BLM/BIA Cadastral Surveys with Remote Sensing Imagery Assistance
BLM Utah is conducting river shoreline surveys with the Bureau of Indian Affairs (BIA). Many of the rivers are located in very steep sandstone cliff formations that are hundreds of feet deep and are dangerous or inaccessible to surveyors. To delineate the current shorelines of some of the most challenging areas along the San Juan and Green Rivers, we used National Agriculture Imagery Program (NAIP) 2011 imagery. The imagery was georectified using ground survey data—X, Y, and Z coordinates—collected at accessible field points that were distinctive on the aerial photographs.