LBA-ECO LC-03 Hypsography, Rivers, Roads, and DEM, Four Areas across Brazilian Amazon

This data set provides four related spatial data products for four study areas across the Brazilian Amazon: Manaus, Amazonas; Tapajos National Forest, Para Western (Santarem); Rio Branco, Acre; and Rondonia, Rondonia. Products include vector data showing (1) roads, (2) rivers, and (3) hypsography and (4) digital elevation model (DEM) images that were encoded from the hypsography vectors. There are 15 data files with this data set which includes 12 compressed *.zip files containing ArcInfo shape files and 3 GeoTIFFS.

This data set contains vector data showing roads, rivers, and hypsography for each study area in ESRI ArcGIS shapefile format. The vectors were hand-digitized by the Images Company in Brazil from paper maps produced by the Brazilian government. Depending on the scale of the original maps, the digitization errors vary. For some maps, some vectors are missing. Data were manually checked for duplicate or extra vectors. These data sets were derived from several map sheets produced from aerial coverages dating from 1974 to 1978.

The DEM images were encoded from the hypsography vectors and are provided in GeoTIFF format. The attribute value associated with each line and point in the vector segment is encoded into the image channel; the image channel is then filled in by interpolating image data between encoded vector data. For each DEM: 1 image channel with pixel resolution = 25m x 25m. DEM images are provided for Manaus, Tapajos National Forest, and Rondonia. The files for Rio Branco were unusable due to a documentation error.

DATA QUALITY STATEMENT: The Data Center has determined that there are questions about the quality of the data reported in this data set. The data set has missing or incomplete data, metadata, or other documentation that diminishes the usability of the products.

KNOWN PROBLEMS:

The data providers note that due to limited resources, these data have been neither validated nor quality-assured for general use. For that reason, extreme caution is advised when considering the use of these data.

- Any use of the derived data is not recommended because the results have not been validated.

- However, the DEM, vectors, and orthorectified SAR data (related data set) can be used if the user understands how these were produced and accepts the limitations.

本数据集为巴西亚马逊地区四个研究区域（马瑙斯，亚马孙州；塔帕约斯国家森林，帕拉西部（桑塔雷姆）；里奥布兰科，阿克里；以及罗德里格斯，罗德里格斯）提供了四个相关的空间数据产品。这些产品包括显示（1）道路，（2）河流，（3）高程和（4）数字高程模型（DEM）图像的矢量数据，这些图像由高程矢量编码而成。该数据集包含15个数据文件，其中12个为压缩的*.zip文件，包含ArcInfo形状文件，3个为GeoTIFF文件。

本数据集包含每个研究区域的道路、河流和高程的矢量数据，数据以ESRI ArcGIS形状文件格式提供。这些矢量数据由巴西图像公司手工数字化，源自巴西政府生产的纸质地图。根据原始地图的比例尺，数字化误差有所差异。对于某些地图，部分矢量数据可能缺失。数据已手动检查以排除重复或多余的矢量数据。这些数据集源自1974年至1978年间制作的多个航拍图。

DEM图像由高程矢量编码而成，并以GeoTIFF格式提供。矢量段中每条线和每个点的属性值编码到图像通道中；然后通过插值编码的矢量数据之间的图像数据填充图像通道。对于每个DEM：1个图像通道，像素分辨率为25m x 25m。提供了马瑙斯、塔帕约斯国家森林和罗德里格斯的DEM图像。由于文档错误，里奥布兰科的数据文件无法使用。

数据质量声明：数据中心已确定，本数据集中报告的数据质量存在疑问。数据集存在缺失或不完整的数据、元数据或其他文档，这降低了产品可用性。

已知问题：

数据提供者指出，由于资源有限，这些数据尚未经过验证或质量保证，适用于一般用途。因此，在考虑使用这些数据时，应极为谨慎。

- 不建议使用派生数据，因为结果尚未经过验证。

- 然而，如果用户了解这些数据的生成方式并接受其局限性，则可以使用DEM、矢量和正射校正合成孔径雷达（SAR）数据（相关数据集）。