The Level 2 FDI wind-speed data has been updated to include measurements at high and low latitudes.
The processing remains FDI V1.11.
Originally a filter of 55 degree latitude was used to be sure that sea ice was excluded from the retrieval. The new approach filters using a sea-ice map so that our measurements continue closer to the Arctic and Antarctic.
Below are the availability of L2 wind-speed product,
With new sea ice filter:
Original sea ice filter by latitude:
We are updating the MERRByS service with two significant changes:
- More data, lots more: From March 2016 to July 2017
- Level1B and Level 2 (FDI windspeed)
- New data format (NetCDF)
The new data format moves on from the XML / Tiff format that was used on the last release (Level 1B version 0.5). The new format is NetCDF and provides many advantages for distribution and processing. There is an updated Product Manual in Documentation.
To make it easier to get started with this new format, example code is provided in Matlab at: https://github.com/pjalesSSTL/GNSSR_MERRByS
All the old data will still be available on the FTP server at /DataV0p5 for the time-being.
On the 10th of July TechDemoSat-1 comes to the end of its mission. It was launched on the 8th July 2014 for a three year mission and has been a huge success. For those that aren’t aware , TDS-1 was built on a very tight schedule with an incredibly low budget. TDS-1 was built in around 2.5 years and in that time supported between 8-11 different payloads from industry (often changing!) at any one point.
After all that , TDS continues to operate in Orbit. It should also be noted that TDS had only a heritage primary string and relied entirely on SSTL’s new developments and innovations for its redundancy as well as in some key primary roles.
As of the 10th July 2017, all payload and SSTL PD operations will be ceasing now as the mission ends after its 3 year life and the craft will be placed ‘on ice’ in Orbit. During this time, nothing will run on the craft and it will just be monitored by the SSTL Ops teams and kept safe whilst arrangements are made for either the de-orbit or repurpose of the craft. At this point SSTL will NOT yet be deploying the de-orbit sail as there is possibility that if funding can be secured the craft may be used further.
The flight of our SGR-ReSI has proven a new remote sensing technique, GNSS Reflectometry which is able to measure winds over the ocean to around 2 m/s, as well as sensing ice and land reflections. This experiment also has enabled the NASA CYGNSS mission – right now there are eight 25 kg microsatellites orbiting the Earth each with SSTL’s SGR-ReSI and waiting for the next hurricane to measure. TDS-1 has firmly established GNSS-R as a new earth observation technique.
We are aware of 27 journal papers that are using TDS-1 GNSS-R data. There are certainly more on the way.
We are currently looking for ways of extending the TDS-1 mission to allow further operations of the SGR-ReSI, to continue providing data on MERRByS, developing a sea state / weather monitoring service and with a view to flying more such instruments.
Level 1B and Level 2B Datasets from 6th March 2015 to 20th April 2016, v0.5
This is the first release of operations in Programmable Gain Mode.
Level 1B Release v0.5 Up to 18th April 2015
See change log in MERRByS Product Manual
Level 2 FDI Winds, Release v1.11
Up to 18th April 2015, v0.5
Last datasets operating in Automatic Gain Mode
Preliminary release of L1B and L2 Data up to end Feb 2015