========================================================================== MODIS MOD17 L4 Tile 1-KM Gridded PRODUCT: PSN (First-of-Year Initialization, daily) Revision 5.2.3 Revised: Sat Apr 01 15:01:00 MST 2006 Petr Votava Revised: Thu Mar 23 11:10:00 MST 2006 Maosheng Zhao Revised: Thu Feb 17 15:20:00 MST 2006 Maosheng Zhao Revised: Thu Oct 06 15:26:00 MST 2005 Maosheng Zhao Revised: Mon Jun 20 17:26:00 MST 2005 Maosheng Zhao Revised: Wed Feb 16 23:55:00 PST 2005, _PV_ Revised: Wed Oct 30 17:18:06 MST 2002, JMG Lupine Logic, Inc. Revised: Wed Oct 23 11:11:11 PST 2002 Revised: Wed Nov 29 14:17:19 MST 2000 Revised: Fri Mar 10 10:30:02 MST 2000 Revised: Wed Jun 17 13:50:23 MDT 1998 Original: Fri Mar 6 10:53:20 MST 1998 Product Identifier: MOD_PR17A1 PSN 1KM gridded DAILY intermediate temporary product Description: The MOD_PR17A0.exe (PGE 36) annually produces new initialized MODIS AM-1 Level 4 1KM daily temporary intermediate Photosynthesis data product. This product tile is used in the following ways by each of the MOD17 suite of PGEs: PGE Action Performed On MOD17A1 Daily Intermediate Files ---------------------------------------------------------------------- MOD_PR17A0 Writes fresh, zero'ed out copy of MOD17A1 MOD_PR17A1 Reads, writes (updates) existing MOD17A1 MOD_PR17A2 Reads, writes (resets 1) SDS in existing MOD17A1 MOD_PR17A3 Reads, writes (resets 1) SDS in existing MOD17A1 This daily intermediate "updatable" product is NOT ARCHIVED but DOES need to remain "resident" on the production disk/tape system as a temporary intermediate" for the duration of a given processing year. The update and reset schedule for each HFDEOS gridfield in this file is shown below: --------Periodicities------ Measure Units Updated Reset To Zero --------------------------------------------------------------------- Gpp_Daily_1km (kg/m^2 units) daily every 8-days Gpp_Rm_1km (kg/m^2 units) daily annually AnnMax_LeafMass_1km (kg/m^2 units) daily annually AnnSum_Mr_1km (kg/m^2 units) daily annually PsnNetSum_8day_1km (kg/m^2 units) daily annually NOTES ----- --The data type of the AnnSum_Mr_1km has been changed to uint16 from int32 to avoid overflows (v.4.1.0,v4.2.0 and higher...) --Units have been changed to reflect their true scaling as kg/m^2/day values. --The scale factor for the AnnSum_Mr_1km gridfield has been changed to 0.01. --The old N_Yd_Committed [1200x1200] 2D int16 gridfield is now obsolete and has been deprecated. Its function is taken over by the ndays_completed[366] global file attribute. --The ORBITNUMBER and EQUATORCROSSINGTIME,DATE metadata fields have been deprecated. --MOD_PR17A2 (PGE 37) is the MODIS Terra Level 4 1KM 8-day ARCHIVED Photosyntheis data product. The PGE 36 MOD17A1 daily algorithm updates the cumulative (intermediate) tiled products, adding the current data day's PSN measure to each pixel in each given tile. At the conclusion of each 8-day period (indicated via a PGE 37 production rule), the MOD17A2 PGE 37 application takes the PSN values accumulated over the 8-day period, and simply writes these (tiles) out as the official archived 8-day composite" PSN product, MODIS Parameter 3716. NOTE that the same temporal accumulation scheme is used to produce the annual Net Primary Productivity (NPP) product, where the annual NPP product is generated based on cumulative values of the current year's daily intermediate terms (Gpp_Rm_1km, AnnMax_LeafMass_1km, and AnnSum_Mr_1km) terms. The annual NPP product is calculated by PGE 38, producing ESDT MOD17A3, which is MODIS parameter 2703. Versioning: We currently version-stamp our source code, ancillary files and product files with an identical