Creating spatial bookmarks from existing layer using QGIS?

Question

I have a layer with counties. I would like to import the bounding box of each county as a spatial bookmark and name it accordingly. Is this possible?

Answer 1

If you want to add details to the bookmarks such as the names or the project names then I think the only method is to access the SQLite database which stores these bookmarks. Using this great link as a guide, you could try running the following where you can define the field name, project name and the CRS:

import sqlite3
layer = iface.activeLayer()

dbPath = QgsApplication.qgisUserDbFilePath()
# if QGIS v3.14 or later, use following line instead:
# dbPath = QgsApplication.qgisUserDatabaseFilePath()

db = sqlite3.connect(dbPath)
cursor = db.cursor()

# Define the following information
fieldName = 'Name'
projectName = 'Scotland'
SRID = '27700'

for feat in layer.getFeatures():
    rect = feat.geometry().boundingBox()
    cursor.execute("""INSERT INTO tbl_bookmarks(bookmark_id, name, project_name,xmin, ymin, xmax, ymax,projection_srid)
        VALUES(NULL, '""" + feat[fieldName] + """', '""" + projectName + """', """ + 
        '%f,%f,%f,%f'%(rect.xMinimum(),rect.yMinimum(),rect.xMaximum(),rect.yMaximum()) + """, """ + 
        SRID + """)""")

db.commit()

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Example:

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Notes:

1. The bookmarks panel is not immediately updated, you will need to add a new bookmark to see the panel refreshed.

2. I had an issue with the Projection CRS. My layer's CRS was set at EPSG:27700 but setting the projection to the same CRS resulted in a transformation error. I had to set the projection to EPSG:4326 to rectify it (I also had OTF disabled).