K
Karl F. Huemmrich
Researcher at University of Maryland, Baltimore County
Publications - 70
Citations - 6718
Karl F. Huemmrich is an academic researcher from University of Maryland, Baltimore County. The author has contributed to research in topics: Photochemical Reflectance Index & Normalized Difference Vegetation Index. The author has an hindex of 30, co-authored 67 publications receiving 6000 citations. Previous affiliations of Karl F. Huemmrich include Goddard Space Flight Center & University of Baltimore.
Papers
More filters
Journal ArticleDOI
A Landsat surface reflectance dataset for North America, 1990-2000
Jeffrey G. Masek,Eric Vermote,Nazmi Saleous,Robert E. Wolfe,Forrest G. Hall,Karl F. Huemmrich,Feng Gao,J. Kutler,Teng-Kui Lim +8 more
TL;DR: Initial comparisons with ground-based optical thickness measurements and simultaneously acquired MODIS imagery indicate comparable uncertainty in Landsat surface reflectance compared to the standard MODIS reflectance product.
Journal ArticleDOI
Global monitoring of terrestrial chlorophyll fluorescence from moderate-spectral-resolution near-infrared satellite measurements: methodology, simulations, and application to GOME-2
Joanna Joiner,Luis Guanter,Rasmus Lindstrot,Maximilian Voigt,Alexander Vasilkov,Elizabeth M. Middleton,Karl F. Huemmrich,Yasuko Yoshida,Christian Frankenberg +8 more
TL;DR: In this article, the spectral signatures of three basic components: atmospheric absorption, surface reflectance, and fluorescence radiance are disentangled using a principal component analysis (PCA) approach.
Journal ArticleDOI
Vegetation canopy PAR absorptance and the normalized difference vegetation index: an assessment using the SAIL model.
TL;DR: In this paper, the relationship between the normalized difference vegetation index (NDVI) and absorbed photosynthetically active radiation (APAR) in a vegetation canopy was studied and the results indicated that instantaneous observations can be used to characterize the diurnally integrated APAR in vegetation canopies.
Journal ArticleDOI
Satellite remote sensing of surface energy balance : success, failures, and unresolved issues in FIFE
TL;DR: In this article, an agreement was achieved between helicopter and satellite measures of surface reflectance to within +/- 1 percent absolute for both the visible and the NIR bands, which translates into a +/- 10 percent error in the estimation in Fpar.
Journal ArticleDOI
MODIS leaf area index products: from validation to algorithm improvement
Wenze Yang,Bin Tan,Dong Huang,Miina Rautiainen,N.V. Shabanov,Yulei Wang,Jeffrey L. Privette,Karl F. Huemmrich,Rasmus Fensholt,Inge Sandholt,Marie Weiss,Douglas E. Ahl,Stith T. Gower,Ramakrishna R. Nemani,Yuri Knyazikhin,Ranga B. Myneni +15 more
TL;DR: This paper summarizes the experience of several collaborating investigators on validation of MODIS LAI products and suggests three key factors that influence the accuracy of LAI retrievals that are suggested from the model used to build the look-up tables accompanying the algorithm.