http://vocab.lternet.edu/vocab/vocab/http://vocab.lternet.edu/vocab/vocab/skos/224geographic information systems http://vocab.lternet.edu/vocab/vocab/skos/224 digital elevation model RT http://vocab.lternet.edu/vocab/vocab/skos/224 remote sensing RT http://vocab.lternet.edu/vocab/vocab/skos/224 geography BT http://vocab.lternet.edu/vocab/vocab/skos/224 spatial methods BT http://vocab.lternet.edu/vocab/vocab/skos/224 GIS UF