Criteria for the Classification of Hydrographic Positioning Data.
Abstract
Two methods for evaluating the accuracy of hydrographic positioning data are presented. One method consists of classifying each position in a survey based on the radius of the 90 percent confidence circle. The second method involves classification of positions based on the parameters of the 90 percent confidence ellipse. Both methods are based on geometric and statistical relationships between intersecting lines of position. Range-range, azimuth-azimuth, and range-azimuth positioning data are classified using both criteria. For noncritical positions, the confidence circle method is found to be preferable due to its ease of interpretation. For positions of significant features, such as underwater hazards, the confidence ellipse provides a more useful representation of the shape and orientation of the true error distribution. The concept of presurvey positioning design is also presented. With the aid of computer graphic displays, the hydrographer can predict the accuracy of offshore positioning data prior to data acquisition. By analyzing accuracy lobes generated about shore stations, a survey can be designed to meet given specifications. Originator-supplied keywords: Hydrography, Hydrographic surveying, Confidence ellipse, Confidence circle repeatability, Hydrographic positioning.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1984
- Accession Number
- ADA152283
Entities
People
- N. E. Perugini
Organizations
- Naval Postgraduate School