Earth Observation Coding Short Course - Introduction

Thanks for coming along to this EO coding shortcourse. Over the next couple of hours we would like you to have a go at executing the proceeding notebooks. They are split into two with the first covering the basics of visualising data from a file. The second example shows how to extract numerical data to plot on a time series which also shows how to generate statistics from an Earth Observation data file.

To work with the examples you will need some data files. The examples work for different data sources, the first being CODA https://coda.eumetsat.int/#/home and the second working with data from CMEMS https://marine.copernicus.eu/. Below is a video guide on getting data from CODA.

We also have a notebook in this set that guides you through selecting and downloading data from CMEMS.

Manually search for data sets on CODA

In this section we will describe the first of several options for downloading some OLCI data to use in the following notebooks.

EUMETSAT provides a browser interface for interactively searching for data from the Sentinel-3 satellites - the Copernicus Online Data Access (CODA). You can find CODA at this link. This is a useful approach to take if you want to have a quick look at the data before your download it, or if you aren't yet comfortable with using more programming based approaches to data access.

To download data, you will need an eoportal account. When you go to the CODA webpage, you will be prompted to sign in with your account details, or sign up (if you don't yet have an account).

You can use the various functionalities of CODA to search for data from a specific time and region, by satellite (Sentinel-3A or B), resolution (FR - full resolution of 300m, or RR, reduced resolution of 1km), timeliness of the product (NR - Near Real Time, available within 3 hours of sensing or NT - Non-time critical, available within 30 days, and including improved metadata for processing). The video linked below shows how CODA can be used for OLCI data.

For the CODA data based example in this module, we recommend downloading the following file S3A_OL_2_WFR____20210828T102423_20210828T102723_20210829T224705_0179_075_336_2160_MAR_O_NT_003

You can search for this file, by drawing a small box over the English channel selecting a sensing period including 2021-08-28, and then the correct product type, which in this case is "OL_2_WFR". Alternatively, the following link will download the file directly: https://coda.eumetsat.int/odata/v1/Products('aba47179-2504-40c3-a406-ba452d61844c')/$value

If this is your chosen option, you need to download this file and place it in an OLCI_data folder in a known location to use later.