Tuesday, April 7, 2015

Landsat Band combinations for highlighting Earth features

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Following are the band combinations for highlighting earth features for Landsat Images.
 Agriculture: Highlights agriculture in bright green. Bands 6,5,2
 Natural Color: Sharpened with 25m panchromatic band. Bands 4,3,2+8
 Color Infrared: Healthy vegetation is bright red. Bands 5,4,3
 SWIR (Short Wave Infrared): Highlights rock formations. Bands 7,6,4
 Geology: Highlights geologic features. Bands 7,4,2
 Bathymetric: Highlights underwater features. Bands 4,3,1
 Panchromatic: Panchromatic image at 15m. Band 8
 Vegetation Index: Normalized Difference Vegetation Index (NDVI). (Band5-Band4)/(Band5+Band4)
 Moisture Index: Normalized Difference Moisture Index (NDMI). (Band5-Band6)/(Band5+Band6)

Further Details:  Identifying land use and land cover(LULC) features using band rationing technique

Friday, March 22, 2013

First Image of Earth from LandSat 8

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The LDCM/LandSat 8, which is launched from Vandenberg Air Force Base on February 11, 2013 is started   to send Earth’s picture to the ground from the space. This week, the Landsat Data Continuity Mission (LDCM) released its first images of Earth, collected at 1:40 p.m. EDT on March 18.LDCM is performing as planned and everything is on track for a May operational transition. LDCM is a joint mission of NASA and the Department of Interior's U.S. Geological Survey.

According to NASA website, LDCM’s first instrument, Operational Land Imager, or OLI instrument, that took the natural color image. The natural color image showed the landscape in the colors our eyes would see, but Landsat sensors also have the ability to see wavelengths of light that our eyes cannot see. LDCM sees eleven bands within the electromagnetic spectrum, the range of wavelengths of light. OLI collects light reflected from Earth's surface in nine of these bands. Wavelengths on the shorter side include the visible blue, green, and red bands. Wavelengths on the longer side include the near infrared and shortwave infrared. LDCM's second instrument, the Thermal InfraredSensor (TIRS) detects light emitted from the surface in two even longer wavelengths called the thermal infrared. The intensity of the emitted light at the longer wavelengths measured by TIRS is a function of surface temperature.

Friday, February 8, 2013

Watch Online NASA Launching New Satellite: LDCM/Landsat 8

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Today, February 11, the next Landsat (LDCM/Landsat 8 http://ldcm.nasa.gov) will be launched from Vandenberg Air Force Base at 1802-1850 GMT .

The launch of LDCM is scheduled for just over 90 minutes.Click the following link to watch NASA HD stream of LDCM launch.

If you are interested in watching it will be streamed on NASA Internet TV (see http://www.nasa.gov/multimedia/nasatv/schedule.html).   Also see at http://www.spaceflightnow.com/tracking/ for space flights information.

 “The data from Landsat spacecraft constitute the longest record of the Earth's continental surfaces as seen from space.  With the launch of the LDCM on Monday, February 11, the record will be continued and enhanced, providing data intrinsic to our geographic and Earth system science research.  Since 1972,

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