Main Page: Operations

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Main Page Arrow.png Operations Arrow.png
Create objects Modeler
List of operations in ILWIS
Operation name Description Keywords
Absolute value for raster coverage Generates a new numerical raster coverage or feature coverage based on the input data. The operation applied to all the pixels and each pixel value replaced with their corresponding absolute values. Raster, Numeric, Math
Absolute value for columns Generates a new numerical column based on the operation, applied to all the input column values. Table, Column, Math, Numeric
Adaptive bilateral filter Sharpens an image by increasing the slope of the edges without producing overshoot or undershoot. Image processing, Raster, Sharpen, Filter
Arccosine for raster coverage Generates a new numerical raster coverage or feature coverage based on the operation, applied to all the pixels. Visualization
Arccosine for columns Generates a new numerical column based on the operation, applied to all the input column values. ?????
Aggregate raster statistics Transpose the raster according to the method indicated by the second parameter. Aggregate, Raster, Geometry , Statistics
Aggregate columns Aggregate the values of a column based on second input column. Table, column, aggregate Operation
Area numbering Area numbering assigns unique pixel values in an output map for connected areas (areas consisting of pixels with the same value, class name, or ID) Area numbering, Raster, Identifier, Classification
Arcsine for rasters Generates a new numerical raster or feature coverage based on the operation, applied to all the pixels; values ?????
Arcsine for columns Generates a new numerical column based on the operation, applied to all the input column values. ?????
ArcTangent for rasters Generates a new numerical raster coverage/feature coverage based on the operation, applied to all the pixels. ?????
ArcTangent for columns Generates a new numerical column based on the operation, applied to all the input column values ?????
Bilateral filter Calculates the first, second, third, or mixed image derivatives using an extended Sobel operator, used in edge detection. Image processing, Raster, Noise reduction, Filter
Binary logical raster Generates a new boolean map based on the logical condition used ?????
Binary math features Generates a new feature coverage that puts all the features of both coverages into one coverage. Features, Merge
Binary math raster Generates a new numerical raster coverage based on the selected operator; applied to all the pixels. Raster, Operation
Binary math table Generates a new numerical table based on the operation, applied to all the cells of a column. Table, Operation
Box classification Performs a multi-spectral image classification according to training pixels in a sample set. Classification, Box, Raster
Box filter Blurs an image using the box filter. Image processing, Raster, Noise reduction, Filter,
Buffer Returns a buffer around the given geometry, with a radius up to the given distance. Features, Operation, Buffer
Ceiling value for rasters Generates a new numerical raster coverage based on the operation, applied to all the pixels. The operation round pixel values of a raster coverage toward negative infinity, meaning each pixel value is rounded to the nearest integer greater than or equal to that value. ?????
Ceiling value for columns Generates a new numerical column based on the operation, applied to all the input column values. The operation round the column values toward positive infinity, meaning each value is rounded to the nearest integer greater than or equal to that value. ?????
Column unary operation Generates a new numerical table based on the operation, applied to all the cells of a column. Table, operation Unary, Column
Cluster raster Unsupervised classification in which image data is grouped into spectral clusters (a maximum of 4 input bands allowed). Raster, Classification
Compare histograms Blurs an image using the box filter Image processing, Raster, Noise reduction, Filter
Contains feature geometry Returns a feature-index of all features that satisfy the contains constraint. Geometry, Coordinate, Coverage, Spatial relation
Correlation rasters Calculate the correlation between the pixel value of a stack of rasters (bands); the raster must have equal dimensions. Raster, statistics
Cosine for rasters Generates a new numerical raster coverage/feature coverage based on the operation, applied to all the pixels. ?????
Cosine for columns Generates a new numerical column based on the operation, applied to all the input column values. ?????
Covariance rasters Calculate the covariance between the pixel value of a stack of rasters (bands); the raster must have equal dimensions Raster, Statistics
Covered by feature geometry Returns a feature-index of all features that satisfy the CoveredBy constraint. Geometry, Coordinate, Coverage, Spatial relation
Covers feature geometry Returns a feature-index of all features that satisfy the covers constraint. Geometry, Coordinate, Coverage, Spatial relation
Convert column to other domain Translates the values of a string column in a table to a regular domain. Table, Domain, Transformation
Coordinate to pixel Translates a coordinate to a pixel location based on the supplied georeferenced. Pixel, Coordinate, Geometry, Transformation
Cosine for rasters Generates a new numerical raster coverage/feature coverage based on the operation, applied to all the pixels. ?????
