# Buoy Directional Wave Measurements Using Magnetic Field Components

*Directional wave data can be estimated using the heave, pitch and roll motion of a discus buoy, which are conventionally measured by a pitch-roll sensor. To reduce the size and cost, this...*

A Stochastic Source Spectrum for Engineering Application

*The solution of a point source (double couple) combined with K. Aki/A. S. Papageorgiou's stochastic source model is used to establish the power spectrum at the acceleration...*

Rate of Change Methods in Astronomical Surveying

*A method is described whereby longitude, latitude and azimuth can be obtained by taking sights on the sun at short timed intervals. Both rate of change of altitude with time and rate of...*

An Old Trick Recalled

*Adopting practices that reliably orient land descriptions with respect to a time invariant meridian is seen as a necessity for land surveyors. As land values increase, the importance of...*

Three-Dimensional Forward and Inverse Computations

*A system of equations is derived using the three-dimensional methods of vector and tensor analysis, and a computational routine is outlined, which can be used to compute the length, forward...*

Solar Astronavigation in High Latitudes

*Navigator–surveyors with traversing expeditions in the Arctic or Antarctic have two basic methods of astronavigation available to them: zenith angle observations or azimuth angle observations....*

Evaluation of Antarctic Star Observations

*The use of daylight star observations to provide latitude, longitude and azimuth on an Antarctic ice cap is described and evaluated. The field procedures employed are presented and the...*

Computer Program for Horizontal Circle Astronomy

*Any astronomical observation taken on the horizontal circle of a theodolite may be represented by an equation in three unknowns, latitude, longitude, and azimuth. In practice, observations...*

Position by the Azimuth-Zenith Distance Method

*A method of observing both azimuth and altitude (zenith distance) of a star simultaneously has been avoided in the past for second-order position determinations because of the mathematical...*

Double Summation of Errors in Aerial Triangulation

*Data from a 100-model grid triangulation are used to demonstrate certain features associated with the double summation of errors in the transfer of scale, azimuth, and longitudinal tilt...*

Daylight Star Observations in Antarctica

*Field surveys to obtain control for topographic mapping in Antarctica are executed during the continuous daylight of the austral summer. In general, control data have been obtained by...*

Solar-Altitude Azimuths

*A quantitative study of the systematic and accidental errors that affect solar-altitude azimuths shows that the precision of azimuths can be increased materially by taking into account...*

Photogrammetric Determination of Azimuths

*Precise azimuth determination to ±1.0 sec of arc over distances of 70 nm to 300 nm is very desirable where electronic survey techniques, such as HIRAN, are used. In January 1962 a series...*

Surveys for Spacecraft Tracking Sites

*Special application of celestial surveying and surveying mathematics; mapping may be accomplished by establishing equation in spherical coordinates based on trajectory criteria; in evaluation...*

Determination of Position and Azimuth by Simple and Accurate Methods

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Determination of Position and Azimuth by Simple and Accurate Methods

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Technical Procedure for City Surveys

Technical Procedure for City Surveys covers a broad range of topics relevant to city surveys, such as the land itself and the boundaries of...

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