USGS - science for a changing world

Earth Observing 1 (EO-1)

Frequently Asked Questions



General
1 - What is EO-1's orbit?
2 - What is the geographic coverage of an ALI or Hyperion scene?
3 - What does the browse represent for ALI and Hyperion?
4 - What is the entity ID naming convention?

DAR
5 - How many Data Acquisition Requests (DARs) does the spacecraft image daily?
6 - What are the off-nadir pointing capabilities for EO-1 DAR collections?
7 - When does distortion become a significant factor in off-nadir versus nadir collects?
8 - What is the geographic length of an EO-1 DAR collection?

Data Products
9 - Are there restrictions for the use of EO-1 data?
10 - What if there is no data in the archive for my area of interest?
11 - What are the bands and spectral ranges for Hyperion data?
12 - What product formats are available for Hyperion?
13 - What are the differences between the earlier Thompson Ramo Woolridge (TRW) products and the new USGS Hyperion products?
14 - What are the files contained in an ALI Level 1 product?
15 - What are the bands and spectral ranges for ALI?
16 - Why are there 4 image data files within the Level 1 ALI product?
17 - What product formats are available for ALI?
18 - What are known ALI anomalies?

Data Conversion
19 - How are the radiance values (L) determined within the Hyperion bands?
20 - What is the signal-to-noise ratio (SNR) for Hyperion?
21 - How do you convert radiance to reflectance?
22 - What is the flag mask?
23 - What is the signal-to-noise ratio (SNR) for ALI?
24 - What is the conversion to get from ALI Level 1 to a Level 0?

Data Import
25 - What does it mean when my data has a .tar.gz or .tgz extension?

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URL: http://eo1.usgs.gov/faq.php
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Page Last Modified: October 14, 2009