Abstract
Data (Z) which are a function of two independent variables (e.g. x and y) may be presented in the form of “contour plots”. Most readily available and inexpensive contouring programs require an orthogonal grid with uniform grid cell size. This paper reviews a simple algorithm that increases the versatility of conventional contour programs by permitting the use of grids in which Δx and Δy can differ with x and y respectively. Contours obtained in this manner should be used with care if slopes or trends are to be calculated. This algorithm has applications for data presentation in several specialized fields, including geophysics and oceanography.
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