To use your own bathymetric data you can use binary matrix with negative elevations but keep the elev_m_minimum greater than 5. The depth of sea is set to 3*mesh_size when mesh_size is the spacing between elevation points. When the elev_m_minimum value inside the header file is less than 5 meters, the program assumes water exists in the scenery and creates elevation data for it. The data imported by the formats above typically does not contain bathymetric data, and for this reason Virtual Sailor creates underwater depth data on its own.
The accuracy of the imported data depends on the spacing of elevation points, Virtual Sailor can create successful scenery using spacing of 10 meters to 1000 meters between elevation points. Virtual Sailor imports any size of elevation matrix you use, however it is recommended not to use areas larger than 6000圆000 points of elevation because the amount of memory needed to store and process this data becomes very big. Tips and hints for importing scenery elevations
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One of the most detailed formats available today is the Shuttle Radar Topography Mission (SRTM), this data is freely available for download at this website:
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bin, How to obtain elevation dataĪny data format supported by 3DEM can be converted into a binary scenery matrix, these include the following types of data:
The elevation matrix is given in the form of a binary file with elevations given in meters, each value is two bytes long in the form of signed integer, the suffix of this file is. Each scenery in Virtual Sailor is built upon an elevation matrix file and a header file, these files are exported by a program called 3DEM created by Richard Horne, to download 3DEM and topographic data use this website:
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