Introduction

In the recent years, significant efforts have been made to promote and develop lunar calibration activities within GSICS and CEOS WGCV IVOS. In December 2014 experts from 14 agencies and departments attended the joint GSICS – IVOS Lunar Calibration Workshop organized by EUMETSAT in collaboration with USGS, CNES and NASA. In total it represented potentially more than 25 instruments capable of observing the Moon, covering a spectral range from about 0.4μm to 2.3μm. One of the major achievements of the workshop was to work on a common lunar irradiance model: the GSICS Implementation of the ROLO (GIRO) model. The GIRO was endorsed as the established publicly-available reference for lunar calibration, directly traceable to the USGS ROLO model.

More recently, many initiatives were undertaken by the members of the Lunar Calibration Community with for instance dedicated lunar measurement campaigns, developments of radiance models, or new algorithms to develop new lunar inter-calibration products.

In order to pursue the efforts of sharing knowledge and expertise on lunar calibration, the Second Joint GSICS/IVOS Lunar Calibration Workshop will be hosted by the China Meteorological Administration (CMA) in Xi’an, China, November 13-16, 2017.

This workshop is being organized by CMA, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), EUMETSAT, USGS and NOAA.

The main objectives of the workshop are:

  1. To share knowledge and expertise on the latest dedicated ground-based lunar observation campaigns, and also space-based lunar datasets, that can help with refining the current lunar calibration reference.
  2. To share knowledge and expertise in the preparation of lunar irradiance measurements from observations by the instruments to be monitored.
  3. To work jointly on algorithms to compare and inter-calibrate instruments with lunar observation capabilities, even from different eras, supporting the generation of Fundamental Climate Data Records.
  4. To explore further alternative applications of lunar observations for calibration purposes or post-launch assessments, such as geometric and MTF characterization.

This workshop will lead to an updated assessment of the current lunar observation dataset that can either support refining the accuracy of the current version of the ROLO/GIRO or be part of the GSICS Lunar Observation Dataset (GLOD). It will also contribute to defining recommendations or methodologies to compare and inter-calibrate instruments using the Moon. Finally it is intending to provide more insight on the use of lunar observations in satellite mission Cal/Val plans and for sensor monitoring activities.

A series of preparatory activities is currently being defined for which participants are expected to present their results for discussion at the workshop. A list of topics is available on the GSICS Development Wiki topic dedicated to the 2017 Lunar Calibration Workshop (details here). Presentations about the latest progress on lunar measurements and Moon observations, using the ROLO/GIRO, inter-calibration using the Moon and alternative lunar methods and applications are also welcome. The workshop aims at triggering activities to enhance the current lunar calibration capabilities, while strengthening further the interactions between the members of the Lunar Calibration Community.

Two web meetings were organized in order to define the topics that will be covered by the workshop. All information and documentation regarding the preparation of the workshop, together with the contact details of the organizers can be found under the GSICS Lunar Calibration wiki topic (details here). Additional web meetings will be organized in preparation of the workshop. Announcements will be made through the GSICS Developers mailing list.

Deadline of registration for VISA application online is August 31st, 2017.

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