Coordinate Systems

There are two different coordinate systems that you may use in SOS Explorer® Tours: screen coordinates and map coordinates.

Screen coordinates are used to position text boxes, images, and videos on screen.

The coordinate system is defined in terms of a percentage of the screen dimensions so that both the x- and y-positions are between 0 and 100 regardless of the size or aspect ratio of your screen. The origin, (0, 0), is at the bottom-left corner of the screen. Objects are positioned so that their center sits at the defined point.

A text box placed at position (10, 10), for example, would appear in the bottom-left corner of the screen. An image placed at (50, 50) would be centered on the screen. And a video positioned at (90, 80) would appear at the top-right of the screen.

SOS Explorer® uses an equatorial cylindrical equidistant projection. This means you can simply treat values of longitude as x-coordinates ranging from -180 to +180, and values of latitude as y-coordinates ranging from -90 to +90. The origin, (0, 0), is at the center of the map.