Integration Readiness Review NEXRAD Turbulence Detection Algorithm (NTDA) Gary Blackburn, Steven G. Carson, John K. Williams NCAR Research Applications Laboratory January 30, 2007

Outline Action items from last DAR Intellectual Property Issue/New CPC Review of data flow and CCR Review of documentation –WSR-88D System Specification (SS) –Software Requirement Specification (SRS) –Product Specification –Interface Control Document (ICD) RPG to Class 1 User –Software Description Document Review of IRR matrices –Deliverables matrix –Infrastructure Details matrix –Test matrix Content of handoff

Action items from last DAR The ROC will provide NCAR with SZ-2 data for use in creating NTDA interest maps for VCPs 211, 212 and 221. NCAR will provide CodeView plots of the NTDA output at different range resolutions on the FTP site. (Done) NCAR will place the detailed size information for the VCP 12 case on the FTP site. (Done) –Note: Resource usage is higher than originally reported, but still within the SREC targets. DAR materials and minutes may be found at ftp://ftp.rap.ucar.edu/pub/jkwillia/NTDA/DAR_2/

Product size breakdown Case: KINX _ (VCP 12, significant weather coverage) Resource usage summary: –Timing: 9.70 sec/volume –Product: kB/volume (total of lelb_mon lengths) –Tilt Lengths from lelb_mon: No.(EDR)+(CONF) = 4100 = 4.00 kB = 4980 = 4.86 kB = 6216 = 6.07 kB = = kB = = kB = = kB = = kB = 8917 = 8.71 kB = 7759 = 7.58 kB = 6380 = 6.23 kB = 5613 = 5.48 kB = 5077 = 4.96 kB = 4407 = 4.30 kB = 3804 = 3.71 kB

Resolution comparison 0.25 km range resolution2.0 km range resolution

Intellectual Property Issue UCAR’s legal office: NTDA should be licensed for government use under UCAR’s agreement with the FAA. –Who is the ROC point of contact to complete license agreement? –See accomanying draft agreement NTDA_FAA_ROC_license_ doc Inclusion in the proposed separate CPC with MIT/LL software not for public distribution would be ideal.

298 RECCLGIDREF ELEVATION_DATA 303 COMBBASE_ELEV ELEVATION_DATA NTDA_ALG 99/01 ELEVATION 162 NTDA_EDR_IP ELEVATION_DATA 163 NTDA_CONF_IP ELEVATION_DATA NTDA_FP 99/01 ELEVATION 162 NTDA_EDR_IP ELEVATION_DATA 163 NTDA_CONF_IP ELEVATION_DATA {See: P.NN} High-Level NTDA Data Flow in ORPG Data Flow Diagrams, Figure 1 CCR #NA , “IMPLEMENTATION OF THE NEXRAD TURBULENCE DETECTION ALGORITHM (NTDA) IN THE NEXRAD OPEN RPG”

Review of documenation See accompanying file ROC_DOCS_NTDA_B10.doc See following slides for flow diagrams

NtdaMain.c NtdaApp.c NtdaAlgs.c NtdaApp_Init() nexrad_sw_to_edr_LmodInf.txt NtdaParamData.h NtdaApp_InitParams() NtdaApp.h NtdaAppStruct_t Params mParams; NtdaAlgsStruct_t mNtdaAlgs; Data path Function call NtdaApp_ReadSwMultTable() int mSWMultVsDist_Size; float *mSWMultVsDist_Dist, *mSWMultVsDist_Mult; NtdaAlgs_init() NtdaApp_Run() Siteadp_adpt_t mSiteAdaptData; NTDA_ALG Data Flow : Initialization (once at startup) Data Description ORPG linear buffer ORPG linear buffer NTDA parameter data in header file NTDA_ALG main program ORPG site adaptation data NTDA core algorithm struct

NTDA_ALG Data Flow : Once Per Elevation - Overview NtdaApp.h NtdaAppStruct_t Compact_basedata_elev *mCombbaseElev; NtdaElevIntProd_t mIP_EDR; ReccldigrefInputBuffer_t *mReccldigref; NtdaElevIntProd_t mIP_CONF; NtdaApp.c NtdaApp_Run() NtdaApp_GetPtr_COMBBASE_ELEV() NtdaApp_GetPtr_RECCLDIGREF() COMBBASE_ELEV RECCLDIGREF NtdaApp.c (cont’d) NtdaApp_ProcessElevation() {see p.NN} NtdaApp_WriteProducts() NTDA_CONF_IP NTDA_EDR_IP ORPG linear buffer ORPG linear buffer ORPG linear buffer ORPG linear buffer likelihood of clutter DZ,VE,SW NTDA EDR intermediate product NTDA CONF intermediate product COMBBASE_ELEV DZ, VE, SW RECCLDIGREF likelihood of clutter Data path Function call Data Description

NTDA_ALG Data Flow : Once Per Elevation - Detail NtdaApp.c NtdaApp.h NtdaAppStruct_t Compact_basedata_elev *mCombbaseElev; ReccldigrefInputBuffer_t *mReccldigref; COMBBASE_ELEV DZ, VE, SW RECCLDIGREF likelihood of clutter NtdaApp.h NtdaAppStruct_t ae_pack mSunAzElStruct NtdaElevIntProd_t mIP_EDR; NtdaElevIntProd_t mIP_CONF; NTDA EDR intermediate product NTDA CONF intermediate product Data needed for sunspike censoring BaseDataHdrInfo_t mBaseDataHdrInfo; From COMBBASE_ELEV Base_data_header NtdaApp_ProcessElevation(): Various scalar members of NtdaAppStruct_t Same header file: NtdaApp_ProcessElevation() reads from and writes to this struct Siteadp_adpt_t mSiteAdaptData; ORPG site adaptation data NtdaApp_RadarData2Arrays() NtdaAuxFields_t mAuxFields; Working copies of all UHCAR arrays NtdaApp_NTDA_CalcInit() NtdaApp_NTDA_CalcEDR() NtdaIP_EncodeIP() NtdaApp_WriteProducts() NtdaAuxFields_t mAuxFields; Working copies of all UHCAR arrays ae_pack mSunAzElStruct Data needed for sunspike censoring NTDA_CONF_IP NTDA_EDR_IP ORPG linear buffer ORPG linear buffer

Review of IRR Matrices See accompanying file NTDA_Build10_process_matrix.xls

Handoff Method and Contents Delivery via “hidden” NCAR FTP site –readme file –tar file containing C code and header files –stubs for product generation tables product tables task table –ORPG manpages –draft documentation –sample output data and select screen shots –recommended CVG color tables for EDR and confidence

Proposed Package Updates Modifications for porting to ORPG Build 9 Interest maps for SZ-2 VCPs Additional Optimization –Code changes that yield > 10% speedup but were too risky for this build –New scaling of EDR that should reduce product size Additional testing Address any issues identified by the ROC

Integration challenges and risks Need to anticipate Build 10.0 changes that may impact the NTDA where possible –NTDA interest maps and parameters must be specified for each new VCP; the default interest map may not produce optimal results Any degradation in SW estimate accuracy or sampling volume in future ORDA changes could cause erroneous NTDA output –Recent simulation studies have suggested that the pulse-pair method used in the ORDA produces significant positive bias for low SWs. If an improved estimator can be implemented, the NTDA’s ability to identify all levels of turbulence will be enhanced.

NCAR contact information John Williams Steve Carson Gary Blackburn Greg Meymaris