PRE-LBA FLOODAMA PROJECT DATA

This data set provides a digital mosaic of the Amazon River floodplain that was compiled using Landsat TM images. This mosaic was planned in July 1995 as an activity of the EOS-IDS Project that was developed with cooperation among INPE, CENA, University of Washington in Seattle (UW), University of California in Santa Barbara (UCSB), and NASA. The mosaic is composed by 29 Landsat TM images covering a period from 1986 to 1995 that were selected with minimum cloud cover and within the July to September high water season of the Amazon River. These images were geometrically corrected using ground control points extracted from topographic charts and image charts at the 1:250,000 scale. In addition, these images were radiometrically rectified to 231/062 (Manaus region) TM image using the method developed by Hall et al. (1991). The radiometric rectification applied had a good performance for bands 3, 5, and 7, for most of the scenes. For bands 1 and 2 the radiometric rectification was limited, especially for scenes with intense haze. Nevertheless, the overall performance of radiometric normalization allowed the production of a uniform data set for the entire Brazilian Amazon River mainstem floodplain. The mosaic was then built using the best bands (rectified or non-rectified) of the TM images with 90 meter spatial resolution.

The mosaic data are provided in geoTIFF-formatted files, rectified and geocoded, for six TM bands (1 to 5 and 7) with 90-meter spatial resolution. The mosaic is divided in two parts:

Part 1, from the mouth of the Amazon river in Brazil to the Brazil/Peru boundary and
Part 2, from the Brazil/Peru boundary to its spring.

There is also a 500-meter resolution mosaic covering all the Amazon river (from spring to the mouth) with geoTIFF-formatted data files for TM bands 3, 4, and 5. The processed, quality controlled and integrated data in the documented Pre-LBA Data sets were originally published as a set of three CD_ROMs (Marengo and Victoria, 1998) but are now archived individually.

本数据集提供一幅亚马逊河泛滥平原的数字镶嵌影像图，其制作基于陆地卫星专题制图仪（Landsat TM）影像。该镶嵌图于1995年7月启动规划，作为EOS-IDS项目的核心工作之一，该项目由INPE、CENA、西雅图华盛顿大学（University of Washington in Seattle，UW）、圣巴巴拉加州大学（University of California in Santa Barbara，UCSB）与美国国家航空航天局（NASA）联合开发。

该镶嵌图由29景Landsat TM影像拼接而成，影像采集时段覆盖1986年至1995年，选取时严格控制云量至最低，且全部取自亚马逊河7月至9月的高水位季。所有影像均采用1:25万比例尺地形海图与影像海图提取的地面控制点完成几何校正。此外，本研究采用Hall等人（1991）提出的辐射校正方法，将所有影像统一辐射匹配至231/062（马瑙斯区域）TM影像的辐射基准。本次辐射校正对多数影像的第3、5、7波段效果优异，但针对第1、2波段的校正精度有限，尤其在雾霾较重的影像中表现更为明显。尽管如此，辐射归一化的整体表现仍可支撑整个巴西亚马逊河干流泛滥平原匀质数据集的制作需求。最终，本数据集采用空间分辨率为90米的TM影像的最优波段（经或未经辐射校正）拼接生成该镶嵌图。

该镶嵌图数据以geoTIFF格式文件存储，已完成校正与地理编码，包含空间分辨率为90米的TM影像第1至5波段及第7波段，共计6个波段。该镶嵌图分为两个部分：
1. 巴西境内亚马逊河河口至巴秘鲁边界段；
2. 巴秘鲁边界至亚马逊河源头段。

此外，本数据集还提供一幅空间分辨率为500米的全流域镶嵌图，覆盖亚马逊河从源头至河口的全河段，其数据以geoTIFF格式存储，包含TM影像第3、4、5波段。

本数据集内经过处理、质量控制与整合的预LBA（Pre-LBA）文档化数据集，最初以三张CD-ROM光盘的形式发布（Marengo与Victoria，1998），目前已转为单独归档存储。