November 1998 data collected by the USGS survey 98015 aboard the Canadian Coast Guard vessel Frederick G. Creed. This set is a sun-illuminated topographic image of the sea floor offshore eastern Cape Cod, Massachusetts, created from multibeam sonar data. The image has a 4-meter pixel size and was reprojected into the Massachusetts State Plane coordinate system in September 2006.
Use Cases
- Visualizing sea floor topography based on sun-illuminated shaded relief imagery
- Analyzing small-scale sea floor features based on enhanced relief of a few meters
- Identifying artifacts of data collection based on unnatural patterns parallel or perpendicular to survey tracklines
- Mapping bathymetric striping effects based on poor data return at nadir and critical angle effects
Strengths
- Data collected with a Simrad EM 1000 multibeam echo sounder utilizing 60 electronically aimed beams
- Image has a 4-meter pixel size and accentuates small features with relief of a few meters
- Vertical resolution of the sonar data is approximately 1 percent of the water depth
Limitations
- Description metadata is limited; actual data quality requires manual inspection after download
- Last updated 1998-11-25 23:59:59.999000; freshness should be verified
- Data contains artifacts such as striping parallel to ship tracks and unnatural patterns
Provenance
- Source
- USGS survey 98015, SCIOPS
- Collection Method
- Multibeam sea floor mapping system aboard the Canadian Coast Guard vessel Frederick G. Creed
- Time Range
- November 9 - 25, 1998
- Freshness
- 1998-11-25 23:59:59.999000
- Geography
- Sea floor offshore of eastern Cape Cod, Massachusetts