GIMMS NDVI3g网格细胞不完全是方形的吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 10 - t12:26:18z //www.hoelymoley.com/feeds/question/7385 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/7385 3 GIMMS NDVI3g网格细胞不完全是方形的吗? fdetsch //www.hoelymoley.com/users/5322 2016 - 01 - 27 t13:14:59z 2016 - 01 - 27 t14:09:02z < p > < a href = " https://nex.nasa.gov/nex/projects/1349/wiki/general_data_description_and_access/ " rel =“nofollow”> < / >的官方数据描述最近更新GIMMS NDVI3g记录描述数据集的电网参数如下。

grid-name: Geographic Lat/Lon pixel-size: 1/12=0.0833 degrees size-x: 4320 size-y: 2160 upper-left-lat: 90.0-1/24 upper-left-lon: -180.0+1/24 lower-right-lat: -90.0+1/24 lower-right-lon: 180.0-1/24

This means (at least to my understanding) that in x-direction, the cell size equals

> (180-1/24) * 2 / 4320 [1] 0.08331404

whereas in y-direction, the cell size equals

> (90-1/24) * 2 / 2160 [1] 0.08329475

I.e., the single grid cells are not entirely square-shaped. Am I missing something in my calculation or does the officially described pixel size of "1/12=0.0833 degrees" simply result from rounding effects of the manually calculated edge lengths in x- and y-direction?

 //www.hoelymoley.com/questions/7385/gimms-ndvi3g-grid-cells-not-entirely-square-shaped/7386 # 7386 4 回答的Christoph GIMMS NDVI3g网格细胞不完全是方形的吗? Christoph //www.hoelymoley.com/users/681 2016 - 01 - 27 t14:09:02z 2016 - 01 - 27 t14:09:02z < p >你的理解是不准确的。美元的转变\压裂{1 ^ \保监会}{24}$只是找出相关,像素中心所在地,从哪里开始,当你想找到合适的网格索引的某一点。的决议,这是简单得多。我们有4320美元美元像素覆盖^ \保监会360美元在经度方向,即美元的分辨率\压裂{1 ^ \保监会}{12}$同样纬度的决议。< / p > < p >的square-nature这些像素,它们只是广场上lat-lon坐标,不是长在地上。< / p >
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