Create topological features
This example uses existing regular features to create the following new topological features:
topological line feature
topological polygon feature (which also uses the topological line feature)
topological network feature (which also uses the topological line feature)
Note
Creating topological features is different than resolving/reconstructing
them to a specific reconstruction time. Typically topological features are created/built using GPlates,
but they can also be created using pyGPlates and this section shows how to do that.
Sample code
import pygplates
def find_referenced_features(
features,
referenced_feature_id_strings):
referenced_feature_features = []
for referenced_feature_id_string in referenced_feature_id_strings:
for feature in features:
if feature.get_feature_id().get_string() == referenced_feature_id_string:
referenced_feature_features.append(feature)
break
return referenced_feature_features
def create_topological_sections(
referenced_features,
topological_geometry_type):
topological_sections = []
for referenced_feature in referenced_features:
topological_section = pygplates.GpmlTopologicalSection.create(
referenced_feature,
topological_geometry_type=topological_geometry_type)
if topological_section:
topological_sections.append(topological_section)
return topological_sections
def create_topological_network_interiors(
referenced_features):
topological_network_interiors = []
for referenced_feature in referenced_features:
topological_network_interior = pygplates.GpmlTopologicalSection.create_network_interior(
referenced_feature)
if topological_network_interior:
topological_network_interiors.append(topological_network_interior)
return topological_network_interiors
def create_topological_line_feature(
features,
topological_line_referenced_feature_id_strings,
topological_line_feature_type):
topological_line_referenced_features = find_referenced_features(
features,
topological_line_referenced_feature_id_strings)
topological_line_sections = create_topological_sections(
topological_line_referenced_features,
pygplates.GpmlTopologicalLine)
topological_line_feature = pygplates.Feature.create_topological_feature(
topological_line_feature_type,
pygplates.GpmlTopologicalLine(topological_line_sections))
return topological_line_feature
def create_topological_polygon_feature(
features,
topological_polygon_referenced_feature_id_strings,
topological_polygon_feature_type):
topological_polygon_referenced_features = find_referenced_features(
features,
topological_polygon_referenced_feature_id_strings)
topological_polygon_sections = create_topological_sections(
topological_polygon_referenced_features,
pygplates.GpmlTopologicalPolygon)
topological_polygon_feature = pygplates.Feature.create_topological_feature(
topological_polygon_feature_type,
pygplates.GpmlTopologicalPolygon(topological_polygon_sections))
return topological_polygon_feature
def create_topological_network_feature(
features,
topological_network_boundary_referenced_feature_id_strings,
topological_network_interior_referenced_feature_id_strings,
topological_network_feature_type):
topological_network_boundary_referenced_features = find_referenced_features(
features,
topological_network_boundary_referenced_feature_id_strings)
topological_network_boundary_sections = create_topological_sections(
topological_network_boundary_referenced_features,
pygplates.GpmlTopologicalNetwork)
topological_network_interior_referenced_features = find_referenced_features(
features,
topological_network_interior_referenced_feature_id_strings)
topological_network_interiors = create_topological_network_interiors(
topological_network_interior_referenced_features)
topological_network_feature = pygplates.Feature.create_topological_feature(
topological_network_feature_type,
pygplates.GpmlTopologicalNetwork(
topological_network_boundary_sections,
topological_network_interiors))
return topological_network_feature
# The topological features we'll create.
topological_features = []
# Load the features that our topologies can reference.
features = pygplates.FeatureCollection('features.gpml')
topological_line_referenced_feature_id_strings = [
'GPlates-56f3c23d-1ee5-47a9-a46e-006d2aa463c3',
'GPlates-0ba4c93d-474e-4d9b-8f1b-618cb21024de',
'GPlates-84be6d41-6c32-4184-9c44-c38e399090a0',
'GPlates-3df7a9df-aefc-403e-a16c-faf203776fd1',
'GPlates-56f22e61-ddd5-4c2f-ae41-54e5f66f47ec']
# Create a topological line.
topological_line_feature = create_topological_line_feature(
features,
topological_line_referenced_feature_id_strings,
pygplates.FeatureType.gpml_unclassified_feature)
topological_features.append(topological_line_feature)
