Near Real Time


GRAS provide satellite data in near real time as well as archive data from various medium to low resolution satellite sensors, e.g. MODIS Aqua and Terra, ENVISAT MERIS, NOAA, Meteosat and other medium to low resolution sensors. Based on data from these sensors it is possible to derive a numbers of different products. A few selected is described below.

True and false colour composites
Very often a simple colour composite is just as valuable as a derived product. GRAS can deliver global near real-time quicklooks of e.g. MODIS typically within a few hours after acquisition.
Sea Surface Temperature (SST)
Sea Surface Temperature can be used for a wide range of applications e.g. location of fronts and currents, assimilation and validation of oceanographic models, meteorological modelling and temporal analysis of Sea Surface Temperature for global change studies.
Chlorophyll-a concentration (for algae monitoring)
Chlorophyll-a maps can be used for a wide range of applications e.g. indicator of water quality, warning systems for harmful algae blooms, assimilation and validation of oceanographic models and temporal analysis of algae distribution patterns as indicators of changes to the aquatic environment e.g. due to eutrophication.
Diffuse attenuation coefficient (secchi depth)
The diffuse attenuation coefficient (K490) is an indicator of the turbidity of the water column – how visible light in the blue-green part of the spectrum penetrates the water column. The diffuse attenuation coefficient maps can be used for a wide range of applications related to water quality and turbidity.

The parameters mentioned above are especially suitable for monitoring the marine environment where low resolution satellites can monitor larges areas several times a day.

GRAS has profound expertise in handling and automating the routines involved in data processing. Procedures such as calibration, geometric rectification and format conversion are performed automatically and the data can be available to the client as soon as 30 minutes after the satellite overpass. The data are transferred via ftp and email alerts are sent out when new data become available. All data delivered in the format requested by the client and is ready for any further GIS analysis.