Questions tagged [rule-based]

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16 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 ...
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0answers
17 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. ...
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1answer
67 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 ...
3
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0answers
32 views

Label only the maximum value when I zoomed out or print in smaller scale using QGIS

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 ...
5
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2answers
79 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 ...
5
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1answer
85 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 ...
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1answer
65 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. ...
3
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1answer
113 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 ...
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3answers
310 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 ...
8
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1answer
126 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
81 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
45 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#= ...
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6answers
168 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 ...
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1answer
42 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 ...
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0answers
43 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 ...
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0answers
16 views

Displacing points by rules without losing colours using QGIS?

In QGIS, I managing a layer by rules but some points are so close, and I used the function displacement points (By rules) but all the symbols that I used turned black on the map, they lost the colours ...
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1answer
33 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") ...
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1answer
58 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', '...
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0answers
23 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
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1answer
86 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
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1answer
69 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 ...
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0answers
62 views

How to use knowledge engineer in Erdas Imagine for rule based classification

I want to use rule based classification in knowledge engineer section of erdas imagine software. But I don't know how to create a *.ckb file. Can somebody point me to some reference material or ...
2
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1answer
55 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 ...
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1answer
130 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 ...
2
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1answer
359 views

Adding new rule by using QgsRuleBasedRenderer to existing one in PyQGIS?

I want to add new rules for a layer. However when I add them previous one(s) are deleted. Here is my code: layer = iface.activeLayer() symbol = QgsSymbol.defaultSymbol(layer.geometryType()) renderer =...
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2answers
46 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 ...
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1answer
52 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 ...
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0answers
34 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
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0answers
39 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 ...
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0answers
42 views

Symbology or style to separate layers

I have a layer i.e. vegetation, i can split this layer in different colors using rules or categories i.e. light green = grass, darkgreen = trees. Then the colors appear 'nested the layer. When i make ...
1
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2answers
68 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?
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0answers
36 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,...
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1answer
82 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 '...
1
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1answer
84 views

Rule-based rendering in qgis2web client is not working

I made a simple map with polygons of the staates of africa and used the rule-based renderer for different colors to tint them. When I tried to load or export this map with qqis2web I didn't get ...
2
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1answer
175 views

QGIS 3 - Variables in rule-based rendering?

I'll try and lay this out clearly, I have most of it covered, but there's a very specific thing I'm looking for in the rules - whether or not it can be done and if so, how? Key things I have done and/...
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0answers
146 views

Rule-Based Styling not working in QGIS?

I'm trying to create a shapefile I can use as a template for a breeding bird survey. The basic gist was that each species has a two letter code and a colour depending on the BTO listing. Each bird is ...
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0answers
65 views

Multi line rule based labels in QGIS [duplicate]

I have created rule based categories for my symbology, and I would like to have multi line labels to go along with these. At the moment, I have written some expressions for specific cases, in which a ...
2
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1answer
139 views

Rule based styling with select-by-intersection syntax

I want to do rule based styling for a selection of gridded polygons dependent on their position relating to another layer. I want to show the polygon that a point feature based in an atlas falls ...
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1answer
63 views

Rule-based styling window freeze in QGIS 2.18.16-22

While I was working on cartographic files (QGIS 2.18.16 - Linux Mint 18.1) using the rule-based styling window, suddenly the window and the program freeze and I can not longer work on editing. By ...
2
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1answer
216 views

Qgis 2.18.14 - rulebased and categorized style in atlas

I am currently generating an atlas. I have four parts of a map, showed on each page. For the map I have a lot of polygons styled in different colours after category. Now I need to make a rulebased ...
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0answers
45 views

QGIS - Rule-based Symbology - Added Ranges do not carry over Legend entries [closed]

When I add ranges to a rule, under Rule-based Symbology, the auto-populated (or modified) legend values do not carry over. To fix this, I would have to manually change each line in the legend ...
2
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2answers
273 views

QGIS Atlas map composition to show only points inside Polygon?

I want to create an atlas map where I have some 40 polygons, 100 points and 200 lines as different shapefile. Now I want to automate the atlas map preparation for each polygon and needs to show the ...
1
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1answer
34 views

Add a scale or category to a rule which is only applied to points within original subset in QGIS

I have subset a shapefile of points to only include those having a value of (for example) 33 in the variable "Bout" using a rule based assignation: Now I would like to apply a sub-category to that ...
2
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2answers
67 views

Displaying 2 different color lines based on 2 different table attributes in QGIS?

I have a line shapefile that has a bunch of data and it is broken down into different features which is assigned a different number. It is then styled on the rule based approach so each feature gets a ...
1
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1answer
412 views

Rule based labeling in rule based styles

I have got a layer with distance vectors between polygons. This layer has a rule based style where I can check each polygon to show only the vectors with contact to the polygon. Each vector has as an ...
4
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0answers
83 views

QGIS rule based symbology for rasters in Atlas?

I'm making species distribution maps and have got the Atlas working perfectly using a polygon layer to show the quarter degree grid cells for species observation records. I have ~ 250 species. Problem ...
3
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2answers
506 views

Displaying map labels over coordinate grid in QGIS?

My grid overlaps labels placed on a map. Is there a way of forcing the labels to be displayed in front/on top and the grid placed behind the text? Despite looking I cannot find a solution. Using ...
3
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1answer
153 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 rulebased style varies. Is ...
2
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1answer
28 views

How to find objects which are styled twice (in rule based styling) in QGIS 2.18.10

I have the problem of a complex rule based styling (with 10 different styles and multi-line rules in each style) with several thousands objects. My problem is that the sum of all styled objects in one ...
2
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0answers
137 views

Set a rule for grow region in eCognition

I am using the grow region algorithm in eCognition sofrware in order to merge my candidate class. I want to set the rule : two candidated objects are merged only if the length/width ratio of the ...