Parent Layer: Eelgrass

Name: 2019

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Description: The dataset shows the locations where eelgrass was observed in the Great Bay Estuary based on photointerpretation of orthophotography collected on August 2, 2019. The study area includes the following waterbodies: Great Bay, the mouth of the Squamscott River, the tidal portion of the Lamprey River, the tidal portion of the Oyster River, the tidal portion of the Bellamy River, the Piscataqua River and Portsmouth Harbor and its associated creeks. Vertical aerial photography was collected as digital 4-band imagery with a nominal 1 foot resolution using an Zeiss DMC IIe 230 Mapping Camera. Environmental conditions included a low-sun angle, low spring tide, low cloud cover, calm winds, no preceding rain events, and low turbidity in the water column. The eelgrass habitat mapped from the aerial imagery was verified using the ground truthing data from preselected locations and ad hoc locations chosen during the course of the field work. Ground truthing was done from a small boat during the same season as the photographs were taken. Ground truth observations were made on all tides using a drop camera with video recording capabilities and at low tide when visual observations were recorded. Positions were determined using high accuracy Trimble GeoXT GPS unit.

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