Questions tagged [rule-based]

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2answers
165 views

Rule-based styles don't work in QGIS (points don't appear)

I took a very good course on QGIS from Udemy (GIS in QGIS 3 for beginners) and made a pretty complex map with it. A month or so afterwards, I made a pretty simple map without any problems using a rule-...
3
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2answers
90 views

Referring to rule style in expression string builder in QGIS

I'm working with QGIS 3.16 Hannover. I've got a rule-styled polygon layer cuadric_cabañ. Rules are: overlay_intersects(layer:='habitat_caba',filter:=(CODIIGE=210 OR CODIIGE=320)) overlay_intersects(...
2
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1answer
42 views

QGIS Symbology: how to make a symbol a shape according to a set of rules and a color according to another set of rules

I'm using QGIS 3.14 with GRASS 7.8.3. I have a data set with point coordinates on a plan (artifacts on an archaeological site). I have two main variables that I want to show. So, I'd like to have the ...
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0answers
25 views

Buffer around lines with rules or expressions

I need to create buffers around a layer of lines that represent infrastructures and they are symbolized according to the type (roads, railway, waterway and electric cables). Is there any way to create ...
2
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2answers
94 views

Symbology Based on Meeting Criteria using QGIS

I have a dataset that includes populations and subpopulations, so for each main population there may be several subpopulations. I have organised this in the table so that a population has the same ...
2
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1answer
36 views

"Eval Error" when selectively rendering raster layers in QGIS Atlas

Using the Atlas feature in the QGIS print composer, it is possible to use rule-based symbology to show/hide components of vector layers as required or defined by the Atlas? I have multiple pages, ...
5
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1answer
58 views

Propagating symbology changes made with PyQGIS to Layer Styling Panel

I am using a script to change the opacity on a rule-based symbology. layer = iface.activeLayer() opacity = 0.2 if layer.renderer().type() == 'RuleRenderer': renderer = layer.renderer() #...
3
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3answers
1k views

Multiple overriding rules for styling in QGIS 3.4.0

I am a total beginner to QGIS and still struggling with the basics. After a quick research on this forum I could not find the answer to my current issue. What I am trying to do is to colour the ...
3
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2answers
66 views

QGIS rule-based labelling base on active map layers

I'm new to QGIS. I'm currently using the new version 3.20.0 Odense and I have some troubles setting up the rule-based labelling for a layer. Essentially, what I need is to automatically swap labels ...
5
votes
1answer
180 views

Nested rules in QGIS 2.18

I work with QGIS 2.18. I have a polygon shapefile with two atrributes: id (unique for each polygon) and type. I visualize the shapefile using the "type" attribute, but I would like to add a nested ...
-2
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1answer
29 views

Using Rules to check NonBlank entries in QGIS [closed]

I am trying use Rules in Symbology to display entries based on a criteria. The criteria is display only those entries which have a date associated with them. I have table of points which has Date ...
1
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0answers
55 views

Rule based symbology in QGIS [closed]

I want to make a rule-based symbology with two classes: one class with all the empty cells in a given column and one class for the cells that do have a value in it. In Excel I would use something like ...
5
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1answer
3k views

Rule-based symbology in QGIS

I'm trying to create the following rule based expression for displaying a line: if column "riparian Veg" has a 'Yes' entered into it then display the line but if another column titled "...
3
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0answers
45 views

Auto updating rule based symbology categorised by date

I have a shapefile of "Detection Points". These have a "strength" attribute and a "date" on which each was made. Data collection is ongoing - that is it began in April ...
2
votes
1answer
108 views

Rule-based symbol for point within polygon in QGIS

I would like to use a set of rules to draw features from a point_layer that are within a polygon_layer. Points that answer true to ("VAL_PROTECTION_EP3" = '1' AND "TYPE" = 1) ...
4
votes
1answer
63 views

Filtering on centroid distance between layers in Rule based layer styling in QGIS

By using Rule based layer styling for a polygon shapefile I want to display only those features whose centroid is separated by 1.000m from the feature centroids of another polygon layer ('layerB'). ...
1
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1answer
26 views

Setting expression for two different table attribute to store as default style

I'm new on QGIS. I would like to store a default style in geopackage use by two different table attribute. First table with "building_height" , and second table with "block_height"....
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0answers
49 views

How to efficiently filter and select attributes based on conditional formatting?

