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Maintenance responsibility for more than 25,000 miles of navigation channels and 400 ports and harbors throughout the United States requires extensive surveying and mapping services, including boundary, topographic, hydrographic, terrestrial lidar, and multispectral and hyperspectral aerial imagery collection as well as airborne topographic and bathymetric lidar acquisition, project-level GIS implementation, development of file-based geodatabases, and GIS tool development.