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SimSat v0.1.9 - reviewed low-sun lighting, reproducible modes, and sensor QA

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@FahrenheitResearch FahrenheitResearch released this 12 Jul 17:52
v0.1.9
39f928a

SimSat v0.1.9 — reviewed low-sun lighting, reproducible modes, and sensor QA

v0.1.9 is the first public release since v0.1.6. It includes the v0.1.7 and v0.1.8 development work, which was previously available only in local test builds.

Highlights

  • Corrected visible lighting near sunrise and sunset:

    • Land assistance now ramps smoothly from 0–12° solar elevation.
    • Water keeps physically valid direct sunlight at low sun.
    • The reviewed cloud-shadow diffuse floor is now 0.45.
    • Standalone cloud layers remain neutral at night instead of darkening host basemaps.
    • Finite-sun cloud penumbra now uses the Sun’s angular radius.

  • Added three transparent, one-click Studio modes:

    • Recommended Display
    • High Quality Visible
    • Sensor QA

    Presets show their exact changes, save immediately, and leave every underlying setting editable.

  • Added explicit Display and Sensor Fast Gray render intents with machine-readable provenance. Sensor Fast Gray is an intentionally limited QA operator—not a claim of complete ABI/AHI sensor equivalence.

  • Expanded observation and physics QA:

    • Official GOES-R ABI ellipsoid/fixed-grid navigation
    • Official GOES-19 ABI Band 13 FM4 spectral-response integration
    • Exact-grid visible and raw-Kelvin GOES validation tools
    • Deterministic 4/8/16 fractional-cloud subcolumn references
    • Opt-in native-moment cloud optics
    • Experimental ScienceCloudF16 storage and ABI Band 13 footprint paths

  • SSB cache format is now v6. Older source-backed caches rebuild once and preserve available HRRR/RRFS SNMR snow identity.

Stable reviewed defaults

This release deliberately does not add another global gamma transform. The reviewed visible defaults remain:

  • Exposure: 1.5
  • Aerosol optical depth: 0.05
  • Cloud optical-depth scale: 0.15
  • Ground gain: 1.0
  • Cloud highlight knee: 0.65
  • Cloud highlight ceiling: 1.25

High Quality Visible retains that baseline while selecting deterministic-4 cloud geometry and a 0.45 highlight knee. All values remain independently adjustable through the Studio, CLI, Python, and Rust interfaces.

Downloads

  • simsat-studio-v0.1.9-windows-x86_64.exe — self-contained Windows desktop app with static CRT; no Visual C++ redistributable is required.
  • simsat-0.1.9-cp38-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl — Python wheel for CPython 3.8 or newer on compatible x86-64 Linux systems.
  • simsat-cli-v0.1.9-linux-x86_64.tar.gz — Linux command-line tools:
    • simsat-render-frame
    • simsat-render-ir
  • THIRD-PARTY-NOTICES.txt — dependency licenses, attributions, and NOAA ABI SRF provenance.

The Windows executable is currently unsigned, so Microsoft SmartScreen may show an “unknown publisher” warning. Verify its SHA-256 value below before running it.

Validation

The release commit passed the public Rust/Python CI suite and the manually dispatched cross-platform artifact build:

The shipped Windows executable is the exact locally built, owner-tested static binary. Release validation also covers Python wheel import/generated-scene rendering and Linux CLI startup.

The selected lighting behavior was reviewed across seven lighting anchors and an 11-image sweep spanning ten distinct WRF/HRRR runs, including Hurricane Michael in geostationary and top-down views.

SHA-256

2411F6BF0B5CE498D6CF59A95242188A93F6F0D31725AA3BD6D9BBF58B3C30F5  simsat-studio-v0.1.9-windows-x86_64.exe
10CEA8E0892C1A1DDCB41E697EDF3ECF6169E41708E97B1D7652B4DDED3D5064  simsat-0.1.9-cp38-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
4E1795A0BF80814211BBE7C6664EC14977A07288AA3E5F00C9688381B572AB57  simsat-cli-v0.1.9-linux-x86_64.tar.gz
E235FA33875603FE529DED887E6FD2CF4C595B7F486CE57567E3E4CED6C6C036  THIRD-PARTY-NOTICES.txt
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