Regional Center may include additional attributes for their own purposes,īut non-standard attributes will be ignored during data ingest at NSIDC.Īlso, optional attributes from the list below may be omitted by a Regional The following table lists the attributes contained in each shapefile. "ESRI Shapefile Technical Description: An ESRI White Paper" for Polygon of image footprint, or part of mosaic made up from this imageĬenter of mass (point) of vector set, or convex hull around vectors Outline of region, or point in middle of region, or point where RC is located List of shapefiles for GLIMS data transfer. Not allĪttributes in each shapefile are mandatory, however. RC, as they contain the mandatory items for any submission. "Geometry" refers to what kind of geometric objects are in the shapefiles.įour of the shapefiles are mandatory for any submission from an Images, point measurements, and ancillary data. Hold information about displacement vector sets, area-elevation histograms, In addition, there are other shapefiles to Information (RC info), a "glaciers" shapefile to convey per-glacierĪttributes, and a "segments" shapefile to hold all the glacier outline There is a "session" shapefile to convey the highest level This hierarchy is reflected in the choice of shapefiles and attributesīelow. per segment (each segment in a glacier outline can have its own attributes).per basin or glacier (each glacier has its own name, location, etc.).per analysis session (each analysis session is done by one regional.GLIMS glacier data and metadata fall into three categories they can be: dbf file contains the attributes and the. Their GLIMS glacier analysis using GIS packages or GLIMSView, and therefore shapefilesĪ shapefile actually consists of three files, all with the same basename,īut ending in. it is anticipated that most Regional Centers will do.GLIMSView, a custom tool for GLIMS analysis, exports data directly the open-source (and free) GIS "GRASS" can input.There are freely available, open-source libraries and utilities for reading it is a published format with wide support in the GIS.The ESRI shapefile format was chosen because Flexibility to accommodate possible future changes.Minimization of programming required for Regional Centers and NSIDC.Platform-independent, as are ASCII text files. The file formats should be readable and writable Bibliographic data can beĬonveyed in an Endnote-formatted ASCII text file.ĭesign considerations for this specification include: These different levels of information areĬonveyed in a hierarchy of ESRI shapefiles. In a given submission to NSIDC, a Regional Center provides informationĪbout their institution, the glaciers (names, size, etc.), and polygonal outlinesĬircumscribing the glaciers. The formats and conventions for the files that convey these data. Global Land Ice Measurements from Space) data base. GLIMS analysis performed at the Regional Centers (RCs) to NSIDC ( National Snow and Ice Data Center) for ingest The following outlines a method for transferring the results of GLIMS: Data Transfer Specification GLIMS: Global Land Ice Measurements from Space Monitoring the World's Changing GlaciersĪ Method for Transferring GLIMS Analysis Products from Regional Centers to NSIDC Specfication Version 1.2
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