Benthic Mapping in Long Island Sound

QTCView is used with an incorporated depthfinder to create a sonar map of the bottom to the west of the Charles Island, in Long Island Sound in Connecticut waters. Two maps are created, one at 50 kHz and one at 200 kHz to compare the results. Video is being used to groundtruth the bottom type classifications identified by the sonar.

To compare the two maps to see if different frequencies result in different classifications.

Data is not accessible at current time as it is still being edited

Data is not accessible at current time as it is still being edited

NEFSC Data Access Procedure:

1. Formal request in writing usually to the data owner/contact or Center Director;

2. Requester is contacted by data owner to review and verify the request content and details for data delivery options.

3. If data is confidential then owner will determine if the data may be released to the requester;

4. If data can be released, the data is downloaded and packaged for delivery electronically; or the requester may be directed to where the data is available online.

Data is not accessible at current time as it is still being edited

NEFSC Data Access Constraints:

If data is stored on an internal NEFSC network, the requester may not have direct access to query the data unless they are also authorized for network access.

Excel on server, video on DVDs

Sonar data contains water depth as a variable. Data was collected on different days at different stages of the tide. Since there is a 6 foot tidal range in Connecticut, this causes artifacts in the data which mask the true topography. Data has not been corrected to some standard stage of tide.

Unknown because data is still in process of being edited

Sonar echoes are examined individually and poor ones (out of range, multipath errors) are removed.

Data is stored on our network server which is backed up daily, Remote backups.

Using QTC View and depth finder and video to groundtruth the sonar returns and create habitat map of bottom