An overview of the Spatial Analyst functions

Disponible avec une licence Spatial Analyst.

Disponible avec une licence Image Analyst.

The Spatial Analyst extension supports many functions in ArcPy for processing and creating rasters or raster objects. They are organized into related groupings in the following categories: Analysis, Appearance, Conversion, Correction, Data Management, Math, Reclassification, Statistical, and Surface.

Many of these functions, available with the arcpy.sa module, do not require a Spatial Analyst license. Where applicable, the license requirements for each function are listed in the function documentation. A number of functions are also available with the arcpy.ia module, and similarly do not require the Image Analyst license. If the function requires a license and you are working with a Concurrent Use license, you can use the CheckOutExtension function to access the functionality.

Analysis

Function	Description
Anomaly	Creates a raster object that contains the anomaly pixel values of the input multidimensional raster based on a time-dimension interval and the anomaly calculation method.
Apply	Creates a raster object by applying a raster function or function chain to one or more input rasters.
Foreach	Creates a raster object by applying a raster function or a customized function template to every slice in the input multidimensional raster.
HeatIndex	Calculates apparent temperature based on ambient temperature and relative humidity. The apparent temperature is often described as how hot it feels to the human body.
TasseledCap	Creates a raster object by applying a tasseled cap transformation on an input raster.
Threshold	Creates a raster object by dividing an input raster into two distinct classes, where a high-value class is displayed with white pixels and a low-value class is displayed with black pixels.
WindChill	Identifies dangerous winter conditions that, depending on exposure times to the elements, can result in frostbite or hypothermia.

Appearance

Function	Description
ContrastBrightness	Creates an enhanced image by improving the contrast and brightness of the source image.
Convolution	Performs filtering on the pixel values in an image, which can be used for sharpening an image, blurring an image, detecting edges within an image, or other kernel-based enhancements.
Pansharpen	Creates a higher-resolution multiband image by fusing a lower-resolution multispectral image and a higher-resolution panchromatic image.
StatisticsHistogram	Computes the statistics and histogram of a raster.
Stretch	Enhances an image by changing properties such as brightness, contrast, and gamma through multiple stretch types based on statistics.
VectorFieldRenderer	Visualize flow direction and magnitude information in your raster with vector symbols.

Conversion

Function	Description
Colormap	Transforms the pixel values to display the raster data as either a grayscale or an RGB color image based on a color scheme or specific colors in a color map file.
ColormapToRGB	Converts a single-band raster with a color map to a three-band (red, green, and blue) raster.
ColorspaceConversion	Converts the color model of a three-band unsigned 8-bit image from either the hue, saturation, and value (HSV) to red, green, and blue (RGB) or vice versa.
Complex	Computes the magnitude from complex values.
Grayscale	Converts a multiband image into a single-band grayscale image. Specified weights are applied to each of the input bands, and a normalization is applied for output.
SpectralConversion	Applies a matrix to a multiband image to affect the color values of the output.
UnitConversion	Converts pixels from one unit to another. It supports conversion of distance, speed, and temperature.
VectorField	Combines and converts two rasters into a two-band raster that is of either data type Magnitude-Direction or data type U-V.

Correction

Function	Description
Speckle	Creates a raster object by removing speckle and smoothing out noise in radar datasets, while retaining edges and sharp features in the image.

Data Management

Function	Description
ApplyEnvironment	Creates a new raster that is a copy of the input raster with the current environment settings being applied.
CompositeBand	Creates a raster object by combining multiple rasters to form a multiband image.
ExtractBand	Creates a raster object by extracting one or more bands from, or reordering the bands in, a multiband raster.
Mask	Creates a raster object by specifying one or more NoData values or a range of valid pixel values.
Resample	Creates a raster object by changing the spatial resolution of the input raster and sets rules for aggregating or interpolating values across the new pixel sizes.
Subset	Creates a raster object that is a subset of the input multidimensional raster based on selected variables and dimension intervals.
TransposeBits	Creates a raster object by unpacking the bits of the input pixel and mapping them to specified bits in the output pixel. The purpose of this function is to manipulate bits from a couple of inputs, such as the Landsat 8 quality band products.

