Automated Property Valuation Model with Geospatial Analysis

Create a Python script that integrates Google Sheets with GeoPandas to perform advanced property valuation. Develop a workflow that pulls real estate listing data, applies machine learning regression models for price prediction, and generates a dynamic heat map visualization. The solution should handle large datasets (50,000+ entries), incorporate latitude/longitude data, and automatically update a Google Sheets dashboard with predictive insights and confidence intervals.