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.Back to Earth Observing One (EO-1)
| 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
Below are other science projects associated with this product.
USGS EROS Archive - Earth Observing One (EO-1)
10- to 30-meter multispectral and hyperspectral data from the Earth Observing-1 (EO-1) Extended Mission. (2000 to 2017)
- Overview
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.Back to Earth Observing One (EO-1)
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 darkOutput 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 dataRatio.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 lowerSeptember 28, 2001
Pamela Barry, 310-813-5438
HYPER.01.800.001 - Science
Below are other science projects associated with this product.
USGS EROS Archive - Earth Observing One (EO-1)
10- to 30-meter multispectral and hyperspectral data from the Earth Observing-1 (EO-1) Extended Mission. (2000 to 2017) - Web Tools