Abridged Molodensky transform

The standard way to convert coordinates from one datum to another is to first convert the coordinates to geocentric coordinates, then apply the datum shift and rotation parameters, then convert them back to geographic coordinates. As an alternative to this transform, the Molodensky formula implements directly a transform that is quite satisfactory for three parameter transformations.

affine transform

Affine transforms are commonly used in coordinate transformation. An affine transform is simply defined by a 4x4 double values matrix, and are applied to coordinates by multiplying them as if they were one 1x4 matrix.

AJAX

Asynchronous JavaScript and XML is a web development technique for creating interactive web applications. AJAX makes web pages more responsive by exchanging small amounts of data with the server behind the scenes, so that the entire web page does not have to be reloaded each time it is changed. This increases the web page's interactivity, speed, and usability.

APP-6a

APP-6a is the NATO standard for military map marking symbols. The previous version is APP-6 (1986). APP-6a was adopted in 2001. The NATO standardization agreement describing APP-6a is STANAG 2019. In the United States the equivalent Standard is MIL-STD-2525B.