Convert spatial units of measurement (such as arc-seconds to degrees)
Resample data (nearest-neighbor, bilinear, cubic convolution)
Use the Map Calculator to manipulate grids ...
Tile - the spatial unit by which geographic data is organized, subdivided, and stored in a map library. Tiles subdivide the area covered by a map library and organize the library data by location (e.g.
BSU: Basic Spatial Unit
C
CAD: Computer Aided Design, Dispatch, or Drafting ...
To describe the values on L spatial units of M computed variables in N time periods requires in concept a 3-D data structure but this can be reduced to a set of 2-D data structures in the following manner.
Whereas continuously logged data is analogous to a "census" of spatial units, point sampling derives a statistical estimate for each spatial unit based on a set of dispersed measurements.
The spatial lag is nothing but a summary of the effects of the neighboring spatial units. That summary is obtained by means of a spatial weights matrix, which can take various forms, but a very commonly used is the contiguity matrix.
Contiguity measures evaluate the characteristics of spatial units that are connected. These units share one or more characteristics with adjacent units and form a group. The term UNBROKEN is the key concept.
Spatial analysis and modeling often involves aggregate spatial units such as census tracts or traffic analysis zones. These units may reflect data collection and/or modeling convenience rather than homogeneous, cohesive regions in the real world.
Choropleth maps maps, in which each spatial unit is filled with a uniform color or pattern. They are appropriate for data that have been scaled or normalized.
A cell map is generally made up of a spatial grid of rectilinear spatial units (sometimes square) of same size and shape, each depicting a condition assigned to all areas within the cell relative to a selected measurement.
ELECTORAL WARD
The fundamental spatial unit used in the division of voting areas in the UK.
ENTITY
A general term for a real-world thing or digital phenomenon. A house, a road segment, and an ELECTORAL WARD are all examples.
geographical data are often grouped by spatial units such as a census tract, traffic zone, etc.
aggregation can also be by time interval
e.g. number of persons leaving area in 5 years
also by socio-economic grouping ...
Once again, it is important to be explicit about your spatial units on your map and in map text. Whether your aerial units be Parcels, Tracts, Blockgroups or Blocks, you should show their boundaries and be clear in your legend.
52 measurement framework whose spatial units (derived from a categorical coverage of named objects) serve as control for attribute measurement (e.g. census tabulation). choropleth map p.
 See also: Model, Analysis, Information, GIS, Relation
  
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