vamseeachanta 1.1 PyQGIS Application Bootstrap (Headless) (+2)
1.1 PyQGIS Application Bootstrap (Headless)
import sys
import os
# Required: set QGIS prefix path before importing
os.environ["QT_QPA_PLATFORM"] = "offscreen" # headless mode
from qgis.core import QgsApplication
qgs = QgsApplication([], False) # False = no GUI
qgs.initQgis()
# Always call at end of script:
# qgs.exitQgis()
1.2 Well Locations from CSV (lat/lon)
from qgis.core import (QgsVectorLayer, QgsProject,
QgsCoordinateReferenceSystem)
# CSV with columns: well_name,latitude,longitude
uri = (
"file:///path/to/wells.csv"
"?delimiter=,"
"&xField=longitude"
"&yField=latitude"
"&crs=EPSG:4326" # WGS84 geographic
)
layer = QgsVectorLayer(uri, "wells", "delimitedtext")
if not layer.isValid():
raise RuntimeError("Failed to load CSV layer")
QgsProject.instance().addMapLayer(layer)
1.3 Supported Input Formats
| Format | Driver | Use |
|---|---|---|
| GeoPackage (.gpkg) | GPKG | Preferred vector store |
| Shapefile (.shp) | ESRI Shapefile | Legacy vector |
| GeoJSON (.geojson) | GeoJSON | Web interchange |
| GeoTIFF (.tif) | GTiff | Raster standard |
| NetCDF (.nc) | netCDF | Metocean/bathymetry |
| KML (.kml) | KML | Google Earth exchange |
| CSV + lat/lon | delimitedtext | Point data import |