Class: GeoConcerns::Extractors::FgdcMetadataExtractor

Inherits:
Object
  • Object
show all
Defined in:
app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb

Constant Summary collapse

TOPIC_CATEGORIES =

ISO 19115 Topic Category

{
  farming: 'Farming',
  biota: 'Biology and Ecology',
  climatologyMeteorologyAtmosphere: 'Climatology, Meteorology and Atmosphere',
  boundaries: 'Boundaries',
  elevation: 'Elevation',
  environment: 'Environment',
  geoscientificinformation: 'Geoscientific Information',
  health: 'Health',
  imageryBaseMapsEarthCover: 'Imagery and Base Maps',
  intelligenceMilitary: 'Military',
  inlandWaters: 'Inland Waters',
  location: 'Location',
  oceans: 'Oceans',
  planningCadastre: 'Planning and Cadastral',
  structure: 'Structures',
  transportation: 'Transportation',
  utilitiesCommunication: 'Utilities and Communication',
  society: 'Society'
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(doc) ⇒ FgdcMetadataExtractor

Returns a new instance of FgdcMetadataExtractor.



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 5

def initialize(doc)
  @doc = doc
end

Instance Attribute Details

#doc ⇒ Object (readonly)

Returns the value of attribute doc.



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 4

def doc
  @doc
end

Instance Method Details

#coverage ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 32

def coverage
  doc.at_xpath('//idinfo/spdom/bounding').tap do |node|
    return GeoConcerns::Coverage.new(
      coverage_coordinate(node, 'north'),
      coverage_coordinate(node, 'east'),
      coverage_coordinate(node, 'south'),
      coverage_coordinate(node, 'west')
    ).to_s
  end
  nil
end

#coverage_coordinate(node, direction) ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 44

def coverage_coordinate(node, direction)
  node.at_xpath("#{direction}bc").text.to_f
end

#creators ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 65

def creators
  extract_multivalued('//idinfo/citation/citeinfo/origin')
end

#issued ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 48

def issued
  doc.at_xpath('//idinfo/citation/citeinfo/pubdate').tap do |node|
    return node.text[0..3].to_i unless node.nil? # extract year only
  end
  nil
end

#keywords ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 73

def keywords
  keywords = extract_multivalued('//idinfo/keywords/theme/themekey')
  keywords.map! { |k| TOPIC_CATEGORIES[k.to_sym].present? ? TOPIC_CATEGORIES[k.to_sym] : k }
  keywords.uniq!
  keywords.present? ? keywords : nil
end

#metadata_optional ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 22

def metadata_optional
  {
    issued: issued,
    publisher: publishers,
    spatial: placenames,
    subject: keywords,
    temporal: timeperiods
  }.compact
end

#metadata_required ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 13

def metadata_required
  {
    coverage: coverage,
    creator: creators,
    description: [doc.at_xpath('//idinfo/descript/abstract').text],
    title: [doc.at_xpath('//idinfo/citation/citeinfo/title').text]
  }.compact
end

#placenames ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 69

def placenames
  extract_multivalued('//idinfo/keywords/place/placekey')
end

#publishers ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 61

def publishers
  extract_multivalued('//idinfo/citation/citeinfo/pubinfo/publish')
end

#timeperiods ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 55

def timeperiods
  ::GeoConcerns::TimePeriod.new(
    extract_multivalued('//idinfo/keywords/temporal/tempkey'), doc
  ).value
end

#to_hash ⇒ Object 



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# File 'app/models/concerns/geo_concerns/extractors/fgdc_metadata_extractor.rb', line 9

def to_hash
  metadata_required.merge(metadata_optional)
end