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POLinSAR 2019

28 January - 1 February 2019

The European Space Agency is organising POLinSAR 2019, the 9th International Workshop on Science and Applications of SAR Polarimetry and Polarimetric Interferometry, to be hosted in ESRIN, Frascati, Italy from 28 January to 01 February 2019.

The objectives of this workshop are to:

  • Provide a forum for scientific exchange
  • Present the latest exploitation results from full-pol airborne and spaceborne systems and assess the state-of-the-art
  • Review retrieved bio-geophysical parameters and their accuracy
  • Make recommendations for algorithm development and new products
  • Support the preparation for ESA and Third Parties full-pol missions exploitation (BIOMASS, NOVASAR-S, RCM, SAOCOM, TerraSAR-L etc.)
  • Present innovative polarimetric applications and ideas for future polarimetric mission concepts
  • Report on the status of POLinSAR 2017 recommendations.


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ATMOS 2018

26 - 29 November 2018

In the context of the EO Science for Society Programme Element, the European Space Agency is organising ATMOS 2018, a conference on the topical theme Atmosphere aimed at exploiting data from ESA and EO Missions for science and application development.

The purpose of this conference is to provide scientists and data users with the opportunity to present first-hand and up-to-date results from their ongoing research and application development activities by using data from past and current atmospheric instruments like Sentinel-5P, Aeolus, ERS-2, Envisat, Metop, and ESA Third Party Missions. Another aspect will be on discussing activities regarding future missions.

The conference will be held in Salzburg (Austria) from 26 to 29 November 2018. The outcome of this conference will help to further shape the next generation of R&D activities in the frame of ESA's Earth Observation Programme.


Registration deadline extended: 21 November 2018


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California Fires

15 November 2018 - This week's image comparisons use Copernicus Sentinel-2 imagery to show the large fires that have spread through Malibu, Sacramento and Thousand Oaks, California.

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Niagara Falls

12 November 2018 - The Niagara Falls are the focal point of this Landsat image comparison, which show the falls in 1992 and in 2017.

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Back to Daily Performance Reports

The following performance reports are available:


Back to Daily Performance Reports

The following performance reports are available:


AIS / Spire Sense

All large ocean-going vessels and passenger vessels are required by the International Maritime Organization to install an AIS transponder and broadcast information about their location and other particulars. Spire captures and decrypts the vessel transponder signal from its satellite constellation as well as land-based receivers. The data is cleaned, attached to specific vessel identifiers, and combined with other vessel-specific information to create a global database of ocean-going vessels that is updated on 15-minute intervals and enhanced through AI software. 

               

ADS-B / Spire AirSafe

Commercial, military, business, and personal aircraft are facing new regulations that require the installation of ADS-B transponders by 2020. Most commercial and business jets are already equipped and regularly send information about their location and speed that Spire captures from its satellite constellation. Spire is at the forefront of space-based ADS-B collection and can track over the oceans, poles, and remote areas where ground-based receivers cannot be installed.

GNSS-RO / Spire Stratos

GNSS-RO is a technique that provides unique temperature, pressure, and moisture vertical soundings through the atmosphere, similar to the type of data collected by a weather balloon. Rather than data being available only twice per day from specific sites, GNSS-RO utilizes Spire's satellite constellation to collect soundings 24/7 on a global basis and over remote regions like the oceans and the poles. In addition to being an important input for weather forecasting, GNSS-RO is also a climate quality measurement. 

GNSS-RO data is output using the BUFR format convention. BUFR files are a binary data format that include bending angle, refractivity, and dry temperature as a function of altitude during a radio occultation event. The three sets of profile information (bending angle, refractivity, and dry temperature) represent increasing levels of Spire processing of the excess phase measurements recorded by the CubeSat GNSS receiver. BUFR files are commonly used by the World Meteorological Organization (WMO) for ingestion into Numerical Weather Prediction (NWP) models for data assimilation, and radio occultation is one of several remote sensing datasets that can be converted into BUFR files to describe meteorological data. The BUFR files produced by Spire comply with the BUFR files produced by the COSMIC Data Analysis and Archive Center (CDAAC) for COSMIC radio occultation data products.

              

Total Electron Content

When the GNSS receiver on-board a Spire satellite is powered on, it continuously tracks multiple dual-frequency GNSS satellite signals simultaneously from the POD antenna. These signals are primarily used for the purpose of precise orbit determination, which is necessary for neutral atmospheric radio occultation inversion. However, the pseudorange and carrier phase measurements measured by the receiver are also used to derive an estimate of the ionospheric total electron content (TEC) along the line-of-sight to each GNSS satellite. During post-processing, the TEC is computed for each signal "arc" (i.e. the period when the Spire receiver is continuously tracking a particular GNSS satellite) by forming a linear combination of phase measurements from dual GNSS frequencies. The phase TEC measurements are then "leveled" to the analogous combination of the pseudorange measurements for a more accurate measurement. Receiver and transmitter differential code biases are removed when possible. 

The computed TEC values are stored in standard NetCDF format along with ancillary information including the transmitter and receiver positions. These data sets are packed in a NetCDF format, following conventions derived from data products created by CDAAC.

 

Ionospheric Scintillation Indices

Scintillation indices are indicators for ionospheric turbulence and are subdivided into two classifications: amplitude scintillation (S4), and phase scintillation (σɸ). Both provide indicators for "space weather" in the upper atmosphere. For example, large S4 values from a GNSS link may indicate ionospheric "storms" consisting of electron density gradients (e.g., Equatorial Spread F). This could lead to loss-of-lock on GNSS receivers, jeopardizing a receiver's ability to provide robust and accurate Position, Navigation, and Timing (PNT). Continuous monitoring of scintillation indices is key for understanding GNSS link health, and is a first step toward predicting potential GNSS regional outages.

Spire's CubeSats feature an advanced scintillation monitoring capability and can measure both amplitude and phase scintillation (S4 and σɸ). Combined with both a large constellation (~100 CubeSats) and diverse orbital planes, Spire's constellation is prepared to contribute critical ionospheric data, particularly over Equatorial regions. 

These data sets are packed in a NetCDF format, following conventions derived from data products created by CDAAC.

 

Magnetometer Data

Magnetometer data is collected continuously on Spire spacecraft as part of our Attitude Control and Determination (ADCS) system. The sensor used is based on magneto-inductive technology to deliver high-performance resolution and repeatability with high gain, high sample rates, low hysteresis, and no need for temperature calibration.

Spire can provide the magnetic field vector (x, y, z + unix timestamp) Unit: nT.  The time resolutions is 4 Hz or 0.1 Hz.