node-gdal node-gdal

  • API Docs for Version: 0.11.0

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    gdal.Layer

    A representation of a layer of simple vector features, with access methods.

    Table of Contents

    Methods

    flush ()

    Defined in src/gdal_layer.cpp:198

    Flush pending changes to disk.

    getExtent
    (
    • force=true
    )
    gdal.Envelope

    Defined in src/gdal_layer.cpp:215

    Fetch the extent of this layer.

    Parameters:

    • [force=true] Boolean optional

    Returns:

    gdal.Envelope:

    Bounding envelope

    getSpatialFilter () gdal.Geometry

    Defined in src/gdal_layer.cpp:254

    This method returns the current spatial filter for this layer.

    Returns:

    gdal.Geometry
    setAttributeFilter
    (
    • filter
    )

    Defined in src/gdal_layer.cpp:325

    Sets the attribute query string to be used when fetching features via the layer.features.next() method. Only features for which the query evaluates as true will be returned.

    The query string should be in the format of an SQL WHERE clause. For instance "population > 1000000 and population < 5000000" where population is an attribute in the layer. The query format is normally a restricted form of SQL WHERE clause as described in the "WHERE" section of the OGR SQL tutorial. In some cases (RDBMS backed drivers) the native capabilities of the database may be used to interprete the WHERE clause in which case the capabilities will be broader than those of OGR SQL.

    Parameters:

    • filter String

    Example:

    layer.setAttributeFilter('population > 1000000 and population < 5000000');`
    setSpatialFilter
    (
    • filter
    )

    Defined in src/gdal_layer.cpp:274

    This method sets the geometry to be used as a spatial filter when fetching features via the layer.features.next() method. Only features that geometrically intersect the filter geometry will be returned.

    Alernatively you can pass it envelope bounds as individual arguments.

    Parameters:

    Example:

    layer.setSpatialFilter(geometry);
layer.setSpatialFilter(minX, minY, maxX, maxY);`
    testCapability
    (
    • capability
    )
    Boolean

    Defined in src/gdal_layer.cpp:206

    Determines if the dataset supports the indicated operation.

    Parameters:

    Returns:

    Boolean

    Attributes

    ds

    gdal.Dataset readonly

    Defined in src/gdal_layer.cpp:390

    features

    gdal.LayerFeatures readonly

    Defined in src/gdal_layer.cpp:481

    fidColumn

    String readonly

    Defined in src/gdal_layer.cpp:449

    fields

    gdal.LayerFields readonly

    Defined in src/gdal_layer.cpp:492

    geomColumn

    String readonly

    Defined in src/gdal_layer.cpp:433

    geomType

    Integer (see #crossLink "Constants (wkb)"geometry types/crossLink) readonly

    Defined in src/gdal_layer.cpp:465

    name

    String readonly

    Defined in src/gdal_layer.cpp:417