Glossary
Scale
Scanner
Device to convert from analog maps or photographs to digital image data in raster format.
Shade
Reduction of reflection from the illuminated light due to the effect of the terrain relief. The shade is normally calculated as cosine of the angle between the illuminated light and the normal vector of the terrain surface, on the assumption of an ideal diffuse reflection surface (or Lambertian surface).
Slope
Ratio or gradient of vertical change over horizontal distance.
It is represented by ratio, degree, denominator, percentage or tangent of angle.
Spatial Analysis
An analysis of the spatial relations between spatial objects and the attributes.
It includes operations of query, reclassification, topology rebuilding, overlay and connectivity analysis.
Spatial Filtering
Conversion of the original image quality using various filters in order to restore, correct and enhance imagery and to extract features.
String
Sequence of multiple lines connected to each other represented by series of point coordinates.
Surface Fitting
Generation of a fitted surface or a group of fitted local surfaces to represent the height of given measurements.