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213 ActiveXperts Hydromagic 7.0

8.2

Geoid Converter

Geoid Conversion

The "Geoid File Conversion Utility" is a freeware utility which can be used to convert geoid files between different formats.

The utility is shipped with Hydromagic, but can be used as a stand alone tool as well.

The main goal of the software is to enable Hydromagic users to convert their geoid files to a format which can be read by the Hydromagic software.

There are so many different geoid file formats around that we decided to use our own format, and create an external tool to get files converted to our internal format.

The following geoid file formats are supported (both reading and writing):

Hydromagic Geoid File Format (GEO Files);

Trimble Geoid File Format (GGF Files);

Carlson Geoid File Format (GSF Files);

US National Geodetic Survey (NGS) File Format (BIN Files);

Natural Resources Canada Files (BYN Files);

Surfer V6 Binary Grid Files (GRD Files);

ASCII Geoid Files.

Geoid Converter

The tool is installed in the "Program" folder under the installation folder of the software.

It can be started using Windows Explorer, or by locating the software under the Windows Start Menu.

(C) 2015 ActiveXperts Software B.V.

Utilities 214

Converting Files

Converting geoid files with the Geoid File Conversion Utility is very straightforward. All you have to do is to select a source and destination format.

You can use any combination of source and destination formats (although it doesn't make sense to set the source and destination formats to the same).

After selecting the formats, use the "Browse..." buttons to select an input and output file.

In order to use geoid files in Hydromagic, the destination file has to be written in the Hydromagic

"Geoids" folder which is selected by default.

For destination files other then the Hydromagic Geoid Files, you can select another location as well.

When done, click the "Start" button and the conversion process should start. Converting files usually only takes a couple of seconds.

ASCII Files

The Geoid File Conversion Utility supports two kinds of ASCII geoid files at this moment.

Because there is no real standard for ASCII geoid files, the supported files are described below:

ASCII Geoid Height Grid File (*.grd)

You should use this option for a file which contains a header value contained by separation values for each cell.

The header contains six values in the following order: South boundary, north boundary, west boundary, east boundary, vertical cell size and horizontal cell size.

27. 00000 36. 97500 - 14. 00000 - 0. 02500 0. 02500 0. 02500

52. 383 52. 342 52. 302 52. 257 52. 205 52. 147 52. 073

51. 978

(C) 2015 ActiveXperts Software B.V.