Cloud-free Sentinel-2 for continuous land monitoring
ClearSKY fuses optical and SAR imagery from multiple satellite constellations to deliver Sentinel-2-compatible imagery for continuous land monitoring.
- Cloud-free Sentinel-2-compatible imagery
- Near real-time and historical delivery
- Built for agriculture, forestry and land monitoring
Cloud-free Sentinel-2-compatible imagery generated through ClearSKY data fusion.
Advanced Processing Techniques
Optical Data Cleaning
We clean up raw Sentinel-2 data to remove clouds, cloud shadows, and other image artifacts. Enhancing clarity and preserving essential spectral details across all bands. This in itself adds up to 20% more useful data.
SAR Optical Fusion
We fuse Sentinel-1 SAR data with optical imagery to generate clear, cloud-free and consistent optical imagery. This helps ensure uninterrupted insights, even in countries with cloud-prone areas and time periods.
Satellite Translation
Leveraging data from diverse optical satellites, we translate the imagery into a standardized Sentinel-2 format for seamless integration with your workflows. All happening within the same data fusion service.
Data Fusion as a Service
Minimum Order Area
Order imagery for as small as 0.5 km² area, ensuring affordability even for small projects.
Flexible Revisit Speeds
Choose data fusion revisit speeds from 1 to 7 days to capture rapid ground changes.
Ordering Options
Select from composite, full tile, and mini tile orders to suit your project needs.
Attractive Discounts
Enjoy up to 80% off on full tiles (2621 km²) and 50% off on mini tiles (10.24 km²).
Custom Satellite Selection
Tailor your order by choosing the model that suits you, and optional satellite to meet specific criteria.
Near Real-Time Delivery
Order future delivery of live data or get historical data delivered a few hours after ordering.
To order imagery on-demand and experience the full potential of our data fusion capabilities, please visit dashboard.clearsky.vision.
Level-1 (TOA) vs Level-2A (BOA)
We historically delivered Level-2A (BOA) Sentinel-2 products. With our new Nimbus model, orders are produced at Level-1 (TOA) by default. In your downloads you can get both: the Nimbus Level-1 output and a Level-2A product (Sen2Cor-style atmospheric correction applied) for workflows that prefer BOA reflectance.
Level-1C (TOA) via Nimbus
Top-of-Atmosphere reflectance generated by Nimbus (cloudless, temporally consistent and analysis-ready).
- Fastest availability and best temporal consistency for our fusion models.
- Great for change detection & ML where relative signals and cadence matter most.
- More sensitive to atmospheric effects; some indices can vary more across dates.
Level-2A (BOA) Download
Bottom-of-Atmosphere reflectance (Sen2Cor-like), derived directly from the Nimbus Level-1 products.
- Better absolute reflectance for cross-date comparability and biophysical retrievals.
- Preferred for BOA-based indices (e.g., more stable vegetation metrics in some settings).
- Slightly higher latency and occasional artifacts over complex atmospheres or bright targets.
Ordering: When you order with Nimbus, we produce a Level-1C (TOA) product. From the same order you can download Level-2A (BOA) as needed. No re-ordering required as long as the data is available. Different Level-2A BOA formats available upon request.
Level-1 (TOA) provides 13 spectral bands (B1–B12) while Level-2A (BOA) downloads include 12 bands.
In-Depth Service Description
Click to expand for more details.
Application Areas
Our cloudless Level-1C and Level-2A data formats are compatible and interoperable with many different applications in agriculture, forestry, environmental and supply chain tracking.
Precision Agriculture
Continuous monitoring of arable crops and pasture fields.
Modern Forestry
Wall-to-wall change detection for forests in hard to reach places.
Supply Chain
Ensure compliance with continuous monitoring of deforestation.
Cloudless Fusion Models
Explore our currently available and up-and-coming AI-powered data fusion models below.
Output
Fit
- Best for
- New Production OrdersAgricultureTime Series
- Not ideal for
- Fastest Possible DeliverySnow Suppressed ProductsApplications Where Legacy Stratus 2 Continuity Is Required
- Strengths
- HazeThin CirrusCloud ShadowsEfficient Production
- Snow handling
- Keeps Snow
- Notes
- • Recommended default for new customers.• Same 10-band Sentinel-2 L2A output as Stratus-2.
Ordering limits
- AOI
- 1 km²+
- Geometry
- Polygon, MultiPolygon
Inputs
- Data types
- OpticalSAR
- Required
- Sentinel-1Sentinel-2Landsat 8/9
Overview
Stratus-3 is the recommended ClearSKY production model for cloudless Sentinel-2 L2A imagery. It follows a similar architecture to Stratus-2, but has been trained further and optimized for more efficient production. For customers, that means the same familiar 10-band Sentinel-2 L2A output with faster production workflows and lower expected latency.
Delivery notes
Output
Fit
- Best for
- Fast DeliveryNear Real Time WorkflowsOperational Monitoring
- Not ideal for
- Maximum Input ContextCustomers Prioritizing Best Quality Over SpeedOrders Where Landsat Context Is Mandatory
- Strengths
- Fast TurnaroundLow LatencyApi WorkflowsOperational Monitoring
- Snow handling
- Keeps Snow
- Notes
- • Landsat 8/9 is optional.• Using fewer inputs can reduce delivery time.
