Terms – Pitney Bowes MapXtreme User Manual
Page 615
Appendix L: Glossary
Terms
MapXtreme v7.1
622
Developer Guide
Terms
Adornment
A MapXtreme map element that consists of either a legend, title, or scalebar.
Affine Transformation
A linear transformation, such as a rotation, scaling or shearing, of a geometric object along with a
shift from that transformation. Used in GIS for transforming maps from one coordinate system to
another.
Anti-aliasing
Smooths the jagged edges of lines, curves, and the edges of filled areas when representing a high-
definition rendition at a lower resolution.
Cartesian
A coordinate system using an x,y scale not tied to any real-world system. Most CAD drawing uses
this method of registering objects (for example, a drawing of a ball-bearing assembly or a floor plan).
If a drawing uses Cartesian coordinates, one corner of the drawing probably has coordinates 0, 0.
Cartesian Coordinates
The conventional representation of geometric objects by x and y values on a plane.
Centroid
Usually the center of a map object. For most map objects, the centroid is located at the middle of the
object (the location halfway between the northern and southern extents and halfway between the
eastern and western extents of the object). In some cases, the centroid is not at the middle point
because there is a restriction that the centroid must be located on the object itself. Thus, in the case
of a crescent-shaped region object, the middle point of the object may actually lie outside the limits
of the region; however, the centroid is always within the limits of the region.
Character Encoding
A method of converting a sequence of bytes into a sequence of characters. See also
and
Unicode Transformation Format-8 (UTF-8)
Class
In an object-oriented language, a class is an object or a set of objects that contain(s) methods for
performing some type of function, similar in meaning to a derived type in procedural languages.
Codespace
See
Convex Hull Buffer
A type of buffer that creates a region object that represents a polygon based on the nodes from the
input object. You can think of the convex hull polygon as an operator that places a rubber band
around all of the points. It consists of the minimum number of points so that all points lie on or inside
the polygon. With convex hull buffers, no interior angle can be greater than 180 degrees.
COM+ Pooling
A Microsoft component service in which objects are pre-loaded and pooled to save resources.