USGS EROS Archive - Earth Observing One (EO-1) - Differences Hyperion Data Sets

Differences Between Level 1 and Level 1A Hyperion Data Sets

This correspondence tabularizes in Table 1 the difference between the Level 1 and the Level 1A Hyperion output denoted by a .L1 and .L1_A extension respectively. An updated calibration file was released simultaneously with the release of the upgraded processing system. This correspondence also tabularizes the difference between the two calibration files.

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Table 1: L1 and L1_A Comparison
	L1	L1_A
Calibration file	HypGain	HypGain_revA
Dark Subtraction	Dark closes in time	Interpolate in time to estimate the dark for each frame by using the pre- and post image dark
Output Format	Unsigned integer	Signed integer
VNIR Scale Factor (Bands 1-70)	100	40
SWIR Scale Factor (Bands 71-242)	100	80
Reporting of Saturated Pixels	none	Creation of log file
Echo Correction File	Ratio.txt	Ratio_revA.txt

Table II: Calibration File Comparison
	HypGain	HypGain_revA
Pre-Flight Calibration Set	Collected July 1, 1999	Collected July 1, 1999
Pre-Flight Dark Subtraction	Dark file plus offset to balance scattering signal	Dark file
Echo Correction File used on Pre-Flight data	Ratio.txt	Ratio_revA.txt
On-orbit pixel-topixel correction	Based on Day 047 solar calibration event	Based on Day 047 solar calibration event
Overlap adjustment	None	Used Day 047 solar profile to match overlap region

	HypGain	HypGain_revA
Calibrated VNIR : bands (nm)	9-57 (437-925)	5-57 (400-925 )
Calibrated SWIR: bands (nm)	75-225 (890-2400)	75-225 (890-2400)
Total number of Calibrated bands	200 (4 overlap)	204 (4)
Number of Unique calibrated bands	196	200
Impact to user		Improved overlap agreement. Radiance generally 1% lower. Radiance lower than more than 1% for the region below 550 nm and between 900 nm – 1100 nm is lower

September 28, 2001
Pamela Barry, 310-813-5438
HYPER.01.800.001

USGS EROS Archive - Earth Observing One (EO-1) - Differences Hyperion Data Sets

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