I am wishing to filter my attribute table to display only certain values that meet certain criteria based on multiple column values. For example, I want to show all locations on my map that are Lost ...
1
vote
1answer
55 views

PYQGIS rule-based renderer with SVG symbols

I am trying to create a rule-based renderer with different SVG icons for each class. For some reason, I keep getting the error : Rule' object has no attribute 'QgsSvgMarkerSymbolLayer' Why do I get ...
4
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2answers
122 views

Setting different font color types from the same field in rule-based labeling in QGIS

Trying to set different font color types from the same field in rule-based labeling in QGIS. I have a "C°" field with only 2 values: +56.7 C° and -89.2 C°. Trying this expression to have it: ...
2
votes
1answer
78 views

Usage of QgsRuleBased3DRenderer with PyQGIS

I'm trying to use QgsRuleBased3DRenderer with PyQGIS in order to set different color in a 3D view. I'm trying to make something similar to this but with the 3D syntax (here is the 3D syntax: https://...
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0answers
86 views

QGIS - label color setting

I use rule-based labeling with geometry generator on line layer. I use expression @symbol_color, because I want to have color of labels the same as color of lines. However, @symbol_color doesn't work ...
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0answers
42 views

QGIS rule-based labeling with callouts

I have line layer with callouts created in geometry generator. Then I create labels created by expressions rule-based labeling. How can I create expression refering to labels with callouts ? I want ...
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0answers
44 views

Cannot Load Rule Based Label with QGIS

Working with QGIS, I saved my Rule Based Label as a .qml file. Opened a new Project Loaded the Shapefile and then Loaded the Style .qml file but it lost its rule based styling, x and y displacements ...
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0answers
26 views

Merged Shapefile with different Styles

QGIS Zurich 3.18.2 Need to pass on a Shapefile to A Nother. There were three Layers each with assigned Label Style (saved) as can be seen Yes I know I have a lot more work to do on the Label placement/...
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0answers
22 views

QGIS : On layers using my custom function and also having a Rule (Filter) the Vertex Tool is not working

I am using QGIS 3.16. To show my problem in details, I have made a very simple test example : Create New Shapefile Layer File name : Test Geometry type : Line OK Scale : 1:1000 Draw a line id=...
3
votes
0answers
47 views

Arranging rulebased symbology alphabeticaly

QGIS version 3.16.4 I'm working with a layer that has a lot of different items in rulebased symbology. But they seem to be ordered randomly. Is it possible to arrange them alphabeticaly? I'm hoping ...
0
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0answers
26 views

Adding categories classification to rule

How do I add sub categories to a rule with automatic classification as I modify a field? Basically I want to give the chance to display each single new feature.
3
votes
1answer
85 views

How can I load and draw predefined chart images (diagrams) rule based and related to a point vector layer with QGIS

I have a bunch of diagrams for a set of route segments, stored as PNG, PDF or SVG with a regular name (topic-segment-id.(png|pdf|svg) for example), representing a certain aspect (like crossing rate or ...
1
vote
2answers
129 views

Rule-based symbology based on related layer in QGIS

I'm working with QGIS I have two layers: Layer 1: has the id and geom columns (multypolygon layer) Layer 2: has the id, gid and type columns (table layer). The value gid of layer 2 is the foreign ...
2
votes
1answer
20 views

Marker line in rule-based layer?

In a line layer, which is rule-based rendered : As I can see it, it is only possible to ad simple lines. I want to ad a marker line. Is that not possible ?
1
vote
1answer
483 views

Line at map scale that do not vanish when zoomed out? (QGIS 3.8)

I'm drawing rivers and roads as linestrings with width set in map units from an attribute. When zooming out, of course they vanish quickly, because 10, 20 or 100m is less than a pixel at 1:100,000 ...
3
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1answer
92 views

Applying Rule-Based Style taken from another layer to layer with no geometry

I have two layers "Suburb_Type", that has more than 1000 suburbs in shapes and is styled with categorisation rule. (columns: 'suburb_code', 'geometry', 'category_variable') "Suburbs_in_Study", with ...
5
votes
1answer
231 views

Dynamic legendlabel for a rule-based style

I have a rule-based style that is linked to a print-composer. In that composer I activated the atlas-function with a filter. Because of that filter the outcome of the rule-based style varies. Is ...
3
votes
0answers
22 views

How to prevent not visible objects (scale rules) from being identified?

