Questions tagged [rule-based]

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40 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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1answer
41 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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1answer
20 views

Using Rules to check NonBlank entries

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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1answer
34 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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2answers
96 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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1answer
67 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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50 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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37 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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24 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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43 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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14 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=...
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0answers
43 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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2answers
82 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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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 ?
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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.
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0answers
21 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 ...
3
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1answer
70 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
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1answer
83 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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28 views

Move labels with rules generate overlap

If I move the layer's labels with the move label tool my label is overlapping. The labels are categorized by rule My rule are based on two field "column1" and "column2" I can't ...
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2answers
303 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 ...
3
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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 ...
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0answers
22 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
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1answer
54 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
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1answer
34 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 ...
2
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2answers
83 views

Symbology Based on Meeting Criteria

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 ...
8
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1answer
803 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 ...
4
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1answer
2k 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 "Primary" has '...
3
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1answer
74 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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2answers
154 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
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1answer
41 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
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1answer
145 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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0answers
66 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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1answer
52 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 ...
1
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1answer
35 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....
1
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1answer
63 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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0answers
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 ...
3
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1answer
248 views

Using Rule-based/Geometry generator style in QGIS

I have layer for comments in qgis, symbology style is rule based with Geometry generator. Problem is with displaying name in layers tab because the line before text is too long How do I solve the ...
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0answers
41 views

Labeling rule depending on whether label fits in polygon

I'm labeling some country polygons with their names. The data have one attribute with the full country name and another one with a short version (e.g. Sweden/SE). I want to label the countries with ...
2
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0answers
104 views

Projecting GeoTIFF onto shaped roofs using CGA rules

I am working with CityEngine 2019.1 and would like to project a GeoTIFF as a texutre onto shaped roofs of 3D-buildings. Currently I am trying with the following code which essentials are described on ...
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0answers
108 views

How to set fixed distance labels from data defined centroid in QGIS (3.4)

I have a labelling issue in QGIS (using 3.4, but haven't tried in other versions). I have polygons for which I show an id number as well as some data information in the labels. I've used rule-based ...
5
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2answers
337 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 ...
3
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1answer
69 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 ...
3
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1answer
78 views

Using the field calculator in rule based symbology

I am trying to categorise my site points by species group with rule based symbology; e.g. bat uses the formula "Group"='Bat' But I would also like to have a different symbol for where there are ...
6
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1answer
169 views

Rule-based labeling with optional second field

I need to label some polygons with 2 fields using only one label: The first being a field in the attribute table named "Bio-Code" the second one being optional if a cell in the field "BBT-Code" is ...
2
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2answers
244 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. ...
8
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1answer
198 views

QGIS can't detect negative values?

I'm working with the last version of QGIS (3.8.3-Zanzibar), and I'm trying to represent a Rule-Based Symbology from a CSV file with the following rules: And the data from the prcptot column is this: ...
3
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1answer
274 views

Can qgis2web display rule-based layer style?

I’ve just made a map that has two layers: one that contains the polygons and other that contains points. For the last one, I used rule-based symbology where I define the size and colour of the points ...
1
vote
1answer
384 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 ...
6
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2answers
703 views

QGIS styling a legend

I am a newbie working on QGIS 3.6 / Windows 10 I need to style a legend for map with headings and sub headings The main divisions of the legend item need to be subdivided into sub-classes i.e. The ...
3
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6answers
1k views

Rule based coloured background for labeling in QGIS

I am a newbie working on QGIS 3.6 / Windows 10. I need to label a polygon layer which is categorised by colour. (pls refer to attached pic as a graphical reference) The labels need to have a ...