# Add the topological line to the list of features that topologies can reference.
# The topological line will be referenced in turn by a topological polygon and a topological network (below).
features.add(topological_line_feature)
topological_polygon_referenced_feature_id_strings = [
'GPlates-5369725b-5ca6-49b2-83c6-0417dbb5fca2',
'GPlates-48bd0e0f-e7c8-4dea-9e0a-4bc0e1403db6',
'GPlates-71470e03-9e99-4205-80d9-727d7a3700de',
# Topological polygon references the topological line we created...
topological_line_feature.get_feature_id().get_string()]
# Create a topological polygon.
topological_polygon_feature = create_topological_polygon_feature(
features,
topological_polygon_referenced_feature_id_strings,
pygplates.FeatureType.gpml_topological_closed_plate_boundary)
topological_features.append(topological_polygon_feature)
topological_network_boundary_referenced_feature_id_strings = [
'GPlates-63b81b91-b7a0-4ad7-908d-16db3c70e6ed',
'GPlates-aa1d0d5a-0445-4380-a516-d2bc66e477a7',
'GPlates-e184b54d-abb0-465b-8820-c73c543d2562',
'GPlates-5369725b-5ca6-49b2-83c6-0417dbb5fca2',
# Topological network references the topological line we created...
topological_line_feature.get_feature_id().get_string(),
'GPlates-cc5b9027-d227-4e97-bb06-df26786fd1ec']
topological_network_interior_referenced_feature_id_strings = [
'GPlates-56ffca31-df55-4a3e-b943-06faa1407fed',
'GPlates-a913e755-deaf-4bc5-918a-a124611341c1']
# Create a topological network.
topological_network_feature = create_topological_network_feature(
features,
topological_network_boundary_referenced_feature_id_strings,
topological_network_interior_referenced_feature_id_strings,
pygplates.FeatureType.gpml_topological_network)
topological_features.append(topological_network_feature)
# Save the topological features we created.
pygplates.FeatureCollection(topological_features).write('topologies.gpml')
Details
First we load the GPML file features.gpml containing the regular features (see Input):
features = pygplates.FeatureCollection('features.gpml')
Then we collect a list of features ID strings identifying some of the regular features we just loaded (see the gpml:identity tags in Input) that our new topological line will reference:
topological_line_referenced_feature_id_strings = [
'GPlates-56f3c23d-1ee5-47a9-a46e-006d2aa463c3',
'GPlates-0ba4c93d-474e-4d9b-8f1b-618cb21024de',
'GPlates-84be6d41-6c32-4184-9c44-c38e399090a0',
'GPlates-3df7a9df-aefc-403e-a16c-faf203776fd1',
'GPlates-56f22e61-ddd5-4c2f-ae41-54e5f66f47ec']
Then we create the topological line feature by calling our own function create_topological_line_feature, passing the regular features, the list of features referenced by the topological line and the feature type of the topological line:
topological_line_feature = create_topological_line_feature(
features,
topological_line_referenced_feature_id_strings,
pygplates.FeatureType.gpml_unclassified_feature)
Then we add the topological line feature to the list of features because it will be referenced in turn by our new topological polygon and topological network:
features.add(topological_line_feature)
Then we collect a list of features ID strings that our new topological polygon will reference:
topological_polygon_referenced_feature_id_strings = [
'GPlates-5369725b-5ca6-49b2-83c6-0417dbb5fca2',
'GPlates-48bd0e0f-e7c8-4dea-9e0a-4bc0e1403db6',
'GPlates-71470e03-9e99-4205-80d9-727d7a3700de',
# Topological polygon references the topological line we created...
topological_line_feature.get_feature_id().get_string()]
Note
The topological polygon feature references the topological line feature that we just created (in addition to regular features) since it forms part of the boundary of the polygon.
Then we create the topological polygon feature by calling our own function create_topological_polygon_feature, passing the regular features (and topological line), the list of features referenced by the topological polygon and the feature type of the topological polygon:
topological_polygon_feature = create_topological_polygon_feature(
features,
topological_polygon_referenced_feature_id_strings,
pygplates.FeatureType.gpml_topological_closed_plate_boundary)
Then we collect a list of features ID strings that our new topological polygon will reference. A topological network has a boundary (which is a list of boundary sections) and interior geometries (which is a list of interior sections). So we have two lists of feature ID strings:
topological_network_boundary_referenced_feature_id_strings = [
'GPlates-63b81b91-b7a0-4ad7-908d-16db3c70e6ed',
'GPlates-aa1d0d5a-0445-4380-a516-d2bc66e477a7',
'GPlates-e184b54d-abb0-465b-8820-c73c543d2562',
'GPlates-5369725b-5ca6-49b2-83c6-0417dbb5fca2',
# Topological network references the topological line we created...
topological_line_feature.get_feature_id().get_string(),
'GPlates-cc5b9027-d227-4e97-bb06-df26786fd1ec']
topological_network_interior_referenced_feature_id_strings = [
'GPlates-56ffca31-df55-4a3e-b943-06faa1407fed',
'GPlates-a913e755-deaf-4bc5-918a-a124611341c1']
Note
The boundary of the topological network feature references the topological line feature that we created previously (in addition to regular features).
