洪水淹没数据接口对接，调整样式

guoshilong

2023-02-09 ca4683dbadf8f58c0e3cb5faf79b53e5bb2408f3

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float czm_readDepth(sampler2D depthTexture, vec2 texCoords)
{
    return czm_reverseLogDepth(texture2D(depthTexture, texCoords).r);
}