这是一个地形的源码，里面实现了流水，天空，云飘，和高低起伏的山峦,This is a terrain source, which has running water, sky, cloud drift, and low hills

e00 和 tif 格式 1:3000万中国数字地图，包括国界、省界、地级市、县级、地形、水系、山峰、铁路、公路等数据-tif format and e00 million Chinese 1:3000 digital map, including borders, provincial boundaries, prefecture-level cities, county-level, terrain, water, mountains, railways, highways and othe