version and release-timedate stamp, called UM_VERSION. Users may extract this version stamp from any product or ancillary file using a command like this: ncdump -h MOD17_ANC_RI10.hdf | grep UM_VERSION. The latest certified codeset carries this version stamp as a global file attribute in the product files, ancillary files, and within the executable: UM_VERSION = "U.MONTANA MODIS PGE36 Vers 5.0.1 Rev 10 Release 02.16.2005 23:59" Point of Contact: Petr Votava (software development) votava@ltpmail.gsfc.nasa.gov Principal Investigator(s): Steven W. Running NTSG Lab, School of Forestry University of Montana Missoula,MT 59812 Email: swr@ntsg.umt.edu Voice: (406) 243-6311 Fax : (406) 243-4510 WWW : www.forestry.umt.edu/ntsg =========================================================================== =========================================================================== A note on MOD_PR17A1 and MOD_PR17 (PSN/NPP) 1KM Level 4, Version 5.0.1 HDFEOS ALGORITHM, ESDT, and FILE designations: PROCESS IDs Status Description PGE ESDT ----------------------------------------------------------------------------- MOD_PR17A0 temporary 1km annual initialization PGE 36 MOD17A1 MOD_PR17A1 temporary 1km intermediate terms GPP-RM etc PGE 36 MOD17A1 MOD_PR17A2 archived 8-day composite PSN at 1KM PGE 37 MOD17A2 MOD_PR17A3 archived Annual NPP at 1KM PGE 38 MOD17A3 ----------------------------------------------------------------------------- ============================================================================ Generic Constructs ECS Metadata Strings: Notes: 1. "FR" is an abbreviation for "FREE_RANGE". 2. "D/T" is an abbreviation for "DATE/TIME" 3. (A) means that multiple values are stored within a single array. 4. A value of "Variable" indicates that this value will vary according to the granule being processed. 5. "M" means class M. 6. (C) means that multiple values are stored as class members. CoreMetadata.0 This string will contain the following PVL fields: # Field Name Data of Value Type Values GROUP = INVENTORYMETADATA GROUP = CollectionDescriptionClass SHORTNAME STRING 1 "MOD17A1" VERSIONID INTEGER 1 5 END_GROUP = CollectionDescriptionClass GROUP = ECSDataGranule SIZEMBECSDATAGRANULE DOUBLE 1 Variable REPROCESSINGPLANNED STRING 1 "further update is anticipated" REPROCESSINGACTUAL STRING 1 "reprocessed" LOCALGRANULEID STRING 1 Variable DAYNIGHTFLAG STRING 1 Variable PRODUCTIONDATETIME D/T 1 Variable LOCALVERSIONID STRING 1 Variable END_GROUP = ECSDataGranule GROUP = PGEVersionClass PGEVERSION STRING 1 "5.0.1" END_GROUP = PGEVersionClass GROUP = InputGranule INPUTPOINTER STRING FR(A) Variable END_GROUP = InputGranule GROUP = RangeDateTime RANGEBEGINNINGDATE DATE 1 Variable RANGEBEGINNINGTIME TIME 1 Variable RANGEENDINGDATE DATE 1 Variable RANGEENDINGTIME TIME 1 Variable END_GROUP = RangeDateTime GROUP = SpatialDomainContainer GROUP = HorizontalSpatialDomainContainer GROUP = GPolygon GROUP = GRing EXCLUSIONGRINGFLAG STRING 1 "N" END_GROUP = GRing GROUP = GRingPoint GRINGPOINTLATITUDE DOUBLE 4(A) Variable GRINGPOINTLONGITUDE DOUBLE 4(A) Variable GRINGPOINTSEQUENCENO INTEGER 4(A) Variable END_GROUP = GRingPoint END_GROUP = GPolygon END_GROUP = HorizontalSpatialDomainContainer END_GROUP = SpatialDomainContainer GROUP = MeasuredParameter PARAMETERNAME STRING 1 "MOD_PR17A1" GROUP = QAFlags AUTOMATICQUALITYFLAG STRING 1 "Pass" AUTOMATICQUALITYFLAGEXPLANATION STRING 1 "No automatic quality assessment is performed in the PGE" SCIENCEQUALITYFLAG STRING 1 Variable SCIENCEQUALITYFLAGEXPLANATION STRING 1 "See http://landweb.nascom.