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Satellite Eye for Galathea 3 på
DTU
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Galathea right now |
Galathea-3 Follow the ship in Google Earth The ship is reproduced in scale (1:1) in Google Earth using Google SketchUp Loaction data delivered by DIFRES |
Cruise
track with data |
Galathea-3 Route with data direkt from the ship You can see the data by clicking on a time marker on the track Time is given as UTC (Universal time) You can also download the complete datafiles directly DATA Data delivered by DIFRES |
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Route as planned before departure. Markers indicate approximate target position at 10:00 UTC of the day. The route will be continously adapted according to the needs of the scientific projects. |
Galathea 3 in Copenhagen |
Galathea-3 in København Aerial photograph in Google Earth Galathea-3 in the harbour of Copenhagen before departure Friday August 11, 2006. Aerial Photograph by  |
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Phytoplankton Maps The algae or phytoplankton maps are based on Level 2 data from the MERIS-ENVISAT instrument. The Level 2 standard MERIS data products encompass radiance measured at each spectral band (band 1-14). These radiances are transferred into the so-called water-leaving reflectance after careful correction for atmospheric influence and disturbance. Additionally the standard products contain calculated maps of water constituents. The algae map is the most significant of these, and it is expressed with units of chlorophyll pigment in mg/m3. In the images, cloud and land areas are masked using threshold algorithms. A complicated bio-physical model and algorithms complex is needed in order to calculated the algae concentration. And since the signal from the water is quite low, some error has to be expected in the final product, typically +/- 30%, but more along cloud edges and along coasts. The resolution (each pixel) in the images is 1 x 1 km. |
Sea Surface Temperature
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High Resolution SST The gridded SST products are based upon satellite observations from several instruments (AATSR, AVHRR, AMSR, TMI, MODIS and SEVIRI). These include both infrared and microwave observations. As the infrared observations are limited by cloud cover and the microwave observations are rather coarse, an objective analysis method has been used to blend the data in an optimal way to produce a high resolution SST product. The method uses statistics to fill out the gaps and calculates a SST field every day with a resolution of approximately 5 km in latitude and longitude. The error on the SST will vary from below 0.3 degrees in cloudfree areas to about 0.7 degrees in regions with clouds and very variable conditions. For animations, see: http://ocean.dmi.dk/satellite In addition, a more coarse resolution global microwave image from Remote Sensing Systems in Californien is shown. |
Global Ozone |
OZONE The observations of total Ozone is presented in Dobson units and is based upon the measurements from the Ozone Monitoring Instrument (OMI) on the EOS AURA mission (http://aura.gsfc.nasa.gov/instruments/omi/index.html). The observations are performed during daylight where OMI provides daily global coverage. The absolute accuracy of the product is 3%. According to NASA, an ozone hole is defined as an area where the total ozone is below 220 Dobson units. The resolution of the global grid is 1.25 degrees in longitude and 1.0 degree in latitude |
Sea Ice |
Sea ice Opdated several times per day From NASA microwave radiometer data Produced by DTU See also http://www.seaice.dk .
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Wave heights |
Wave heightsr -------------------------------------------------------------------------------------------------------- |
Bathymetry |
Bathymetri - Depth of the ocean Stationary - is not updated Not measured by satellite Leveret af National Geophysical Data Center, US |
SSH anomaly |
SSH (Sea Surface Height) anomaly The figures are based upon near real-time observation of sea surface height from the altimetry satellites: ENVISAT, Jason-1 and Geosat Follow-On. The observations are anomalies, which means that the mean sea surface has been subtracted before gridding. In addition, the different satellite products have been adjusted to each other. The error on the individual satellite observations is about 5 centimeters. These observations from the individual tracks are subsequently gridded onto a global grid with a resolution of 0.25 degrees in longitude and latitude. A new grid is produced every day and is based upon observations from a week, with the newest observations being a few days old. For more information on the product, see: http://www.aviso.oceanobs.com/ |
Wind |
Ocean winds <>Ocean wind maps are mapped from two satellites: QuikSCAT and Envisat. <>Onboard QuikSCAT is a scatterometer that observes ocean wind speed and wind direction, i.e. the wind vector. Any location on Earth is observed (minimum) twice per day with a spatial resolution of 25 km. QuikSCAT global wind maps are obtained from NOAA http://manati.orbit.nesdis.noaa.gov/quikscat/. <> Onboard Envisat is an Advanced Synthetic Aperture Radar (ASAR). The normalized radar cross section data observed are translated to ocean wind maps at Risoe National Laboratory (link http://www.risoe.dk/galathea/opslag/satellitbilleder.htm) using the Johns Hopkins University, Applied Physics Laboratory software. The spatial resolution in the wind maps is 600 m. Each wind map covers a selected region near Galathea-3. For arkivbilleder: http://galathea.oersted.dtu.dk/google/kmz/images/Wind/ |
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Globalt cloud cover Updated 4-8 times per day. From Geostationary satellites around the Earth. Data from polar regions are unreliable. . From University of Bremen.. |
MERIS |
Visible image of mostly clouds. Produced by ESA This link goes to the latest relevant image available. For archive images see: http://galathea.oersted.dtu.dk/google/kmz/images/Vejr/ |
| Wave Heights |
SWH The figures are based upon near real-time observation of significant wave height (SWH) from the altimetry satellites: ENVISAT, Jason-1 and Geosat Follow-On. Significant wave height is defined as the average of the highest 1/3 of the waves. The satellite observes the SWH directly beneath the satellite in a circle with a diameter with approximately 5 km. The observations from the individual tracks are subsequently gridded onto a global grid with a resolution of 1 degree in laitude and longitude. The error on the satellite observations is about 0.2-0.3 meters. A new grid is produced every day and is based upon observations from a week, with the newest observations being a few days old. For more information on the product, see: http://www.aviso.oceanobs.com/ The resolution of the grid is 1 degree in longitude and latitude. |
Radar image (ASAR) |
Latest relevant radar images from ESA's ENVISAT satellite ENVISAT's Radar (ASAR) records images of up to 450 kilometer swath width as it orbits the Earth (WSM). Higher resolution of narrower swaths asa also sometimes available (IMM). This link goes to the latest relevant image available. For archive images see: http://galathea.oersted.dtu.dk/google/kmz/images/Radar/ |
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