Cosine for columns Generates a new numerical column based on the operation, applied to all the input column values. ?????
Create thematic domain ????? Domain, Create, Thematic, Item domain
Cross Generates a new boolean map based on the logical condition used. Cross, Raster, Table
Crosses Returns a feature-index of all features that satisfy the Crosses constraint. Geometry, Coordinate, Coverage, Spatial relation
Densify raster Allows you to reduce the pixel size of a map. Densify, Raster, map
Dilate filter Blurs an image using the box filter. Image processing, Raster, Morphology, Filter
Disjoint Returns a feature-index of all features that satisfy the disjoint constraint. Geometry, Coordinate, Coverage, Spatial relation
Distance raster Calculate raster map distances. Distance, Raster, Map
Equals Returns a feature-index of all features that satisfy the equals constraint. Geometry, Coordinate, Coverage, Spatial relation
Erode filter Erodes an image by using a specific structuring element Image processing, Raster, Morphology, Filter
Floor value for rasters Generates a new numerical raster coverage based on the operation, applied to all the pixels. The operation round pixels value of a raster coverage toward negative infinity, meaning each pixel value is rounded to the nearest integer less than or equal to that value. ?????
Floor value for columns Generates a new numerical column based on the operation, applied to all the input column values. The operation round the column values toward negative infinity, meaning each value is rounded to the nearest integer less than or equal to that value. ?????
Gaussian blur filter Blurring an image by a Gaussian function to reduce image noise and reduce detail. Image processing, Raster, Noise reduction, Filter
Gridding ????? ?????'
Group by Aggregates a table based on a certain column and aggregates each column values. Table, Aggregation, Column
Histogram equalization Equalizes the histogram of a grayscale image, normalizes the brightness and increases the contrast of the image. Image processing, Raster, Contrast
Http server ????? Server, http
Hyperbolic cosine for column generates a new numerical column based on the operation, applied to all the input column values. ?????
Hyperbolic cosine for raster generates a new numerical raster coverage based on the operation, applied to all the pixels ?????
Hyperbolic sine for column generates a new numerical column based on the operation, applied to all the input column values. ?????
Hyperbolic sine for raster generates a new numerical raster coverage based on the operation, applied to all the pixels ?????
If feature Constructs a new coverage based on a boolean selection described by the boolean map. The true pixels are taken from the first input map, the false pixels from the second map. Feature, Condition
If raster Constructs a new coverage based on a boolean selection described by the boolean map. The true pixels are taken from the first input map, the false pixels from the second map. Raster, Condition
ILWIS remote catalog Creates a url to access the catalog of a remote ilwis server Service, ILWIS remote
Intersects Returns a feature-index of all features that satisfy the intersects constraint. Geometry, Coordinate, Coverage, Spatial relation
Join attributes Join a base table or coverage with attributes from another table that share a common domain. Table, Coverage
Junction function Returns set value. This operation is only useful in the modeler, especially when using conditions. Value is not set if it is empty. junction
Laplace gradient filter Highlights regions of rapid intensity change, used in edge detection. Image processing, Raster, Edge detection, Filter
Linear raster filter Generates a new raster based on the conditions as specified in the linear filter definition Filter, Raster, Numeric
Log10 for rasters Generates a new numerical raster coverage/feature coverage based on the operation, applied to all the pixels. ?????
Log10 for columns Generates a new numerical column based on the operation, applied to all the input pixel values. ?????
MapCalc Generates a new numerical raster coverage based on the operation, applied to all the input pixel values. Math, Raster
Master georeference Sets the georeference for all operations that trigger an on the fly resampling of a grid coverage. Georeference
Median blur filter Smooths an image using the median filter with the k-size x k-size aperture. Image processing, Raster, Noise reduction, Filter
Mirror rotate raster Transpose the raster according to the method indicated by the second parameter. Raster, Geometry
Moving average The Moving average operation is a point interpolation which requires a point map as input and returns a raster map as output. Raster, Point map
Natural logarithm for rasters Generates a new numerical raster coverage/feature coverage based on the operation, applied to all the pixels. ?????
