LDPoly

This software contains the official implementation of LDPoly, a novel diffusion-model-based framework specifically designed for polygonal road outline extraction from high-resolution aerial imagery. It employs a dual-latent diffusion model that jointly diffuses and denoises road masks and keypoint heatmaps, which are subsequently vectorized into polygonal road outlines. The repository includes model implementation, training and inference configurations, polygonization procedures, evaluation scripts, and instructions for use. This archived version corresponds to the code associated with the ISPRS 2025 paper “LDPoly: Latent diffusion for polygonal road outline extraction in large-scale topographic mapping.”