Update README.md

README.md

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 The Global Land Cover by National Mapping Organizations (GLCNMO) is geospatial information in raster format which classifies the status of land cover of the whole globe into 20 categories. [For detailed information](https://globalmaps.github.io/glcnmo.html)
 
 You can download the data in GeoTiff format (*.zip).  
-The data is divided into 4 tiles. The size of a tile is 90 degrees in latitude and 180 degrees in longitude, that is, 43,200 pixels by 21,600 pixels with 15 second resolution.
+The data is divided into 4 tiles. The size of a tile is 90 degrees in latitude and 180 degrees in longitude, that is, 21,600 pixels by 43,200 pixels with 15 second resolution.
 
 ## Note
 Users shall mark the data source and indicate copyright on the product when they use the data.