National Bathymetry (BATNAS)

Free

Publisher: BIG (Badan Informasi Geospasial)
First Released: 2014
Latest Version: BATNAS v2.1 (as of 2022)

Specification :

Coverage Area: Entire marine territory of Indonesia (ZEE & coastal zones)

Horizontal Datum : WGS 84 (EPSG:4326)

Vertical Datum : Mean Sea Level (MSL)

Resolution (Grid Size) : ~250 m (BATNAS v2.1),

File Format : GeoTIFF

Depth Unit : Meters (Negative values for depth)

Data Type : 16-bit signed integer

Interpolation Method : Kriging and multi-source weighted averaging

Data Sources : Echosounder, single/multibeam sonar, nautical charts, satellite-derived

Accuracy : Variable (depends on region and survey method), estimated ±5–30 m

Update Frequency : Periodic (non-annual); depends on new survey availability

Access / Licensing :Open data under BIG license, available via BIG Geospasial Portal