NPP VIIRS Geolocation Approach Evaluation

1
 NPP VIIRS Geolocation Approach Evaluation

• Robert Wolfe PI Mash Nishihama Co-IRaytheon
  ITSS at NASA/GSFC Code 922
• Nov 4-6, 2003 

2
EDR/CDR List

• VIIRS Geolocation is a Sensor Data Record (SDR)
• Geolocation indirectly contributes to many VIIRS
  EDRs and CDRs
• Accuracte geolocation is needed
• to meet EDR mapping uncertainty specifications
• to support land cover change detection
• for accurate retrieval of biophysical parameters
  over heterogeneous land surfaces (VI, etc.)
• to maintain mapping accuracy in multi-day CDRs
• Geolocation accuracy specifications goals
  needed to generate CDRs are not well defined
• We need input from NASA NPP science team to
  better define them

3
Roles of PI and Co-I

• Both PI and Co-I will carry out the data analysis
  and algorithm reviews
• Robert Wolfe PI
• Primary experience MODIS Geolocation Lead and
  Land Science Team Support Lead
• Specific role
• Understand requirements and goals for VIIRS CDRs
• Work operations concept and calibration/validation
  plans
• Review and publish results
• Mash Nishihama Co-I
• Primary experience MODIS Geolocation Scientist
• Specific role
• Develop and generate proxy data
• Develop Kalman filter

4
Approach (for VIIRS)
Role
Activity

• Review the parametric model RW MN
• Review pre-flight error analysis RW MN
• Evaluate the ancillary data RW MN
• Evaluate results from pre-flight
  characterization RW MN
• Review the pre-flight simulation data RW MN
• Understand EDR/CDR geolocation RW requirements
  and goals
• Develop a Kalman filter for operational MN
  long-term trend analysis
• Present status and publish results RW

RW Robert Wolfe
MN Mash Nishihama
5
Resources Offered/Requested

• Offered
• Updated MODIS ground control point library
• currently 440 control points extracted from 121
  precision located Landsat scenes
• MODIS data as proxy data with VIIRS scanning
  geometry
• geolocation errors can be introduced to study
  impacts on EDRs and CDRs
• will not do any radiometric (or spectral)
  remapping
• Requested
• Access to Geolocation Error Analysis Details
• Access to pre-flight geometric characterization
  data and analysis
• Access to simulated and proxy data, algorithms
  and evaluation tools
• Reports back from NASA NPP science team on
  impacts of geolocation accuracy (based on proxy
  data) on downstream products

6
Contribution to Deliverables

• Review geolocation algorithm analysis reports
• Review and update Cal/Val plan in geolocation
  area
• Contribute to operations concept in the area of
  geolocation long-term error analysis