Ordering limits
- AOI
- 1 km²+
- Geometry
- Polygon, MultiPolygon
Inputs
- Data types
- OpticalSAR
- Required
- Sentinel-1Sentinel-2
- Optional
- Landsat 8/9
Overview
Stratus-2-Fast is built for customers who care most about low latency. It uses a similar architecture to Stratus-2 and Stratus-3, but relies on less input data to reduce production time. Landsat 8/9 can be used when needed, but is optional. When Landsat is not used, delivery can often be under 30 minutes, depending on AOI size, order mode, region, and input availability.
Delivery notes
Output
Fit
- Best for
- Existing Stratus 2 WorkflowsAgricultureTime Series
- Not ideal for
- New Default WorkflowsFastest Possible Delivery
- Strengths
- HazeThin CirrusCloud ShadowsHigh Latitude Sar Boost
- Snow handling
- Keeps Snow
- Notes
- • Use Stratus-3 for most new workflows.• SAR improves timeliness in high-latitude regions.
Ordering limits
- AOI
- 1 km²+
- Geometry
- Polygon, MultiPolygon
Inputs
- Data types
- OpticalSAR
- Required
- Sentinel-1Sentinel-2Landsat 8/9
Overview
Stratus-2 is the original ClearSKY production model for cloudless Sentinel-2 L2A imagery. It uses Sentinel-1, Sentinel-2, and Landsat 8/9 to produce 10-band multispectral Sentinel-2 outputs. It remains available for existing workflows and customers who require continuity with previous Stratus-2 deliveries, but Stratus-3 is recommended for most new orders.
Delivery notes
Output
Fit
- Best for
- Legacy WorkflowsExisting Customers Only
- Not ideal for
- New WorkflowsSnow ResearchCryosphere Analysis
- Strengths
- Snow SuppressionStable Time Series
- Snow handling
- Removes Snow
- Notes
- • Soon deprecated.• Do not start new workflows on this model.
Ordering limits
- AOI
- 1 km²+
- Geometry
- Polygon, MultiPolygon
Inputs
- Data types
- OpticalSAR
- Required
- Sentinel-1Sentinel-2Landsat 8/9
Overview
Stratus-2 (No Snow) is a legacy snow-suppression variant of Stratus-2. It was designed for users who wanted a consistent snow-free surface in regions with sporadic or transient snow. This model is planned for deprecation and should not be used for new workflows unless ClearSKY specifically recommends it for your case.
Delivery notes
Output
Fit
- Best for
- Full Spectral WorkflowsAdvanced Remote Sensing UsersMulti Sensor Workflows
- Not ideal for
- Standard Production OrdersCustomers Needing Fixed Public Specifications
- Strengths
- Full Spectral OutputImproved Sar Noise HandlingModular InputsMulti Sensor Workflows
- Snow handling
- TBD
- Notes
- • Available on request.• Specs subject to change while Nimbus is finalized.
Ordering limits
- AOI
- 1 km²+
- Geometry
- Polygon, MultiPolygon
Inputs
- Data types
- OpticalSAR
- Required
- Sentinel-1Sentinel-2
- Optional
- Landsat 8/9
Overview
Nimbus (Multispectral) is a preview model for users who need full spectral Sentinel-2 outputs and want access to ClearSKY's next-generation modular data-fusion pipeline. It is designed around more flexible input handling and improved SAR processing compared with the Stratus family. Nimbus is available on request while final production specifications, delivery options, and pricing are being finalized.
Delivery notes
Output
Fit
- Best for
- Ndvi Time SeriesDashboardsVegetation Monitoring
- Not ideal for
- Applications Requiring MultispectralCustomers Needing Fixed Public Specifications
- Strengths
- Lighter DownloadsSimple WorkflowsVegetation MonitoringDashboard Ready Output
- Snow handling
- TBD
- Notes
- • Available on request.• Output is NDVI only.
Ordering limits
- AOI
- 1 km²+
- Geometry
- Polygon, MultiPolygon
Inputs
- Data types
- OpticalSAR
- Required
- Sentinel-1Sentinel-2
- Optional
- Landsat 8/9
Overview
Nimbus (NDVI) is a preview NDVI-only model for users who want vegetation-index time series without downloading full multispectral imagery. It is designed for lighter workflows, dashboard use cases, and monitoring pipelines where NDVI is the primary output. Nimbus (NDVI) is available on request while final production specifications, delivery options, and pricing are being finalized.
Delivery notes
Transparent, usage-based pricing
We publish our €/km² rates by monthly spend. No forms, no opaque quotes. For most monitoring, cloud-free Sentinel-2 fusion is more cost-effective than tasking high-resolution satellites you don’t need.
| Monthly spend | Stratus-3 | Nimbus |
|---|---|---|
| €0.00 – €1,000.00 | €0.20/km² | €0.10/km² |
| €1,000.00 – €3,000.00 | €0.07/km² | €0.08/km² |
| €3,000.00 – €12,000.00 | €0.04/km² | €0.05/km² |
Rates exclude taxes/VAT. Discounts apply on paid plans. Actual updates depend on input data availability and order type.
Access Sample Data
Here’s a short time-series from southern Sweden generated with our Stratus-2 cloud-removal model on a six-day cadence. It captures the early growing season, when vegetation changes quickly from one acquisition to the next.
2023-04-29
2023-05-05
2023-05-11
2023-05-17
2023-05-23
2023-05-29
2023-06-04
2023-06-10
2023-06-16
2023-06-22
2023-06-28
Want the full sample package? We’ll send downloadable GeoTIFFs and a few additional previews so you can evaluate quality, cadence, and spectral consistency in your own workflow.