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>