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Dataset

 

EOCIS: Lake Catchment Change Indicators V1.0

Update Frequency: Not Planned
Latest Data Update: 2025-04-05
Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2025-04-04
DOI Publication Date: 2025-04-04
Download Stats: last 12 months
Dataset Size: 18.98K Files | 143GB
Abstract

This dataset contains Lake Catchment Change Indicators data produced within the Earth Observation Climate Information Service (EOCIS) project by Plymouth Marine Laboratory.

The Product(s) can be used to map daily variations in the reflectance of water bodies contained in the target lake catchment. The derived quantities turbidity and chlorophyll-a can be used to determine variability in the optical and biochemical conditions of the lake and other included water bodies.

A set of vegetation, built-up area, and water indices are included to aid users in selection data ranges and locations of interest. These include the Normalized Difference Vegetation Index (NDVI), Normalized Difference Built-Up Index (NDBI) Augmented Normalized Difference Water Index (ANDWI) and Modified Normalized Difference Water Index (MDNWI).

These data sets have been created following the specific format for climate data at high resolution for the UK (CHUK) within the EOCIS project. The CHUK grid consists of 100m x 100m cells in British National Grid (BNG) projection. The CHUK grid covers the whole area of the British Isles, an area approximately 1,000km x 1,500km, whereas the data sets presented here are limited to parts of this grid for the extent of each lake catchment.

Citable as:  Simis, S.; Warren, M.; Selmes, N.; Liu, X. (2025): EOCIS: Lake Catchment Change Indicators V1.0. NERC EDS Centre for Environmental Data Analysis, 04 April 2025. doi:10.5285/6e329e32570d4d4f818b8f8aa18e7a85. https://dx.doi.org/10.5285/6e329e32570d4d4f818b8f8aa18e7a85
Cite this dataset

Abbreviation: Not defined
Keywords: lake catchment, turbidity, chlorophyll, NDVI, NDBI, ANDWI, MDNWI, water-leaving reflectance, CHUK, EOCIS

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence(s):
http://creativecommons.org/licenses/by/4.0/
When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

This dataset was produced by Plymouth Marine Laboratory in the context of the Earth Observation Climate Information Service project.
Data Quality:
Algorithms used to derive water quality variables from atmospherically corrected Sentinel-2 MSI imagery are described in Warren et al. (2021). The described procedure align the products derived from Sentinel-2 MSI with corresponding imagery obtained by Sentinel-3 OLCI. However, application to (very) small bodies of water is likely to see degradation of product quality. The data contained in this record have not been quality masked although several product quality flag sets are included. These data are intended for expert use. They will require additional quality masking, taking into account the challenges of observing water quality over (very) small bodies of water. References Warren et al. 2021, https://doi.org/10.1016/j.rse.2021.112651
File Format:
NetCDF

Related Documents

 Warren, M. A., Simis, S. G., & Selmes, N. (2021). Complementary water quality observations from high and medium resolution Sentinel sensors by aligning chlorophyll-a and turbidity algorithms. Remote Sensing of Environment, 265, 112651.
 Quick Start Guide

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Computation Element: 1

Title Calimnos
Abstract Calimnos is a multi-sensor satellite processing chain developed at Plymouth Marine Laboratory to observe lakes and other isolated waterbodies. It is built around per-pixel dynamic algorithm selection and blending to accommodate the wide optical diversity of lakes. Processor versions >= 2 include per-pixel product uncertainty for key variables. Calimnos calls several external libraries including modules for pixel identification (SNAP Idepix) and atmospheric correction using Polymer by Hygeos.
Input Description None
Output Description None
Software Reference None
Output Description

None
  • var_id: ANDWI
  • units: mg.m-3
  • var_id: chla_top_2_weighted
  • standard_name: mass_concentration_of_chlorophyll_a_in_water_body
  • long_name: Concentration of chlorophyll-a derived with Calimnos optical water type weighted blending of chlorophyll-a algorithms
  • units: 1
  • var_id: Rw1375
  • standard_name: fully_normalized_water_leaving_reflectance_at_1375nm
  • long_name: Fully normalized water-leaving reflectance at 1375 nm
  • units: 1
  • var_id: Rw1610
  • standard_name: fully_normalized_water_leaving_reflectance_at_1610nm
  • long_name: Fully normalized water-leaving reflectance at 1610 nm
  • units: 1
  • var_id: Rw2190
  • standard_name: fully_normalized_water_leaving_reflectance_at_2190nm
  • long_name: Fully normalized water-leaving reflectance at 2190 nm
  • units: 1
  • long_name: Fully normalized water-leaving reflectance at 443 nm
  • var_id: Rw443
  • standard_name: fully_normalized_water_leaving_reflectance_at_443nm
  • units: 1
  • long_name: Fully normalized water-leaving reflectance at 490 nm
  • var_id: Rw490
  • standard_name: fully_normalized_water_leaving_reflectance_at_490nm
  • units: 1
  • long_name: Fully normalized water-leaving reflectance at 560 nm
  • var_id: Rw560
  • standard_name: fully_normalized_water_leaving_reflectance_at_560nm
  • units: 1
  • long_name: Fully normalized water-leaving reflectance at 665 nm
  • var_id: Rw665
  • standard_name: fully_normalized_water_leaving_reflectance_at_665nm
  • units: 1
  • var_id: Rw705
  • standard_name: fully_normalized_water_leaving_reflectance_at_705nm
  • long_name: Fully normalized water-leaving reflectance at 705 nm
  • units: 1
  • var_id: Rw740
  • standard_name: fully_normalized_water_leaving_reflectance_at_740nm
  • long_name: Fully normalized water-leaving reflectance at 740 nm
  • units: 1
  • var_id: Rw783
  • standard_name: fully_normalized_water_leaving_reflectance_at_783nm
  • long_name: Fully normalized water-leaving reflectance at 783 nm
  • units: 1
  • var_id: Rw842
  • standard_name: fully_normalized_water_leaving_reflectance_at_842nm
  • long_name: Fully normalized water-leaving reflectance at 842 nm
  • units: 1
  • var_id: Rw865
  • standard_name: fully_normalized_water_leaving_reflectance_at_865nm
  • long_name: Fully normalized water-leaving reflectance at 865 nm
  • units: 1
  • var_id: Rw945
  • standard_name: fully_normalized_water_leaving_reflectance_at_945nm
  • long_name: Fully normalized water-leaving reflectance at 945 nm
  • var_id: MNDWI
  • var_id: NDBI
  • var_id: NDVI
  • units: 1
  • standard_name: turbidity_in_water_body_mean_within_aggregation_period
  • var_id: turbidity
  • long_name: Turbidity in Nephelometric Turbidity Units derived with Calimnos optical water type weighted blending of total suspended matter algorithms
  • var_id: VH
  • var_id: VV
  • var_id: crsOSGB
  • var_id: spatial_ref
  • var_id: time
  • units: days
  • var_id: water
  • var_id: x
  • standard_name: projection_x_coordinate
  • long_name: x coordinate of projection
  • units: metre
  • var_id: y
  • standard_name: projection_y_coordinate
  • long_name: y coordinate of projection
  • units: metre

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: lat
  • units: degrees_east
  • standard_name: longitude
  • var_id: lon
Coverage
Temporal Range
Start time:
2016-01-01T00:00:00
End time:
2023-12-31T00:00:00
Geographic Extent

 
60.7149°
  
-15.3725°
  
3.0246°
 
47.3957°
  
Related parties
Authors (4)
Publishers (1)
Funders (1)
Principal Investigators (1)