Listing of Glossary
The following is the listing of glossary which maybe useful to you. You may use our search form or click through the letters :
| Accuracy |
closeness of a measurement to a value thought to be true; repeatability can be estimated by repeated measurement, measured by variance for continuous measures; accuracy of classification for categories can be summarized by a misclassification matrix when compared to a survey of greater accuracy. Exploring Geographic Information Systems by Nicholas Chrisman |
| Absolute Measurement |
a level of measurement higher than ratio where the unit of measurement is not an arbitrary decision, so the numbers cannot be rescaled and retain their meaning. Probability is an example of an absolute scale. |
| Attribute |
the range of possible values of a characteristic; an attribute value is a specific instance of the characteristic associated with a geographic feature. |
| Absolute georeference |
The referencing in space of the location of a point using a predefined coordinate system such as a national grid or latitude/longitude. |
| Airphoto |
A 9" x 9" photograph taken vertically downward from the air on 10" roll film. Airphoto images may be in the form of paper prints or transparent film. An airphoto includes significant horizontal displacement introduced by camera characteristics, tilt, nearness to the target scene, and variations in elevation of the target terrain. |
| Aerial photograph |
Photograph taken from an aerial platform (usually an aeroplane), either vertically or obliquely. |
| Aggregation |
The process of combining smaller spatial units, and the data they contain, into larger spatial units by dissolving common boundaries and lumping the data together. |
| Azimuthal projections |
Map projections in which the surface of the globe is projected onto a flat plane. |
| Absolute Orientation |
Scaling,leveling and orientation to ground control of a stereo pair of aerial photographs during the photogrammetric setup process. |
| Acetate Overlays |
A nonflammable plastic sheeting used as a base for photographic fils or as a drafting base for overlays where critical registration is not required. |
