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Record W2126573617 · doi:10.5589/m04-038

Uncertainties in latent heat flux measurement and estimation: implications for using a simplified approach with remote sensing data

2004· article· en· W2126573617 on OpenAlexvenueno aff
Le Jiang, Shafiqul Islam, Toby N. Carlson

Bibliographic record

VenueCanadian Journal of Remote Sensing · 2004
Typearticle
Languageen
FieldEnvironmental Science
TopicPlant Water Relations and Carbon Dynamics
Canadian institutionsnot available
Fundersnot available
KeywordsLatent heatEstimationFlux (metallurgy)Remote sensingEnvironmental scienceData miningGeographyEconometricsComputer scienceData scienceMathematicsMeteorologyEngineeringSystems engineering

Abstract

fetched live from OpenAlex

AbstractAccurate estimation of surface energy fluxes is essential for various hydrological, meteorological, agricultural, and ecological applications. Over the years, a wide variety of instrument systems and estimation methodologies have been developed to measure and estimate surface fluxes. Comparisons of various scale field experimental data and different model estimates show a large degree of scatter with a wide range of root mean square error. We explore and evaluate analytically the error property of the traditionally used energy balance residual method for latent heat flux estimation in an attempt to identify the possible existence of an irreducible error bound for latent heat flux measurement and estimation over large areas. Our analysis shows that the error is typically on the order of 10%–20% or larger for surface sensible and latent heat fluxes. A simplified remote sensing latent heat flux estimation approach is proposed and its error properties are evaluated. Results suggest that a similar or better error bound can be achieved using primarily remotely sensed data over large areas for the estimation of latent heat flux using this alternative approach.L'estimation précise des flux d'énergie de surface est essentielle pour diverses applications hydrologiques, météorologiques, agricoles et écologiques. Au cours des années, une grande variété de systèmes instrumentaux et de méthodologies d'estimation ont été développés pour mesurer et estimer les flux de surface. La comparaison des données expérimentales de terrain à diverses échelles et des différentes estimations dérivées des modèles montre une importante dispersion avec un large éventail au niveau de l'erreur quadratique moyenne. Nous explorons et évaluons analytiquement les propriétés d'erreur de la méthode du bilan énergétique résiduel traditionnellement utilisée pour l'estimation du flux de chaleur latente dans le but d'identifier l'existence possible d'une erreur limite irréductible dans la mesure et l'estimation du flux d'énergie latente sur des grandes étendues. Notre analyse montre que l'erreur est typiquement de l'ordre de 10%–20% ou plus pour les flux de chaleur sensible et latente. On propose une approche simplifiée d'estimation du flux de chaleur latente par télédétection et on évalue ses propriétés au plan des erreurs. Les résultats suggèrent que des erreurs limites similaires ou réduites peuvent être atteintes en utilisant principalement des données de télédétection pour des grandes étendues dans l'estimation du flux de chaleur latente à l'aide de cette approche alternative.[Traduit par la Rédaction]

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Simulation or modeling · Consensus signal: Simulation or modeling
GenreCandidate signal: Methods · Consensus signal: none
Teacher disagreement score0.229
Threshold uncertainty score0.985

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0010.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0000.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.057
GPT teacher head0.242
Teacher spread0.184 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one teacher head, not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designSimulation or modeling
Domainnot available
GenreMethods

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations67
Published2004
Admission routes1
Has abstractyes

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