Wave fetch for South Africa and Namibia at 100m scale

This data layer gives values of summed wave fetch in 32 angular sectors around focal cells, using a model modified from that given in Burrows et al (2012 - see reference). Wave fetch is the distance to the nearest land in a defined direction. The model performs a three-scale search for land around each cell in the model, sparsely (every 10km) up to 200km, every 1km up to 20km away, and every 100m up to 1km distant. Fetch is calculated up to 5km from the coastline.<br>Values represent the summed number of grid cells to the nearest land across all 32 11.5° sectors. Files are GeoTIFFs using the WGS84 projection.<br>

本数据层提供聚焦格点周边32个角扇形区域的总波浪风区（wave fetch）数值，所用模型基于Burrows等人2012年的研究（详见参考文献）修改得到。波浪风区（wave fetch）指特定方向上到最近陆地的距离。该模型针对每个格点开展三级尺度的近海陆地搜索：200km范围内以10km为步长稀疏采样，20km范围内以1km为步长采样，1km范围内以100m为步长采样。风区计算范围延伸至海岸线5km范围内。
数据值为全部32个11.5°扇形区域内，各区域到最近陆地的格点总数之和。数据文件为采用WGS84投影坐标系的GeoTIFF格式文件（GeoTIFF）。