Use of Multispectral Photography in Water Resources Planning and Management in North Carolina,

摘要

A series of multispectral aerial photographic missions were flown over the Chowan River of North Carolina to study and evaluate possible uses of multispectral photography in planning for and management of North Carolina's water resources. Flights were also made over parts of the Cape Fear River and Northeast Cape Fear. The report describes how the technique might be used to trace pollutants associated with turbid water and how water draining from the swamps might be traced in larger water bodies. The technique has potential usefulness for monitoring phytoplankton buildups and can be used even if only limited groundtruth is available. Areas of apparently differing water quality were monitored by the multispectral photography both in the Chowan River and in the Northeast Cape Fear River. A technique was developed by which the difference between the extinction depths of a red quadrant and a white quadrant on a modified Secchi disc can be used with water sampling and analysis to obtain biomass concentrations indirectly. This relationship can be one of the groundtruth measurements used to establish relationships between the reflectance characteristics of a water body and various water quality parameters directly or indirectly.