Photographic Identification: P-45243 Mount Everest
These are two comparison images of Mount Everest and itssurroundings, along the border of Nepal and Tibet. The peak of Mount Everest, the highest elevation on Earth at 8,848 meters (29,028 feet), can be seen nearthe center of each image. The image at the top was acquired through thick cloud cover by the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) aboard the space shuttle Endeavour on April 16, 1994. The imageon the bottom is an optical photograph taken by the Endeavour crew under clearconditions during the second flight of SIR-C/X-SAR on October 10, 1994. Bothimages show an area approximately 70 kilometers by 38 kilometers (43 miles by24 miles) that is centered at 28.0 degrees north latitude and 86.9 degrees eastlongitude. North is toward the upper left. The colors in the radar imagewere obtained using the following radar channels: red represents the L-band, HH(horizontally transmitted and received) channel; green represents the L-band, HV(horizontally transmitted and vertically received) channel; blue represents the C-band, HV (horizontally transmitted and vertically received) channel. Radar illumination is fromthe top of the frame. The optical photograph has been geometrically adjusted to better match the area shown in the radar image. Many features of theHimalayan terrain are visible in both images. Snow covered areas appear whitein the optical photograph while the same areas appear bright blue in the radarimage. The radar image was taken in early spring and shows deep snow cover,while the optical photograph was taken in late summer and shows minimum snow cover. The curving and branching features seen in both images are glaciers. The two wavelengths and multiple polarizations of the SIR-C radar are sensitive to characteristics of the glacier surfaces that are not detected by conventional photography, such as the ice roughness, water content, andstratification. For this reason, the glaciers show a variety of colors in theradar image (blue, purple, red, yellow, white) but only appear as gray or whitein the photograph. Field data from other SIR-C/X-SAR test sites, such as theAlpine glaciers of Austria, are being used to help interpret data from remoteregions like Mount Everest.
![[MT. EVEREST]](MEVEREST.GIF)