NAME

       Geo::GDAL::FFI::Layer - A collection of vector features in GDAL

SYNOPSIS

DESCRIPTION

       A set of (vector) features having a same schema (the same Defn object). Obtain a layer object by the
       CreateLayer or GetLayer method of a vector dataset object.

       Note that the system stores a reference to the parent dataset for each layer object to ensure layer
       objects remain viable.  If you are relying on a dataset object's destruction to flush its dataset cache
       and then close it then you need to ensure all associated child layers are also destroyed.  Failure to do
       so could lead to corrupt data when reading in newly written files.

METHODS

   GetDefn
        my $defn = $layer->GetDefn;

       Returns the FeatureDefn object for this layer.

   ResetReading
        $layer->ResetReading;

   GetNextFeature
        my $feature = $layer->GetNextFeature;

   GetFeature
        my $feature = $layer->GetFeature($fid);

   SetFeature
        $layer->SetFeature($feature);

   CreateFeature
        $layer->CreateFeature($feature);

   DeleteFeature
        $layer->DeleteFeature($fid);

   GetFeatureCount
        my $count = $layer->GetFeatureCount();

   GetExtent $layer->GetExtent(); $layer->GetExtent(1);
       Returns an array ref with [minx, miny, maxx, maxy].  Argument is a boolean to force calculation even if
       it is expensive.

   Intersection, Union, SymDifference, Identity, Update, Clip, Erase
        $result = $layer-><Method>($method, $args);

       Runs the <method> algorithm between layer and method layer. Named arguments are the following.

       "Result"
           Optional, allows the user to define the result layer.

       "Options"
           Optional, allows the user to define the options (see GDAL docs).

       "Progress"
           Optional, the progress indicator callback.

       "ProgressData"
           Optional, data for the progress callback.

LICENSE

       This software is released under the Artistic License. See perlartistic.

AUTHOR

       Ari Jolma - Ari.Jolma at gmail.com

SEE ALSO

       Geo::GDAL::FFI

       Alien::gdal, FFI::Platypus, <http://www.gdal.org>