Please wait, while we are loading the content...
Please wait, while we are loading the content...
Content Provider | IEEE Xplore Digital Library |
---|---|
Author | Li, S. Sturm, M. Kyriazis, S. Logan, T. |
Copyright Year | 2000 |
Description | Author affiliation: Geophys. Inst., Alaska Univ., Fairbanks, AK, USA (Li, S.) |
Abstract | End-of-winter snow depth distribution in tundra, steppe, and prairie can be recovered from a sequence of optical images acquired during the snow melt if an energy balance model is used to calculate the melt rate. However, frequent occurrences of clouds over tundra areas like Alaskan North Slope reduce the probability of obtaining a suitable set of visible and infrared images during the rapid melt, which often takes less than 10 days. Sequence of images acquired by microwave sensors are ideal for catching such rapid changes because microwave sensors are capable of mapping the Earth's surface even under overcast conditions and during periods of dark. A sequence of RADARSAT full-resolution SAR images acquired with different standard beams were collected to maximize the temporal coverage of a study site at Ivotuk, Alaska, during the melt season in May 1999. The wide range of incidence angles (31/spl deg/-49/spl deg/) of the radar beams of the available RADARSAT SAR images makes it necessary to normalize radar backscatter between different beams. The rolling surface of the hilly terrain in the study area requires further corrections of geometric and radiometric distortions caused by slant range mapping and variations of local incidence and azimuth angles. For terrain correction of RADARSAT SAR images, a fine resolution of digital elevation model (DEM) is generated by averaging DEMs derived from interferometric pairs of ERS-1 and ERS-2 tandem SAR images. The resulting sequence of terrain-corrected and incidence angle normalized RADARSAT standard beam SAR images with a spatial resolution of 20 meters reveal backscatter variations caused by increase of snow wetness and exposure of bare ground due to snow melt, thus depicting the details of the snowmelt process in the study area. |
Starting Page | 481 |
Ending Page | 483 |
File Size | 624965 |
Page Count | 3 |
File Format | |
ISBN | 0780363590 |
DOI | 10.1109/IGARSS.2000.861603 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2000-07-24 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Snow Microwave sensors Radar imaging Backscatter Spatial resolution Optical distortion Optical interferometry Optical sensors Clouds Infrared imaging |
Content Type | Text |
Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
Sl. | Authority | Responsibilities | Communication Details |
---|---|---|---|
1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
Loading...
|