On the relationship between ecosystem-scale hyperspectral reflectance and CO2 exchange in European mountain grasslands

On the relationship between ecosystem-scale hyperspectral reflectance and CO2 exchange in European mountain grasslands

Biogeosciences, 12, 3089-3108, 2015

Author(s): M. Balzarolo, L. Vescovo, A. Hammerle, D. Gianelle, D. Papale, E. Tomelleri, and G. Wohlfahrt

In this paper we explore the skill of hyperspectral reflectance measurements and vegetation indices (VIs) derived from these in estimating carbon dioxide (CO2) fluxes of grasslands. Hyperspectral reflectance data, CO2 fluxes and biophysical parameters were measured at three grassland sites located in European mountain regions using standardized protocols. The relationships between CO2 fluxes, ecophysiological variables, traditional VIs and VIs derived using all two-band combinations of wavelengths available from the whole hyperspectral data space were analysed. We found that VIs derived from hyperspectral data generally explained a large fraction of the variability in the investigated dependent variables but differed in their ability to estimate midday and daily average CO2 fluxes and various derived ecophysiological parameters. Relationships between VIs and CO2 fluxes and ecophysiological parameters were site-specific, likely due to differences in soils, vegetation parameters and environmental conditions. Chlorophyll and water-content-related VIs explained the largest fraction of variability in most of the dependent variables. Band selection based on a combination of a genetic algorithm with random forests (GA–rF) confirmed that it is difficult to select a universal band region suitable across the investigated ecosystems. Our findings have major implications for upscaling terrestrial CO2 fluxes to larger regions and for remote- and proximal-sensing sampling and analysis strategies and call for more cross-site synthesis studies linking ground-based spectral reflectance with ecosystem-scale CO2 fluxes.

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Hot Dog Joint Opening In Old Las Brasas Space on East Howard

May 26, 2015 at 03:29PM
source: Decatur Metro, http://ift.tt/1AwfD7F

Creative Loafing is reporting that the owner of the Doggy Dogg hot dog carts – often seen at farmer’s markets around Atlanta –  is opening a brick-and-mortar location in Decatur soon.  And indeed a post on their Facebook page seems to prove it.  Here are some of the CL-provided details… Hammerl tells Creative Loafing that after touring Atlanta with […]

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Doggy Dogg Coming to old Las Brasas Spot

May 26, 2015 at 02:17PM
source: Next Stop…Decatur, http://ift.tt/1FNmgCZ

From: http://ift.tt/1EvBMy0
James Hammerl is in the dogg house, or, at least he’s ‘bout to be. The proprietor of the popular Doggy Dogg weiner carts has a brick-and-mortar hot dog joint in the works.

Hammerl tells CL that after touring Atlanta with his decked out wiener carts for the last four years, he is planning to open the first-ever stationary Doggy Dogg outpost in the former home of shuttered Peruvian chicken rotisserie Las Brasas (310 E. Howard Ave.) in Decatur. (Las Brasas, is in the process of relocating to 614 Church St. and hopes to open in July.) Meanwhile, Hammerl’s hot dog carts will continue to make their farmers market appearances.

Doggy Dogg’s ingredients are preservative free and sourced locally (most sausages are from the Spotted Trotter). Buns come from Holeman and Finch, including a gluten-free option. Hammerl plans to serve ten or so items such has the signature Doxie, a dog topped with with sauerkraut and a dark-ale German mustard, and the Saigon Slinger with hot pickled vegetables and cilantro mayo.

Doggy Dogg will have take-away lunch six days a week and dinner every night. The late night window will be open Fridays and Saturdays. Projected opening is June. Look for a pretty cool mural by Kyle Brooks (Black Cat Tips) to grace the bright white sides of the building. More information as it becomes available can be found at www.doggydoggatl.com.

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