Comments (3)
推测投影中心并不是图像中心。
如果投影中心是是图像中心,经度范围应该是关于投影中心经度对称的
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我用MICAPS4打开了几个AWX文件看了一下,发现MICAPS4只有一套固定投影("D:\MICAPS4.8.0\config\Map\projections.ini"),但逻辑确实是用投影中心当作图像中心。
而AWX二级头信息中的经纬度范围确实是MICAPS4那一套固定投影产生的范围,和它本身的投影中心并不匹配。
综合文档中说二级头信息中的经纬度范围是大致范围,所以投影中心优先级应当高于经纬度范围。
所以应该可以认为这个思路没问题,不是bug。至少不是咱作为数据用户端解析的bug。
Lines 273 to 280 in 4b1e4da
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我用MICAPS4打开了几个AWX文件看了一下,发现MICAPS4只有一套固定投影("D:\MICAPS4.8.0\config\Map\projections.ini"),但逻辑确实是用投影中心当作图像中心。
而AWX二级头信息中的经纬度范围确实是MICAPS4那一套固定投影产生的范围,和它本身的投影中心并不匹配。
综合文档中说二级头信息中的经纬度范围是大致范围,所以投影中心优先级应当高于经纬度范围。
所以应该可以认为这个思路没问题,不是bug。至少不是咱作为数据用户端解析的bug。
Lines 273 to 280 in 4b1e4da
实际测试发现,兰伯特投影和墨卡托投影的经纬度确实与实际数据不符,目前正在解决当中。
已有的结果表明,墨卡托投影下lat_ts需指定为0(默认),而不是数据头信息中的标准纬度,才能保持投影正确。
兰伯特投影也存在轻微的位置漂移,如下图,目前正在查找原因。
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