Table 2. Summary of channel space data.

Object	Parameter	Unit	Remark
Hydrologic factors	Topography of river bottom	m	Digital elevation
	Water depth	m
	Depth contour	line	1 m intervals
	Flow direction		Two-dimensional (2D) vector, MAX dot matrix data processing
	Flow speed
Channel	Channel boundary	9 sets	Three seasons of drought, mild weather, and flooding
	Navigational aid sign	8 pcs	5 pcs in upper reaches, 3 pcs in lower reaches
	Obstruction sign	5 pcs	Sunken ships
Special water area/route	Anchorage sign	2 pcs
	Anchorage boundary line	8 lines
	Ferry ship route	4 routes
Aquatic buildings	Bridge pier	18 piers
	Bridge pier number mark	18 pcs	8+10 (Numbers 7–16)
	Dock	52 docks