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anthonyw

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About anthonyw

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    Undergraduate

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    California
  1. Thanks for the response. I have calculated LST three ways: 1. Uncorrected at-satellite 2. Corrected temperature via Atmospheric Correction Parameter Calculator and radiative transfer equation 3. The Jimenez-Sobrino (2003) single-channel method. I have estimated emissivity using the NDVI Thresholds method as per Sobrino et al. 2004. For the Atmospheric Correction Parameter Calculator, I tried a number of different options to see how upwelling and downwelling radiance and atmospheric transmittance would be affected. I tried it with and without surface conditions, with and without
  2. Update: I was just reviewing some literature and noticed similar results (Yang and Wang, 2002; www.ltrs.uri.edu/research/LST_page/paper4.doc‎). Their uncorrected at-satellite temperatures were also significantly higher than station-based readings. Their research was conducted very close to my study area. Am I fundamentally misunderstanding something about comparing satellite-estimated LST with station measurements? My recollection from literature is that multiple studies have done this and errors are usually rather small, and I don't recall reading that anything special need be done when
  3. Update: I found another station in my study area. The at-satellite temperature there is also about 7 degrees higher than the instrumental LST. I also just tried a Landsat image from a different date. I'm seeing more or less the same problem: at-satellite temperature is about 7 degrees too high at both stations. I'm perplexed here, and I'm quickly running out of ideas. Anyone have any ideas? Also, this is where I read that image acquisition times are in GMT: http://landsat.usgs.gov/acquisition_time_for_an_image.php
  4. Hello All, I am trying to estimate land surface temperature (LST) from Landsat 5 data. The study area is on the East coast in the US, and luckily it includes a temperature station with hourly data on the day the satellite passed. I've converted DN5 to radiance and used an inversion of Planck's to calculate brightness temperature-- this is all pretty standard stuff. Here's my problem: The uncorrected at-satellite brightness temperature at the temperature station location is about 7 degrees F higher than the station measured at the temperature station. My general understanding is that th
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