The above statement calculates the slope for each cell in the indem dataset and creates a raster object called outras to store the results. The operators can be grouped into arithmetic, bitwise, boolean, and relational categories. As map algebra has been integrated in python, all the functionality of python and arcpy and its extensions. Functions are the major element of the map algebra language, and there are over a hundred of them. Map algebra is a simple and powerful algebra with which you can execute all arcgis spatial analyst extension tools, operators, and functions to perform geographic analysis. The cells with value 0 in inraster will be assigned to 1 in outreclass and 3 will be assigned to 10 and 4 to 8 for additional information on using classes in map algebra, see an overview of arcgis spatial analyst extension classes map algebra functions that output features, tables or files. In map algebra, operands can be rasters or numbers. The multi output map algebra tool in geoprocessing and the arcgrid workstation command prompt need the output to be explicitly specified to the left of an equal sign. Java project tutorial make login and register form step by step using netbeans and mysql database duration. Map algebra natural resource ecology and management. Map algebra spatial analyst map algebra is the analysis language for arcgis spatial analyst. To use an operator with a raster, the raster must be a raster object. Back in earlier versions of arcgis desktop there was map algebra for example.
The arcgis online help system provides a listing of all of the functions and a help topic for each. An output raster dataset will result from manipulation of the input. Map algebra is available through the spatial analyst module. Specific information on importing the spatial analyst module to utilize map algebra can be found at importing the spatial analyst module map algebra within python is composed of tools, operators, functions, and classes. Please visit the feedback page to comment or give suggestions on arcgis desktop help. The raster calculator tool allows you to create and execute a map algebra expression that will output a raster.
In map algebra, operators apply a mathematical operation on input rasters and numbers. Map algebra is a simple and powerful algebra with which you can execute all spatial analyst tools, operators, and functions to perform geographic analysis. They require the raster datasets, raster layers, feature datasets, feature layers, coverages, shapefiles, or tables to be identified as input arguments. The operators are overloaded since they exist in both spatial analyst and python. Here is where you can find a description of what the function does, as well as its syntax. Spatial analyst map algebra supports a series of operators. Also, the arcgrid prompt does not support brackets. When building a con or setnull map algebra statement with the single output map algebra tool, use the or eq symbol for the equals condition. The input can be as simple as a single raster dataset, raster. Nowadays, similar functionality in arcgis desktop 10. Chapter 10 map algebra intro to gis and spatial analysis. Dana tomlin tomlin 1990 is credited with defining a framework for the analysis of field data stored as gridded values i. Though gridded data can be stored in a vector format, map algebra is. In many of the examples below, no output name is specified and the input data consists of layers enclosed by brackets.