[GOES][Landsat MSS][Landsat TM][WiFS][Digital Camera]
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Landsat TM Images (1982 to present) |
Landsat TM Characteristics
Spatial Resolution | 30 m | |
Spectral Resolution | 3 visible 1 NIR 2 mid-IR |
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Temporal Resolution | 2 weeks |
Image group 5: Online date, 21 February 2001
A digital image map mosaic was generated using twelve Landsat TM images collected during the summer of 1997 (eight images were collected in June, three on July 15th, and one on May 21st). The 1997 digital image mosaic (shown on the left) represents land surface conditions during a dry season in a dry year. The data are being used to compare with a digital image mosaic generated using 1992 Landsat TM images which represents land surface conditions during a wet season in a wet/El Niño year. The wet year image mosaic was generated using Landsat TM images collected during April 1992. Figure 1 (lower left) shows the regional rainfall for for a portion of the Southwest from 1992 and 1997, (600 x 800, 40 kilobytes). Besides using the Landsat TM image mosaics to generate digital change images, which help with several issues including those dealing with vegetation change and the transport of fine sediments, we are also using the image maps to extract information about soil types, vegetation cover, and surface armouring/protection. The spatial resolution of the mosaics is 30 meters. Landsat TM bands 2, 4, and 5 were used to generated the color composite shown on the left. In order to better show the land surface information in both bright and dark regions on a single product, a large spatial filter was applied to the data. Click the 1997 Landsat TM image mosaic thumbnail image (upper left) to view the mosaic at higher resolutions. |
Image group 4: Online date, 22 February 1999
Landsat TM 2-3-4 False Color Composite Kelso Dunes Area (600 x 691, 740 kilobytes) |
Landsat TM 2-3-4 False Color Composite Laughlin, Nevada Area (600 x 691, 780 kilobytes) | Click one of the thumbnails to view a pair of images collected on two different dates: 19 April 1992 and 20 June 1997. The images are animated, alternating (blinking) between the pair, to better visualize where vegetation and other surface changes have occured. Viewing images in this manner allows one to easily see changes between the two dates.
The blink animations require a JavaScript capable/enabled browser, such as Netscape or MS Internet Explorer versions 3.0 and higher. Contact webman@TerraWeb.wr.usgs.gov for help or comments. |
Image group 2: Online date, 12 August 1998
Landsat TM 2-4-5 False Color Composite 20 June 1997 (732 x 688, 336 kilobytes) |
Landsat TM Eolian Erosion Vulnerability Image Map 20 June 1997 (732 x 688, 283 kilobytes) | Click one of the thumbnails to view an 10x compressed overview image and access full resolution images of subareas of particular interest. Click on the Blink button to view a 10x compressed image pair: the false color composite and the eolian erosion vulnerability image map of the region. The images will be animated, alternating (blinking) back and forth between the pair. Viewing images in this manner allows one to easily compare vulnerable areas (yellow tones in the map) with the false color composite.
The blink animations require a JavaScript capable/enabled browser, such as Netscape or MS Internet Explorer versions 3.0 and higher. Contact webman@TerraWeb.wr.usgs.gov for help or comments. |
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