Viewshed GeoTIFF for Casa Negra

These are the "robust" viewsheds as calculated for
Ruth M. Van Dyke, R. Kyle Bocinsky, Tucker Robinson, and Thomas C. Windes, Great houses, shrines, and high places: Intervisibility in the Chacoan World, American Antiquity 81, pp. 205–230 (2016).

本数据集即为 Ruth M. Van Dyke、R. Kyle Bocinsky、Tucker Robinson 及 Thomas C. Windes 于《美国古物学（American Antiquity）》第81卷第205–230页（2016年）刊发的论文《大型建筑、圣所与高地：查科世界中的视线互通性》中所计算的稳健可视域（robust viewsheds）。