Map.gov.hk - Co-ordinates become image

[debuggingfuture]

try to extract a hiking route's co-ordinates but an image is found

p.s. related OPEN data on data.gov.hk is in GeoTiff
https://data.gov.hk/en-data/dataset/hk-landsd-openmap-orthophoto-map-of-hong-kong

or in PDF and some basic data in csv (credit to eric)
http://www.landsd.gov.hk/mapping/en/digital_map/mapprod.htm