![]() ![]() Results show marked changes in that system over the last 30 years, but also point out the need for establishing clear protocols for glacier monitoring from remote-sensing data. We present an example analysis of change in Cordillera Blanca glaciers, as determined by comparing data in the GLIMS Glacier Database to historical data. The glacier and ASTER footprint layers may be queried for scalar attribute data, such as analyst name and date of contribution for glacier data, and acquisition time and browse imagery for the ASTER footprint layer. ![]() Map layers include glacier outlines, footprints of ASTER satellite optical images acquired over glaciers, and Regional Center information. There, users can browse custom maps, display various data layers, query information within the GLIMS database, and download query results in different GIS-compatible formats. The GLIMS Glacier Database is accessible on the World Wide Web at “ ”. The WMS, an Open Geospatial Consortium (OGC)-compliant web interface, makes GLIMS glacier data available to other data servers. ![]() Data received by the GLIMS team at the National Snow and Ice Data Center (NSIDC) in Boulder, Colorado are ingested into a spatially-enabled database (PostGIS) and made available via a website featuring an interactive map, and a Web-Mapping Service (WMS). Each institution (called a Regional Center, or RC) oversees the analysis of satellite imagery for a particular region containing glacier ice. Sample applications illustrating the developed techniques are also shown.The Global Land Ice Measurement from Space (GLIMS) project is a cooperative effort of over sixty institutions world-wide with the goal of inventorying a majority of the world's estimated 160 000 glaciers. This article addresses remote sensing and Geographic Information Science techniques developed within the framework of GLIMS in order to fulfill the goals of this distributed project. The project as a whole was originated, and has been coordinated by, the US Geological Survey (Flagstaff, AZ), which has also led the development of an interactive tool for automated analysis and manual editing of glacier images and derived data (GLIMSView). A global glacier database has been designed and implemented at the National Snow and Ice Data Center (Boulder, CO) parameters have been expanded from those of the World Glacier Inventory (WGI), and the database has been structured to be compatible with (and to incorporate) WGI data. The Data Dictionary contains detailed information about the fields in each table, and the Entity Relation Diagram illustrates the relationships between the tables. Specialized needs for mapping glaciers in a distributed analysis environment require considerable work developing software tools: terrain classification emphasizing snow, ice, water, and admixtures of ice with rock debris change detection and analysis visualization of images and derived data interpretation and archival of derived data and analysis to ensure consistency of results from different Regional Centers. GLIMS Database: Details Information on the GLIMS NSIDC glacier database design The following represents the current state of the design of the GLIMS glacier relational database. The consortium is organized into a system of Regional Centers, each of which is responsible for glaciers in their region of expertise. Global Land Ice Measurements from Space (GLIMS) is an international consortium established to acquire satellite images of the world's glaciers, analyze them for glacier extent and changes, and to assess these change data in terms of forcings. ![]()
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