Generate Grids for Dispersed Study Regions Based on Regional Extents

generate_mult_grid.py

from qgis import *
import processing

proj_path = QgsProject.instance().readPath("./")

layers = iface.mapCanvas().layers()

for n, i in enumerate(layers):
    ext = i.extent()
    size = 5280
    margin = size/2
    xmin = ext.xMinimum() - margin
    xmax = ext.xMaximum() + margin
    ymin = ext.yMinimum() - margin
    ymax = ext.yMaximum() + margin
    geom_name = i.name() + '_grid'
    
    geom_loc = proj_path + '/' + geom_name + '.shp'
    parameters = {'TYPE': 4,
        'EXTENT': '%f, %f, %f, %f' % (xmin, xmax, ymin, ymax),
        'HSPACING': size,
        'VSPACING': size,
        'HOVERLAY': 0.0,
        'VOVERLAY': 0.0,
        'CRS': QgsCoordinateReferenceSystem(i.crs().authid()),
        'OUTPUT': 'memory:grid'
    }
    grid = processing.run('qgis:creategrid', parameters)
    
    geom_parameters = {
        'CALC_METHOD': 0,
        'INPUT': grid['OUTPUT'],
        'OUTPUT': QgsProcessingOutputLayerDefinition(geom_loc)
    }
    processing.runAndLoadResults('qgis:exportaddgeometrycolumns', geom_parameters)