Then we create the topological network feature by calling our own function create_topological_network_feature, passing the regular features (and topological line), the list of features referenced by the topological network boundary, the list of features referenced by the topological network interior and the feature type of the topological network:
topological_network_feature = create_topological_network_feature(
features,
topological_network_boundary_referenced_feature_id_strings,
topological_network_interior_referenced_feature_id_strings,
pygplates.FeatureType.gpml_topological_network)
Create a topological line feature
def create_topological_line_feature(
features,
topological_line_referenced_feature_id_strings,
topological_line_feature_type):
topological_line_referenced_features = find_referenced_features(
features,
topological_line_referenced_feature_id_strings)
topological_line_sections = create_topological_sections(
topological_line_referenced_features,
pygplates.GpmlTopologicalLine)
topological_line_feature = pygplates.Feature.create_topological_feature(
topological_line_feature_type,
pygplates.GpmlTopologicalLine(topological_line_sections))
return topological_line_feature
First we find the regular features referenced by our topological line by calling our own function find_referenced_features, passing the regular features and the list of features referenced by the topological line:
topological_line_referenced_features = find_referenced_features(
features,
topological_line_referenced_feature_id_strings)
Then we wrap each referenced feature into a topological section by calling our own function create_topological_sections, passing the features referenced by the topological line. We also specify the type of topological geometry we’re creating, which is pygplates.GpmlTopologicalLine:
topological_line_sections = create_topological_sections(
topological_line_referenced_features,
pygplates.GpmlTopologicalLine)
Finally we take our topological sections (that join together to form a line) and create a topological line geometry.
We then pass that, along with the feature type, into pygplates.Feature.create_topological_feature() to create our topological line feature:
topological_line_feature = pygplates.Feature.create_topological_feature(
topological_line_feature_type,
pygplates.GpmlTopologicalLine(topological_line_sections))
Create a topological polygon feature
def create_topological_polygon_feature(
features,
topological_polygon_referenced_feature_id_strings,
topological_polygon_feature_type):
topological_polygon_referenced_features = find_referenced_features(
features,
topological_polygon_referenced_feature_id_strings)
topological_polygon_sections = create_topological_sections(
topological_polygon_referenced_features,
pygplates.GpmlTopologicalPolygon)
topological_polygon_feature = pygplates.Feature.create_topological_feature(
topological_polygon_feature_type,
pygplates.GpmlTopologicalPolygon(topological_polygon_sections))
return topological_polygon_feature
First we find the regular features (and topological line) referenced by our topological polygon by calling our own function find_referenced_features, passing the regular features and the list of features referenced by the topological polygon:
topological_polygon_referenced_features = find_referenced_features(
features,
topological_polygon_referenced_feature_id_strings)
Then we wrap each referenced feature into a topological section by calling our own function create_topological_sections, passing the features referenced by the topological polygon. We also specify the type of topological geometry we’re creating, which is pygplates.GpmlTopologicalPolygon:
topological_polygon_sections = create_topological_sections(
topological_polygon_referenced_features,
pygplates.GpmlTopologicalPolygon)
Finally we take our topological sections (that join together to form a polygon) and create a topological polygon geometry.
