Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | NASA-CR-179895, NAS 1.26:179895 |
| 来源ID | NTRS_Document_ID: 19870001804 |
| Canopy reflectance modeling in a tropical wooded grassland | |
| Simonett, D.; Franklin, J. | |
| 英文摘要 | Geometric/optical canopy reflectance modeling and spatial/spectral pattern recognition are used to study the form and structure of savanna in West Africa. An invertible plant canopy reflectance model is tested for its ability to estimate the amount of woody vegetation cover in areas of sparsely wooded grassland from remotely sensed data. Dry woodlands and wooded grasslands, commonly referred to as savannas, are important ecologically and economically in Africa, and cover approximately forty percent of the continent by some estimates. The Sahelian and Sudanian savanna make up the important and sensitive transition zone between the tropical forests and the arid Saharan region. The depletion of woody cover, used for fodder and fuel in these regions, has become a very severe problem for the people living there. LANDSAT Thematic Mapper (TM) data is used to stratify woodland and wooded grassland into areas of relatively homogeneous canopy cover, and then by applying an invertible forest canopy reflectance model to estimate directly the height and spacing of the trees in the stands. Since height and spacing are proportional to biomass in some cases, a successful application of the segmentation/modeling techniques will allow direct estimation of woody biomass, as well as cover density, over significant areas of these valuable and sensitive ecosystems. Sahelian savanna sites in the Gourma area of Mali being used by the NASA/GIMMS project (Global Inventory Modeling and Monitoring System, at Goddard Space Flight Center), in conjunction with CIPEA/Mali (Centre International pour l'Elevage en Afrique) will be used for testing the canopy model. The model will also be tested in a Sudanian zone crop/woodland area in the Region of Segou, Mali. |
| 英文关键词 | CANOPIES (VEGETATION) GRASSLANDS MODELS REFLECTANCE TROPICAL REGIONS AFRICA PATTERN RECOGNITION REMOTE SENSING SPATIAL RESOLUTION SPECTRAL RESOLUTION THEMATIC MAPPERS (LANDSAT) THEMATIC MAPPING |
| 出版年 | 1986 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| URL | http://hdl.handle.net/2060/19870001804 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/259070 |
| 推荐引用方式 GB/T 7714 | Simonett, D.,Franklin, J.. Canopy reflectance modeling in a tropical wooded grassland,1986. |
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