Calculate Polygon Areas in GeoDataFrame

This function calculates the area of each polygon in a GeoDataFrame and returns a dictionary with polygon index as keys and their area as values.

Technology Stack : GeoPandas, Shapely

Code Type : Custom function

Code Difficulty : Intermediate

                
                    
def calculate_area_of_polygons(geo_data):
    """
    Calculate the area of each polygon in a GeoDataFrame.

    :param geo_data: GeoDataFrame containing Polygon geometries.
    :return: Dictionary with polygon index as keys and their area as values.
    """
    # Ensure the GeoDataFrame contains Polygon geometries
    if not all(isinstance(g, shapely.geometry.Polygon) for g in geo_data.geometry):
        raise ValueError("GeoDataFrame must contain Polygon geometries.")

    # Calculate the area for each polygon
    areas = geo_data.geometry.area

    # Return a dictionary with polygon index as keys and their area as values
    return {index: area for index, area in zip(geo_data.index, areas)}