**May 21, 2026: Footprint Geometry Correction**  
We've deployed a minor fix to ensure representativeness of STAC item footprint geometries with actual imaged area.

**March 31, 2026: Coregistration Improvements**  
We've refined our mutual information-based coregistration workflow for improved feature matching between the LWIR and VNIR data.

**February 24, 2026: Geometric Processing Improvements**  
We've updated our georeferencing and VNIR band alignment workflows to improve geolocation accuracy and band-to-band registration. This release includes:

1. An enhanced optical distortion correction to reduce residual along-track offsets  
2. Use of a digital elevation model (DEM) to improve band-to-band registration over complex terrain

**February 5, 2026: Level-1 Unit Changes**  
We've modified the units for our Level-1A and Level-1B data products.

#### Before The Change  
Previously, L1A and L1B imagery assets contained per-band digital number data. To arrive at radiance, the user needed to apply gain and offset coefficients provided in product metadata.

#### After The Change  
**Level-1A Products**  
- L1A imagery assets now natively contain per-band top-of-atmosphere (TOA) radiance values. Gain and offset coefficients are applied as part of Hydrosat's data processing.
  
  - Units: W/m2/sr/μm  
  - Scaling factor: 0.01 (VNIR), 0.0001 (LWIR)

**Level-1B Products**  
- L1B imagery assets contain per-band TOA reflectance data (for VNIR bands) and brightness temperature data (for LWIR bands).
  
  - Units: Unitless (VNIR); Kelvin (LWIR)  
  - Scaling factor: 0.0001 (VNIR); 0.01 (LWIR)

**Conversions**  
- Hydrosat provides a full suite of coefficients in product metadata for conversion between TOA radiance and reflectance (or brightness temperature). For more information on usage, see [this page](https://satdocs.hydrosat.com/product-details#conversions) or our product guide.

**January 27, 2026: Thumbnail Colorization Improvements (LWIR)**  
We've improved the contrast and visual consistency in our L1B and L2 thermal thumbnails and previews. This includes:

- Consistent scaling across the full imaging strip rather than within individual scenes.
- A switch from the `inferno` color ramp to a modified `RdYlBu_r` color ramp, where cooler pixels are shown in blue and warmer ones in red. These colors map to predictable temperatures; the breakpoint from blue to yellow occurs at approximately 0 degrees Celsius.

This change has no impacts on the underlying data.

**January 20, 2026: Noise Mitigation**  
We've implemented a minor correction for noise in the thermal products.

**January 14, 2026: Thumbnail Colorization Improvements (RGB)**  
We've released a color curve approach that improves the visual contrast in our true color thumbnails. This change has no impacts on the underlying data.

**December 17, 2025: Updated Cloud Mask**  
We've released an improved cloud mask, which uses a U-Net convolutional neural network architecture. The new model outperforms our baseline Fmask approach across several key metrics.