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Description: This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). The National Wetlands Inventory - Version 2, Surface Waters and Wetlands Inventory was derived by retaining the wetland and deepwater polygons that compose the NWI digital wetlands spatial data layer and reintroducing any linear wetland or surface water features that were orphaned from the original NWI hard copy maps by converting them to narrow polygonal features. Additionally, the data are supplemented with hydrography data, buffered to become polygonal features, as a secondary source for any single-line stream features not mapped by the NWI and to complete segmented connections. Wetland mapping conducted in WA, OR, CA, NV and ID after 2012 and most other projects mapped after 2015 were mapped to include all surface water features and are not derived data. The linear hydrography dataset used to derive Version 2 was the U.S. Geological Survey's National Hydrography Dataset (NHD). Specific information on the NHD version used to derive Version 2 and where Version 2 was mapped can be found in the 'comments' field of the Wetlands_Project_Metadata feature class. Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands_Project_Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.
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Description: The NH Department of Environmental Services (DES) has compiled geographic information on the boundaries of shellfish beds in NH’s tidal waters mapped within the last 10 years. Softshell clams, oysters, blue mussels, surf clams and razor clams have been documented. The coverage contains the boundaries of what is considered by DES to be current shellfish beds in NH. The coverage is updated periodically as new data becomes available. The purpose of this coverage is to compile all existing information about the extent of shellfish resources in NH’s tidal waters mapped within the last 10 years. The coverage will be used by DES for shellfish indicator reports and shellfish growing area classifications.
Service Item Id: 8d5f15cb82794d338f9bb211b1e94144
Copyright Text: The NH Department of Environmental Services (DES)
Value: American Oyster, Soft Shell Clam, Hard Clam, European Oyster Label: American Oyster, Soft Shell Clam, Hard Clam, European Oyster Description: N/A Symbol:
Value: American Oyster, Soft Shell Clam, Hard Clam, Razor Clam, Blue Mussels Label: American Oyster, Soft Shell Clam, Hard Clam, Razor Clam, Blue Mussels Description: N/A Symbol:
Value: American Oyster, Soft-Shell Clam, Hard Clam, Sea Scallop, Great Scallop, Bay Scallop, Green Sea Urchin Label: American Oyster, Soft-Shell Clam, Hard Clam, Sea Scallop, Great Scallop, Bay Scallop, Green Sea Urchin Description: N/A Symbol:
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.
Description: The dataset shows the locations where eelgrass was observed during the 2022 field season within the following water bodies: 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, and the coastal shore of Odiorne Point. Photointerpretation was completed on orthophotography collected using a UAV over the study area. Sentinel satellite imagery was also used to further complement these datasets to help with photointerpretation. GoPro camera aerial imagery was also taken from a small plane over the whole of the study to further complement the photointerpretation of the imagery. UAV imagery was collected as five spectral bands inclusive of RGB, Red-Edge ,and Near Infrared bands. Imagery was collected with varying 1.7 to 3.4 cm spatial resolutions based on 100 to 400 ft flight altitudes specific to FAA maximum flight restrictions around the Pease International Tradeport. The Sentinel satellite imagery was acquired for the date of August 2nd, 2022 with a nominal 10-meter spatial resolution. The GoPro imagery captured non-rectified true-color photographs. Environmental conditions including low-sun angles, low tides, low cloud cover, calm winds, no preceding rain events, and low turbidity in the water column, were maintained throughout the course of the UAV survey when possible. The eelgrass habitat mapped from the 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.
Description: The dataset shows the locations where eelgrass was observed within 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, and the coastal shore of Odiorne Point. Photointerpretation was completed on orthophotography collected via UAV, as well as Go-Pro imagery from fixed wing aircraft and Sentinel satellite imagery. Vertical UAV imagery was collected as five spectral bands inclusive of RGB, Red-Edge ,and Near Infrared bands. Imagery was collected with varying 1.7 to 3.4 cm spatial resolutions based on 100 to 400 ft flight altitudes specific to FAA maximum flight restrictions around the Pease International Tradeport. Areal Go-Pro RGB vertical aerial imagery was collected on August 23rd, 20024. The Sentinel satellite imagery was acquired for the date of August 8th, 2024 with a nominal 10 meter spatial resolution. Environmental conditions included a low-sun angle, low tides, low cloud cover, calm winds, no preceding rain events, and low turbidity in the water column were maintained throughout the course of the survey. 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 a high accuracy GPS unit.Database file attributes for the 2024 survey are as follows: “id,” a unique consecutive number; “Hectares,” the area of the polygon in hectares; “Acres,” the area of the polygon in acres; “Year,” equal to 2024, the year of the imagery used, “Label” for the assessment zone, and “type” to distinguish between polygons mapped as at least 10% eelgrass (type = 1), at least 10% widgeon grass (type = 3), or at least 10% eelgrass and at least 10% widgeon grass (type = 2), “Confidence,” a measure of cartographer confidence (H = Higher, M = Medium, L = Lower) of the existence and/or cover type of vegetation per polygon. “Notes,” a text field listing the types of imagery used and/or mapping limitations per polygon as observed by the cartographer. Note that sparse eelgrass areas with < 10% cover (type =0) are also recorded within the "Type" field (attribute), but do not meet the >= 10% cover threshold to be counted towards eelgrass totals within the study.