Usually satellite images are taken from straight overhead and displayed so that North is toward the top. Such a maplike view allows us to calculate distances in the image according to a fixed scale, for example 1 cm on the paper equals 100 km on the land or ocean. But this poster is not a usual satellite image. To provide a better representation of cloud heights, this poster was created with a viewpoint that is not straight above Hurricane Fran (see "How was this image created?" above left). Such a view, though more natural looking, makes it impossible to simply calculate distances according to a fixed scale because objects close to your viewpoint appear larger than objects far away. This is demonstrated in the picture below. The picture shows the same image as on the front of the poster, but with an added grid that runs North/South and East/West through the center of Hurricane Fran. Each box in the grid is 50 km x 50 km. If we looked straight down on the grid it would look like a series of squares - just like a tiled floor. But the perspective view makes the grid look slanted and makes each box look like a diamond shape. The perspective view also makes the nearest boxes (in the lower right corner) look larger than the boxes farther away (over Florida, for example). Find a room with a tiled floor and stand in one corner. The tiles at your feet look larger than the tiles in the far corner of the room. But you can count the number of tiles anywhere in the room to "measure" how big the room is. Likewise you can count the 50 km X 50 km grid boxes in the picture below to "measure" the size of anything in the picture.