The ALT tag is used in both the status and statusmap CGIs. Coordinates should be given in positive integers, as the correspond to physical pixels in the generated image. The coordinates you specify here are for the upper left hand corner of the host icon that is drawn. The CGI will automatically calculate the maximum dimensions of the image it creates based on the largest x and y coordinates you specify. Also of note, if you want to create 2-D coordinates for use in drawing the hosts in the statusmap CGI by visually moving hosts around, I would suggest giving David Kmoch's Saintmap addon a spin.
Coordinates can be positive or negative real numbers.
The coordinates you specify here are used as the center of the host cube. Stats Extended service information entries are basically used to make the output from the status and extinfo CGIs look pretty. They have no effect on monitoring and are completely optional. This is a short name of the host associated with the service, as specified in the service definition . This is a description of the service, as specified in the service definition .