摘要:
A photogrammetric measurement system produces a survey map based on a set of photographed pictures obtained at two different photographing positions. Each of the pictures includes at least one continuous line and at least three conspicuous points away from the continuous line, with at least one of the conspicuous points and remaining conspicuous points being placed at opposing sides of the continuous line. The set of pictures are produced as a first picture and a second picture. First lines are produced between the conspicuous points on the first picture such that the lines intersect the continuous line, thereby generating intersecting points. Second lines are produced between the conspicuous points on the second picture such that the lines intersect the continuous line, thereby generating further intersecting points. A set of corresponding intersecting points are designated on the first and second pictures, and intersecting points are produced on the survey map based on the designated corresponding intersecting points. A line, connecting the intersecting points, is thus produced on the survey map.
摘要:
A target, which is photographed with an object at a spot for a photogrammtric analytical measurement, comprises first, second, third standard point members and assistant point members. The standard point members and the assistant point members are covered by a reflecting sheet. A distance between the first and second standard point members equals a distance between the second and third standard point members. Two assistant point members are positioned on a first straight line connecting the first and second standard point members. One assistant point member is positioned on a second straight line connecting the second and third standard point members. The distance between the first and second standard point members, the distance between the second and third standard point members, and an angle defined by the first and second straight lines, are predetermined.
摘要:
A three points range of high brightness and a four points range of high brightness in a photographed image are selected. It is checked if an identical end point is shared by the three and four points range selected. It is checked if a center of gravity corresponding to the identical end point, a center of gravity corresponding to another end point of the three points rage opposite to the identical end point, and a center of gravity corresponding to another end point of the four points range opposite to the identical end point, meet a positional relationship between standard points of a target.
摘要:
A camera is used in a photogrammetric analytical measurement, performing photography at each photographing position, and has a relative-position-detecting system for three-dimensionally detecting a relative-positional relationship between different photographing positions. The relative-position-detecting system is associated with a three-dimensional coordinate system, defined in the camera, such that an origin of the three-dimensional coordinate system is situated at a back principal point of the camera, and is constituted so as to detect the relative-positional relationship between the different photographing positions, with respect to the three-dimensional coordinate system.
摘要:
In a photogrammetric analytical measurement system, a survey map is produced on the basis of two respective photographed pictures obtained at two different photographing positions. Each of the pictures includes an object image to be recorded on the survey map, and a standard measurement scale image for producing an accurately scaled object image. Data for producing the survey map is approximately calculated on the basis of two-dimensional position data inputted to the computer by designating the scale image and the object image on the pictures with a cursor, by an operator's manipulation of a mouse. When the results of the approximate calculations are erroneous, it is indicated that the inputting of the two-dimensional position data, by designation of the object image with the cursor, should be repeated.
摘要:
A standard scale used in a photogrammetric measurement system has a polygonal plate having three apexes which are arranged to define a reference plane, where each of the apexes defines a reference point. Another standard scale has a light-guide plate member which has three light-emitting spots for defining reference points. Yet another standard scale has a frame member, and reference-point-forming elements, for defining reference points, arranged on the frame to define a reference plane. A marker used in a photogrammetric measurement system for defining a standard scale has a light-guide plate having a light emitting spot for defining a reference point. Another marker has a polygonal-pyramidal-shaped optical assembly formed from light-guide plates, including a core layer containing fluorescent substances, such that an apex of the optical assembly is defined by an emission of fluorescent radiation therefrom.
摘要:
A standard scale used in a photogrammetric measurement system has a polygonal plate having three apexes which are arranged to define a reference plane, where each of the apexes defines a reference point. Another standard scale has a light-guide plate member which has three light-emitting spots for defining reference points. Yet another standard scale has a frame member, and reference-point-forming elements, for defining reference points, arranged on the frame to define a reference plane. A marker used in a photogrammetric measurement system for defining a standard scale has a light-guide plate having a light emitting spot for defining a reference point. Another marker has a polygonal-pyramidal-shaped optical assembly formed from light-guide plates, including a core layer containing fluorescent substances, such that an apex of the optical assembly is defined by an emission of fluorescent radiation therefrom.
摘要:
A camera is used in a photogrammetric analytical measurement, and has a distance-measuring sensor unit for measuring a vertical distance between the camera and a sloping surface of the ground and a minimum distance between the camera and the sloping surface of the ground when the camera is placed above the sloping surface of the ground. The camera has a memory medium for storing the vertical distance and the minimum distance as vertical distance data and minimum distance data, respectively.
摘要:
A reference position-detecting device for use with a photoelectric, incremental encoder which produces a sinusoidal signal in response to the movement of an index scale relative to a main scale. A pattern comprising bright portions and dark portions alternately arranged is formed on the main scale. A similar pattern is formed on the index scale. The device comprises a random pattern formed at some location of the main scale, a similar random pattern formed at some location of the index scale, optical devices for producing a signal indicative of a reference position, a first pulse generator for producing pulses in response to the signal above, second and third pulse generators for producing two kinds of pulses that are 90.degree. out-of-phase in response to the sinusoidal signal, a direction detector for detecting the direction of the movement of the index scale, an analog switch having non-inverting and inverting inputs, a counter for counting the count pulses from the switch, and a fourth pulse generator for resetting the counter on the leading or trailing edge of each count pulse during the presence of the pulses indicating the reference position.
摘要:
A surveying instrument for measuring a rotation angle in which a rotation angle is measured from a reference direction and is displayed. The reference angle is set by zeroing the displayed angle. The display is zeroed only if a reset button is operated twice within a fixed period.