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The Envirofacts Data Layer

The Envirofacts Data Layer. Existing EF layers have multiple records for a single facility causing symbology and text labeling issues. Metadata says all points NAD83. NOT TRUE – many points flagged as Hdatum_code = 001 indicating NAD27 and NO DATUM SHIFTS have been performed!

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The Envirofacts Data Layer

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  1. The Envirofacts Data Layer • Existing EF layers have multiple records for a single facility causing symbology and text labeling issues. • Metadata says all points NAD83. NOT TRUE – many points flagged as Hdatum_code = 001 indicating NAD27 and NO DATUM SHIFTS have been performed! • Lack of flexibility for local data location improvement and attribute enhancements in a timely and automated fashion.

  2. Region 10 Facility Data Layer • In most cases returns a single record per facility. • A variety of attributes and flags were added to allow data selection and symbolization beyond those possible with the LRT • major/minors • individual program • number of programs • stackable and sizeable symbol support • NADCON datum shift was performed on NAD27 source data. Additional lat/lng83 fields were added to avoid confusion. • Provides the ability to easily override locational information with the R10 “local” LRT file, but still can be provided back to the national LRT.

  3. Region 10 Facility Data Layer • Automated and scheduled scripts/tasks perform all steps • Download from HQ Oracle using MS SQLServer DTS • C programs perform NADCON shift and SDE data layer refresh. • Joined with other data such as FRS and ICIS (enforcement data – penalties, notice violations, enforcement actions) • Data is downloaded and processed in about 2 hrs from start to finish for the ENTIRE U.S. (Includes EF, LRT, and FRS) • Data is accessed by applications (Erains) without disruption.

  4. Magnitude of DATUM issue • Initial coordinates from LRT_BEST_COORDINATES • the best locational record from the PCS, TRI, RCRA, AFS, and MULTI layers • Entire database contains 805,017 records (All U.S.) • 254,406 records have a Hdatum_Code = 001 (NAD27) or 32% indicate that a datum shift is needed! • Datum shift ranges from near 0 to 400 meters • R10 data typically shifted 100 meters • About 160,000 (60%) of the shifted values were RCRA “minors”

  5. DATUM Shift Processing • Took 15 minutes to run NADCON on the entire set • Visual inspection showed the results did improve the locations – many sites are now located along the proper road!

  6. Data Set Contents About 1.5 GB uncompressed FRS Facility File 1,425,254 records 3/15/2004 EF_Layer 856,673 records 3/15/2004 LRT Reference File 2,091,270 records 3/15/2004 LRT Best Coordinates File 805,017 records 3/15/2004 CERC_Data 1,572 records 3/15/2004 All_Interest 3,562,513 records 3/15/2004 US_Facilities 805,017 records 3/15/2004

  7. Example symbolization using one new field… • Field name Pgm_Key(text string concatenation of following character data): A = AFS Major a = AFS Minor or Synthetic Minor B = BRS (Biennial Reporting System – RCRA LQG/TSD reporting) c = CERCLIS – Not a NPL, but had record in FRS Interest tables for Superfund C = CERCLIS NPL F,D,P site p = PCS Minor P = PCS Major r = RCRA “Minor” (not TSD or LQG) R = RCRA “Major” (TSD and/or LQG) T = TRI reporter • Examples of Map Text Labeling (many more in documentation): Big Major Company (APrT) Would indicate facility is an AFS major, PCS Major, RCRA minor and TRI reporter. Little Dry Cleaner (r) Would indicate facility is RCRA minor.

  8. For more information Ray Peterson Region 10 – Seattle 206.553.1682 peterson.ray@epa.gov

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