Changes

In addition to algorithms for gridding, contouring, and [[cross section]] display, there are many other tools required for effective computer mapping. Whether a grid, triangulated mesh, or other surface model is used, most of these tools are needed. Where appropriate, the term ''surface model'' is used instead of grid to make the descriptions more general. Here is a list of some of those tools:

In addition to algorithms for gridding, contouring, and [[cross section]] display, there are many other tools required for effective computer mapping. Whether a grid, triangulated mesh, or other surface model is used, most of these tools are needed. Where appropriate, the term ''surface model'' is used instead of grid to make the descriptions more general. Here is a list of some of those tools:

* Single data and surface operations—Add, subtract, multiply, and divide by a constant, trigonometric functions, blank max, blank min, clip max, clip min, normalize, dip and azimuth, statistics, rotate, and so on.

* Single data and surface operations—Add, subtract, multiply, and divide by a constant, trigonometric functions, blank max, blank min, clip max, clip min, normalize, dip and [[azimuth]], statistics, rotate, and so on.

* Dual data and surface operations—Add, subtract, multiply, divide, union, intersection, max, min, blank max, blank min, clip max, clip min, and so on.

* Dual data and surface operations—Add, subtract, multiply, divide, union, intersection, max, min, blank max, blank min, clip max, clip min, and so on.

* Polygon blanking—One or more polygons are used to blank or set to another value data or surface values inside or outside the polygons.

* Polygon blanking—One or more polygons are used to blank or set to another value data or surface values inside or outside the polygons.