In Symbology tab I am using rule-based symbols and I have defined visibility rules dependent on the minimum scale. Above some scale threshold some features are not visible as I expected. But when I am ...
4
votes
1answer
98 views

Stretch label all along line length

I need to know if in QGIS 3.16 there is a method to stretch a label all along line length. My layer has lines with different length and I want to know if is possible to stretch automatically labels ...
5
votes
1answer
107 views

Removing an empty entry rule by using QgsRuleBasedRenderer without affect other rules filled in PyQGIS?

I create rules with this code but it creates one more but without data and when using root_rule.removeChildAt (0) it deletes a correct one. layer = iface.activeLayer() symbol = QgsSymbol.defaultSymbol(...
8
votes
1answer
1k views

Place label along line near start and end of line in QGIS

I have four fields managing the numbering of the start and end of road sections. I created two label rules, one for the start and one for the end of the road sections. I set the position of the ...
2
votes
1answer
1k views

Managing rule-based renderer in PyQGIS?

This is my first project in QGIS and I'm also quite new to Python. PyQGIS is more than a challenge for me! I found code in How to programmatically set a rule-based renderer in QGIS? to set a rule ...
10
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2answers
488 views

Rule-based symbology based on current selection in QGIS

I have two oracle layer (point(p1) and polygon(pl1)). I want to build a rule-based symbology which is based on current selection on two cases: Case 1- When I select a point from table p1, I want that ...
1
vote
0answers
26 views

Action on filtered objects QGIS

I have got a point layer with about 1000 points. These point has a rule based symbology. So far so common. In this layer I have also some actions implemented. If I unselect some rules, that only the ...
2
votes
1answer
122 views

Features color based on layer's color in QGIS

Is there a way to synchronize the selection color with a layer's color in QGIS?. Following this post https://gis.stackexchange.com/questions/111784/displaying-only-selected-features-on-map-in-qgis#= ...
2
votes
1answer
64 views

Rule Based styling with different forms and colors

I have a map about different locations of amphibians. I want that the colors illustrates the specific species and the form illustrates the stadium (young, adult). I know how to give different colors ...
1
vote
2answers
100 views

Rule for labeling ways not being part of OSM relation in QGIS

A brief overview of what I want to achieve: Create a map showing all cross-country ski trails in a specific region with some customizations/styling on them. The data come from OpenStreetMap ...
3
votes
1answer
85 views

Labeling only maximum value when zoomed out or print in smaller scale

I would like to prioritise the maximum values to be shown on the map. In other words, when the label collides it should drop out the minimum values. In the shown examples, I would like to have ...
2
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2answers
289 views

How to export layers with rule based symbology with qgis2web

I am working as volunteer on a simple map for an NGO, I have some point layers with rule-based symbology. When I load these layers in qgis2web the symbology disappears, both in Leaflet and OpenLayers. ...
5
votes
2answers
446 views

Save Rule Based Symbology as Default Layer Style

I am constantly moving layers in and out of my projects, I was able to set default style for layers and they all the layers I drag and drop to my project get the same style by default. Lately I have ...
1
vote
2answers
187 views

Qgis 3 - Rule-base labeling combining to backgrounds

I have a pointlayer with no symbology, but is labeled by numbers 1-74. The labels is styled with a circle background. For some of the points I need to keep the circle, but add a small SVG-symbol to ...
1
vote
1answer
49 views

Change/Hide the pen width for line shape file based on rule in QGIS

I have line shapefile, in which I have a condition to display line's width based on a rule as shown in the image below. But in this case I was not able to define line width to 0, it is taking hairline ...
0
votes
1answer
192 views

How to run multi level segmentation for LULC in process tree, eCognition software

Can we run the eCognition multi level (level 1 ,level 2,...) segmentation and classification in the same process tree? I want different outputs to show for each levels in a process tree. I'm in the ...