How to create a model gridded bathymetry?

Step 1 - Extract Ocean bathymetry data from ETOPO 2'

Google Earth

Make sure you have Google Earth correctly configured!!

Obtain the ETOPO 2' extraction domain limits by reading the Max and Min values of Longitude and Latitude for your domain from Google Earth.

Etopo data file

The internet address where to download the data is http://www.ngdc.noaa.gov/mgg/global/global.html;
Download the ETOPO2V2 raw binary data to use with the ConvertToXYZ program OR, if possible, rather use the intranet address which is \\kepler\DataCenter1\DataCenter\DadosBase\Oceanografia\Batimetria\Etopo\Etopo2\Data

A sample configuration file ConvertToXYZ.dat is:

<begin_window>
FILE_TYPE                   : 2
INPUT_FILENAME              : \\kepler\DataCenter1\DataCenter\DadosBase\Oceanografia\Batimetria\Etopo\Etopo2\Data\etopo2.dat
OUTPUT_FILENAME             : SLouisCoast_ETOPO2.xyz
TOP                         : 17
BOTTOM                      : 14
LEFT                        : -18
RIGHT                       : -14
MAXIMUM                     : 1
MINIMUM                     : -9999
WRITE_AS_BATHYMETRY         : 1
CONVERT_TO_HDF5             : 0
<end_window>

Sample of XYZ data extracted from ETOPO 2'. How the bathymetry XYZ file should look like.

MOHID GIS

Open new project in Mohid GIS

Give name and location to new project, then save

Add new data item

Select data item and open

Right-click data, zoom select, right-click, properties

Click on settings to set the colar palette and color range

Choose min depth (negative if above sea level), max depth and color palette

IMPORTANT: Click Save All from the Data Items menu. Otherwise you risk to loose all your work!

Step 2 - Create a coast line

Create coast line in Google Earth

Create a polygon shaped like the line of the coast

Right-click on polygon, then "save as"

Save the file in Kml format (NOT in Kmz format)

Run Kml2mohid

Get the Kml2Mohid program, edit a batch file, and run the program

Successfully run Kml2Mohid program.

Sample polygon (.xy) file

Import coastline polygon in Mohid

Click Data Items menu, then select Add Data Items...

Select folder, select polygon file type, select file and click open

Right-click polygon data, then select Properties

Click on settings

Select Constant and choose a color

Very important: Save All from the Data Items menu

General look of ETOPO points data layer and coastline polygon layer

Step 3 - Create the model domain regular grid in MOHID GIS

Define the grid

Choose bottom-left origin for the model domain

Choose model domain grid resolution with Google Earth

Click on Data Item menu, then select New Data Item

Select Simple Grid, then click on Browse

Give name, select Grid file as file type, click on Save

Click Ok

Right-click the Grid layer, then select Properties from the menu

Define origin, define resolution, define grid size, choose Simple Geographic coordinates type (and NOT Geographic as seen in the figure. CAUTION!)