Questions tagged [rule-based]
The rule-based tag has no usage guidance.
106
questions
10
votes
2answers
134 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
32 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
0answers
17 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
41 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
1answer
29 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 ...
0
votes
1answer
67 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
votes
1answer
233 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 ...
3
votes
1answer
593 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 '...
2
votes
1answer
46 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 ...
1
vote
2answers
98 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
29 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
59 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 ...
0
votes
0answers
54 views
QGIS rule-based symbolizsation - label just one rule
I have a line layer. I have created a rule-based symbology, with two rules.
Now I want to create a labeling for just one of the rules? Right now the labeling is always visible in both rules.
This is ...
1
vote
0answers
59 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:
...
0
votes
1answer
44 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
vote
1answer
27 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
vote
1answer
46 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. ...
1
vote
0answers
24 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 ...
2
votes
1answer
156 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 ...
1
vote
0answers
38 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
votes
0answers
87 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 ...
0
votes
0answers
62 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 ...
3
votes
2answers
151 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 ...
0
votes
0answers
19 views
Extruding asset along Base Polygon in CityEngine having difficulties using function insertAlongUV
I have been experimenting with CityEngine to automate modeling of repetitive structures that follows a similar design.
In this case, I'm trying to model a bridge that curves along with its length. ...
3
votes
1answer
64 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
votes
1answer
75 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 ...
5
votes
1answer
136 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
votes
2answers
150 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
votes
1answer
159 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
votes
1answer
206 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 ...
6
votes
2answers
338 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
votes
6answers
687 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 ...
0
votes
0answers
71 views
QGIS Rule-Based styles fail to render
I'm working with some Ordnance Survey data, specifically the VectorMap Local (in GML format, October 2018) set and attempting to style the layers using the very handy OS provided stylesheets (here: OS ...
2
votes
1answer
86 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#= ...
1
vote
1answer
40 views
Drilling Rigs Rule-Based Styling
I am trying to do rule-based styling for active drilling rigs in the United States.
Basically, I want to have categorized styling (different colored dots) for all companies (field = "OpCompany") ...
2
votes
0answers
44 views
Moving individual labels & rule-based labelling in QGIS
I have been playing around with labels and came to a problem. Hopefully someone can pinpoint whether I'm doing something wrong or there is a systemic hurdle in Qgis.
Are you allowed to move labels ...
4
votes
1answer
98 views
QGIS Draw by rule
I have a point layer with several colored dots. Each dot represent a find of a bumblebee species. E.g.
red is B.terrestris
yellow is B.hypnorum.
In my attribute table I have a column named "nest" (...
2
votes
1answer
108 views
Catching signal when rule toggles (active/inactive) using PyQGIS?
I would like to catch a signal when a rule within a rule based layer toggles visibility. How to permanently check this
layer.renderer().rootRule().children()[0].active()==True
the same way we can ...
2
votes
1answer
128 views
Possible to set color based on attribute while using 2.5D symbology?
I'm using 2.5D symbology to have my features display at different heights based on a certain attribute, but would also like the features displayed as different colors based on another attribute.
Is ...
1
vote
1answer
217 views
Rule-based labeling using Atlas - QGIS.3.6.2
I'm working with two shapes, both of them have a common field called "ID". I need the atlas to filter, only the id that I need to use, in the two layers.
The point layer has an entry point and an ...
1
vote
2answers
49 views
How to make appear values above the mean on rule based labeling QGIS
I've been looking at the other questions relating to rule based labeling but I haven't found any answer to my query.
I have polygons with average literacy rate for each canton of a country and ...
5
votes
1answer
136 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 ...
0
votes
1answer
66 views
Style a feature in one layer based on an attribute in another layer in Print Composer Atlas
I have two layers; one is the foreground and the other a background. Both layers have fields containing similar values (field values in the foreground layer (mun_code) is also present in the ...
1
vote
0answers
36 views
Detecting checking/unchecking of rules in a rule-based rendering using PyQgis [closed]
Is it possible to programmatically detect checking/unchecking changes of a rule in a rule-based rendering ? I found no indication of existing signals ..
I got lost reading QgsVectorLayerRenderer ...
2
votes
0answers
43 views
Save QGIS style created with espression string builder
I created a rule-based renderer with espression string builder, where I also use the function editor in Python. When I share the style (qml) file with others, I realized that the Python function I ...
1
vote
2answers
80 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 ...
1
vote
2answers
117 views
Altas with rules on different layer than the cover layer [duplicate]
I need to generate an atlas based on a polygon shapefile, but I'd like to see just what is inside the polygon itself. Maybe with rules that involves other shape's attributes. Any suggestion?
1
vote
1answer
93 views
Rule based styling in Qgis using a combination of attribute(get_feature()) and ILIKE
I Have 2 Layers:
I want to Filter Layer 2 by an attribute from Layer1 for some rule based styles. I'm currently using following expression to realize that:
"C1" = attribute(get_feature(‘Layer 1', '...
1
vote
0answers
61 views
How to add rules to the topology from a .rul in ArcPy
I am trying to create a new topology using and ArcPy script and I have a lot of rules inside a .rul archive. The function to do that is:
arcpy.AddRuleToTopology_management(out_topo, rule_type, in_fc1,...
2
votes
1answer
144 views
QGIS raster rule-based coloring
I have a raster with different values (negative and positive). I want to color the raster based on a rule: All positive values have a certain color and all negative another. I don't want to use '...
