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Earth Observing 1 (EO-1)

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    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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    Page Last Modified: December 13, 2011