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra for the product Science Quality status" END_GROUP = QAFlags GROUP = QAStats QAPERCENTINTERPOLATEDDATA INTEGER 1 Variable QAPERCENTMISSINGDATA INTEGER 1 Variable QAPERCENTOUTOFBOUNDSDATA INTEGER 1 Variable QAPERCENTCLOUDCOVER INTEGER 1 Variable END_GROUP = QAStats ENDGROUP = MeasuredParameter GROUP = AdditionalAttributes ADDITIONALATTRIBUTENAME STRING FR(C) Variable PARAMETERVALUE STRING FR(C) Variable ADDITIONALATTRIBUTENAME.1 = QAPERCENTGOODQUALITY ADDITIONALATTRIBUTENAME.2 = QAPERCENTOTHERQUALITY ADDITIONALATTRIBUTENAME.5 = HORIZONTALTILENUMBER ADDITIONALATTRIBUTENAME.6 = VERTICALTILENUMBER ADDITIONALATTRIBUTENAME.7 = TileID END_GROUP = AdditionalAttributes GROUP = AssociatedPlatformInstrumentSensor ASSOCIATEDPLATFORMSHORTNAME STRING 1 "Terra" ASSOCIATEDINSTRUMENTSHORTNAME STRING 1 "MODIS" ASSOCIATEDSENSORSHORTNAME STRING 1 "MODIS" END_GROUP = AssociatedPlatformInstrumentSensor ENDGROUP = INVENTORYMETADATA ProductMetadata.0 This string will contain the following PVL fields: # Field Name Data of Value Type Values GROUP = ARCHIVEDMETADATA GROUP = BoundingRectangle NORTHBOUNDINGCOORDINATE DOUBLE 1 Variable SOUTHBOUNDINGCOORDINATE DOUBLE 1 Variable EASTBOUNDINGCOORDINATE DOUBLE 1 Variable WESTBOUNDINGCOORDINATE DOUBLE 1 Variable END_GROUP = BoundingRectangle ALGORITHMPACKAGEACCEPTANCEDATE STRING 1 "2005-02-11" ALGORITHMPACKAGEMATURITYCODE STRING 1 "Normal" ALGORITHMPACKAGENAME STRING 1 "MOD_PR17A1" ALGORITHMPACKAGEVERSION STRING 1 "5" GEOANYABNORMAL STRING 1 Variable GEOESTMAXRMSERROR DOUBLE 1 Variable LONGNAME STRING 1 "MODIS/Terra Net Photosynthesis Daily Intermediate L4 Global 1km SIN Grid" PROCESSINGCENTER STRING 1 "MODAPS" PROCESSINGENVIRONMENT STRING 1 "set by uname" SYSTEMFILENAME STRING 1 Variable NUMBEROFGRANULES INTEGER 1 Variable GRANULEDAYNIGHTFLAG STRING FR(A) Variable GRANULEBEGINNINGDATETIME D/T FR(A) Variable GRANULEENDINGDATETIME D/T FR(A) Variable NUMBEROFORBITS INTEGER 1 Variable CHARACTERISTICBINANGULARSIZE DOUBLE 1 Variable CHARACTERISTICBINSIZE DOUBLE 1 Variable DATACOLUMNS INTEGER 1 Variable DATAROWS INTEGER 1 Variable GLOBALGRIDCOLUMNS INTEGER 1 Variable GLOBALGRIDROWS INTEGER 1 Variable NADIRDATARESOLUTION STRING 1 "1km" MAXIMUMOBSERVATIONS INTEGER 1 Variable COVERAGECALCULATIONMETHOD STRING 1 "area" SPSOPARAMETERS STRING 2 "3716" ENDGROUP = ARCHIVEDMETADATA StructuralMetadata.0 This string will be populated automatically by HDF-EOS. Global (SCF internal) File Attributes char UM_VERSION int32 ndays_completed[366] Grid Structure: MOD_Grid_MOD17A1 Data Fields: Gpp_daily_1km, Gpp_Rm_1km, AnnMax_LeafMass_1km, AnnMax_Sum_Mr_1km, Dimensions: Dimension Dimension Name Value Dimension_0 YDim:MOD_Grid_MOD17A1 "DataRows" Dimension_1 XDim:MOD_Grid_MOD17A1 "DataColumns" Corner Locations: Corner Values UpperLeftPointMtrs (Variable, Variable) LowerRightPointMtrs (Variable, Variable) Geographic Grid Projection Parameters: Sinusoidal Projection Projection GCTP_SNSOID ProjParam[0] 6371007.181 ProjParam[1 to 7] 0.0 ProjParam[8] 0.0 ProjParam[9] 0.0 ProjParam[10] 0.0 ProjParam[11 to 12] 0.0 Spherecode -1 GridOrigin HDFE_CENTER Integrized Sinusoidal Projection Projection GCTP_ISINUS ProjParam[0] 6371007.181 ProjParam[1 to 7] 0.0 ProjParam[8] 21600 ProjParam[9] 0.0 ProjParam[10] 1.0 ProjParam[11 to 12] 0.0 Spherecode -1 GridOrigin HDFE_GD_UL =========================================================================== Data Field_1 ------------ Data Field Name: Gpp_Daily_1km Description: Daily cumulative gross primary productivity, (e.g.Photosynthesis), in kg C/m^2, at 1KM resolution Type: HDF-int16 Dimensions: Dimension Name Value YDim DataRows XDim DataColumns HDF Attributes: Number of Values or Max. Attribute Data String Value