Newsletter 1 June 2014

Newsletter 1, spring 2014 banner
Welcome!

Dear reader,

You are receiving this newsletter because we thought you might be interested in our EU FP7 project GLaSS: Global Lakes Sentinel Services.
Within GLaSS, we are preparing for the uptake of the new ESA satellites Sentinel-2 and Sentinel-3. The prospect is that the combination of the high resolution of Sentinel-2 combined with the frequent acquisition and the spectral band settings of Sentinel-3 will lead to great improvements for water quality monitoring. 

To make the best use of the data of these satellites, GLaSS is setting up a system and harmonising methods to acquire the data of global lakes, process them into water qualtiy maps, and make them available via user-friendly use cases and teaching material. If you want to read more about the content of the project, check out our website. We are also on twitter (@glass_project)!

Hope you enjoy our updates!

The GLaSS team
(If you are not interested, please read the last lines to unsubscribe for this newsletter)

Project meeting at Tartu Observatory


A project meeting was held at Tartu Observatory, Estonia, from 3 to 4 April 2014. The meeting was organized together with the WaterS project. About 30 participants from 9 countries attended the joint meeting. There was a full day reseved for scientific discussions on the first results of atmospheric correction harmonisation, optical pre-classification and constituents-retrievel algorithms. Great to have such a large community of remote sensing specialists working on inland waters together!

Initial test data: simulated Sentinel-2 and -3 data
 

GLaSS prepared simulated Sentinel-2 and Sentinel-3 OLCI data products to test the GLaSS system and our algorithms before real Sentinel 2 and 3 data is available.
Three types of datasets were prepared: 
  1) S2 and S3 datasets simulated from Landsat and MERIS scenes 
  2) Water leaving reflectance spectra measured with in situ devices and converted to S2 and S3 bands 
  3) S2 datasets simulated from airborne data  
 
Atmospheric correction harmonisation

Recently, our report on atmospheric correction was finished. One part of this report is dedicated to compare the setup of the available algorithms: which algorithms can easily be adjusted to Sentinel-2 and -3 (OLCI)? Which require additional software, or special knowledge on the aerosol properties at the time of acquisition? The second part of the report consist of application of the available algorithms to different lakes, where we compare the results at water level with in situ measured reflectance.
 
Planned field campaigns for summer 2014

With so many lakes with so many optical properties, ranging from blue to green and brown, GLaSS prepares to do fieldwork in a large variety of lakes. As much as possible we try to join each others fieldwork trips, to generate inter-comparisons of radiometers and laboratory methods. The plans for 2014 are:
  • Several Finnish lakes (SYKE)
  • Several Estonian lakes (Tartu Observatory)
  • Lake Garda 9/10 June (CNR)
If you are interested to join us, or if you organise a field campaign that GLaSS can join, just contact us!