Brunton Multi-Navigator Especificações descarregar pdf (Página 122)

A dialog will be opened which requests some of this information.

Map Datum

specify the map datum to be used.

Map UTM Zone

- specify the zone, 2 digits only. For UTM projection maps the UTM zone number

must be known to import the map so you must know this in advance. On the USA DRG maps the

zone number is usually provided on the lower left hand corner of the map image, the datum is also

provided there. You will need to open the map image in a paint program such as Paint Shop Pro

www.jasc.com

to view the image.

If you are importing a USA USGS DRG map with just a tfw file and the map image name is in the

standard USGS format (example O43107C4.TIF) then OziExplorer will work out the correct UTM

Zone number to use from the file name and put it in the Zone field of the DRG Import Options

dialog as the default.

Hemisphere

- Select the correct Hemisphere (North or South of the equator).

Always Ask

- if checked this dialog will be shown for each map imported, if unchecked the

parameters entered into the dialog will be assumed to apply to all maps.

Map Projection

- Select the map projection which matches the projection of the map you are

importing. If it is unknown, it is often provided on the map image. You will need to open the map in

a paint program (see above). Some projections are not supported. Some projections require

additional parameters (an example is Lambert Conformal Conic), the Projection Setup dialog will

popup for you to enter these parameters.

Not all tfw files have the data values exactly as OziExplorer expects, so not all maps can be imported

correctly with just the tfw file.

Converting Geotiff Image Files from 24 bit color to 8 bit.

Note : OziExplorer can read both 24 bit and 8 bit tif images and both formats are paged in as

required.

If a 24 bit image is converted to 8 bit color the Geotiff georeference information is lost.

This document describes a technique to save the georeference information and to then put it back

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