Coastal Zone Mapping
Coastal zone mapping is undertaken to provide an inventory of base data as a foundation for further studies in shoreline change, sea level rise, and habitat, for the development of monitoring programs, and as a basis for management decisions. Mapping in the coastal zone provides significant challenges. Rough, rocky coastlines are hazardous for small survey vessels, and very shallow approaches may be impractical or impossible to map using vessel-mounted multibeam sonars. Airborne lidar may be used to map the coastal terrain and also the bathymetry, if conditions are right. Recently, vessel or vehicle mounted or stationary laser scanners have been used to supplement coastal data sets. If budget and time allow, a combination of multibeam sonar, interferometric sonar, airborne lidar, and laser scanning can provide a complete picture of the coastal zone.
Fledermaus is used throughout the coastal mapping project, from data acquisition through presentation. During data acquisition and quality control stages, data can be quickly loaded and visualized to evaluate the quality of the data and rapidly identify artifacts, in 3D. During processing, the Fledermaus software has direct read and unload to a variety of sensor, software, and agency specific formats including XYZ, LAS, QINSy QPD, GSF, CARIS HIPS & SIPS HDCS, Hypack HS2, and Kongsberg ALL. True 64-bit software, use of multiple processors,CUBEThe CUBE algorithm was developed by Dr. Brian Calder at the Center for Coastal and Ocean Mapping/Joint Hydrographic Center at the University of New Hampshireand Area Based processing methods are utilized to shorten processing time and quickly take your data from unrefined survey data to the best possible seabed, shoreline, and terrain surface model; create separate models at the highest individual resolution or one continuous model.
Additional grids, airphotos, backscatter and sidescan imagery, nautical charts, contours, Electronic Nautical Charts, and other information can be added to support your processing. Once data is refined to a clean point set, Fledermaus has the tools you need to further analyze your data and produce your survey report, open file report, or other products. Bathymetric Attributed Grids (BAG) with proper metadata, survey area polygons, and Sounding Density Surfaces can be generated to show coverage and for quality assurance. Sidescan, multibeam backscatter, and video imagery can be draped on terrain models for assessment of seabed type or site monitoring; sub-bottom information can be added to provide a picture of geophysical and geomorphological processes occurring offshore. Visually compare repeat surveys or use the surface difference tools to get the depth, area, and volume difference between surveys. Using the 4D, time-integrated Fledermaus interface, it is possible to visualize dynamic systems - fluid chemistry, dispersal patterns for pollutants, sea level change, or sediment deposition - changing over time and integrated with other data; these animations can be distributed as MPEG/WMV movies or as interactive scenes that can be opened in iView4D, the free downloadable viewer. Finally, your data may need to be databased, transferred or exported to other programs. Fledermaus provides export to XYZ, GMT GRD, Arc Grid, Floating Point GeoTIFF, or Google Earth KMZ, while Fledermaus’s direct integration toArcGIS® GeodatabasesArcGIS® trademark provided under license from Esricreates a seamless transition from data to archiving, further analysis, and product creation.
For an example of Fledermaus being used for coastal zone mapping, see the Geomatics Data Solutions website. Also see the Channel Coastal Observatory website where UK coastal data can be downloaded in Fledermaus SD format.
Data courtesy of Channel Coastal Observatory & MCA, UK (www.channel.org)