viernes, 29 de noviembre de 2013

NASA: USA - Yosemite Valley and the Rim Fire Burn Scar - 11.29.13

Yosemite Valley and the Rim Fire Burn Scar
acquired September 16, 2013 download large image (9 MB, JPEG, 5400x3600)
acquired September 16, 2013 download GeoTIFF file (41 MB, TIFF) 
From above, Yosemite National Park’s majestic granite peaks and deep valleys are a jumble of light and dark. In fact, this section of the Sierra Nevada is known as the range of light because of the white color of the peaks, and the name holds true from space. Dark green forests and shadows fill in the lower elevations, providing contrast.
At first glance, it might appear that the range takes a turn to the northwest in this image, which was acquired by the Operational Land Imager (OLI) on the Landsat 8 satellite on September 16, 2013. The landscape in the upper left quadrant is gray and brown, though its color comes from ash and charcoal rather than granite. This is land that was burned in the Rim Fire. The boundary between burned and unburned land is difficult to see in the true-color view (though it would be very stark in a false-color infrared). External maps of the burn area make it easier to see where the fire burned. (For more tips on interpreting true-color satellite images, see How to interpret a satellite image: Five tips and strategies.)
The Rim Fire started on August 17, 2013, in the Stanislaus National Forest, west of Yosemite National Park. The fire burned more than 255,000 acres, 77,254 of which were in the park. By September, the smoke had cleared, the embers cooled, and firefighters and their equipment were all gone. And yet the image represents the beginning, not the end of the disaster for managers of Yosemite and Stanislaus.
Though the fire was extinguished, conditions were initially too dangerous in many places for managers to assess the damage and plan a recovery. Satellite images like this one provide some indication of the severity of the burn. Badly burned land is prone to erosion and flooding (particularly on steep slopes or near rivers or streams), affecting water quality and safety. Burned trees near roads and trails also pose a safety hazard.
For the Rim Fire, the Burn Area Emergency Response team determined that the biggest hazards were related to erosion, flooding, and trees. They also worried about the potential for invasive species and damage to cultural sites. To recover from the fire, they recommended that the park service clean culverts to increase their capacity to hold extra runoff. With plants and trees gone, water more easily runs off into waterways, carrying loose, unanchored soil. They recommended that sandbags be placed around buildings near the Hetch Hetchy Dam and the entrance station; that trails and roads be cleared of fallen trees and hazardous trees be removed; that warning signs be placed in burned areas; and that cultural sites be stabilized from erosion or flood damage. Finally, the response team warned of the potential for invasive species to take hold in the recovering ecosystem, as firefighters from across the country were digging up the ground and potentially dropping foreign seeds.
  1. References

  2. NASA Earth Observatory (2013, November 18) How to interpret a satellite image: Five tips and strategies. Accessed November 22, 2013.
  3. NASA Landsat (2013, February) Burning wildlands and a burning need for Landsat. Accessed November 22, 2013.
  4. Yosemite National Park (2013, September) Yosemite NP Rim fire 2013 burned area emergency response plan. Accessed November 22, 2013.
NASA Earth Observatory images by Robert Simmon, using Landsat 8 data from the USGS Earth Explorer.
Landsat 8 - OLI

NASA: USA - Yosemite Valley and the Rim Fire Burn Scar - 11.29.13

Ricardo M Marcenaro - Facebook

Blogs in operation of The Solitary Dog:
Solitary Dog Sculptor:
Solitary Dog Sculptor I:

comunicarse conmigo,
enviar materiales para publicar,
propuestas comerciales:
contact me,
submit materials for publication,
commercial proposals:

Diario La Nación
Cuenta Comentarista en el Foro:

My blogs are an open house to all cultures, religions and countries. Be a follower if you like it, with this action you are building a new culture of tolerance, open mind and heart for peace, love and human respect.

Thanks :)

Mis blogs son una casa abierta a todas las culturas, religiones y países. Se un seguidor si quieres, con esta acción usted está construyendo una nueva cultura de la tolerancia, la mente y el corazón abiertos para la paz, el amor y el respeto humano.

Gracias :)

No hay comentarios:

Publicar un comentario