Brunton Multi-Navigator Especificações descarregar pdf (Página 114)

OziExplorer's own Formats

These formats below were developed especially for use in OziExplorer and OziExplorerCE. The

Img2Ozf and MapMerge programs create Ozfx3 images. OZF and OZF2 are supported but no longer

produced.

OZF2

/ OZFx3

These formats which give good compression, can be quickly paged from disk, are

efficient for decompression of small image sections and also have separate images built into the

format for zoom levels 25% and below. Other zoom levels below 100% (90, 80, 70 ...) are created as

needed by OziExplorer using a smoothing function and look almost as good as the original image.

There is a small disadvantage of having some of the zoom images included in the file as the file size

is slightly larger but the nice looking zooms make up for this.

See the separate help for the Img2ozf program for more details.

The OZF2 / OZFx3 format is the best format to use in OziExplorer for most map images.

Map Projections

A map projection is a means of projecting the spherical earth onto a flat plane.

There are numerous projection methods available, OziExplorer supports the more common these. If

there is a need for a projection not supported a request to the author of the software may result in it

being included in future versions.

It is essential that the correct map projection be specified. In many cases the projection is not given

or the projection is given but not the required parameters, in these cases it is very difficult to work

out what to use.

Also be aware then many maps in digital form may have had the projection altered during the

imaging process, as an example many of the US DRG maps have been reprojected from Polyconic to

Transverse Mercator (actually UTM format).

Supported Projections and Grid Systems

Latitude/Longitude

This is a projection where the lines of latitude and longitude are projected as straight lines at 90

degrees to each other.

It is also used for calibrating a map in the shareware version or in the registered version if the true

projection is not known.

Mercator

Commonly used in marine charts. The rhumb lines (lines of constant bearing) are straight lines. The

latitude and longitudes are straight lines which meet at right angles.

Transverse Mercator

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