05986604 is referenced by 29 patents and cites 2 patents.

A system for selecting an optimal transformation T(G2;G1) between a first ellipsoid E1 (e.g., WGS 84) in a first global coordinate system G1, relative to which the survey measurements are made, and a second ellipsoid E2 (e.g., NAD 27) in a second global coordinate system G2. Location coordinates (x'.sub.m,2,y'.sub.m,2,z'.sub.m,2) for M previously-surveyed locations, numbered m=1, . . . , M (M>1) in the second system, and location coordinates (x'.sub.n,1,y'.sub.n,1,z'.sub.n,1) for N presently-surveyed locations, numbered n=1, . . . , N (M<N), in the first system are provided, where M presently-surveyed locations coincide with the M previously-surveyed locations. The transformation is chose.sub.n so that the images of previously-surveyed locations in the first system under the transformation T are as close as possible to the corresponding [previously-surveyed] locations in the second system. Give.sub.n an ellipsoid and a selected survey plane .tau.0 that is tangent to the ellipsoid, a set of selected locations can be surveyed with reference to the ellipsoid, and the location coordinates of each such surveyed location can be mapped into a corresponding "survey location," defined by reference to a local coordinate system that uses the survey plane .tau.0 as its base. These transformations and projections are determined and optimized in real time, at the time a surveyor is measuring the presently-surveyed locations in the field. The instruments used for surveying may be part of a location determination system, such as GPS, GLONASS or Loran.

Title
Survey coordinate transformation optimization
Application Number
476844
Publication Number
5986604
Application Date
March 21, 1997
Publication Date
November 16, 1999
Inventor
John F Schipper
Palo Alto
CA, US
Richard Jackson
San Francisco
CA, US
Arthur Taylor
Basingstroke
GB
Ian Viney
Christchurch
NZ
Kenneth W McBride
Los Altos
CA, US
Mark Nichols
Sunnyvale
CA, US
Agent
John F Schipper
Assignee
Trimble Navigation
CA, US
IPC
G06F 7/38
G01S 5/02
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