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Moving Map Options

BSB Calibration

What is a Map

A map in OziExplorer is an image of a map which has been calibrated (georeferenced) so

OziExplorer can use any pixel position on the map to determine the true geographic position. When

you calibrate a map OziExplorer creates a .map file which contains the calibration information and a

link to the image you are using.

The other method of creating maps is to import them. There are maps and charts available in digital

form which have the calibration (georeferencing) for the map included either directly in the file or

provided as information in an additional file. Importing these maps reads the calibration information

from the map files and creates an OziExplorer map file.

Creating the Image File

Where do you obtain the map images from

you can obtain them from 3rd parties who have

produced them in digital form as images or you can scan them yourself.

To create your own maps you need access to a scanner.

Scan the maps at or about 125 to 200 dpi (dots per inch) and 256 colors. The dpi can be modified to

suit your requirements but the colors should always be 256 unless you have some other reason for

changing this.

The amount of control you have for setting these parameters depends on your scanner and its

software.

If you are using an unregistered version which only uses a 2 point calibration method you must scan

the map with the latitude lines running exactly horizontal. If using the registered version it is not

critical to have the scanned image perfectly aligned with the grid lines as a rotated image can be

handled by a multipoint calibration using 3 or more points.

Save the scanned image as a BMP file, this is the only type of map image supported in the shareware

version. The registered version also supports TIF, JPG, PNG and other formats.

You need to know the latitude and longitude of at least 2 points on the map, preferably near opposite

corners of the image.

From the

File Menu

select the

Load and Calibrate Map Image

option.

Give the map a name.

If using a Registered version you can specify the Datum for the Map. The Datum should be written

somewhere on the map from which the scan was taken, otherwise you must determine the datum

from other sources.

What Calibration Method to Use

The calibration method to use depends on the map projection.

The unregistered version is limited to using

2 calibration points

and as stated above the

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