Method and apparatus of computer aided surveying for obtaining digital, 3D topographic information
First Claim
1. A method of surveying for a compilation of detailed three-dimensional topographic data which consists of co-ordinates of a plurality of detail points on terrain and the corresponding topographic points on terrain and the corresponding topographic point codes comprising the steps of(a) scanning photographically or electronically from each of three successive station positions on the terrain surrounding said each station position to obtain a panoramic recording of the terrain but without determining the position of co-ordinates of the station positions, said panoramic recording subtending 360 degrees of the horizon and extending from a zenith above said each station through an angle in a vertical plane of at least 110 degrees, and a distance between two successive stations being such that each detail point occurs on at least two successive panoramic readings to obtain a sequence of recordings,(b) measuring on said panoramic recording an angle between a first line extending between the center of the recording and a detailed point to be defined and a second randomly selected fixed line extending through the center of the recording,(c) measuring on said panoramic recording a distance (r) between the center of the recording and said detail point, said distance (r) being a measure of the angle between a line extend to the station at the center of the recording and said detail point and horizontal plane through said station to determine an elevation of said detail point above the horizontal plane.
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Accused Products
Abstract
Method of surveying for the compilation of digital files of detailed, three-dimensional, topographic data, consisting of co-ordinates of points in the terrain and the corresponding topographic point codes, line codes and plane codes 1. From at least three successive station positions, either photographically or electronically panoramic recordings are made of the terrain surrounding each station position. Each recording contains the entire horizon, from the zenith to far under the horizon, so that a sequence of recordings are obtained. Compared to the local horizon-plane, the spatial directions are determined of points in the terrain to-be-defined using measurement means and calculation means, which allow the determination with high precision, of the distance between the center of the recording and points to-be-defined in co-ordinates and of the direction of the line between the center of the recording and the point to-be-defined in relation to a fixed orientation taken at random in that recording. Special measuring instruments are used.
86 Citations
7 Claims
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1. A method of surveying for a compilation of detailed three-dimensional topographic data which consists of co-ordinates of a plurality of detail points on terrain and the corresponding topographic points on terrain and the corresponding topographic point codes comprising the steps of
(a) scanning photographically or electronically from each of three successive station positions on the terrain surrounding said each station position to obtain a panoramic recording of the terrain but without determining the position of co-ordinates of the station positions, said panoramic recording subtending 360 degrees of the horizon and extending from a zenith above said each station through an angle in a vertical plane of at least 110 degrees, and a distance between two successive stations being such that each detail point occurs on at least two successive panoramic readings to obtain a sequence of recordings, (b) measuring on said panoramic recording an angle between a first line extending between the center of the recording and a detailed point to be defined and a second randomly selected fixed line extending through the center of the recording, (c) measuring on said panoramic recording a distance (r) between the center of the recording and said detail point, said distance (r) being a measure of the angle between a line extend to the station at the center of the recording and said detail point and horizontal plane through said station to determine an elevation of said detail point above the horizontal plane.
Specification