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Anderson Creek Wetlands Mapping Description 
The U.S. Army Corps of Engineers is in the midst of restoring wetlands along the Hackensack River in New Jersey to a more natural state. Bowne was contracted to map 98 acres of marshland adjoining the Hackensack River in Secaucus, New Jersey and to seamlessly integrate hydrographic surveying of the adjacent river with the intention of creating a unified digital terrain model (DTM). The Corps of Engineers will use the DTM Bowne created to determine the earth work volumes needed to return the marsh to a more natural environment and restore native wetland plant species.
Bowne established ground control. Targets were laid out and located as directed by the photogrammetrist. Base mapping was developed for the site. National Geodetic Survey benchmarks were recovered in the project area to establish the project datum. Real time kinematic GPS was used to locate the aerial targets. Ties to the National Spatial Reference System were made using NGS’ On Line Positioning User System (OPUS). The Corps of Engineers elevation specifications could not be met using aerial mapping methods alone. Bowne fielded three field crews using Total Stations to grid the marshland with a 50-foot by 50-foot grid. Additional elevations were measured at specified stream cross sections along the tidal streams in the marsh. A small boat was used to gather stream cross section data. Location and identification of specific types of marsh grasses were also required, to help determine the environmental health of the marsh. Soundings from the Hackensack River were integrated with the grid from the topographic survey. Using both the grid elevations and the soundings in the Hackensack River, an InRoads compatible DTM was created. Drafting was completed in both AutoCAD and MicroStation using Corps of Engineers CADD standards. Bowne Services
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