The measurement of depth of water in oceans, seas, or lakes - GEBCO bathymetry gridded data for North Sea / Baltic Sea - Derived Data

**Overview**

This dataset contains global bathymetry, or water depth, measurements from the General Bathymetric Chart of the Oceans (GEBCO), converted into the format needed for WRF's Pre-processing System (WPS). The data are read in for the use of a depth-dependent water surface roughness scheme.

**Data Details**

File is zipped directory topobath_30s which includes the following files:
.txt:
index

.bil:
08401-09600.13201-14400
10801-12000.15601-16800
14401-15600.13201-14400
18001-19200.15601-16800
20401-21600.15601-16800
22801-24000.15601-16800
25201-26400.15601-16800
08401-09600.14401-15600
10801-12000.16801-18000
14401-15600.14401-15600
18001-19200.16801-18000
20401-21600.16801-18000
22801-24000.16801-18000
25201-26400.16801-18000
08401-09600.15601-16800
12001-13200.13201-14400
14401-15600.15601-16800
18001-19200.18001-19200
20401-21600.18001-19200
22801-24000.18001-19200
25201-26400.18001-19200
08401-09600.16801-18000
12001-13200.14401-15600
14401-15600.16801-18000
18001-19200.19201-20400
20401-21600.19201-20400
22801-24000.19201-20400
26401-27600.16801-18000
09601-10800.13201-14400
12001-13200.15601-16800
15601-16800.15601-16800
19201-20400.14401-15600
21601-22800.14401-15600
24001-25200.14401-15600
26401-27600.18001-19200
09601-10800.14401-15600
12001-13200.16801-18000
15601-16800.16801-18000
19201-20400.15601-16800
21601-22800.15601-16800
24001-25200.15601-16800
27601-28800.16801-18000
09601-10800.15601-16800
13201-14400.13201-14400
15601-16800.18001-19200
19201-20400.16801-18000
21601-22800.16801-18000
24001-25200.16801-18000
27601-28800.18001-19200
09601-10800.16801-18000
13201-14400.14401-15600
16801-18000.16801-18000
19201-20400.18001-19200
21601-22800.18001-19200
24001-25200.18001-19200
10801-12000.13201-14400
13201-14400.15601-16800
16801-18000.18001-19200
19201-20400.19201-20400
21601-22800.19201-20400
24001-25200.19201-20400
10801-12000.14401-15600
13201-14400.16801-18000
18001-19200.14401-15600
20401-21600.14401-15600
22801-24000.14401-15600
25201-26400.14401-15600

**Data Quality**

The provided 30 arc second GEBCO bathymetry data were masked with WRF's 30-second land mask data and over-water measurements (negative in GEBCO) were converted to depth (positive number relative to water surface). The data were then compared to existing lake depth values in WRF where only minor differences were found.

**Uncertainty**

The land mask data and bathymetry data are not from the same source but were collected in a similar fashion. Areas may exist where GEBCO is providing over-water information while WRF's land mask shows it is land, and vice-versa. These situations are accounted for by setting the depth to a default value where ever inconsistencies are found.

**Constraints**

This data are currently set up for ease of use with WRF and proper care should be taken when trying to use the data for other purposes. It is recommended that the GEBCO data be downloaded directly in this case.