Netlogo GIS坐标转换问题

我想导出一个基于shp文件的NetLogo模拟输出到栅格,使用:

to export-GIS
  let patches_out nobody
  ask one-of patches [set patches_out gis:patch-dataset pcolor]
  gis:store-dataset patches_out (word "usos" ".asc")
end

但它会输出:

Extension exception: you must define a coordinate transformation before using any other GIS features
error while patch 17 -10 running GIS:PATCH-DATASET
  called by procedure EXPORT-GIS
  called by Button 'export-GIS'

如何定义此坐标转换?

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