AI Earth的download_url这个值从哪里来？

AI Earth的download_url这个值从哪里来？dataid, = sync_pulish_raster("uploaded_by_openapi", "http://example/test.tiff")
def sync_pulish_raster(name: str, download_url: str) -> (str, PublishStatus):
"""
调用发布办法，并查询发布状态，直到发布完成或者发布失败
:param name: 影像名称
:param download_url: 影像下载地址
:return: (影像ID， 影像发布状态)
"""
publish_raster_req: PublishRasterRequest = PublishRasterRequest()
publish_raster_req.name = name
publish_raster_req.download_url = download_url