Questions tagged [rule-based]

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Style rule based on qgsfunction not working in QGIS 3.22 #92

I'm using a QGIS style based on a function which returns the value of a layer variable passed through a pyqgis plugin : @qgsfunction(args="auto", group="toto") def color_trajecto(...
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  • 859
3 votes
1 answer
74 views

Creating rule-based style for attribute between two values in QGIS

It seems a pretty straightforward rule but I believe I am missing something simple. Let's say I have, in my attributes table, an attribute called "NumberOfFloors", with values between 1 and ...
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1 vote
0 answers
49 views

QGIS rule-based filtering not working

I'm having a problem with rule-based filtering in QGIS. I created a rule and tested it, and it showed that it gets hits. Below shows the attributes to which I wish to apply the rules: The following ...
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3 votes
1 answer
86 views

Highlight polygons using comma delimited text coordinates QGIS

I am new to GIS. I have significant CAD experience and some limited Python knowledge, and am generally familiar with basic QGIS functions. In short, I will have several CSV files containing co-...
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7 votes
3 answers
201 views

QGIS labels with multiple rule based icon

I'm learning QGIS. I have drilling locations showing on a map with a specific SVG icon (D1 and D2). I also have my labels showing the name of the soil sample taken in each drilling and the ...
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  • 71
2 votes
1 answer
46 views

"Rule-based" background color in QGIS attribute form containers?

In QGIS attribute form Drag and Drop Designer we can choose a backgroud color for widget containers (Tabs and Group boxes): Is it possible to have rule based background colors depending on some ...
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1 vote
2 answers
35 views

Rule-Based layers not displaying in the correct order

I am having trouble with bottom layers overlapping upper ones within a rule-based layer. (screen showing the issue) It used to work just fine, I was able to create new polygons under ones previously ...
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  • 13
1 vote
1 answer
59 views

Group style groups within on layer in QGIS

I created a complex style for a layer using rule based styling. In the original project, the layer is presented in the layers panel the same way it is displayed in the layer properties, that means ...
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  • 1,478
3 votes
2 answers
117 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(...
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  • 2,283
0 votes
0 answers
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 ...
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2 votes
1 answer
72 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, ...
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  • 123
5 votes
1 answer
86 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() #...
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  • 3,547
3 votes
2 answers
103 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 ...
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  • 29
1 vote
0 answers
64 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 ...
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3 votes
0 answers
76 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 ...
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  • 39
4 votes
1 answer
76 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'). ...
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2 votes
1 answer
120 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) ...
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  • 41
1 vote
1 answer
29 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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  • 13
0 votes
0 answers
56 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 ...
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  • 13
0 votes
2 answers
346 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-...
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-2 votes
1 answer
32 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 ...
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  • 175
1 vote
1 answer
71 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 ...
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  • 83
4 votes
2 answers
176 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: ...
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  • 85
2 votes
1 answer
85 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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  • 41
0 votes
0 answers
129 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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  • 405
0 votes
0 answers
27 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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0 votes
0 answers
47 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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3 votes
0 answers
48 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 ...
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  • 117
1 vote
2 answers
230 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 ...
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2 votes
1 answer
26 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 ?
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3 votes
0 answers
23 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 ...
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4 votes
1 answer
156 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 ...
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  • 121
5 votes
1 answer
131 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(...
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  • 75
12 votes
2 answers
665 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 ...
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3 votes
1 answer
94 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 ...
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  • 3,463
1 vote
0 answers
31 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 ...
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  • 59
2 votes
1 answer
77 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 ...
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2 votes
1 answer
51 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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2 votes
2 answers
102 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 ...
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  • 29
8 votes
1 answer
2k 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 ...
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5 votes
1 answer
4k 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 "...
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  • 375
3 votes
1 answer
119 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 ...
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  • 31
1 vote
2 answers
221 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 ...
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1 vote
1 answer
60 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 ...
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  • 71
0 votes
1 answer
229 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 ...
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1 vote
0 answers
87 views

Using 1:n table relationships in rule-based symbology

I would like to use the value of a field/attribute in a parent table as a filter in an expression used to display features in the child table. Specifically, I have a 1:n relationship in my project: ...
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  • 41
0 votes
1 answer
56 views

Labeling by using different columns

I try to label a layer by using a rule based labeling. What I specifically try to do is to find an expression which says: "If column 1 shows the attribut x then label layer "Test" by the attribute of ...
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  • 641
1 vote
1 answer
54 views

QGIS different scale levels in rule-based styling - in one rule

I have a layer with 4 roadclasses. For this layer I created a rule based symbolization, with 4 rules. In every rule I filter another roadclass and set a different symbolization and scale for this rule....
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1 vote
1 answer
89 views

QGIS rule based styling - rule ordering

I’m experimenting with some rule based styling which is working really well to a point but I’m hoping it can do more. I work in school transport I’ve plotted all pupils in a certain school on the map. ...
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1 vote
0 answers
25 views

QGIS 3.4 - Symbology expression for features that have not been styled by rules [duplicate]

I have a rule based set of expressions for styling a map according to the contents of the 'Layer' field. e.g if the Layer starts with a 'C' "Layer" ILIKE 'C%' colours the line red. Is it possible ...
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