extracting terrain via open platform
通过开放平台实现提取地形模型的效果
Due to the limit of request origins to open platform, this code cannot run locally.
由于ApiKey对于访问源的限制，该程序无法在本地运行
document.getData(zoom,x,y,resolution,imgResolution,getType)
zoom: zoom of extraction area 提取区域的缩放
x: X-coordinate of the picture 图像x坐标
y: Y-coordinate of the picture 图像y坐标
resolution: model resolution, must be the power of 2, 1024 recommended 模型分辨率(必须是2的次方)，推荐值1024
imgResolution: texture resolution, must be the power of 2, 4096 recommended 贴图分辨率(必须是2的次方)，推荐值4096
getType: the type of data you want to get. 你想获取的数据类型. "model"||"img"