/data tab, I get an error "...
1
vote
0
answers
116
views
Updating only selected features with the QGIS Gaphical Modeller
I want to update selected features (features within a specific buffer or selected with their attributes) with the graphical modeller of QGIS but It doesn't work because I don't find the algorithm in ...
3
votes
1
answer
91
views
Automatically copy across data from one layer to another where the field name is the same in QGIS
Layer A contains data in "Field A", Layer B also contains a field named "Field A", can I automatically transfer the data in "Field A" from Layer A to Layer B?
I used to ...
3
votes
1
answer
406
views
Selecting features with values whose difference is greater than 20 in QGIS
I have a LineString layer and it's attribute table has two different fields. I want to select all features with a difference of more than 20 between both fields.
6
votes
5
answers
2k
views
Getting the number of features in shapefile without opening it using Python
I have some big shapefiles that takes dozens of minutes if not hours to load. I was wondering if there would be a way to get the size of the files (number of rows) without loading them entirely. I ...
0
votes
0
answers
254
views
Load GeoServer WFS feature layer by block in OpenLayers
I have a WFS layer on GeoServer with more than 260,000 features, which contains data from an entire municipality. Thus, it takes a long time to load the entire layer on the map.
To test, I used a ...
0
votes
1
answer
194
views
Search feature by attribute and show centered on map in OpenLayers?
I have a layer in OpenLayers and I would like that, when clicked to become visible, it shows a text box or something similar, so that the user can enter a code.
Then, when the layer is shown on the ...
1
vote
0
answers
205
views
Singleclick on OpenLayers for multiple layers
I want to get information on click only for selected layer, but it seems like I get it for random one every time I click on.
Here is my code:
map.on("singleclick", function (evt) {
var ...
0
votes
1
answer
109
views
Batch change attributes in template properties in ArcGIS Pro
I am using a number of feature templates for mapping and would like to change a specific attribute in all templates with the same value without going through the list and change every single feature ...
0
votes
1
answer
284
views
Error when exporting FeatureCollection in Google Earth Engine
I got an Error: "Invalid argument: 'collection' must be a FeatureCollection. (Error code: 3)", when I was trying to export FeatureCollection. Geometry was a rectangle I draw to clip the ...
4
votes
1
answer
388
views
Extracting coordinates of line feature in QGIS
I need to get the x and y or lat and lon for a line feature in order to create a unique "ID" for a project I am working on.
I know a line feature has more than one lat and lon but I just ...
2
votes
2
answers
76
views
Finding observations by minimum distance in QGIS
I am trying to look at the distance between property sales and crimes committed within city. I want to be able to find all the crime that occurs within 1 mile of each property sold. I am sure that is ...
3
votes
1
answer
89
views
Searching for values in different layers without nested for loops using PyQGIS
I have a working process that uses a nested for loop to look through each feature of a point layer and search for a matching lat/lon of multiple line layers. It works fine but can take longer than I ...
3
votes
3
answers
785
views
QGIS: fill a simple line polygon with color when selected
I have a polygon vector layer with Simple line symbology.
When I select one from Attribute table, QGIS change the boundary color in yellow, but I have difficulties to find it easily between many ...
3
votes
1
answer
72
views
QField - how to show features list in alphabetical order?
I created a project in QGIS and synced it to QField. When I ask qfield to show a features list of a point layer from the project the names are not in alphabetical order. Is there a way to ...
6
votes
1
answer
264
views
Finding the shortest distance between two selected polygons using PyQGIS
I'm researching the shortest distance between two selected polygons among the number of polygons in a shapefile using PyQGIS. Coding as follows>
layer = iface.activeLayer()
sFeat1 = layer....
1
vote
1
answer
114
views
Getting only short coordinates instead of full length coordinates
I am working on OpenLayers6. And I want to show the plots.
But My plot data is not being rightly placed on original plot polygon.
What my concern is that I want to get the full-length coordinates, but ...
3
votes
1
answer
112
views
Changing columns position in attributes table using PyQGIS
Well, I'm new to PyQGIS and I was creating a new shapefile and layer using some information from other layer.
I inserted the data that I wanted inside attributes table and styled it, but I wanted the ...
0
votes
0
answers
44
views
Substraction of line feature in QGIS
I have two overlapping line features. The blue line is a intercepted feature outputted of the red line (and another polygon feature).
I need to get only the red line parts where there is no ...
2
votes
1
answer
152
views
Changing feature in one layer with feature from another layer in QGIS
I have a set of data from the UK Ordnance Survey (Zoomstack). It covers the whole of the UK. In the area I am currently interested in, it appears that one road has been incorrectly designated as a ...
5
votes
1
answer
500
views
Getting color of feature using PyQGIS
QGIS offers the @symbol_color-variable in some places. But it is missing at various places of data-defined-override/field-calculator dialogues.
I tried to create a own function, but it returns wrong, ...