Type Length long_name STRING 14 "GPP_DAILY_1KM" units STRING 8 "kg_C_m^2" valid_range INT16 2 0 3000 _FillValue INT16 1 32767 scale_factor FLOAT64 1 0.0001 add_offset FLOAT64 1 0.0 scale_factor_err FLOAT64 1 0.0 add_offset_err FLOAT64 1 0.0 calibrated_nt INT32 1 22 Data (HDF NCSA style) conversions (to and from digital to analytical): Gpp_daily_1km = scale_factor * (Digital_form - add_offset) Digital_Form = (Gpp_1km / scale_factor) + add_offset Data Field_2 ------------ Data Field Name: Gpp_Rm_1km Description: Daily Photosynthesis (GPP) Minus Maintenance Respiration (RM), in kg C/m^2 at 1KM resolution. Type: HDF-int16 Dimensions: Dimension Name Value YDim DataRows XDim DataColumns HDF Attributes: Number of Values or Max. Attribute Data String Value Type Length long_name STRING 14 "GPP_RM_1KM" units STRING 8 "kg_C_m^2" valid_range INT16 2 0 2000 _FillValue INT16 1 32767 scale_factor FLOAT64 1 0.0001 add_offset FLOAT64 1 0.0 scale_factor_err FLOAT64 1 0.0 add_offset_err FLOAT64 1 0.0 calibrated_nt INT32 1 22 Data (HDF NCSA style) conversions (to and from digital to analytical): Gpp_Rm_1km = scale_factor * (Digital_form - add_offset) Digital_Form = (Gpp_Rm_1km / scale_factor) + add_offset Data Field_3 ------------ Data Field Name: AnnMax_LeafMass_1km Description: Leaf mass accumulated over an annual period, at 1KM resolution, in kg C/m^2 units. Type: HDF-int16 Dimensions: Dimension Name Value YDim DataRows XDim DataColumns HDF Attributes: Number of Values or Max. Attribute Data String Value Type Length long_name STRING 14 "ANNMAX_LEAFMASS_1KM" units STRING 8 "kg_C_m^2" valid_range INT16 2 0 2000 _FillValue INT16 1 32767 scale_factor FLOAT64 1 0.0001 add_offset FLOAT64 1 0.0 scale_factor_err FLOAT64 1 0.0 add_offset_err FLOAT64 1 0.0 calibrated_nt INT32 1 22 Data (HDF NCSA style) conversions (to and from digital to analytical): AnnMax_LeafMass_1km = scale_factor * (Digital_form - add_offset) Digital_Form = (AnnMax_LeafMass_1km / scale_factor) + add_offset Data Field_4 ------------ Data Field Name: AnnSum_Mr_1km Description: Sum of maintenance respiration term, accumulated over an annual period, at 1KM resolution, in kg/m^2 units. Type: HDF-int32 Dimensions: Dimension Name Value YDim DataRows XDim DataColumns HDF Attributes: Number of Values or Max. Attribute Data String Value Type Length long_name STRING 14 "ANNMAX_SUM_MR_1KM" units STRING 8 "kg m^2" valid_range INT32 2 0 20000 _FillValue INT16 1 20001 scale_factor FLOAT64 1 0.01 add_offset FLOAT64 1 0.0 scale_factor_err FLOAT64 1 0.0 add_offset_err FLOAT64 1 0.0 calibrated_nt INT32 1 5 Data (HDF NCSA style) conversions (to and from digital to analytical): AnnMax_Sum_Mr_1km = scale_factor * (Digital_form - add_offset) Digital_Form = (AnnMax_Sum_Mr_1km / scale_factor) + add_offset Data Field_5 ------------- Data Field Name: PsnNetSum8day_1km Description: 8-day accumulation of Daily Photosynthesis (GPP) Minus Maintenance Respiration (RM), in kg C/m^2 at 1KM resolution. Type: HDF-int16 Dimensions: Dimension Name Value YDim DataRows XDim DataColumns HDF Attributes: Number of Values or Max. Attribute Data String Value Type Length long_name STRING 14 "PSN_NET_SUM_8DAY_1KM" units STRING 8 "kg_C_m^2" valid_range INT16 2 0 32760 _FillValue INT16 1 32767 scale_factor FLOAT64 1 0.0001 add_offset FLOAT64 1 0.0 scale_factor_err FLOAT64 1 0.0 add_offset_err FLOAT64 1 0.0 calibrated_nt INT32 1 22 Data (HDF NCSA style) conversions (to and from digital to analytical): PsnNetSum8day_1km = scale_factor * (Digital_form - add_offset) Digital_Form = (PsnNetSum8day_1km / scale_factor) + add_offset ============================================================================