The iLand Javascript API The iLand Javascript API

  • API Docs for Version: 2.0

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    Patches Class

    Defined in: ABE\abe_patches.js:1
    Module: ABE

    The patches object provides functions to create and manage spatial sub-divisions (patches) within a forest stand. Patches are defined on a 10x10m grid. They can be used for spatially explicit forest management.

    Use the patches property of the (current) stand variable to access the functionality.

     // create 2 random patches
 stand.patches.createRandomPatches(2);
 // get the list of patches
 var patch_list = stand.patches.list;
 // get the light influence field for the first patch
 log("LIF of first patch: " + stand.patches.lif(patch_list[0]));

    Methods

    clear

    ()

    Defined in ABE\abe_patches.js:66

    Removes all existing patches from the stand.

    createExtendedPatch

    (
    • patchId
    • newPatchId
    • [grow_by=1]
    )
    Integer

    Defined in ABE\abe_patches.js:36

    Creates a new patch by extending an existing patch. The new patch surrounds the existing patch with the given patchId.

    Parameters:

    • patchId Integer

      The ID of the existing patch to extend.

    • newPatchId Integer

      The ID for the new patch.

    • [grow_by=1] Integer optional

      The distance (in 10m cells) to extend the patch by.

    Returns:

    Integer:

    The number of cells added to the new patch.

    createFromGrid

    (
    • grid
    )
    Array

    Defined in ABE\abe_patches.js:105

    Creates patches from a raster grid. The grid is provided as a ScriptGrid object. For each unique value in the grid, a corresponding patch is created.

    Parameters:

    • grid ScriptGrid

      The input grid object.

    Returns:

    Array:

    A list of the created Patch objects.

    createPatch

    (
    • x
    • y
    • shape_string
    • [id=-1]
    )
    Boolean

    Defined in ABE\abe_patches.js:73

    Creates a single patch with a specific shape at a given location.

    Parameters:

    • x Double

      The x-coordinate (in meters) of the center of the shape.

    • y Double

      The y-coordinate (in meters) of the center of the shape.

    • shape_string String

      A string defining the shape, e.g., "circle(15)" for a circle with a 15m radius, or "rect(20,30)" for a 20x30m rectangle.

    • [id=-1] Integer optional

      The ID for the new patch. If -1, a new unique ID is generated.

    Returns:

    Boolean:

    true if the patch was created successfully, false otherwise.

    createRandomPatches

    (
    • n
    )

    Defined in ABE\abe_patches.js:57

    Creates a given number of random patches within the stand. The patches are non-overlapping and cover the entire stand area.

    Parameters:

    • n Integer

      The number of random patches to create.

    createRegular

    (
    • size
    • spacing
    )
    Array

    Defined in ABE\abe_patches.js:95

    Creates a regular pattern of patches (e.g., squares).

    Parameters:

    • size Integer

      The size of each patch in meters.

    • spacing Integer

      The spacing between patches in meters.

    Returns:

    Array:

    A list of the created Patch objects.

    createStrips

    (
    • width
    • horizontal
    )
    Array

    Defined in ABE\abe_patches.js:85

    Creates patches in the form of horizontal or vertical strips.

    Parameters:

    • width Double

      The width of the strips in meters.

    • horizontal Boolean

      If true, horizontal strips are created, otherwise vertical strips.

    Returns:

    Array:

    A list of the created Patch objects.

    lif

    (
    • patch
    )
    Double

    Defined in ABE\abe_patches.js:48

    Calculates the average value of the Light Influence Field (LIF) at 4m height for a given patch.

    Parameters:

    • patch Patch

      The patch object for which to calculate the average LIF.

    Returns:

    Double:

    The average LIF value for the patch.

    updateGrid

    ()

    Defined in ABE\abe_patches.js:115

    This method is usually called automatically. It re-creates the internal 10x10m grid representation of the patches from the list of patch objects. You might need to call this if you have manipulated the list of patches manually.

    Properties

    list

    Array

    Defined in ABE\abe_patches.js:19

    A list containing all Patch objects of the current stand.

    rectangle

    Object

    Defined in ABE\abe_patches.js:27

    The bounding rectangle of the stand in meters. This is a read-only property. The rectangle object has x, y, width, and height properties.