How to make a layer visible in Python?
I’m new at Python but for a school project, I have to write a small program, which, if it gets activated, makes an “invisible” layer visible. Seriously, I do not know, where to start. I tried it with that code:
How to set layer visibility in pyqgis 2.4?
Im having a problem toggling the visibility of map layers in pyqgis (2.4). I have a simple interface, just the map canvas, no legend, and basically a radio button that toggles between two raster layers.
How to load the vector layer in QGIS?
You will need the sample census tract shapefile available as a zip file here: Extract the zipped layer to a directory named census in your qgis_data directory. How to do it… We will load the vector layer, toggle scale-based visibility, set the visibility range, and then add the layer to the map.
When does a GIS layer only make sense?
Sometimes a GIS layer only makes sense when displayed at a certain scale.For example a complex road network. PyQGIS supports scale-based visibility to programmatically set the scale range in which a layer is displayed. In this recipe, we’ll investigate scale dependent layers.
How is the qgsvectorlayer constructed in QGIS?
The QgsVectorLayer is constructed by instantiating a data provider. The provider interprets the supplied path (url) of the data source to connect to and access the data. path ( str = ”) – The path or url of the parameter.
Can a QGIS expression be an OGC filter?
The ‘FILTER’ key value can either be a QGIS expression or an OGC XML filter. If the value is set to a QGIS expression the driver will turn it into OGC XML filter before passing it to the WFS server.
How to get layer information in QGIS interface?
You can type directly into the console, or select the pad and paper icon to write code in the editor. I prefer to write code in the editor because it allows me to save my work and run a compilation of commands. The simplest way to get layer information from layers in the QGIS interface is to use the layer name.
How to manage layer visibility in ArcGIS 10?
Managing layer visibility and selections with the table of contents’ List By Visibility mode The table of contents in ArcGIS 10 has several ways of listing the layers in the map: by drawing order, source location of the data, whether layers are visible, and whether layers are selectable.
How are layers organized in list by visibility?
With List By Visibility, the table of contents sorts automatically as I zoom the map and turn layers on and off. Layers are grouped by whether they are shown on the map and are categorized by Visible, Out of Scale Range, or Not Visible.