Earth Imaging Glossary
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" V "
VECTOR
Any quantity which has both magnitude and direction, as opposed to scaler which has only
magnitude.
VECTOR DATA
Vector data, when used in the context of spatial or map information, refers to a format where
all map data is stored as points, lines, and areas rather than as an image or continuous tone
picture. These vector data have location and attribute information associated with them.
VERTICAL POSITIONAL ACCURACY
Vertical positional accuracy is based upon the use of USGS source quadrangles which are
compiled to meet National Map Accuracy Standards (NMAS). NMAS vertical accuracy
requires that at least 90 percent of well defined points tested be within one half contour
interval of the correct value. Comparison to the graphic source is used as control to assess
digital positional accuracy.
VERTICES
Vertices are the intersecting points of lines. Commonly, in GLIS data sets, these points
define either unique locations which represent end points of a line feature, or corners of a
polygon or area feature.
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Initial content for this Glossary of terms has been graciously supplied by RADARSAT International - www.rsi.ca
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