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The algorithms
Here is a list of the geoanalysis algorithms currently available in SEXTANTE:
Analysis tools for raster layers
Analytical Hierarchy Process (AHP)
.
Change Vector Analysis
.
Ordered Weighted Average (OWA)
.
Predictive models
.
ROC Curve
.
Soft classification
Supervised Classification
Unsupervised classification (clustering)
.
Basic hydrological analysis
A simple hydrological model
.
Channel network
.
Creature synthetic hyetograph
.
Flow accumulation
.
Geomorphological instantaneous Unit Hydrograph
.
Sink filling
.
Time to outlet
.
Upslope area from outlet zone
.
Upslope area from a single point
.
Watersheds
.
Basic tools for raster layers
Aggregate
.
Basic statistics
.
Change data type
.
Complete grid
.
Correlation between layers
.
Crop grid with polygon layer
.
Crop to valid data cells
.
Gradient lines
.
Histogram
.
Invert mask
.
Merge grids
.
Mirror/flip
.
Normalize
.
Sort
.
User-defined 3 X 3 filter
.
Void filling
.
Void filling (nearest neighbour)
.
Volume calculation
. .
Volumen between two layers
.
Raster buffers
Buffer
.
Threshold buffer
.
Calculus tools for raster layer
Raster calculator
.
Cost, distances and routes
Accumulated cost (anisotropic)
.
Accumulated cost (combined)
.
Accumulated cost (isotropic)
.
Cost in predefined routes
.
Cost in predefined routes (anisotropic)
.
Generate alternative routes
.
Least cost path
.
Polar to rect
.
Rect to polar
.
Sum of cost to all points
.
Focal statistics
Equal values count
.
Kurtosis (neighbourhood)
.
Larger values count (neighbourhood)
.
Lower values count (neighbourhood)
.
Maximum (neighbourhood)
Mayority (neighbourhood)
Mean (neighbourhood)
Median (neighbourhood)
.
Minimum (neighbourhood)
.
Minority (neighbourhood)
.
Radius of variance
.
Range (neighbourhood)
.
Skeweness (neighbourhood)
.
Variance (neighbourhood)
.
Fuzzy logic
Fuzzify
.
Geomorphometry and terrain analysis
Anisotropic coefficient of variation
.
Aspect
.
Convergence index
.
Curvatures
.
Elevation-relief ratio
.
Hypsometry
.
Landform classification
.
Protection index
.
Real area
.
Slope
.
Geostatistics
Semivariances (raster)
.
Image processing
Calibrate an image
.
Calibrate an image (regression)
.
Contrast stretching
.
Detect and vectorize individual trees
.
Equalize
.
Erosion/Dilation
.
HIS -> RGB
.
RGB -> HIS
.
Thinning
.
Indices and other hydrological parameters
C factor from NDVI
.
Distance to channel network
.
Edge contamination
.
Elevation over channel network
.
Max. value uphill
.
Mean value uphill
.
Net Balance
.
Slope length
.
Strahler Order
.
Topographic indices
.
Local statistics
Equal values count
.
Kurtosis
.
Larger values count
.
Lower values count
.
Maximum
.
Maximum value layer
.
Mayority
.
Mean
.
Median
.
Minimum
.
Minimum value layer
.
Minority
.
Range
.
Skewness
.
Variance
.
Location/allocation
Location/allocation
.
Pattern analysis
Diversity
.
Dominace
.
Fragmentation
. .
Number of different classes
.
Profiles
Cross sections
.
Flow line profile
.
Profile
.
Raster creation tools
Constant grid
.
Grid from function
.
Random DEM
.
Random grid (Bernoulli)
.
Random grid (normal)
.
Random grid (uniform)
.
Rasterizacion and interpolation
Density
.
Density (kernel)
.
Inverse Distance Weighting (IDW)
.
Kriging
.
Linear decrease
.
Nearest neighbour
.
Rasterize vector layer
.
Universal Kriging
.
Reclassify raster layers
Divide in n classes of equal amplitude
.
Divide in n classes of equal area
.
Reclassify
.
Reclassify in disjoint classes
.
Reclassify in ordered classes
.
Statistical methods
Bernoulli probability distribution
.
Chi squared probability distribution
.
Covariance matrix
.
Exponencial probability distribution
.
Multiple regression
.
Normal probability distribution
.
Principal Components Analysis
.
Regression
.
Student's probability distribution
.
Table tools
Basic statistics
.
Correlation between fields
.
Save as CSV
.
Tools for categorical raster layers
Aggregation index
.
Class statistics
.
Combine grids
.
Cross checking(Kappa index)
.
Filter clumps
.
Fragstats (area/density/edge metrics)
.
Fragstats (diversity metrics)
.
Grids from table and classified grid
.
Tools for line layers
Change line direction
.
Directional mean
.
Lines to equispaced points
.
Polylines to polygons
.
Simplify lines
Sinuosity
.
Split lines with points layer
.
Tools for point layers
Distance matrix
.
Mean center and standard distance
.
Median center
.
Minimum enclosing shapes
.
Nearest neighbour analysis
.
Points layer from table
.
Quadrant analysis
.
Ripley's K
.
Sample raster layers
.
Snap points to layer
.
Spatial autocorrelation
.
Spatial cluster
.
Tools for polygon layers
Centroids
.
Count points in polygons
.
Geometric properties of polygons
.
Grid statistics in polygons
.
Point statistics in polygons
.
Polygons to polylines
.
Tools for vector layers
Adjust n point polygon
.
Basic statistics
.
Buffer
.
Cluster
.
Correlation between fields
.
Clip
. Th
Create graticule
.
Field calculator
.
Merge
.
Disolve
Union
Difference
Intersection
Transform
.
Vectorization
Contour lines
.
Raster layer to points layer
. T
Vectorize raster layer (lines)
.
Vectorize raster layer (polygons)
.
Vegatation indices
CTVI
.
NDVI
.
NRVI
.
PVI(Perry and Lautenschlager)
.
PVI(Qi et al)
.
PVI(Richardson and Wiegand)
.
PVI(Walther and Shabaani)
.
TTVI
.
TVI
.
Visibility and lighting
Horizon blockage
.
Line of sight
.
Shaded relief
.
Solar radiation
.
Visibility
.
Visual exposure
.
(last edited October 13, 2008) -
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