Arctic sea ice variations are sensitive to environmental changes and global changes. Freeboard thickness two important parameters in change research. Satellite altimetry can provide long-time large-scale monitoring. We estimated the freeboard its for period from 2002 2012 Envisat satellite data. To remove geoid undulations, we reprocessed data using a newly developed mean surface (MSS) model, n...

Information resources have increased rapidly in the big data era. Geospatial plays an indispensable role spatially informed analyses, while different areas are relatively isolated. Therefore, it is inadequate to use relational handling many semantic intricacies and retrieving geospatial data. In light of this, a heterogeneous retrieval method based on knowledge graph proposed this paper. There ...