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Unformatted text preview: - Variable circular plot method: sparsely distributed large diameter trees sampled with same intensity as denser small diameter trees, probability of tree selection is proportional to the basal area (BAF) with a radius (r v ) of a fixed angle ( g ) plot depending on the DBH (Equations 3, 4) 1 Abstract A series of papers written, or co-written, by Marc Simard* of NASAs Jet Propulsion Laboratory, Pasadena, California , 91109, covering Mangrove Forests and the mapping and remote sensing techniques used to estimate the above ground biomass and mean tree height spatial distributions of these biomes are discussed. Three locations were considered in this series of papers; Mozambique, Cienaga Grande de Santa Maria (CGSM), Colombia and the Florida Everglades (ENP). Multiple characteristics of these biomes were considered for their study; their location simplifies the calibration of radar data, low species diversity enables the utilization of numerous allometric equations in field calculations, and mass global deforestation by anthropogenic and natural impacts make it possible to monitor the advance and retreat of these areas. The economic and biogeochemical importance of these forest make a methodology quantifying their structure and biomass on a large scale imperative. An overview is provided of how Shuttle Radar Topography Mission (SRTM) data combined with calibration techniques using field data and LiDAR (Light Detection and Ranging) systems make it possible to now accurately monitor the retreat and restoration of mangrove forests on a large scale. This compellation should provide a basic comprehension of remote sensing technologies, techniques and processes covered in the referenced papers, and the ecological importance of large-scale monitoring of mangrove forests. Methodology-Field data: site specific vegetation sturcture information required for calibration and validation of remotely sensed parameters-Field parameters: DBH, species, canopy layers, debris, crown size- Geospatial reference: GPS or measuring tape and compass-Tree height: measured with laser range finder or trigonometrically (known distance from tree vs. height of tree), assume 10% error Conclusions Mangrove forest are on pace to experience a 60% decrease in the next 20 years....
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This note was uploaded on 07/09/2011 for the course CWR 5104C taught by Professor Miralles during the Spring '11 term at FIU.
- Spring '11