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Considerations for the Design of a Projection Plotter 763 HOW ACCURATE lS AERlAL SURVEY? 761 survey where the amount of levelling required areas where the cost of aerial photography is to control the photogrammetric survey is al­ disproportionately high to the size of the job. most equal to that required to provide a grid The undisputed field of the ground surveyor of spot levels dense enough to permit the in­ must lie however in practically all work which terpolation of contours by eye. involves setting out, including the running of (3) Again ground survey is essential for lines of precise engineering levels. small-scale mapping of dense areas of forest (6) As regards the reference to t inch ac­ or bush where trails, drainage, and even small curacy becoming "meaningless" this does villages may often be screened entirely from not, of course, refer to the many cases where the aerial view and can only be supplied by levels are referred to precise ground marks, running a traverse on the ground. but to level information read off a plan and (4) As the scale of the plan becomes large of which the accuracy is dependent on the so the work of the ground surveyor becomes scale of the plan. For instance, the nearest increasingly important. At very large scales, one can re-establish a given point on the say in excess of 30 ft. to the inch, it is usually ground from measurements taken on a advisable to do the whole survey on the 1/2,500 plan is ±3-4 feet. Within this circle ground, for the sake of both accuracy and of location on uneven or sloping ground it is economy. possible for the level to vary by an amount (5) Ground survey is also preferred for the far in excess of the precision with which it is preparation of large-scale plans of very small surveyed and its value marked on the plan. Considerations tor the Design of a Projection Plotter* J. A. EDEN, Directorate of Overseas Surveys, Kingston Bye-Pass, Tolworth, Surbiton, Surrey, England HE advantage of the projection plotter with regard to model clarity and definition, T compared with the more complicated and obviates the necessity for spectacles. binocular instruments is its extreme simplic- (2) The instrument should he nominally ity. distortion free and utilise full size 9/fX9/f dia- Having examined a number of projection positives. Optimum projection should be be- plotters of different makes, I am convinced tween X 5 and X 6. The working table should that a cheap projection plotter could be built be large enough to accommonate the whole of for plotting individual models with better a X 6 projection. Allowing margins at front performance and facilities than any existing and back to accommodate the tracing table projection plotters and with a working ac- supports when working close to the model curacy as good, if not better than any existing edge, the table width would need to be 62 first-order plotter, except of course, the in- inches. This is not too large to be convenient- strument would not measure machine coordi- Iy worked from both sines. nates or be convenient for air triangulation. (3) The projectors should be mounted so The design should feature the following that the diapositives are held in an approxi- points: mately vertical plane, and prisms should be (1) Rotating shutter viewing should be provided in front of each lens to reflect the employed. Compared with anaglyph viewing projections down vertically onto the horizon- this system presents enormous advantages tal working table. The advantage of this * This paper was included in The Photogrammetric Record (Vol. llI. o. 13. April 1959) published by the Photogrammetric Society. London, England. Permission to reprint in PHOTOGRAMMETRIC ENGI­ NEERING was requested provided credit be given to the JOURNAL, the Society and the author. This per­ mission was given. This publication extends thanks and gives credit as above stated-ED. 762 PHOTOGRAMMETRIC ENGINEERING would be to obtain a model without mirror re­ to move both projectors towards or away versal. In all existing instruments this is only from a central point, or alternatively only to achieved by one of the following methods, move one projector. Controls for all these ad­ each of which tends to introduce errors, or justments should be situated so that they can presents special difficul ties: be worked easily by the operator whilst he is (i) By placing the diapositives upside actually inspecting the model in any part of down in the projectors so that the the model area. They should move smoothly glass of the diapositive plant is inter­ and firmly without backlash.* posed between the emulsion and the (7) The working table should be a com­ lens. This calls for an impossibly high pletely rigid block of material which should quality of glass diapositive plate with be machined flat. It should be rigidly sup­ both surfaces flat and of equal thick­ ported on levelling screws which would not ness and without optical blemishes, if be adjusted after initial installation of the in­ errors are to be avoided. strument. (ii) By contact printing with point source (8) The grid model when projected onto light with the thickness of the nega­ the plotting table should be as free as possible tive film interposed between the emul­ from plan and height errors which should not sion surfaces. This reduces resolution exceed 0.10 mm. and 0.17 mm. respectively. by scatter and multiple reflections in This requirement calls for projecting lenses the film thickness. with distortions smaller than 16 microns at (iii) By projection printing with a trans­ negative scale. forming printer which introduces pos­ (9) It is suggested that residual errors of sible errors from the transforming this order might then be removed in the plane printer and involves expenditure on of the projection by raising or lowering the this accessory. tracing table platen. This could be accom­ The above systems would be avoided if the plished in a manner somewhat similar to that method proposed was adopted, and diaposi­ employed in the Kelsh instrument for raising tives could be made by direct contact print­ or lowering the projector lenses except that ing, emulsion to emulsion, preferably in an the correction would be accomplished at the electronic printer. tracing table (instead of at the lens) where the (4) The lamp houses, and their connection errors would be larger and more easily by a rod, or rods, to the tracing table should handled. It is suggested that the correcting be supported by arrangements quite separate arm which would raise or lower the table top from the arrangements for supporting the should be motivated by a feeler bearing on a projectors so there could be no possibility of miniature surface which would be flat in the the movement of the tracing table disturbing absence of distortion but would depart from the projectors. flatness where corrections were desired by (5) The projectors should be supported in amounts equal to the required corrections a rigid frame, avoiding any cantilevering multiplied by an enlarging factor. This factor principle. This frame should be adjustable on would depend on the leverage employed. The three, and not four screws to provide facili­ shape of such a surface would be easy to de­ ties for absolute levelling. These three screws termine by empirical methods, and would not should bear on a second frame of particularly be difficult to manufacture. rigid construction which should bridge firmly (10) The tracing table should be operable between the main supports. Consideration from both front and back of the instrument should be given to the idea of casting the without the necessity for rotating the table or main supports in concrete, and it is suggested disconnecting and re-attaching the lamp that manufacturers might provide shuttering house guide rods. This is already possible on so that customers could cast their own sup­ the \Villiamson and Kelsh instruments and ports. The supporting arrangements of all ex­ the only necessity to rotate the tracing table isting instruments are considered to be noth­ on these instruments seems to be because the ing like rigid enough. heigh t scale can only be read from one side. (6) Each projector should be provided with adjustments for tip, tilt and swing, the former * Mr. Eden has called attention to a minor about the nodes of the projector lenses and error in paragraph 6. Clearly the adjustments for tip the latter about the optical axes. Adjustments and tilt would need to be about the images of the nodes of the projectors and not about the nodes of the projectors in (bz) and (by) are not themselves. He is also now of the opinion that it necessary and should not be provided. A would be necessary to employ mirrors, and not (bx) adjustment should be provided, either prisms, in front of the lenses.-EDIToR CONSIDERATIONS FOR THE DESIGN OF A PROJECTION PLOTTER 763 I t should be easy to arrange for the height tially avoided. It is considered that a resolu­ scale to be readable from both sides. tion performance should be obtainable which (11) The depth of focus should be as large approaches closely that of binocular in­ as possible without very adversely affecting struments provided the instrument is worked the model resolution. This is probably best close to its level of optimum projection. The achieved by employing small apertures and depth of focus provided should thus be used very bright lighting, with, if necessary, silent for accommodating the model relief and not running fans to effect cooling. as a means of changing model scale. (12) Resolution should be as high as pos­ (13) An accessory should be provided as an sible.
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