Translator Disclaimer
1 June 2011 Delineating Distance Intervals for Ship-based Seabird Surveys
Author Affiliations +
Abstract
A system was developed for the delineation of distance intervals in front of an observer during seabird surveys. Delineation is based on a coordinates system (x.y) with the vanishing point on the horizon being the origin (0:0), within a vertical plane in front of the observer. Coordinates of parallel interval limits can be calculated using y = H x/dp (H = height of the observer's eyes; dp = perpendicular distance between transect centerline and interval limit), and coordinates of radial interval limits using (wp = distance between the observer and the vertical plane in direction of interval limit; dc = observer's distance to the interval limit). The use of the delineation system will help reduce observer-induced variation in seabird at-sea surveys.
François Bolduc and André Desbiens "Delineating Distance Intervals for Ship-based Seabird Surveys," Waterbirds 34(2), (1 June 2011). https://doi.org/10.1675/063.034.0216
Received: 14 September 2010; Accepted: 1 December 2010; Published: 1 June 2011
JOURNAL ARTICLE
5 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top