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Beijing-Impervious-Compare

4 geotiff representing the impervious surface of Beijing (30m)

image

  • 1是建成区,其他是0

  • urban_beijing_classified

    Beijing City Lab自己做的2015年30m城市制图 用GEE https://www.beijingcitylab.com/data-released-1/

  • 2013年from-glc

    Beijing City Lab下载拼接提取的2013年的from-glc建成区,本地再把北京区域裁剪出来

  • 2015年from-glc

    from-glc官网上下载的2015v1,本地拼接后再把北京区域裁剪出来。这一年的不知道为什么建成区提的很范围很大,城市里的湖泊一类的都挤小了,impervious连成一片

  • 2017年from-glc

    from-glc官网上下载的2017v1,在110E50N这一景的最下面(也就是40N纬线)上有一个条带的缺失,值为0,不知道为什么。这个缺失我是用from-glc 2013给补上

  • 栅格处理

    因为原始数据不一样,裁剪重分类步骤不一样,最后要统一一下。本地先在qgis里Raster->Conversion->Translate里面把data type改成Byte (8 digit unsigned int) 本来这样大约(872888288)/8=77050784 byte 70多M一景,但是在Arcgis里面不管是不是已经30m再重采样一遍,就可以缩小到1-2M

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