Data Files Conventions (Discussion) May 2006 Peter Schroeder UC-Berkeley

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Presentation transcript:

Data Files Conventions (Discussion) May 2006 Peter Schroeder UC-Berkeley

Metadata Why we are using the ISTP-compliance standard – –Constitute minimum acceptable metadata standard Global Attributes –"Project" { "ISTP>International " - "Solar-Terrestrial Physics" }."Project" –"Source_name" { "GEOTAIL>Geomagnetic Tail" }."Source_name" –"Discipline" { "Space Physics>Magnetospheric Science" }."Discipline" –"Data_type" { "K0>Key Parameter" }."Data_type" –"Descriptor" { "EPI>Energetic Particles" - " and Ion Composition" }."Descriptor" –"Data_version" { "1" }."Data_version" –"Logical_file_id" { "GE_K0_EPI_ _V01" }."Logical_file_id" –"PI_name" { "D. Williams" }."PI_name" –"PI_affiliation" { "JHU/APL" }."PI_affiliation" –"TEXT" { "reference to journal article, URL address" }."TEXT" –"Instrument_type" { "Magnetic Fields (space)" }."Instrument_type" –"Mission_group" { "Geotail" }."Mission_group" –"Logical_source" { "GE_K0_EPI" }."Logical_source" –"Logical_source_description" { "Geotail Magnetic Field Key Parameters" }."Logical_source_description"

More on the ISTP Standard Variable Attributes –"SW_P_Den” –"CATDESC" CDF_CHAR { "Ion number density (Solar Wind " - "Analyzer), scalar" } –"DEPEND_0" CDF_CHAR { "Epoch" } –"DICT_KEY" CDF_CHAR { "density>ion_number“ } –"DISPLAY_TYPE" CDF_CHAR { "time_series" } –"FIELDNAM" CDF_CHAR { "Ion Number Density (CPI/SWA)" } –"FILLVAL" CDF_REAL4 { -1.0e+31 } –"FORMAT" CDF_CHAR { "f8.3" } –"LABLAXIS" CDF_CHAR { "Ion N" } –"UNITS" CDF_CHAR { "#/cc" } –"VALIDMIN" CDF_REAL4 { 0.01 } –"VALIDMAX" CDF_REAL4 { } –"VAR_NOTES" CDF_CHAR { "Assuming no helium (0.3 - several " - "hundred) if the density is less than " - "0.3/cc the higher moments (VEL,TEMP) " - "shall not be used because of the poor " - "counting statistics." } –"VAR_TYPE" CDF_CHAR { "data" }.

Metadata Status for STEREO Data Products PLASTIC and IMPACT have both committed to providing ISTP-compliant CDF’s for basic science products S/WAVES? Will there be higher level products? How will metadata be captured? SECCHI products? What kinds of metadata make sense?

Mapping to SPASE Basis for VHO API “The SPASE data system is a model for scientific data systems. It is based on the latest web-based technologies and is designed to be a distributed data systems with a heterogenous mix of platforms and systems.” SPASE website: ACE Example: Essentially, a dictionary for constructing search queries so that everyone is “talking the same language” Work ongoing to improve SPASE for particle data

More on File Conventions ssc.nascom.nasa.gov/intranet/software_telecon/ /telecon_2005_04_20.txthttp://stereo- ssc.nascom.nasa.gov/intranet/software_telecon/ /telecon_2005_04_20.txt Do we want uniform file naming conventions? Standard convention doesn’t really seem to work for IMPACT: STA_L01_PLASTIC_ _V02.CDF Need ability to reflect subproducts for IMPACT: STB_L1_SWEA_DISB_ _V01.cdf