We then pass that, along with the feature type, into pygplates.Feature.create_topological_feature() to create our topological polygon feature:
topological_polygon_feature = pygplates.Feature.create_topological_feature(
topological_polygon_feature_type,
pygplates.GpmlTopologicalPolygon(topological_polygon_sections))
Create a topological network feature
def create_topological_network_feature(
features,
topological_network_boundary_referenced_feature_id_strings,
topological_network_interior_referenced_feature_id_strings,
topological_network_feature_type):
topological_network_boundary_referenced_features = find_referenced_features(
features,
topological_network_boundary_referenced_feature_id_strings)
topological_network_boundary_sections = create_topological_sections(
topological_network_boundary_referenced_features,
pygplates.GpmlTopologicalNetwork)
topological_network_interior_referenced_features = find_referenced_features(
features,
topological_network_interior_referenced_feature_id_strings)
topological_network_interiors = create_topological_network_interiors(
topological_network_interior_referenced_features)
topological_network_feature = pygplates.Feature.create_topological_feature(
topological_network_feature_type,
pygplates.GpmlTopologicalNetwork(
topological_network_boundary_sections,
topological_network_interiors))
return topological_network_feature
First we find the regular features (and topological line) referenced by the boundary of our topological network by calling our own function find_referenced_features, passing the regular features and the list of features referenced by the network boundary. We then wrap each referenced boundary feature into a topological section by calling our own function create_topological_sections, passing the features referenced by the network boundary. We also specify the type of topological geometry we’re creating, which is pygplates.GpmlTopologicalNetwork:
topological_network_boundary_referenced_features = find_referenced_features(
features,
topological_network_boundary_referenced_feature_id_strings)
topological_network_boundary_sections = create_topological_sections(
topological_network_boundary_referenced_features,
pygplates.GpmlTopologicalNetwork)
Next we find the regular features referenced by the interior of our topological network by calling our own function find_referenced_features, passing the regular features and the list of features referenced by the network interior. We then wrap each referenced interior feature into a topological section by calling our own function create_topological_network_interiors (similar to create_topological_sections but specific to the network interior), passing the features referenced by the network interior.
topological_network_interior_referenced_features = find_referenced_features(
features,
topological_network_interior_referenced_feature_id_strings)
topological_network_interiors = create_topological_network_interiors(
topological_network_interior_referenced_features)
Finally we take our topological boundary sections (that join together to form a polygon boundary) and our topological interior sections
(that form interior constraints within the deforming region) and create a topological network geometry.
We then pass that, along with the feature type, into pygplates.Feature.create_topological_feature() to create our topological network feature:
topological_network_feature = pygplates.Feature.create_topological_feature(
topological_network_feature_type,
pygplates.GpmlTopologicalNetwork(
topological_network_boundary_sections,
topological_network_interiors))
Find features referenced by a topology
def find_referenced_features(
features,
referenced_feature_id_strings):
referenced_feature_features = []
for referenced_feature_id_string in referenced_feature_id_strings:
for feature in features:
if feature.get_feature_id().get_string() == referenced_feature_id_string:
referenced_feature_features.append(feature)
break
return referenced_feature_features
This function simply iterates through the features and searches each feature’s feature ID
in the list of feature IDs referenced by the topological geometry. Any features that match are returned.
Create a topological section for each referenced feature
def create_topological_sections(
referenced_features,
topological_geometry_type):
topological_sections = []
for referenced_feature in referenced_features:
topological_section = pygplates.GpmlTopologicalSection.create(
referenced_feature,
topological_geometry_type=topological_geometry_type)
if topological_section:
topological_sections.append(topological_section)
return topological_sections
This function wraps each referenced feature in a topological section by calling pygplates.GpmlTopologicalSection.create().
A topological section will be a pygplates.GpmlTopologicalPoint if the referenced geometry is a point or a pygplates.GpmlTopologicalLineSection
if the referenced geometry is a polyline (or a topological line, provided it’s being added to a topological polygon or network as determined by topological_geometry_type).
Note
We are not specifying a geometry property name when calling pygplates.GpmlTopologicalSection.create(). This means the default geometry property name
(for the referenced feature type) is used. However it is sometimes possible for geometry to be placed in two different properties (with different property names).
If the geometry happened to be in a non-default geometry property then we would need to explicitly specify that property name.
Note
The reverse_order flag in pygplates.GpmlTopologicalSection.create() is not needed (can be left as default, as we have done here)
if the topological sections always intersect each other (or if they’re points, and hence have no orientation). This flag is only used when a line section stops
intersecting both its neighbouring line sections (known as rubber banding).
Create a topological network interior for each referenced feature
def create_topological_network_interiors(
referenced_features):
topological_network_interiors = []
for referenced_feature in referenced_features:
topological_network_interior = pygplates.GpmlTopologicalSection.create_network_interior(
referenced_feature)
if topological_network_interior:
topological_network_interiors.append(topological_network_interior)
return topological_network_interiors
This function wraps each referenced feature in a topological network interior by calling pygplates.GpmlTopologicalSection.create_network_interior().
