A Geospatial Analysis of Barrier Island Habitat Changes Using Remote Sensing Imagery and LiDAR Elevation Data
Academic Article
Overview
Overview
Abstract
Barrier islands are dominated by several dynamic processes that determine their size, shape and structure. In an earlier study it was found that there was an 18 percent decrease in the area of marsh adjacent to a developed/urbanized barrier island in southeastern North Carolina. This project investigated marsh habitat changes at an undeveloped barrier island. Several topographic and habitat characteristics were studied to identify 1) the relationship between island topography and marsh extent, 2) spatial accuracy of new satellite imagery products for mapping barrier island habitats, and 3) the spatial changes in habitat types. The study area is located on a protected, undeveloped, barrier island that has a variety of topographic characteristics and little beach renourishment. Several initial findings are: 1) some places have a negative relationship between back barrier marsh extent and topographic height where there is generally more marsh where there are lower dunes, 2) some areas of the island have larger overwash fans and this has resulted in large marsh areas, 3) LiDAR elevation data is accurate and useful for measuring small topographic changes, 4) IKONOS and other types of imagery provide additional spectral capabilities compared with orthophotography, and 5) the integration of elevation data and remotely sensed imagery provides improved habitat classification. Currently studies are being conducted to investigate the relationship between boat traffic and marsh edge erosion and an assessment of marsh density. Results from this research are being used by coastal managers to help with developing guidelines for recreational and economic use of the coastal environment.
