WCH-CD: A very-high-resolution dataset for architectural change detection in World Cultural Heritage sites

The dataset is organized into three directories: T1, T2, and GT. The T1 directory contains the first-temporal remote-sensing images, the T2 directory contains the corresponding second-temporal images, and the GT directory contains the change labels. In the GT masks, pixel values of 0, 1, and 255 denote unchanged areas, changed areas, and ignored data, respectively. Images with the same filename in T1, T2, and GT form one paired sample. The repository includes 23,725 image pairs containing change samples, and 50,000 extra image pairs without change samples.