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发表于 2023-11-11 09:24:26
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这个是官方教程里关于投影选择的推荐,中纬度用兰伯特
In the below illustrations of the Lambert conformal, polar stereographic, and Mercator projections, the so-called true latitude (or true latitudes, in the case of the Lambert conformal), is the latitude at which the surface of projection intersects or is tangent to the surface of the earth. At this latitude, there is no distortion in the distances in the map projection, while at other latitudes, the distance on the surface of the earth is related to the distance on the surface of projection by a map scale factor. Ideally, the map projection and its accompanying parameters should be chosen to minimize the maximum distortion within the area covered by the model grids, since a high amount of distortion, evidenced by map scale factors significantly different from unity, can restrict the model time step more than necessary. As a general guideline,
在下面的兰伯特合奏投影、极立体投影和墨卡托投影的图示中,所谓的真纬度(或真纬度,在兰伯特合形的情况下)是投影表面相交或与地球表面相切的纬度。在这个纬度上,地图投影中的距离没有失真,而在其他纬度上,地球表面的距离通过地图比例因子与投影表面上的距离相关。理想情况下,应选择地图投影及其附带参数,以最小化模型网格覆盖区域内的最大畸变,因为大量畸变(由与统一性明显不同的地图比例因子证明)会限制模型时间步长。作为一般准则,
the polar stereographic projection is best suited for high-latitude WRF domains,
极坐标立体投影最适合高纬度WRF域,
the Lambert conformal projection is well-suited for mid-latitude domains, and
Lambert 等角投影非常适合中纬度域,并且
the Mercator projection is good for low-latitude domains or domains with predominantly west-east extent.
墨卡托投影适用于低纬度域或以东西向范围为主的域。
The cylindrical equidistant projection is required for global simulations, although in its rotated aspect (i.e., when pole_lat, pole_lon, and stand_lon are changed from their default values) it can also be well-suited for regional domains anywhere on the earth’s surface.
圆柱等距投影是全局模拟所必需的,尽管在其旋转方面(即,当 pole_lat、pole_lon 和 stand_lon 从其默认值更改时),它也非常适合地球表面任何地方的区域域。 |
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