GLIMS Regional Centers are entitled to obtain ASTER data free of charge. For information on FTP access to a pool of ASTER and Landsat 7 data provided by EROS Data Center, see. 3 Acquiring ASTER Imagery ASTER acquisitions can be viewed in the GLIMS Glacier Viewer (), and searched for and ordered at. It can also serve as a filter: a user can import outlines generated in another package (via the shapefile format, provided they are in lon/lat coordinates), then use GLIMSView to add the metadata and export into the transfer format. GLIMSView has a plug-in structure for adding functionality, such as image classification algorithms. The GLIMS group at the USGS in Flagstaff, Arizona, has produced the software “GLIMSView”, with which a user can produce digitized glacier outlines, add appropriate metadata, and export the whole package into the GLIMS Data Transfer Format 2. These files are: session.shp, glaciers.shp, segments.shp, images.shp (with accompanying index and database files) 1. In this case the analyst must create all the necessary shapefiles manually, or using GLIMSView, to contain the outlines plus the required metadata. For example, an analysis may be done using GIS tools such as ERDAS, ArcGIS or ENVI. e Glacier D 2 Tools A variety of tools are being used in the GLIMS community to generate glacier outlines for GLIMS. 12 10 Submitting the source image of a glacier or set of glaciers. 12 As-of time (source time) of glacier outlines. 10 9 Population of Other Fields (including Null values). 10 Choosing the Location for a GLIMS Glacier ID. 7 7 Definition of “left” and “right” of segments. 4 6 Defining glacier outlines and their attributes. 12 Asof time (source time) of glacier outlines. 109 Population of Other Fields (including Null values). 10 Choosing the Location for a GLIMS Glacier ID. 77 Definition of “left” and “right” of segments. 46 Defining glacier outlines and their attributes. GLIMS Analysis TutorialBruce RaupSiri Jodha Singh Khalsa20100510 1 of 15Contents1 Introduction.
0 Comments
Leave a Reply. |