Resource provided by WisconsinView. This data represents a LiDAR-derived hill shade image for Trempealeau County, Wisconsin in 2014. The dataset is in WTM coordinates(EPSG 3071). Hillshading is a technique used to visualize terrain as shaded relief, illuminating it with a hypothetical light source. The illumination value for each raster cell is determined by its orientation to the light source, which is based on slope and aspect.