North dakota phase III landslide inventory: mapping active landslides in the bismarck 1:100,000 quadrangleproject period: 07 01 2025 07 01 2026THE first north dakota geological survey landslide…

North dakota phase III landslide inventory: mapping active landslides in the bismarck 1:100,000 quadrangleproject period: 07 01 2025 07 01 2026THE first north dakota geological survey landslide inventory map (about 300 1:24,000 scalequadrangle maps) was published in 2003 during phase i of the north dakota geological surveyslandslide mapping program. Landslides were delineated by hand using stereo projection of blackand white 1:20,000 scale aerial photographs taken during the 1950S and 1960S. Phase II started IN2017 with the goal to map landslides for the entire state using lidar, and now phase III is mappingactive landslides utilizing repeat lidar coverages. Geologists at the north dakota geologicalsurvey calculate the difference between the two lidar collects to locate movement and, oncedetermined to be a landslide, delineate the feature. This award would fund phase III in the BISMARCK1:100,000 quadrangle in central north dakota. The project area contains both state and federalland in landslide prone areas, along with urban infrastructure, some of which have been impactedrecently by landslides. Mapping active landslides provides a dataset that the public, government, and industry leaders can use to make informed decisions concerning private and industryinfrastructure installation. Alongside commercial applications, further development of ourstatewide active landslide dataset creates an invaluable asset for studying the nature of landslideoccurrence. The bismarck 1:100,000 area now has multiple lidar datasets, one of which is 3DEP.