Water layer

The water layer represents any kind of surface (river, sea, lake...)

Name	Type	Constraints	Definition
the_geom	POLYGON	X Y dimensions	Geometry
id_water	INTEGER	Primary Key	Unique Identifier
id_source	VARCHAR	not null	Identifier of the feature from the input datasource
type	VARCHAR	not null; in type list	Type of water
zindex	INTEGER	not null ; ≥ 0 ; ≤ 1	Defines the position with respect to the ground. 0 indicates that the object is on the ground. 1 indicates that the object is above the ground surface.

type column values

List of all possible values for type column.

Term	Definition	Source
aqueduct	A watercourse constructed to carry water from a source to a distribution point far away	-
canal	An artificial open flow waterway used to carry useful water for transportation, waterpower, or irrigation	2
bay	An inlet of a sea or lake which is mostly surrounded by land,	3
lake	A large body of water localized in a basin surrounded by dry land	4
lagoon	A shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses	5
mangrove	Water part of a mangrove (see vegetation layer)	6
pond	A small area of fresh water	7
basin	An area artificially graded to hold water.	8
water	Any water area	-