Natural Logarithm for columns Generates a new numerical column based on the operation, applied to all the input column values. ?????
Overlaps Returns a feature-index of all features that satisfy the Overlaps constraint Geometry, Coordinate, Coverage, Spatial relation
Point raster crossing Adds columns to the attribute table with for each column the values of intersection of the raster coverage bands with the point map. Raster, Point, Intersection, Cross
Pixel to coordinate Translates a pixel to a coordinate location based on the supplied georeference input file. pixel, Coordinate, Geometry, Transformation
Polygon to raster map Translates the points of a feature coverage to pixels in a raster map. Raster, Polygon, Vector
Point to raster map Translates a the points of a feature coverage to pixels in a raster map. Raster, point map, Vector
PostgreSQL catalog Creates a url to access the catalog of a postgresql database Service, Postgresql, Postgis, Database
Rank order filter Generates a new raster based on the conditions as specified in the rank order definition. Filter, Raster, Numeric
Raster grid size Returns the pixel extent of a grid coverage dimension. Raster, Size
Raster quantile Calculates a raster with the quantile value of the sorted z columns of a raster coverage. Raster, Statistics
Raster selection The operation select parts of the spatial extent or attributes to create a 'smaller' raster coverage Raster, Selection
Raster to point Translates the pixels of a raster coverage to points in a feature coverage. Point, Raster
? Calculates  ? ?
Raster value Returns the value at pixel location x, y (optional z) ?????
Relative aggregate raster Statistics Transpose the raster according to the method indicated by the second parameter. Raster, Statistics
Resample raster Translates a raster coverage from one geometry (coordinate system + georeference) to onther. Raster, Geometry, Transformation
Rescale input values to an output map Re-distributes values of an input map over a wider or narrower range of values in an output map. Stretching can for instance be used to enhance the contrast in your map when it is displayed. ?????
Save as Saves the object in a certain format Export, Format
Scharr filter Calculates the first, second, third, or mixed image derivatives using an extended scharr operator, it is more accurate than the Sobel operator Image processing, Raster, Edge detection, Filter
Select features The operation select parts of the spatial extent or attributes to create a 'smaller' feature coverage Feature, Selection
? The operation  ? ?
Selection The operation select one or more column and puts them in smaller table Table, Selection
Set value range Sets the value range of a coverage or column to a new value; all value outside the range will become undefined ?????
Set working catalog The working catalog is the only location were data maybe used without full url as path. It is a convenience system for creating more readable expressions Data
Sign for column Generates a new numerical column based on the operation, applied to all the input column values ?????
Sine for raster Generates a new numerical raster/feature coverage based on the operation, applied to all the pixels ?????
Slice raster Ranges of values of the input map are grouped together into one output class Raster, Classification
Sobel filter Calculates the first, second, third, or mixed image derivatives using an extended Sobel operator, used in edge detection Image processing, Raster, Edge detection, Filter
Spatial aggregation of raster coverage Generates a raster coverage according to a aggregation method. The aggregation method determines how pixel values are used in the aggregation. Aggregate, Raster, Geometry
Square root value for raster/Columns Generates a new numrical rastercoverage/featurecoverage based on the operation, applied to all the pixels; generates a new numerical column based on the operation, applied to all the input column values ?????
String find ????? ?????
String replace ????? ?????
String sub ????? ?????
TabCalc for Column Generates a new numerical column based on the operation, applied to all the input column values Math, Table, Column
Tangent for raster/Column Generates a new numerical raster/feature coverage based on the operation, applied to all the pixels; generates a new numerical column based on the operation, applied to all the input column values ?????
Test operation Dummy/test operation to test certain internal workings of the handling of operations Test
Text to output ????? Text, Output
Timesat filtering Iteratively filters a rastercoverage with a Savitzky-Golay moving filter Raster, Filter, Savitzky-golay
Touches Returns a feature-index of all features that satisfy the Touches constraint Geometry, Coordinate, Coverage, Spatial relation
Transform coordinates Transforms the coordinates of all vertices of the features from one coordinate system to another Features, Vector, Coordinate system
Web Feature Service Catalog Creates an url to access the catalog of a server Service, wfs
Within Returns a feature-index of all features that satisfy the within constraint Geometry, Coordinate, Coverage, Spatial relation