The Global Real-time Disaster and Environmental Monitoring Satellite


(This page is under development) 


The GRDEMSat is a spin-off of the next-generation LandSat design (the High Spectral and Spatial Resolution Instrument, HSSRI).  Features of currently available instruments can be found on the HSSRI page.  It is essentially one-fourth of the traditional LandSat, plus some additional features related to off-axis pointing and signal enhancement.  Operational considerations are based on experience gained from the EO-1 Project.  For information on the newly proposed Landsat for the 21st Century, see:



* Environmental disaster monitoring

* Humanitarian disaster monitoring

* Land use

* Mapping
* Biodiversity
* Habitat fragmentation
* Forest management
* Crop distribution
* Crop infestations
* Sedimentation
* Shoreline erosion

* Glacial retreat

* Desertification

* Wetland evaluation

* Coral reef status
* Waste spills and contamination
* Reservoir water quality
* Algal blooms


GRDEMSat General characteristics

* VIS-NIR Bands - Full Spectral Imaging, Ground Resolution:15m
* SWIR Bands - Full Spectral Imaging, Ground Resolution: 30m
* Blue, Green, Red, and NIR "Sharpening Bands", Spectro-Spatial CompressionŠ, Ground Resolution: 1.5m
* Swath Width - ~40 Km [TBD]
* Altitude ~450 Km

Details of the GRDEMSat:

* Full "Pushbroom" system (no scan mirrors)
* Full Spectral Imaging (VIS-NIR and SWIR) to replace Hyperspectral (many bands) Imaging
  [see Full Spectral Imaging SPECTRAL IMAGING.htm]
* No on-board calibration systems (calibration relies on vicarious means and instrument stability)
  [see Empirical Reflectance Retrieval Reflectance Retrieval.htm]
* Full spectral imaging data processing system
* On-board "spectro-spatial" data compression system

* Time Delay and Integrate (TDI) high spatial resolution system
* Non-linear sensor digitization systems
* On-board geolocation system
* Forward motion compensation for elimination of pixel smear

* Back-tracking or oversampling for signal enhancement
* Image correlation pointing stabilization and tracking system

* Yaw and roll control system for compensation for Earth rotation
* Direct broadcast data transmission
* Peer-to-peer, grid, data sharing and archiving

[More detailed information coming soon]



This page was last modified on 12 February 2015

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