LBA-ECO LC-07 Wetland Extent, Vegetation, and Inundation: Lowland Amazon Basin

This data set provides a map of wetland extent, vegetation type, and dual-season flooding state of the entire lowland Amazon basin. As described in Hess et al. (2015), the classified image was derived from the Global Rain Forest Mapping Project (GRFM) Amazon mosaics (Rosenqvist et al 2000; Siqueira et al. 2002) acquired during Oct.-Nov. 1995 and May-June 1996, corresponding to the low-flood and high-flood seasons for much of the central Amazon.
Hess et al. (2003) mapped wetland extent, vegetative cover, and flooding state for an 18 degree � 8 degree portion of the central Amazon using the dual-season GRFM mosaics. This study extends the previous wetlands mapping to report the first validated estimate of wetland extent, cover, and flooding for the lowland Amazon basin.
A wetlands mask was created by segmentation of the mosaics and clustering of the resulting polygons; a rules set was then applied to classify wetland areas into five land cover classes and two flooding classes using dual-season backscattering values. The mapped wetland area of 8.4 � 105 km2 is equivalent to 14 % of the total basin area (5.83 � 106 km2) and 17% of the lowland basin (5.06 � 106 km2). The mapped flooding extent is representative of average high and low-flood conditions for latitudes north of 6 degrees S; flooding conditions were less well captured for the southern part of the basin. The wetlands map is provided in GeoTIFF format using two coordinate systems: unprojected (Geographic) with pixel size of 3 arcseconds, and Albers Conical Equal Area with pixel size of 100 m.

本数据集提供了亚马逊低地流域全域的湿地范围、植被类型以及双季洪水状态的地图。正如Hess等人（2015年）所述，该分类图像源于全球雨林制图项目（GRFM）的亚马逊镶嵌图（Rosenqvist等人，2000年；Siqueira等人，2002年），这些图像分别于1995年10月至11月以及1996年5月至6月获取，对应亚马逊大部分地区的低洪水和高洪水季节。Hess等人（2003年）利用双季GRFM镶嵌图，对亚马逊中心地区18度×8度区域内的湿地范围、植被覆盖和洪水状态进行了制图。本研究将之前的湿地制图扩展，首次报告了低地亚马逊流域湿地范围、覆盖面积和洪水状态的验证估计。通过镶嵌图的分割和生成多边形的聚类，创建了湿地掩膜；随后，应用规则集根据双季后向散射值将湿地区域分类为五种土地利用类型和两种洪水类型。制图得出的湿地面积为8.4×10^5平方公里，相当于流域总面积（5.83×10^6平方公里）的14%以及低地流域面积（5.06×10^6平方公里）的17%。制图所得的洪水范围代表了北纬6度以北的平均高洪水和低洪水条件；对于流域南部的洪水条件，捕捉效果较差。湿地地图以GeoTIFF格式提供，采用两种坐标系：未投影（地理）坐标系，像素大小为3弧秒，以及Albers圆锥等面积坐标系，像素大小为100米。