Map Algebra
From now on we will assume all grids have been resampled if necessary to the same cell size and mesh. By "mesh" we mean simply the set of coordinates of cell boundaries.
Map Algebra
ArcGIS Spatial Analyst includes advanced map algebra functions for combining multiple maps, performing suitability analyses, assigning weights, and identifying relationships.
Map Algebra
For most grid functions, other than those which simply identify a selected group of cells, operations take the conceptual format of an algebraic expression.
Map Algebra
The premise for this concept follows that since digital data can be assigned a value, mathematical algorithms can manipulate it. For example, (Map #1 + Map #2) / (Map #3 * Map #4).
Map algebra - A suite of arithmetical operations (i.e. addition, subtraction, multiplication and division) and their combinations for manipulating and analyzing raster data.
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This 'map algebra' is similar to traditional algebra where basic operations, such as addition, subtraction and exponentiation, are logically sequenced for specific variables to form equations-however, ...
Figure 7.6 Map algebra
There are three groups of mathematical operators in the Map Calculator: Arithmetic, Boolean, and Relational.
A little Map Algebra
We now have the information we need about slope and accessibility for each location in our study area.
2.5.1 Python Map Algebra in 10.0
3 Python and GDAL
3.1 Installing the GDAL bindings
3.2 Pre-packaged python+GDAL bundles ...
Raster map algebra and aggregation
The r.mapcalc command provides raster map algebra methods. The r.average command aggregates one map based on a second map.
Raster map resampling and interpolation methods ...
* Map algebra(5) may be used to manipulate model data layers. This allows a model layer's cells to be set to a number or some function of another data layerwhich permits the rapid evaluation of management scenarios that would otherwise be monumental ...
In raster data analysis, the overlay of data sets is accomplished through a process known as "local operation on multiple rasters" or "map algebra," through a function that combines the values of each raster's matrix.
GRID A fully integrated grid (cell-based) geoprocessing system for use with ArcInfo. GRID supports a Map Algebra spatial language that allows sophisticated spatial modeling and analysis.
This is often referred to as raster or map algebra. The use of raster data structures allow for sophisticated mathematical modelling processes while vector based systems are often constrained by the capabilities and language of a relational DBMS.
 See also: Map, Model, Analysis, GIS, Information
  
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