## Data Cubes For Water Quality

Tiago A. M. Silva , Veronique Creach, Cherry Jones, Kate Collingridge, Tiago Santos, Mark Baldry http://dcs4cop.eu

## Data Cubes For Water Quality

1. What is a data cube
2. Examples of datacubes at Cefas
http://dcs4cop.eu

## What Is A Data Cube?

A data repository on a shared grid
Each variable is N-dimensional
Operators can be applied in any dimension 
just a as easily
Average('time'), Average('latitude'), etc

## Principles Of The Data Cube Manifesto

1. Gridded data with N dimensions
2. All axes have equal treatment
3. Efficient trimming and slicing in one request
https://earthserver.eu/tech/datacube-manifesto/

4. Similar performance across axes
5. …partitioning (chunks) 6. Language that allows composite extraction, processing, filtering and fusion

## Motivation

Keep up with data size growth. 
Progressively harder for users to download and process 
locally
Make the most of the data 
Make it accessible *and* usable by providing the tools
Reproducibility
fragmented workflow makes science impractical to 
reproduce
multiple software tools and environments
2017 Nobel Prize for Physics

## Could You Benefit From Using A Data Cube? Data Cube Service Data Cube Service

One dataset, several users

## Data Cube Service

One dataset, **many** users for different use cases Baumann et al., 1997, 2016

## Data Cube Usages In The Marine Domain

Intertidal cycle, coastline change Deal with clouds, missing data: cloud-free mosaics, robust statistics
Area statistics: environmental assessments
Temporal classification: water types, river plumes
Explore multiple algorithms on-the-fly:
Multiband indexes, fitted inversions
Combine multiple satellite sensors

observations -
Vary in time, space, and uncertainty Combine them to increase accuracy

## Water Quality Data Cubes At Cefas

I.
MSFD Eutrophication Assessment
II.
WFD Eutrophication Risk
III. Marine Discharge Plumes

## I . Msfd Eutrophication Assessment

Chlorophyll observations
EUNOSAT coherent algorithm
CMEMS standard
COMP4 Assessment Areas
SmartBuoy locations

## Ii . Wfd Eutrophication Risk Sentinel-2 (10 M) Suspended

Particulate Matter/Turbidity
Multiple bands and algorithms

## Wfd Water Bodies Ea Water Quality Data Archive

*Aim is to integrate with* in-situ

## Iii . Marine Discharge Plumes

High Resolution Sea Surface 
Temperature (100 m)
Atmospheric correction
Power station Intakes and outfalls
Protected Areas
Automatic detection of plume *In situ* SST

## Thank You For Your Attention

tiago.silva@cefas.co.uk Together we are working for a sustainable blue future