53
votes
Accepted
Filtering features in other layers of QGIS Atlas
Indeed, you need to use rule-based symbology to achieve what you want.
You need to create a rule for what you want to show, and ELSE rule for all others.
In the ELSE rule, deselect the symbol ...
- 13.6k
47
votes
Reading feature class in file geodatabase using R?
You can use rgdal to access feature classes in Esri file geodatabases.
require(rgdal)
# The input file geodatabase
fgdb <- "C:/path/to/your/filegeodatabase.gdb"
# List all feature classes in a ...
- 50.2k
47
votes
Accepted
How to select features containing specific text string using an expression in QGIS
You just gotta use the LIKE operator.
For example,
"TITLE" LIKE '%MINERAL CLAIM%'
The % symbol acts like a wildcard.
LIKE is case-sensitive, whereas ILIKE is not.
- 9,901
40
votes
Accepted
Displaying only selected features on map in QGIS
Kadeem's answer will prevent your features from being visible, but they will still be present, if you are trying to identify an individual ship track you may click an invisible feature by mistake. ...
- 12k
36
votes
Accepted
setStyle() function for GeoJSON features - Leaflet
This works without needing to remove the layer and recreate a new one as described above:
geojson_layer.eachLayer(function (layer) {
if(layer.feature.properties.NAME == 'feature 1') {
...
- 496
30
votes
Accepted
Changing the value of attribute using QgsFeature in PyQGIS
Answering your two questions:
You can change your feature values from the layer object, no need to access the dataProvider().
Yes, you can use the iterator in a for loop (that's what iterators are ...
- 33.5k
29
votes
Displaying properties of GeoJSON in popup on Leaflet?
The line where you create and bind your popup should have been included in the onEachFeature option of your L.geoJSON factory.
var layerGroup = L.geoJSON(data, {
onEachFeature: function (feature, ...
- 6,823
26
votes
Displaying only selected features on map in QGIS
This is now possible using just selections and a rule-based symbology.
This requires the Expression Plus plugin (for QGIS 2.x. 3.0 has the functionality built in).
Create a rule based symbology with ...
- 15.1k
23
votes
Accepted
Deleting selected features using PyQGIS
You can loop over the iterator and get the id() for every feature in it:
with edit(layer):
# build a request to filter the features based on an attribute
request = QgsFeatureRequest()....
- 26k
20
votes
Reading feature class in file geodatabase using R?
As already posted in this answer, this now also works very nicely with sf:
require(sf)
fc <- sf::st_read("C:/path/to/your/filegeodatabase.gdb", layer = "some_featureclass")
But writing into a ...
- 823
16
votes
Accepted
Can someone help me identify this part of the map?
Here you find the map including the legend. The legend is in German, but I am German, so I tried to translate it as precise as possible.
I think (and please @Giancarlo correct me, if you disagree):
...
- 874
16
votes
Accepted
Updating text column of selected features in QGIS
make sure the layer is in edit mode (otherwise changes will not happen)
Select features to change (however you like)
then open attribute table
select the attribute to change
type in what you want it ...
- 74.6k
15
votes
Zooming to feature in QGIS?
Sure it is. Depending on what you need:
zoom to whole layer
right click on layer in Layers list and first item is "Zoom to layer"
zoom to selected feature(s)
select feature in map and click on ...
- 9,186
14
votes
Displaying only selected features on map in QGIS
Kristina, I assume there is an attribute in your table which allows you to identify a single track? For example:
point_id | track_id
------------+------------
1 | 15
2 | ...
- 545
14
votes
Applying categorized symbol to each feature using PyQGIS
For those who'd like to try the code above for the PyQGIS3 version, here is my adaptation (it works for the 'active layer' if run from the console ...).
# provide file name index and field's unique ...
- 161
14
votes
Accepted
OpenLayers: Get Coordinates of drawn features
The drawn feature are added to the layer named vector. See draw interactions constructors.
// Get the array of features
var features = vector.getSource().getFeatures();
// Go through this array and ...
- 1,084
14
votes
Accepted
Getting the bounding box for each feature in the source layer in QGIS
In the Processing Toolbox (Processing Tab > Toolbox or Ctrl+Alt+T) you will find a tool called Bounding boxes. This will achieve what you want.
If your layer contains some multipart features you ...
- 1,603
13
votes
Accepted
Counting number of selected features in QGIS
Look at the header of the attribute table, it tells you the total number of objects in tables, as well as the filtered and selected ones.
- 378
13
votes
Determining number of vertices of selected object in QGIS 3
You can use the following script in QGIS Python Editor. Select a layer, run the script and select a feature.
def n_vertices(selected, _, __):
n = len(selected)
if n == 1:
g = ...
- 55.3k
13
votes
Accepted
Tying visibility of features to zoom level by attribute in QGIS
You can change the style to be rule-based (it will preserve the classes if a categorized style was previously set), and there you can control the display scale of each class/rule.
- 34.2k
13
votes
Accepted
Selecting multiple features by ID-attribute from list using PyQGIS
Use this way (without for loop):
id_list = [1, 2, 5]
layer.selectByExpression("id in {}".format(tuple(id_list)))
- 55.3k
12
votes
Accepted
Applying categorized symbol to each feature using PyQGIS
To draw a layer with a categorized renderer you first should create appropriate categories. A category needs value, symbol, and label. If you know the values at design time you may define these 3 ...
- 4,390
12
votes
Accepted
Merging spatially separated polygons into one feature in QGIS
Check the corresponding geoalgorithm in the Processing Toolbox (Ctrl+Shift+T).
For QGIS 3 : "Promote to multipart"
For QGIS 2 : "Singleparts to multipart"
- 1,765
12
votes
Accepted
Is there a maximum number of features that QGIS can save into a shapefile?
Officially, .shp and .dbf files are limited to 2GB. Using GDAL Shapefile driver this can be exceeded, but as stated on this site, this is not recommended due to compatibility issues (See point #Size ...
- 24.5k
12
votes
Accepted
Creating Virtual layer in QGIS that shows only features in extent
The trick is to create a function that access QGIS graphical interface, and that is piped to the query of the virtual layer.
Open a function editor (from anywhere, including from field calculator) ...
- 34.2k
12
votes
Accepted
Getting ordered list of IDs of selected features using PyQGIS
Use this script:
selection = []
def selection_changed(selected, deselected, clearAndSelect):
global selection
# If the user deselects feature(s), remove ID's from list
if deselected:
...
- 55.3k
12
votes
Accepted
PyQGIS getting dictionary for each feature of layer with their attribute values
QgsJsonUtils class has exportAttributes method for getting attributes as dict.
Solution 1:
Making a dictionary including feature id as key, attributes map as value:
{feature1.id: {attr1: value, attr2: ...
- 55.3k
12
votes
Accepted
Determining number of vertices of selected object in QGIS 3
num_points($geometry) returns the number of vertices of the current feature.
- 12.4k
11
votes
Feature Count in Legend (QGIS 2.18.2)
You may try a right click on your layer and then chose to Show Feature Count (green on figure):
- 6,698
11
votes
Accepted
Sorting records by attribute in shapefile using PyShp
The script you need:
features = shapefile.Reader("c:/data/cities.shp").shapeRecords()
features.sort(key=lambda feat: feat.record["NAME"]) # or ["POPULATION"]
...
- 55.3k
Only top scored, non community-wiki answers of a minimum length are eligible