Math

Function	Description
Arithmetic	Performs an arithmetic operation between two rasters or between a raster and a scalar and returns a raster object with the operation applied.
BandArithmetic	Performs an arithmetic operation on the bands of a multiband raster object and returns a raster object with the operation applied.
CIg	Calculates the Green Chlorophyll Index (CIg) from a multiband raster object and returns a raster object with the index values.
CIre	Calculates the Red-Edge Chlorophyll Index (CIre) from a multiband raster object and returns a raster object with the index values.
ClayMinerals	Calculates the Clay Minerals (CM) ratio from a multiband raster object and returns a raster object with the index values.
EVI	Calculates the Enhanced Vegetation Index (EVI) from a multiband raster object and returns a raster object with the index values.
FerrousMinerals	Calculates the Ferrous Minerals (FM) ratio from a multiband raster object and returns a raster object with the index values.
GEMI	Calculates the Global Environmental Monitoring Index (GEMI) from a multiband raster object and returns a raster object with the index values.
GNDVI	Calculates the Green Normalized Difference Vegetation Index (GNDVI) from a multiband raster object and returns a raster object with the index values.
GVITM	Calculates the Green Vegetation Index for Landsat TM (GVITM) from a Landsat TM image and returns a raster object with the index values.
IronOxide	Calculates the Iron Oxide (IO) ratio from a multiband raster object and returns a raster object with the index values.
MSAVI	Calculates the Modified Soil Adjusted Vegetation Index (MSAVI2) from a multiband raster object and returns a raster object with the index values.
MTVI2	Calculates the Modified Triangular Vegetation Index (MTVI2) from a multiband raster object and returns a raster object with the index values.
NDVI	Calculates the Normalized Difference Vegetation Index (NDVI) from a multiband raster object and returns a raster object with the index values.
NDVIre	Calculates the Red-Edge Normalized Difference Vegetation Index (NDVIre) from a multiband raster object and returns a raster object with the index values.
NDWI	Calculates the Normalized Difference Water Index (NDWI) from a multiband raster object and returns a raster object with the index values.
PVI	Calculates the Perpendicular Vegetation Index (PVI) from a multiband raster object and returns a raster object with the index values.
RasterCalculator	Provides access to all existing math functions and returns a raster object with the mathematical operation applied.
RTVICore	Calculates the Red-Edge Triangulated Vegetation Index (RTVICore) from a multiband raster object and returns a raster object with the index values.
SAVI	Calculates the Soil Adjusted Vegetation Index (SAVI) from a multiband raster object and returns a raster object with the index values.
SRre	Calculates the Red-Edge Simple Ratio (SRre) from a multiband raster object and returns a raster object with the index values.
Sultan	Calculates Sultan's formula from a six-band 8-bit raster object and returns a three-band 8-bit raster object.
TSAVI	Calculates the Transformed Soil Adjusted Vegetation Index (TSAVI) from a multiband raster object and returns a raster object with the index values.
VARI	Calculates the Visible Atmospherically Resistant Index (VARI) from a multiband raster object and returns a raster object with the index values.

Reclass

Function	Description
Remap	Categorizes the pixel values of the raster data into groups with specific values.

Statistical

Function	Description
ArgStatistics	Creates a raster object where each pixel contains the band index at which that pixel reached the statistical argument. If the input raster is multidimensional, the output raster object will contain dimension values instead of band indices.
Statistics	Calculates statistics for each cell of an image based on a defined focal neighborhood.

Surface

Function	Description
AspectSlope	Creates a raster object that simultaneously displays the aspect and slope of a surface.
ElevationVoidFill	Creates pixels on a raster object where holes exist in the elevation.
ShadedRelief	Creates a color 3D representation of the terrain by merging the images from the elevation-coded and hillshade methods.