The following 5-by-5 matrix represents the 25 2-kilometer-square areas within the 10-kilometer-square AREA 54,375 whose SW (SouthWest) corner has NAD83UTM coordinates: 5 40 000 E 37 50 000 N . Clicking on the black link in a matrix element initiates the download of the USGS aerial photograph of the corresponding 2-kilometer-square area. Each 2-kilometer-square area is represented as a 2-by-2 array of JTNP tiles each of which is an aerial photograph of a 1-kilometer-square area. Each JTNP tile has been composed by coalescing in Adobe Photoshop a 5-by-5 array of USGS tiles each of which is an aerial photograph of a 200-meter-square area. Each array download may take a few minutes. To provide orientation, some of the 2-kilometer-square areas are colored green and labelled with the name of a prominent feature contained in the area. The names of camping/hiking/climbing features are printed in blue , while names of cultural units are printed in red . If the name of a feature in an area is displayed as a Blue Link or as a Red Link then clicking on that link causes the downloading of the aerial photograph to be accompanied by scrolling intended to make the named feature immediately visible within the Explorer window.