Authors / CoAuthors
Unknown
Abstract
MODIS (Moderate Resolution Imaging Spectroradiometer) is the key instrument aboard the satellites Terra (EOS AM-1), launched on 18 December 1999 and Aqua (EOS PM-1), launched on 4 May 2002. MODIS views almost the entire surface of the Earth every day, acquiring data in 36 spectral bands over a 2330 km swath. MODIS data will improve the understanding of global dynamics and processes occurring on the land, in the oceans, and in the lower atmosphere. ACRES has been acquiring MODIS data since April 2000 and December 2002 from TERRA and ACQUA satellites respectively. Registered users can download this data free of cost from ACRES web site.
Product Type
dataset
eCat Id
47930
Contact for the resource
Custodian
Owner
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
-
- Satellite ImageryMODIS
- ( Theme )
-
- satellite imagery
-
- AU
- Australian and New Zealand Standard Research Classification (ANZSRC)
-
- Earth Sciences
- ( Theme )
-
- DC2020
-
- Published_Internal
Publication Date
2003-06-17T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
Topic Category
imageryBaseMapsEarthCover
Series Information
Lineage
The MODIS data set is acquired by earth orbiting remote sensing satellites. These satellites carry two types of sensor systems known as "active" and "passive". A "passive" system generally consists of an array of small sensors or detectors which record (as digital numbers) the amount of electro-magnetic radiation reflected and/or emitted from the Earth's surface. MODIS is a passive system. The digital data acquired by the satellites are transmitted to ground stations and can be used to reconstitute an image of the Earth's surface not too dissimilar to an aerial photograph. Data are received through the ACRES antennae at the Data Acquisition Facilities at Alice Springs and Hobart enabling coverage of the Australian landmass and New Zealand. The recorded data are air-freighted and sent via a high speed communication link daily to the Data Processing Facility in Canberra where it is catalogued and archived. Data are recorded and archived by orbit, or swath, allowing parts of the swath to be extracted by its geographical coordinates. If the region of interest extends across two adjacent paths the appropriate data set from each path will need to be extracted. Because of the orbital parameters of the satellite, adjacent paths are not acquired sequentially and information from each path may differ according to the time delay between the two passes. To assist cataloguing and ordering, a path is segmented into individual scenes. Diagrams and formulae are available to assist in relating geographical coordinates to the satellite orbit number. Each scene acquired by ACRES is sub-sampled and produced in its Digital Catalogue access to which is available through the WWW. Data are provided as digital data products which can be viewed and manipulated on a variety of software systems. However, the data transmitted to Earth from an Earth observation satellite are in a form unsuitable for use by customers so ACRES processes this raw data in varying degrees to produce products suitable for use by clients. ACRES processes MODIS data within 24 hours of acquisition and places it on the ACRES web pages for ftp download for a limited time. Historical MODIS data may be processed from raw data after a client has placed an order for a specific product. This is due to the large quantities of data received from a satellite and the large range of product options available.
Parent Information
Extents
[-44.0, -9.0, 112.0, 154.0]
Reference System
Spatial Resolution
Service Information
Associations
Source Information
Source data not available.