| Identifier | D0114PS | ||||||||
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| Alternate names | D-01-14-PS | ||||||||
| Purpose | Make a vegetation map of eelgrass in the Nisqually Delta | ||||||||
| Description | United States Geological Survey, Pacific Science Center,Washington State Department of Ecology. Chief Scientist: Renee Takesue. Geophysical data of planned field activity D-01-14-PS in Nisqually River Delta, South Puget Sound, Washington, Puget Sound, WA from 02/22/2014 to 02/26/2014 | ||||||||
| Location | WA | ||||||||
| Summary | none yet | ||||||||
| Info derived | Spatial distribution of eelgrass in the Nisqually Delta | ||||||||
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| Vehicles | None |
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| Activity | Geophysical |
| Organization |
2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
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| Principal investigators | Renee K Takesue | ||
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| Data category: | Imagery, Location-Elevation, Sampling, Sonar |
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| Data type: | Video, Navigation, Geology, Single Beam |
| Equipment | Usage description | Data types | Datasets |
|---|---|---|---|
| Camera-video | Photo, Video | 1 | |
| Biosonics 420kHz | Single Beam | 1 | |
| navigation | Navigation | (no data reported) | |
| grab | Geology | (no data reported) |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| Eelgrass distributions derived from a towed underwater video survey of the Nisqually River delta, 2014 | Camera-video | This portion of the USGS data release presents eelgrass distributions derived from towed underwater video surveys of the Nisqually River delta, Washington in 2014 (USGS Field Activity Number D-01-14-PS). Eelgrass data were collected from the R/V George Davidson equipped with a towed underwater video system and global navigation satellite system (GNSS) receiver. The underwater video system consisted of a Splashcam standard definition video camera connected to a Sony GV-D1000 video monitor and tape recorder. Positioning of the survey vessel was determined at 0.5 Hz intervals using a Garmin 76c GNSS receiver. The positioning data from the GNSS were encoded onto the audio track of the digital video recording using Red Hen Systems (RHS) VMS200 hardware. Underwater video data were recorded as the vessel navigated along a series of shore-perpendicular transects at speeds between 1 and 2 knots. The underwater video recording was later reviewed and the presence or absence of eelgrass was determined for each 2-s segment of video tape. These data were used to evaluate the classification of single-beam sonar data acquired during the same time period. | Andrew Stevens |
| Eelgrass distributions and bathymetry derived from an acoustic survey of the Nisqually River delta, Washington, 2014 | Biosonics 420kHz | This portion of the USGS data release presents eelgrass distribution and bathymetry data derived from acoustic surveys of the Nisqually River delta, Washington in 2014 (USGS Field Activity Number D-01-14-PS). Eelgrass and bathymetry data were collected from the R/V George Davidson equipped with a single-beam sonar system and global navigation satellite system (GNSS) receiver. The sonar system consisted of a Biosonics DT-X single-beam echosounder and 420 kHz transducer with a 6-degree beam angle. | Andrew Stevens |
