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Deriving leaf area index reference maps using temporally continuous in situ data: A comparison of upscaling approaches

Deriving leaf area index reference maps using temporally continuous in situ data: A comparison of upscaling approaches
Deriving leaf area index reference maps using temporally continuous in situ data: A comparison of upscaling approaches
To further progress the validation of global leaf area index (LAI) products, temporally continuous reference data are a key requirement, as periodic field campaigns fail to adequately characterize temporal dynamics. Progress in cost-effective automated measurement techniques has been made in recent years, but appropriate upscaling methodologies are less mature. Recently, the use of multitemporal transfer functions has been proposed as a potential solution. Using data collected during an independent field campaign, we evaluated the performance of both vegetation index-based multitemporal transfer functions and a radiative transfer model (RTM)-based upscaling approach. Whether assessed using cross validation or data from the independent field campaign, the RTM-based approach provided the best performance ( r 2 ≥ 0.88, RMSE ≤ 0.41, NRMSE < 13%). For upscaling temporally continuous in situ data, the ability of RTM-based approaches to account for seasonal changes in sun-sensor geometry is a key advantage over vegetation index-based multitemporal transfer functions.
Digital hemispherical photography (DHP), INFORM, LAI, Sentinel-2, validation, vegetation indices
1939-1404
624-630
Brown, Luke
6a693f08-df9e-4494-bb89-8d2897470d4a
Ogutu, Booker
4e36f1d2-f417-4274-8f9c-4470d4808746
Camacho, Fernando
76d2e230-c016-4bb1-9e2c-88b4e5885c25
Fuster, Beatriz
1972c6f5-ca6a-4fce-ae57-4cf42acb14ae
Dash, Jadunandan
51468afb-3d56-4d3a-aace-736b63e9fac8
Brown, Luke
6a693f08-df9e-4494-bb89-8d2897470d4a
Ogutu, Booker
4e36f1d2-f417-4274-8f9c-4470d4808746
Camacho, Fernando
76d2e230-c016-4bb1-9e2c-88b4e5885c25
Fuster, Beatriz
1972c6f5-ca6a-4fce-ae57-4cf42acb14ae
Dash, Jadunandan
51468afb-3d56-4d3a-aace-736b63e9fac8

Brown, Luke, Ogutu, Booker, Camacho, Fernando, Fuster, Beatriz and Dash, Jadunandan (2021) Deriving leaf area index reference maps using temporally continuous in situ data: A comparison of upscaling approaches. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 14, 624-630, [9268082]. (doi:10.1109/JSTARS.2020.3040080).

Record type: Article

Abstract

To further progress the validation of global leaf area index (LAI) products, temporally continuous reference data are a key requirement, as periodic field campaigns fail to adequately characterize temporal dynamics. Progress in cost-effective automated measurement techniques has been made in recent years, but appropriate upscaling methodologies are less mature. Recently, the use of multitemporal transfer functions has been proposed as a potential solution. Using data collected during an independent field campaign, we evaluated the performance of both vegetation index-based multitemporal transfer functions and a radiative transfer model (RTM)-based upscaling approach. Whether assessed using cross validation or data from the independent field campaign, the RTM-based approach provided the best performance ( r 2 ≥ 0.88, RMSE ≤ 0.41, NRMSE < 13%). For upscaling temporally continuous in situ data, the ability of RTM-based approaches to account for seasonal changes in sun-sensor geometry is a key advantage over vegetation index-based multitemporal transfer functions.

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JSTARS3040080 - Version of Record
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More information

Accepted/In Press date: 18 November 2020
e-pub ahead of print date: 24 November 2020
Published date: 6 January 2021
Keywords: Digital hemispherical photography (DHP), INFORM, LAI, Sentinel-2, validation, vegetation indices

Identifiers

Local EPrints ID: 446344
URI: http://eprints.soton.ac.uk/id/eprint/446344
ISSN: 1939-1404
PURE UUID: 971cc7e5-98b4-4b81-8c4b-eaba79f291f3
ORCID for Luke Brown: ORCID iD orcid.org/0000-0003-4807-9056
ORCID for Booker Ogutu: ORCID iD orcid.org/0000-0002-1804-6205
ORCID for Jadunandan Dash: ORCID iD orcid.org/0000-0002-5444-2109

Catalogue record

Date deposited: 05 Feb 2021 17:30
Last modified: 26 Nov 2021 03:07

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Contributors

Author: Luke Brown ORCID iD
Author: Booker Ogutu ORCID iD
Author: Fernando Camacho
Author: Beatriz Fuster
Author: Jadunandan Dash ORCID iD

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