Convert Autocad Coordinates To Google Earth «EXTENDED »»

Author: [Your Name] Affiliation: [Your University/Company] Date: April 14, 2026 Abstract The integration of Computer-Aided Design (CAD) data with Geographic Information Systems (GIS) is a persistent challenge in civil engineering, urban planning, and environmental monitoring. AutoCAD typically operates in local or arbitrary Cartesian coordinate systems (X, Y), while Google Earth requires absolute geospatial referencing (latitude, longitude, and altitude in WGS84). This paper presents a structured methodology for converting AutoCAD coordinates to Google Earth-compatible KML/KMZ formats. The approach involves: (1) identifying control points with known real-world coordinates, (2) applying a 2D Helmert (similarity) transformation to correct for rotation, translation, and scaling, and (3) vertical datum adjustment from local orthometric heights to ellipsoidal heights (WGS84). A case study using a site plan of a university campus demonstrates that the proposed method achieves a horizontal accuracy of ±0.5 m when at least three control points are used. The paper concludes with a practical Python script and QGIS/AutoCAD Map 3D workflows for automation.

The final KML overlaid on Google Earth showed alignment within 0.5 m of satellite imagery, sufficient for conceptual design and site analysis. import numpy as np from pyproj import Transformer import simplekml def autocad_to_google_earth(auto_points, control_pairs, utm_zone): # auto_points: list of (x, y) in AutoCAD # control_pairs: [ (ac_x, ac_y, lat, lon) ] # Step 1: project lat/lon to UTM transformer = Transformer.from_crs("EPSG:4326", f"EPSG:utm_zone") target_utm = [transformer.transform(lat, lon) for (_, _, lat, lon) in control_pairs] source_ac = [(x, y) for (x, y, _, _) in control_pairs] convert autocad coordinates to google earth

from pyproj import Transformer transformer = Transformer.from_crs("EPSG:4326", "EPSG:32618") # WGS84 to UTM 18N easting, northing = transformer.transform(lat, lon) Find parameters: translation (Tx, Ty), rotation (θ), scale (s). System: E = s*(X*cosθ – Y*sinθ) + Tx N = s*(X*sinθ + Y*cosθ) + Ty The approach involves: (1) identifying control points with