Horizontal block adjustment

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Abstract
XYBLOC is a Fortran programme to connect independent sections into one uniform system of horizontal co-ordinates with no restrictions on the shape of the block or the number and location of control. Features of the programme include the use of an arbitrary system for numbering points and flexible data input, i.e. sections may be loaded in almost any order. The solution is iterative, based on a least squares treatment of the discrepancies at the points where the sections join, with the output showing the mean values of these points as well as the residuals of transformation. A very simple option is provided to exclude certain data during a second run of the programme on the basis of large residuals during the previous run, allowing the user to edit the data. A source list is available from the author.

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