LBA REGIONAL VEGETATION AND SOILS, 1-DEGREE (WILSON AND HENDERSON-SELLERS)

This data set is a subset of a global vegetation and soils data set by Wilson and Henderson-Sellers (1985a). The subset was created for the study area of the Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) in South America (i.e., 10? N to 25? S, 30? to 85? W). The data are in ASCII GRID format. The original global data set (Wilson and Henderson-Sellers 1985a) is an archive of soil type and land cover data derived for use in general circulation models (GCMs). The data were collated from maps depicting natural vegetation, forestry, agriculture, land use, and soil, and they were archived at a resolution of 1? latitude by 1? longitude. The data set indicates soil type, soil data reliability, primary vegetation, secondary vegetation, and land cover data reliability. Approximately 50 land cover classifications are used, including categories for agricultural and urban uses. The inclusion of secondary vegetation type is particularly useful in areas with cover types that may have a fragmented distribution, such as in areas of urban development. The soil type data are classified according to climatically important properties for GCMs, and they indicate color (light, medium, or dark), texture, and drainage quality of the soil. The land cover data are compatible with the soils data, forming a coherent and consistent data set. The reliability of the land cover data is ranked on a scale of 1 to 5 (high to low). The reliability of the soil data is ranked as high, good, moderate, fair, or poor. Recommendations for the use of these data, as well as more detailed information can be found in Wilson and Henderson-Sellers (1985b). Further data set information can be found at ftp://daac.ornl.gov/data/lba/land_use_land_cover_change/wilhend/comp/wilhend_readme.pdf. LBA was a cooperative international research initiative led by Brazil. NASA was a lead sponsor for several experiments. LBA was designed to create the new knowledge needed to understand the climatological, ecological, biogeochemical, and hydrological functioning of Amazonia; the impact of land use change on these functions; and the interactions between Amazonia and the Earth system. More information about LBA can be found at http://www.daac.ornl.gov/LBA/misc_amazon.html.本数据集为Wilson与Henderson-Sellers（1985a）所构建的全球植被与土壤数据集的子集，其针对南美洲亚马孙大型生物圈-大气实验（Large Scale Biosphere-Atmosphere Experiment in Amazonia, LBA）的研究区域制作，该区域范围为北纬10°至南纬25°、西经30°至85°。数据采用ASCII GRID格式存储。 原始全球数据集（Wilson与Henderson-Sellers，1985a）是为通用循环模型（General Circulation Models, GCMs）研发而整理的土壤类型与土地覆盖数据档案。该数据整合了自然植被、林业、农业、土地利用及土壤相关专题地图，以1°纬度×1°经度的分辨率进行归档存储。数据集包含土壤类型、土壤数据可靠性、原生植被、次生植被以及土地覆盖数据可靠性等核心字段，共采用约50种土地覆盖分类体系，涵盖农业与城市用地类别。其中次生植被类型的设置，对分布较为破碎的覆盖类型区域（如城市开发区）尤为实用。土壤类型数据依据通用循环模型所需的气候关键属性进行分类，涵盖土壤颜色（浅、中、深）、质地及排水性能。土地覆盖数据与土壤数据适配性良好，共同构成一套连贯统一的数据集。土地覆盖数据的可靠性以1至5级评分（1代表高可靠性，5代表低可靠性）划分；土壤数据可靠性则分为高、良好、中等、一般、较差五个等级。 关于本数据集的使用建议及更多详细信息，可参考Wilson与Henderson-Sellers（1985b）。 更多数据集相关信息可查阅以下链接：ftp://daac.ornl.gov/data/lba/land_use_land_cover_change/wilhend/comp/wilhend_readme.pdf。 亚马孙大型生物圈-大气实验（Large Scale Biosphere-Atmosphere Experiment in Amazonia, LBA）是由巴西牵头的跨国合作研究计划，美国国家航空航天局（National Aeronautics and Space Administration, NASA）为多项实验的主要赞助方。该计划旨在获取新知识，以解析亚马孙地区的气候、生态、生物地球化学及水文循环功能，土地利用变化对这些功能的影响，以及亚马孙与地球系统间的相互作用。更多关于LBA的信息可访问以下链接：http://www.daac.ornl.gov/LBA/misc_amazon.html。