A topological network interior is actually a pygplates.GpmlPropertyDelegate (which is what is stored inside a pygplates.GpmlTopologicalSection)
and is what references a specific geometry property within a feature (since a property delegate contains a property name and feature ID).
Note
Any regular geometry (point, multipoint, polyline, polygon) or topological line can be referenced by a topological network interior. If a regular polygon geometry is referenced then it will be treated as a rigid interior block in the topological network and will not be part of the deforming region. This means anything inside this interior polygon geometry will move rigidly using the plate ID of the referenced polygon feature.
Note
We are not specifying a geometry property name when calling pygplates.GpmlTopologicalSection.create_network_interior(). This means the default geometry property name
(for the referenced feature type) is used. However it is sometimes possible for geometry to be placed in two different properties (with different property names).
If the geometry happened to be in a non-default geometry property then we would need to explicitly specify that property name.
Input
The contents of the input file features.gpml:
<?xml version="1.0" encoding="UTF-8"?>
<gpml:FeatureCollection xmlns:gpml="http://www.gplates.org/gplates" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/XMLSchema-instance" gpml:version="1.6.0339" xsi:schemaLocation="http://www.gplates.org/gplates ../xsd/gpml.xsd http://www.opengis.net/gml ../../../gml/current/base">
<gml:featureMember>
<gpml:UnclassifiedFeature>
<gpml:identity>GPlates-63b81b91-b7a0-4ad7-908d-16db3c70e6ed</gpml:identity>
<gpml:revision>GPlates-70312c4a-66d8-4f3d-8daf-1a5818ff7cc7</gpml:revision>
<gpml:reconstructionPlateId>
<gpml:ConstantValue>
<gpml:value>0</gpml:value>
<gml:description></gml:description>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:plateId</gpml:valueType>
</gpml:ConstantValue>
</gpml:reconstructionPlateId>
<gpml:unclassifiedGeometry>
<gpml:ConstantValue>
<gpml:value>
<gml:OrientableCurve gml:orientation="+">
<gml:baseCurve>
<gml:LineString>
<gml:posList gml:dimension="2">30.015933113679623 -89.653669889720803 0.1281258847639748 -89.468031335503937 -29.759681344151701 -89.282392781287072 </gml:posList>
</gml:LineString>
</gml:baseCurve>
</gml:OrientableCurve>
</gpml:value>
<gml:description></gml:description>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:OrientableCurve</gpml:valueType>
</gpml:ConstantValue>
</gpml:unclassifiedGeometry>
<gml:name>section1</gml:name>
<gml:validTime>
<gml:TimePeriod>
<gml:begin>
<gml:TimeInstant>
<gml:timePosition gml:frame="http://gplates.org/TRS/flat">http://gplates.org/times/distantPast</gml:timePosition>
</gml:TimeInstant>
</gml:begin>
<gml:end>
<gml:TimeInstant>
<gml:timePosition gml:frame="http://gplates.org/TRS/flat">http://gplates.org/times/distantFuture</gml:timePosition>
</gml:TimeInstant>
</gml:end>
</gml:TimePeriod>
</gml:validTime>
</gpml:UnclassifiedFeature>
</gml:featureMember>
<gml:featureMember>
<gpml:UnclassifiedFeature>
<gpml:identity>GPlates-aa1d0d5a-0445-4380-a516-d2bc66e477a7</gpml:identity>
<gpml:revision>GPlates-425eb1d0-7376-4afd-9258-aaca689e1835</gpml:revision>
<gpml:reconstructionPlateId>
<gpml:ConstantValue>
<gpml:value>0</gpml:value>
<gml:description></gml:description>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:plateId</gpml:valueType>
</gpml:ConstantValue>
</gpml:reconstructionPlateId>
<gpml:unclassifiedGeometry>
<gpml:ConstantValue>
<gpml:value>
<gml:OrientableCurve gml:orientation="+">
<gml:baseCurve>
<gml:LineString>
<gml:posList gml:dimension="2">23.147306607655537 -96.151019287311172 38.740945161872403 -55.310537359600318 43.010631908860347 -19.853573504178655 </gml:posList>
</gml:LineString>
</gml:baseCurve>
</gml:OrientableCurve>
</gpml:value>
<gml:description></gml:description>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:OrientableCurve</gpml:valueType>
</gpml:ConstantValue>
</gpml:unclassifiedGeometry>
<gml:name>section2</gml:name>
<gml:validTime>
<gml:TimePeriod>
<gml:begin>
