Home Natural Hazard Management Sanborn products for Dolores river floodplain study

Sanborn products for Dolores river floodplain study

Craig McDaniel, vice president of Sanborn, announced that Montezuma County, Colorado, contracted with the GIS and photogrammetry industry provider aerial photography and topographic mapping for the Dolores River, located in the southwest corner of the state. Montezuma County will use the information to prepare a floodplain study of the river, which runs through the county on its way to joining the Colorado River. The Federal Emergency Management Agency (FEMA) and the U.S. Army Corps of Engineers will use the aerial photography and surface elevation data provided by Sanborn to produce an updated flood insurance rate map for the river. Located in the part of the state where the San Juan Mountains meet the desert canyon country, and home to 23,000 Coloradoans, Montezuma County will also use the data for planning and assessment purposes and for emergency services and resource analysis.

For the project, Sanborn will acquire 1″=600′ color photography, capture planimetric data, and produce digital terrain models for an area of approximately 26 square miles. The project will focus specifically on the portion of the Dolores River that starts at the tail end of McPhee Reservoir—the second largest body of water in the state—north to the county line. The compiled topographic data will be used to support the production of 0.5-foot pixel resolution digital orthophoto imagery and 2-foot contour mapping. To ensure that the new mapping meets FEMA’s Flood Hazard Mapping Program standards as well as NSSDA (National Standard for Spatial Data Accuracy) accuracy standards at 1″=100′ scale, Sanborn will establish a new control network supplemented with aerial GPS data and will complete a fully analytical aerial triangulation process. With a rich tradition of mapping dating back to 1866, Sanborn offers a full suite of GIS and photogrammetric mapping services to federal, state, and local governments, as well as private companies. The company’s core services include data acquisition, photogrammetric mapping, and data conversion. The company has offices in the United States and abroad.