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85 lines
2.5 KiB
Python
85 lines
2.5 KiB
Python
# Copyright 2012 Google Inc. All Rights Reserved.
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"""Representation of an Earth Engine FeatureCollection."""
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# Using old-style python function naming on purpose to match the
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# javascript version's naming.
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# pylint: disable-msg=C6003,C6409
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import collections
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import numbers
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import collection
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import ee_exception
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import feature
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import image
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import serializer
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class FeatureCollection(collection.Collection):
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def __init__(self, args): # pylint: disable-msg=W0231
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"""A representation of a FeatureCollection.
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Args:
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args: constructor argument. One of:
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A string - The name of a collection.
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A number - The ID of a Fusion Table.
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A feature.
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An array of features.
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A dict - a collections's JSON description.
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Raises:
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EEException: if passed something other than the above.
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"""
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if isinstance(args, feature.Feature):
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args = [args]
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if isinstance(args, basestring):
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args = {'type': 'FeatureCollection', 'id': args}
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elif isinstance(args, numbers.Number):
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args = {'type': 'FeatureCollection', 'table_id': args}
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elif isinstance(args, FeatureCollection):
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args = dict(args._description) # pylint: disable-msg=W0212
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elif isinstance(args, dict):
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# This is the default, but we need to check it before we get to iterable.
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pass
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elif isinstance(args, collections.Iterable):
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new_args = {
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'type': 'FeatureCollection',
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'features': [feature.Feature(x) for x in args]
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}
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args = new_args
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else:
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raise ee_exception.EEException('Unrecognized constructor argument.')
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self._description = args
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def getMapId(self, vis_params=None):
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"""Fetch and return a map id and token, suitable for use in a Map overlay.
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Args:
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vis_params: The visualization parameters. Currently only one parameter,
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'color', containing a hex RGB color string is allowed.
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Returns:
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An object containing a mapid string, an access token, plus a DrawVector
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image wrapping this collection.
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"""
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painted = image.Image({
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'algorithm': 'DrawVector',
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'collection': self,
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'color': (vis_params or {}).get('color', '000000')
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})
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return painted.getMapId({})
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def __str__(self):
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"""Writes out the collection in a human-readable form."""
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return 'FeatureCollection(%s)' % serializer.toJSON(self._description)
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def __repr__(self):
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"""Writes out the collection in an eval-able form."""
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return 'ee.FeatureCollection(%s)' % self._description
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