Landsat Data Continuity Mission PreSolicitation Conference Data Specification

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Landsat Data Continuity MissionPre-Solicitation
ConferenceData Specification
James R. Irons, Ph.D LDCM Study Scientist
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Data Spec and the Formulation Phase RFP

• The LDCM Data Specification to be released with
  the Formulation Phase RFP will be the 4th version
• The first version was posted in Nov., 00 and
  reviewed at the First LDCM Workshop in Jan., 01
• The second version was posted in April, 01 and
  reviewed at the Second LDCM Workshop in April,
  01
• The third version was released with the Draft RFP
  in August, 01

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Sec. 2 LDCM Data and Data Products

• Specifies archival of unprocessed LDCM data
• Specifies production of unenhanced LDCM data
  products
• Level 0 - unprocessed LDCM digital image data
• Level 1 - preprocessed LDCM digital image data
• Changes
• Clarified that specifications applied for life of
  the LDCM
• Deleted specification that prohibited pixel
  resampling or averaging to create Level 1R
  product
• Specified Level 1 image grid orientation options
• North up
• WRS-2 path

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Data Granule

• The term granule is a generic description for a
  digital image that can be inventoried or ordered.
  A granule will typically have attributes
  associated with it, e.g., id, size (MB), Date,
  Time, etc.

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Sec. 3 Spatial Coverage and Temporal Resolution

• Specifies average daily archival of at least 250
  WRS-2 scenes per day
• Specifies an archive-driven data acquisition
  strategy affording global coverage of the Earths
  land surfaces on a seasonal basis
• Specifies coverage of the 50 United States at
  least once every 16 days
• Changes
• Deleted reference to International Cooperators

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Sec. 4 Spectral Bands

• Specifies heritage spectral coverage minus
  thermal band
• Band edges refined to avoid atmospheric
  absorption features
• Changes
• Clarified option for using a red spectral band
  for the panchromatic band

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Sec. 5 Spatial Resolution

• Specifies heritage ground sampling distances
• 15 m panchromatic band
• 30 m reflective bands
• Specifies edge response and aliasing for Level 1R
  digital image data
• Changes
• Clarified that edge response and aliasing
  specifications applied to Level 1R digital image
  data

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Sec. 6 Radiometry

• Specifies an uncertainty of less-than-or-equal-to
  5 for at-aperture spectral radiance for Level 1
  digital image data
• Specifies signal-to-noise ratios and dynamic
  range
• Specifies pixel-to-pixel radiometric uniformity
  in Level 1 data
• Changes
• Relaxed pixel-to-pixel uniformity specification
  for panchromatic band
• Clarified definition of coherent noise

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Sec. 7 Image Geometry, Geolocation, and
Cartographic Registration

• Specifies spectral band-to-spectral band
  registration accuracy
• Specifies image-to-image registration accuracy
• Specifies geodetic accuracies for Level 1G data
  products

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Sec. 8 Thermal Band Option

• Specifies two thermal bands for a design and cost
  option study
• Changes
• Changed ground sampling distance requirement from
  60 m to 120 m
• Changed dynamic range to bring minimum above 0
  Kelvin

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Sec. 9 Reflective Band Options

• Specifies two reflective spectral bands for
  design and cost option studies
• A band center at 443 nm (30 m GSD) for coastal
  zone studies
• A band center at 1375 nm (120 m GSD) for cirrus
  cloud detection and correction

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Technical and Cost Drivers

• The Formulation Phase Statement-of-Work requires
  the formulation phase contractor(s) to identify
  any technical cost-drivers in the LDCM
  requirements and recommend refinements,
  modifications and technical options that would
  make the implementation of LDCM more cost
  effective