The Compact High Resolution Imaging Spectrometer (CHRIS) recently captured telling images of red toxic sludge following the Ajka alumina plant accident in Devecser, Hungary that has recently been widely reported in the media. Unlike many satellite images of flooding disasters, there is no need to highlight the affected area in the image afterwards as the red sludge clearly stands out from the surrounding landscape.

Emergency monitoring is just one of the applications that the high-resolution CHRIS imager has been used for during the past 9 years. In fact, today marks the 9th birthday of the CHRIS imager which was launched on-board the European Space Agency’s PROBA-1 mission in October 2001. The hyperspectral data from CHRIS remains in high demand from the international scientific community and its rich, high-resolution imagery is used for precision farming, air quality assessment and seabed classification and much, much more.

The image above was acquired on October 14th, showing the extent of the disaster in great detail. Not bad for a nine year old!

The toxic sludge spill followed a collapsed reservoir on October 4 and initially affected about 40 square kilometres of land. Read more about the accident on BBC’s website.

In the first quarter of the New Year, a SSTL satellite will be launched. This time around it carries more than just a payload, it will contribute to charity.

Surrey Satellite Technology Limited showed that their satellite technology is not only beneficial for longer-term natural disaster monitoring; it also benefits the local community. When the new Surrey built UKDMC-2 satellite joins a group of six SSTL satellites in March in order to monitor and record natural disasters such as tsunamis, earth quakes, volcanic activity and flooding, it will also be carrying a message of benevolence.

Whilst building the spacecraft that is worth more than £5million, Dr Matt Perkins, Chief Executive of SSTL, came up with the idea of running a competition which would benefit a local charity. The winner of the competition would have the once in a lifetime opportunity to have their name or company logo printed alongside the satellite.

Galaxy Cars, a mini-cab company from Woking, won the competition by donating £8000 to Phyllis Tuckwell, a dedicated Hospice in Farnham that provides care to more than 100 people every day. Phyllis Tuckwell will also have their name printed on the space capsule.

Dr Perkins explained that he wanted to help the local community as SSTL’s work has a certain reach, which could be capitalised to promote charitable projects:

I was touched by what I heard about Phyllis Tuckwell and so we took the opportunity to raise funds for them and put their name into space

Sarah Brocklebank, Chief Executive of Phyllis Tuckwell Hospice, said:

I was delighted with the contribution and the opportunity of having the charity name floating in orbit.

Mohammad Zubair, owner of Galaxy Cars, stated:

We think this is a great opportunity to put something back into the community.

The new satellite is the latest edition to SSTL’s space portfolio and will join a team of six devices that are already in orbit, one of which has been going more than five years (Alsat-1).

When making our blog entries we are always on the "look out" for interesting and unusual satellite applications. Well, this week we have something "completely different"! Eagle Island, in the Chagos Archipelago, is overrun by rats! And it's all thanks to the human population that inhabited the island until 1935. Before that coconuts where farmed to provide oil, principally for lamps, but with electricity becoming widely available the economics of transporting the commodity from Eagle Island just didn't stack up. So the Island was left to return to nature - the problem was the rats stayed and truly made the island their home!

Now Eagle Island, at 5 x 0.5 km is the second largest in the archipelago after Diego Garcia and the only island in the Great Chagos Bank to be infested by the Black Rat (other rat-infested islands occur in other island groups of the archipelago, and Diego Garcia is also heavily infested). Our friends the rats are seemingly preventing the breeding of seabirds which on other islands within the group are prolific, providing some of the most valuable seabird breeding areas in the entire Indian Ocean despite the tiny sizes of these islands. The rats were also maintaining a less than desirable vegetation state by preventing the regeneration of indigenous species and by feeding on the eggs and hatchlings of nesting marine turtles. There are no land birds on the island, probably in large part due to the rat presence. Anyway, that's all changing now and we can measure this by using satellite imagery.

So how were the rats controlled? Firstly a baiting grid 30 x 30m was established across the entire island based on lines cut by hand through the dense vegetation by the eleven expedition members over a 6 week period during April this year. These provided an excellent opportunity to conduct a Rapid Assessment Survey of the state of the environment of the entire island surface using the resulting 2,844 grid points as recording stations. Ten parameters including the type of vegetation were recorded at each station by four expedition members. This data is now being mapped and together with other expedition results will be the subject of a "state of the environment" report later in the year.

Satellite imagery has been difficult to come by, not least because there is seemingly little of general interest to the world on tiny uninhabited islands in the middle of the Indian Ocean. As the result satellites are rarely focused - if at all - on the island, and any resulting images are almost unobtainable. The CHRIS images from the Surrey Space Centre will accurately compare images taken in April this year with those due to be taken in October. The CHRIS images will also high quality maps for conservation management purposes.

Results of the assessments will be used in assisting future management processes in this far-flung location, part of the British Indian Ocean Territory (BIOT), not least in monitoring the effects of the rat eradication and any other interventions to be made in future conservation.

So it's bad news for the rats but good news for the Island's environment and sea bird colonies.