Pitney Bowes MapXtreme - Manual (Page 616)

Appendix L: Glossary
Terms
MapXtreme v7.1 623 Developer Guide
Coordinate
An x,y location in a Cartesian coordinate system, or a Latitude, Longitude location in an earth
coordinate system. Coordinates represent locations on a map relative to other locations. Earth
coordinate systems may use the equator and the Greenwich prime meridian as fixed reference
points. Plane coordinate systems describe a two-dimensional x,y location in terms of distance from a
fixed reference and are usually in the first quadrant so that all coordinates are positive numbers.
Coordinate System
A coordinate system is used to create a numerical representation of geometric objects. Each point in
a geometric object is represented by a pair of numbers. Those numbers are the coordinates for that
point. In cartography, coordinate systems are closely related to projections. You create a coordinate
system by supplying specific values for the parameters of a projection.
Data Provider
A bridge between an application and a data source, which provides mechanisms for accessing data
for use in the application.
Data Binding
The association of a data source with a server control. The MapXtreme DataBinding class contains
information about a single data-binding expression in an ASP.NET server control, which allows
rapid-application development (RAD) designers in Visual Studio to create data-binding expressions
at design time.
Decimal Degree
The decimal representation of fractions of degrees. Many paper maps express coordinates in
degrees, minutes, seconds (for example, 40_30i10I), where minutes and seconds are fractions of
degrees. Thirty minutes equal half a degree, and 30 seconds equal half a minute. MapXtreme
expresses coordinates in decimal degrees (e.g., 72.558 degrees). Thus, the longitude: 40 degrees,
30 minutes, would be expressed in MapXtreme as 40.5 degrees.
Degrees Longitude, Degrees Latitude, Decimal Degrees
Degrees longitude and degrees latitude are coordinates used to represent locations on the surface
of the earth. Longitude, or X-coordinate, represents a location's east-west position, where any
location west of the prime meridian has a negative X value. Latitude, or Y-coordinate, represents a
location's north-south position, where any location south of the equator has a negative Y value.
Derived Class
A class that contains all of the features of its base class but contains either additional functionality or
enhanced functionality with respect to its base.
Enumerate
A type that contains all of the variables and their possible values.
Event Handler
An attribute for an object on a page that can be written in either JavaScript or VBScript. For
example, an event handler describes what to do when a user clicks a button or selects text in a list
box. Both VBScript and JavaScript support explicitly defined event handlers, for example, on Click
and on Select. In addition, you can define functions that replace the explicit event handlers. Such
functions are called implicit event handlers.