Analysis of Doppler Radar Datasets
description
Transcript of Analysis of Doppler Radar Datasets
Analysis of Doppler Radar Datasets
L. Jay Miller (September 2009)
Gridding and Wind Synthesis
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EOL/RSF Project
• “Unfreeze” legacy software• REORDER – NCAR/ATD/FOF (Dick Oye)
• SPRINT – NCAR/MMM (Carl Mohr and L. Jay Miller)
• CEDRIC – NCAR/MMM (Carl Mohr and L. Jay Miller)
• PPI_MMM – NCAR/MMM (Carl Mohr and L. Jay Miller)
• Other contributors: Michele Case (ATD/FOF)Bill Anderson (MMM)Sherrie Fredrick (MMM)
• History of software• SPRINT – Late 1970s (NHRE)
• REORDER – Mid 1980s (ELDORA)
• CEDRIC – Late 1970s – Early 1980s (NHRE and CCOPE)
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EOL/RSF Project cont’d
• Evaluate gridding software
• Recommendations for future
• Establish single repository
• Include legacy software
• Document efforts with Wiki website
• Knowledge transfer and document usage
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Comparison of Reorder and Sprint
REORDER SPRINT
SCHEME:DISTANCE-WEIGHTING BI-LINEAR INTERPOLATIONCLOSEST POINT CLOSEST POINT
REGION OF INFLUENCE:USER-SPECIFIED RADII LOCALLY ADAPTIVEXYZ ORIENTED RAE ORIENTED
CONSEQUENCES:CONSTANT LINEAR SCALE UNEQUAL LINEAR SCALEUNEQUAL ERROR CONSTANT ERROR
GROUND-BASED (AIRBORNE) OUTPUT GRID ORIENTATION:
USER SPECIFIES + X AZIMUTH USER SPECIFIES + X AZIMUTH(USER-SPECIFIES + X AZIMUTH) (+ X – OUT RIGHT SIDE)
(+ Y – FLIGHT DIRECTION)(ROTATE TO SPECIFIED + X AZIMUTH)
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Common Characteristics
• Read DORADE and Universal formats• DB Fields Linear Interpolate DB Scale• Radial velocity interpolation includes
local unfolding • Output CEDRIC pure binary files
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Sprint-Reorder Interpolation Regions
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Airborne Grid Orientations
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Analysis Flow Chart for COPS
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reorder_dows
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Parts of run_cedsyn
• Part 1 (BEGIN): Basic framework for processing single radar dataset
• Part 2 (FIL_GRAF): Define block used reading/massaging/graphing single radar
• Part 3 (SYNUVW): Define block used for synthesis, creating additional fields, graphing, and writing these final results
• Part 4 (PATCHER): Commands for additional filling of fields
• Part 5 (FILTER): Commands for filtering and creating new fields
• Part 6 (COMPARE): Commands for comparing input and output fields
• Part 7 (FINISH): Commands for finishing and writing synthesis output
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Part 1: run_cedsyn (BEGIN)
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Part 2: run_cedsyn (FIL_GRAF)
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Part 3: run_cedsyn (SYNUVW)
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Part 4: run_cedsyn (PATCHER)
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Part 5: run_cedsyn (FILTER)
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Part 6: run_cedsyn (COMPARE)
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Part 7: run_cedsyn (FINISH)
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Some Relevant Websites
• EOL/RSF PROJECT WIKI: https://wiki.ucar.edu/display/raygridding/Home
• CEDRIC DOCUMENTATION: http://www.mmm.ucar.edu/pdas/Documentation
• PURE BINARY FILE DESCRIPTION: http://www.mmm.ucar.edu/pdas/Documentation/appendix-D.ps
• WIND SYNTHESIS MATH: http://www.mmm.ucar.edu/pdas/Documentation/appendix-F.ps
• AIRBORNE DOPPLER RADAR DATA ANALYSIS WORKSHOP (2000)http://www.mmm.ucar.edu/pdas/ATD-workshop/atd-lecture.html