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Investigation:

LC-15 (Saatchi / Alvala)

LBA Dataset ID:

LC15_ROUGHNESS_MAP

Originator(s):

1. SAATCHI, S.S.
2. RODRIGUEZ, E.
      3. DENNING, A.S.
4. DUBAYAH, R.O.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

The aerodynamic roughness length (Z0) is an important parameter to determine the vertical gradients of mean wind speed and the conditions for momentum transfer over a vegetated or bare rough surface. Over vegetated surfaces, the aerodynamic roughness length has a simple one-to-one relationship with the rms height of the vegetation at the top of the canopy. Once this roughness length is determined for a surface, it does not change with wind speed, stability or stress. During the LBA experiment the Regional Atmospheric Modeling System (RAMS) with flexible horizontal and vertical resolution will be used in conjunction with other models to simulate the atmospheric circulation and trace gas concentration and transport at various scales. This model is suitable to determine the effect of surface roughness parameter at trace gas transport both at local level for LBA study areas and on at the regional level for the entire Amazon basin. In this work we use two radar remote sensing data sets to estimate the vegetation roughness, independently and synergistically The Roughness length is estimated using an algorithm based on the integration of ground measurements of vegetation structure and several satellite imagery. Data sources such as the SRTM Elevation, Slope, variations, radar image textures, and land cover types are used in a fusion model to produce the vegetation roughness length. Among remote sensing data, SRTM (Shuttle Radar Topography Mission) provides the key measurement to estimate the rms height of the surface and the aerodynamic roughness.
In addition, various statistical moments of the JERS-1 image mosaic are used in the fusion algorithm along with other regional data sets to improve the measurements on the vegetation surface structure and thus the roughness length. Final estimates of aerodynamic roughness is provided in Z0 map at 1 km spatial resolution. The primary source of data for estimating the aerodynamic roughness length is the SRTM data acquired in 11 days in February, 2000.

Beginning Date:

2000-02-11

Ending Date:

2000-02-22

Metadata Last Updated on:

2013-08-28

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO LC-15 Aerodynamic Roughness Maps of Vegetation Canopies, Amazon Basin: 2000:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1182

Documentation/Other Supporting Documents:

LBA-ECO LC-15 Aerodynamic Roughness Maps of Vegetation Canopies, Amazon Basin: 2000:  http://daac.ornl.gov/LBA/guides/LC15_Roughness_Map.html

Citation Information - Other Details:

Saatchi,S., E. Rodriguez, S. Denning, R. Dubayah. 2013. LBA-ECO LC-15 Aerodynamic Roughness Maps of Vegetation Canopies, Amazon Basin: 2000. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA http://dx.doi.org/10.3334/ORNLDAAC/1182

Keywords - Theme:

Parameter Topic Term Source Sensor
CANOPY CHARACTERISTICS BIOSPHERE VEGETATION JERS-1 (JAPANESE EARTH RESOURCES SATELLITE-1) SAR (SYNTHETIC APERTURE RADAR)
CANOPY CHARACTERISTICS BIOSPHERE VEGETATION SPACE SHUTTLES SRTM (SHUTTLE RADAR TOPOGRAPHY MISSION)
VERTICAL WIND MOTION ATMOSPHERE ATMOSPHERIC WINDS COMPUTER MODEL ANALYSIS

Uncontrolled Theme Keyword(s):  AMAZON, BIOMASS, FOREST CANOPY, IMAGE ANALYSIS

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  AMAZON BASIN 13.85830 -23.42680 -47.02310 -82.72080

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