How to get layer information in QGIS interface?

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 does The GetCapabilities document work in OGC?

All OGC services are self-describing, via the ‘GetCapabilities’ operation. The WMS capabilities document tells clients exactly which layers, styles, extents, image formats (and more!) a given server supports.

What is the format of a’getcapabilities’request?

Here is the format of the ‘GetCapabilities’ request: ? Here is an example of a GetCapabilities request sent to the MassGIS WMS: http://giswebservices.massgis.state.ma.us/geoserver/wms?request=GetCapabilities&service=WMS&version=1.1.1 The capabilities document is returned as XML.

What is the data source identifier in QGIS?

The data source identifier is a string and it is specific to each vector data provider. Layer’s name is used in the layer list widget. It is important to check whether the layer has been loaded successfully. If it was not, an invalid layer instance is returned. For a geopackage vector layer:

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 iterate over layers in pyqgis Python?

Then you can iterate over layers like: Because .mapLayers () returns a dictionary ( dict ), you can also use .values () method of dictionary which returns just a list which contains layers in that case. Then you can iterate over layers like: Note: After grouping I have to remove the duplicate layer so I used root.removeLayer (lyr).

What do you need to know about the QGIS browser?

QGIS Browser is one of the main panels of QGIS that lets you quickly and easily add your data to projects. It helps you navigate in your filesystem and manage geodata, regardless the type of layer (raster, vector, table), or the datasource format (plain or compressed files, database, web services).

Which is the DB manager plugin for QGIS?

The DB Manager Plugin is another one of the main and native tools to integrate and manage spatial database formats supported by QGIS (PostGIS, SpatiaLite, GeoPackage, Oracle Spatial, MSSQL, DB2, Virtual layers) in one user interface. It can be activated from the Plugins ‣ Manage and Install Plugins… menu.

How to get list of data formats in QGIS?

To have a list of available formats, run the command line ogrinfo –formats (for vector) or check settings ‣ Options ‣ GDAL menu (for raster) in QGIS. QGIS Browser is one of the main panels of QGIS that lets you quickly and easily add your data to projects.

What’s the best way to learn Python and QGIS?

Even if you are a beginner, learning a little bit of Python and QGIS programming interface will allow you to be much more productive in your work. This tutorial assumes no prior programming knowledge and is intended to give an introduction to python scripting in QGIS (PyQGIS).

How to get list of selected features in QGIS?

As before, you would get a list of selected features with iface.activeLayer ().selectedFeatures (), however in QGIS versions >= 2.0 you now use the function QgsFeature.attributes () instead of QgsFeature.attributeMap ().

Where to find pyhon bindings in QGIS install?

Relevant pyhon bindings are included in the QGIS install on Windows. But to use them from the plugin folder, we need to indicate the path to the QGIS install. Create a Windows Batch file (.bat extension) with the following content and save it on your computer as compile.bat. We will later copy this file to the plugin folder.

How to add vector and raster layers in Python?

Add vector, raster and mesh layers to your map by double-clicking, dragging onto the map canvas or clicking the Add Selected Layers button (after selecting layers) Run Python scripts (including Processing algorithms) by double-clicking or dragging onto the map canvas

How is the browser panel organized in QGIS?

The browser panel ( Fig. 8.1) is organised as an expandable hierarchy with some fixed top-level entries that organise the resources handled by the browser. Node entries are expanded by clicking on to the left of the entry name. A branch is collapsed by clicking on .

Can you drag layers to browser panel in Python?

Python scripts, Processing scripts and Processing models can also be opened for editing in an external editor and the graphical modeller. You can drag and drop layers from the Layers panel to the Browser panel, for instance into a GeoPackage or a PostGIS database.

How to create a QGIS map in Python?

From the python console, this code would produce a simple screen capture of the area oriented around a selected feature, all active layers, and any activated labels: If you know the coordinates of your rectangles, you can uses following code: Thanks for contributing an answer to Geographic Information Systems Stack Exchange!

How to define the extent of a QGIS map?

Currently I am just using the simple rendering technique outlined here: http://www.qgis.org/pyqgis-cookbook/composer.html#simple-rendering I have failed, however, at adapting this code to define a specific extent. I provide the code below. The only examples that I can find that show how to change extent involve creating a MapCanvas.

How to get the extent from a vector or raster?

If you already know How to load a layer in QGIS using Python, you may run the following code: for getting the extent of a vector or raster layer. Instead, using this code: you will get the extent of the current feature (it only works for vector layers).

How to load and symbolize vector layers in pyqgis?

In the code editor, or console, create a variable containing the path to your raster file. Now we’ll simultaneously assign the vector layer to the layer variable and load it into the QGIS interface. We need to provide a layer and data provider.

Where to find country layer name in pyqgis?

This information can be found in the layer properties. Note how the source contains the path to the geopackage as well as information about the country layer’s layer name: If you are not using QGIS 3 yet, the above dialog will look different but it contains the same information.

How to add and delete fields in pyqgis?

Before deleting fields you may want to loop through the existing fields and print field names to the console. This can be done as follows. The output will be field names. We delete fields in a very similar way to adding fields. First check the layer capabilities, delete fields, and update fields.

How to read the attribute values using pyqgis?

Once you have a QgsFeature object you can use the attributes () method to retrieve the attributes (a.k.a. columns or fields) associated with that feature (a.k.a. row), e.g.: If you want to index the field by it’s name, rather than a number, you need to use the field mappings: