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Version Release Notes

Current Versions



Version
  • 3.6
  • 3.5
  • 3.4
  • 3.3
  • 3.2

Introduced
or Updated
  • May 2022
  • May 2021
  • March 2020
  • April 2019
  • October 2016


Description
    • Initiated coverage in Oceania and East Asia 6/21.
    • Increased temporal resolution of aerosol optical depth modeling. Hourly resolution data improves DNI accuracy and captures aerosol events such as severe wildfires.
    • Added snow albedo input to the clear sky model to increase accuracy in locations with persistent snow cover.
    • Introduced surface albedo data output to support bi-facial project modeling.
    • Incorporated 2020 into typical year datasets.
    • Initiated coverage in Europe. Updated to include West Asia & Africa 2/21.
    • Implemented dynamic aerosol optical depth (AOD) input to clear sky model, improving temporal consistency.
    • Updated satellite hardware calibration parameters using latest available data.
    • Updated auxiliary datasets (wind speed, temperature, precipitation) to maximize spatial and temporal consistency.
    • Increased spatial resolution and mapping of snow input data, increasing accuracy in areas with variable snow coverage.
    • Time-series end date: June 30, 2022.
    • Initiated coverage in South America.
    • Improved interpolation for multi-hour gaps in satellite images.
    • Improved temperature data quality in the U.S.; removed METAR as an input source.
    • Updated satellite hardware calibration parameters using latest available data.
    • Fixed time shift in clear sky output; GHI output was not affected.
    • Time-series end date: June 30, 2022.
    • Real-time support added (January 2018).
    • Forecast support added (January 2018).
    • Improved data delivery speed from model application.
    • Physical range checks added.

Previous Versions



Version
  • 2.5
  • 3.0
  • 2.4
  • 2.3
  • 2.1/2.2 annual values
  • 2.0 Enhanced Resolution
  • 2.0 tool compatibility release
  • 2.0 initial release
  • 1.1
  • 1.0


Introduced
  • October 2016
  • March 2015
  • November 2013
  • January 2013
  • June 2011
  • March 2011
  • January 2011
  • February 2010
  • February 2009
  • January 2003


Description
    • Physical range checks added.
    • Incorporates infrared image processing into model to improve accuracy in geographies that experience heavy snowfall.
    • Adjustment to upper clear sky bounds to support improved cloud measurement precision.
    • Improved hour-ending integration algorithm that results in increased hourly accuracy.
    • Algorithm is not applied to “SolarAnywhere, Irradiance centered on satellite measurement time” output format requests.
    • Adjustment to DNI values in Nov 2012 in some areas around Hurricane Sandy.
    • Annual totals available.
    • Additional service method allowing selection of annual totals.
    • Refinements to timeshifting and typical GHI/DNI year algorithms.
    • Enhanced Resolution (1km) data added for California.
    • Additional service method allowing selection of spatial and temporal data resolution.
    • “GlobalIrradiance (W/m2)” column renamed to “Global Horizontal Irradiance (GHI) W/m2”.
    • “DirectIrradiance (W/m2)” column renamed to “Direct Normal Irradiance (DNI) W/m2”.
    • “DiffuseIrradiance (W/m2)” column renamed to “Diffuse Horizontal Irradiance (DIF) W/m2”.
    • New compatability features for direct import into PVSYST and NREL Solar Advisor Model.
    • All estimates centered at top-of-hour representing last sixty minute averages (by default).
    • Diffuse Horizontal Irradiance (DHI) estimates added to output files.
    • PV Simulation: GHI Average 12 Months files containing 8760 hourly values for representative year based on historical time-series.
    • CS Simulation: DNI Average 12 Months files containing 8760 hourly values for representative year based on historical time-series.
    • PVSYST Preliminary Design-compatible Average Month Days files.
    • Improved v2.0 model with estimates for snow and other high albedo conditions.
    • Hourly forecasts up to seven days in advance.
    • Historical data extended back to January 1, 1998 and processed with new v2.0 model.
    • Nighttime temperature and wind values.
    • More granular descriptions of how each specific output data value was generated via additional ObservationTypes and a new forecast LeadTime column.
    • Adjustable hourly ObservationTime (time shift).
    • Updated website with graphical map interface.
    • Email option for dataset delivery.
    • Synchronization of Hawaii model data including sunrise/sunset hours update, all Hawaii GHI and DNI data impacted.
    • Adjusts albedo parameters in global model, all GHI and DNI data impacted. METAR wind and temperature data patches for select locations.