<gml:TimeInstant>
<gml:timePosition gml:frame="http://gplates.org/TRS/flat">http://gplates.org/times/distantPast</gml:timePosition>
</gml:TimeInstant>
</gml:begin>
<gml:end>
<gml:TimeInstant>
<gml:timePosition gml:frame="http://gplates.org/TRS/flat">http://gplates.org/times/distantFuture</gml:timePosition>
</gml:TimeInstant>
</gml:end>
</gml:TimePeriod>
</gml:validTime>
</gpml:UnclassifiedFeature>
</gml:featureMember>
<gml:featureMember>
<gpml:UnclassifiedFeature>
<gpml:identity>GPlates-0bfc4f2b-c672-47e1-a29e-7214bea0521e</gpml:identity>
<gpml:revision>GPlates-78edb882-13a5-48e0-b058-eb7ad5db3e31</gpml:revision>
<gpml:reconstructionPlateId>
<gpml:ConstantValue>
<gpml:value>0</gpml:value>
<gml:description></gml:description>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:plateId</gpml:valueType>
</gpml:ConstantValue>
</gpml:reconstructionPlateId>
<gpml:unclassifiedGeometry>
<gpml:ConstantValue>
<gpml:value>
<gml:OrientableCurve gml:orientation="+">
<gml:baseCurve>
<gml:LineString>
<gml:posList gml:dimension="2">46.723402993197702 -33.033910853576231 38.926583716089262 -21.895597600564173 28.345186125727821 -6.673236154781053 </gml:posList>
</gml:LineString>
</gml:baseCurve>
</gml:OrientableCurve>
</gpml:value>
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<gml:pos>-7.1465444497372816 -76.638108802987674</gml:pos>
</gml:Point>
</gml:pointMember>
<gml:pointMember>
<gml:Point>
<gml:pos>-6.8407045187705684 -62.253091750364177</gml:pos>
</gml:Point>
</gml:pointMember>
<gml:pointMember>
<gml:Point>
<gml:pos>-17.077692628611821 -62.601951440567611</gml:pos>
</gml:Point>
</gml:pointMember>
<gml:pointMember>
<gml:Point>
<gml:pos>-16.232765704854504 -77.830176342213377</gml:pos>
</gml:Point>
</gml:pointMember>
</gml:MultiPoint>
</gpml:value>
<gml:description></gml:description>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:MultiPoint</gpml:valueType>
</gpml:ConstantValue>
</gpml:unclassifiedGeometry>
<gml:name></gml:name>
<gml:validTime>
<gml:TimePeriod>
<gml:begin>
<gml:TimeInstant>
<gml:timePosition gml:frame="http://gplates.org/TRS/flat">http://gplates.org/times/distantPast</gml:timePosition>
</gml:TimeInstant>
</gml:begin>
<gml:end>
<gml:TimeInstant>
<gml:timePosition gml:frame="http://gplates.org/TRS/flat">http://gplates.org/times/distantFuture</gml:timePosition>
</gml:TimeInstant>
</gml:end>
</gml:TimePeriod>
</gml:validTime>
</gpml:UnclassifiedFeature>
</gml:featureMember>
</gpml:FeatureCollection>
Output
The contents of the output file topologies.gpml. Note that the feature IDs of the topological features will differ for each run:
<?xml version="1.0" encoding="UTF-8"?>
<gpml:FeatureCollection xmlns:gpml="http://www.gplates.org/gplates" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/XMLSchema-instance" gpml:version="1.6.0339" xsi:schemaLocation="http://www.gplates.org/gplates ../xsd/gpml.xsd http://www.opengis.net/gml ../../../gml/current/base">
<gml:featureMember>
<gpml:UnclassifiedFeature>
<gpml:identity>GPlates-242ae377-f6fd-4ecd-a1fe-1760e2fe13a9</gpml:identity>
<gpml:revision>GPlates-095a8012-72d5-48d3-bd37-d33672319f8a</gpml:revision>
<gpml:unclassifiedGeometry>
<gpml:ConstantValue>
<gpml:value>
<gpml:TopologicalLine>
<gpml:section>
<gpml:TopologicalPoint>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-56f3c23d-1ee5-47a9-a46e-006d2aa463c3</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:Point</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalPoint>
</gpml:section>
<gpml:section>
<gpml:TopologicalPoint>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-0ba4c93d-474e-4d9b-8f1b-618cb21024de</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:Point</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalPoint>
</gpml:section>
<gpml:section>
<gpml:TopologicalPoint>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-84be6d41-6c32-4184-9c44-c38e399090a0</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:Point</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalPoint>
</gpml:section>
<gpml:section>
