West Africa Coastal Vulnerability Mapping: Subset of High and Low Resolution Altimeter Corrected Elevations 2 (ACE2)

The West Africa Coastal Vulnerability Mapping: Subset of High and Low Resolution Altimeter Corrected Elevations 2 (ACE2) data set consists of extracts from the 3 arc-second (high) and 30 arc-second (low) resolution ACE2 data product packaged as GeoTIFFs. It includes values within 200 kilometers of the coast. ACE2 was created by synergistically merging the Shuttle Radar Topography Mission (SRTM) data set with Satellite Radar Altimetry within the region bounded by 60 degrees N and 60 degrees S. The primary altimetry data set used in the generation of this data set was the European Remote Sensing (ERS-1) Geodetic mission, which due to its small across track spacing presents a uniquely dense spatial distribution of tracks altimetry data over land surfaces. Data from ERS-2 and the Environmental Satellite (Envisat) Ku-band are included where appropriate. All of the altimeter data have been reprocessed using the Berry Expert System to retrack the waveforms. Over 11,000,000,000 SRTM pixels were adjusted using this unique network of control arcs of altimeter derived height data. In rainforest regions, extensive investigation has shown that the altimetry data returns ground values, whereas the SRTM signal bounces off the canopy. Thus ACE2 does a better job of providing ground values than SRTM in forested coastal regions of West Africa.

西非沿海脆弱性映射数据集：高分辨率与低分辨率测高仪校正高程数据2（ACE2）子集，包括3弧秒（高分辨率）和30弧秒（低分辨率）的ACE2数据产品提取，以GeoTIFF格式封装。该数据集涵盖了沿海200公里范围内的数值。ACE2数据集通过协同整合位于北纬60度和南纬60度之间的轨道雷达测高任务（SRTM）数据集与卫星雷达测高技术而构建。在生成此数据集时，主要使用的测高数据集为欧洲遥感（ERS-1）大地测量任务，由于其跨越轨道间隔较小，因此在陆地表面上形成了独特的密集轨迹测高数据空间分布。在适当的情况下，包含了ERS-2和环境卫星（Envisat）Ku频段的数据。所有测高数据均经过Berry专家系统重新处理，以重新追踪波形。超过110亿个SRTM像素点通过这一独特的测高仪导出高度数据控制弧网络进行调整。在雨林地区，广泛的调查表明，测高数据返回地面值，而SRTM信号在树冠上反射。因此，ACE2在非洲西海岸森林覆盖的沿海地区提供地面值的能力优于SRTM。