<gpml:TopologicalPoint>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-3df7a9df-aefc-403e-a16c-faf203776fd1</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:Point</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalPoint>
</gpml:section>
<gpml:section>
<gpml:TopologicalPoint>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-56f22e61-ddd5-4c2f-ae41-54e5f66f47ec</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:Point</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalPoint>
</gpml:section>
</gpml:TopologicalLine>
</gpml:value>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:TopologicalLine</gpml:valueType>
</gpml:ConstantValue>
</gpml:unclassifiedGeometry>
</gpml:UnclassifiedFeature>
</gml:featureMember>
<gml:featureMember>
<gpml:TopologicalClosedPlateBoundary>
<gpml:identity>GPlates-e13e3a00-8841-4642-9ef2-885de70fe3c7</gpml:identity>
<gpml:revision>GPlates-057f735b-4f63-445b-8f5d-ebcb9a9f8b50</gpml:revision>
<gpml:boundary>
<gpml:ConstantValue>
<gpml:value>
<gpml:TopologicalPolygon>
<gpml:exterior>
<gpml:TopologicalSections>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-5369725b-5ca6-49b2-83c6-0417dbb5fca2</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-48bd0e0f-e7c8-4dea-9e0a-4bc0e1403db6</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-71470e03-9e99-4205-80d9-727d7a3700de</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-242ae377-f6fd-4ecd-a1fe-1760e2fe13a9</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:TopologicalLine</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
</gpml:TopologicalSections>
</gpml:exterior>
</gpml:TopologicalPolygon>
</gpml:value>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:TopologicalPolygon</gpml:valueType>
</gpml:ConstantValue>
</gpml:boundary>
</gpml:TopologicalClosedPlateBoundary>
</gml:featureMember>
<gml:featureMember>
<gpml:TopologicalNetwork>
<gpml:identity>GPlates-425b5dbe-0c59-4b84-89bf-524bb2cae155</gpml:identity>
<gpml:revision>GPlates-a3bfc37e-a018-46ef-8b44-e3acb56eedb3</gpml:revision>
<gpml:network>
<gpml:ConstantValue>
<gpml:value>
<gpml:TopologicalNetwork>
<gpml:boundary>
<gpml:TopologicalSections>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-63b81b91-b7a0-4ad7-908d-16db3c70e6ed</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-aa1d0d5a-0445-4380-a516-d2bc66e477a7</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-e184b54d-abb0-465b-8820-c73c543d2562</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-5369725b-5ca6-49b2-83c6-0417dbb5fca2</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-242ae377-f6fd-4ecd-a1fe-1760e2fe13a9</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:TopologicalLine</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
<gpml:section>
<gpml:TopologicalLineSection>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-cc5b9027-d227-4e97-bb06-df26786fd1ec</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LineString</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
<gpml:reverseOrder>false</gpml:reverseOrder>
</gpml:TopologicalLineSection>
</gpml:section>
</gpml:TopologicalSections>
</gpml:boundary>
<gpml:interior>
<gpml:TopologicalNetworkInterior>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-56ffca31-df55-4a3e-b943-06faa1407fed</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:LinearRing</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalNetworkInterior>
</gpml:interior>
<gpml:interior>
<gpml:TopologicalNetworkInterior>
<gpml:sourceGeometry>
<gpml:PropertyDelegate>
<gpml:targetFeature>GPlates-a913e755-deaf-4bc5-918a-a124611341c1</gpml:targetFeature>
<gpml:targetProperty xmlns:gpml="http://www.gplates.org/gplates">gpml:unclassifiedGeometry</gpml:targetProperty>
<gpml:valueType xmlns:gml="http://www.opengis.net/gml">gml:MultiPoint</gpml:valueType>
</gpml:PropertyDelegate>
</gpml:sourceGeometry>
</gpml:TopologicalNetworkInterior>
</gpml:interior>
</gpml:TopologicalNetwork>
</gpml:value>
<gpml:valueType xmlns:gpml="http://www.gplates.org/gplates">gpml:TopologicalNetwork</gpml:valueType>
</gpml:ConstantValue>
</gpml:network>
</gpml:TopologicalNetwork>
</gml:featureMember>
</gpml:FeatureCollection>