The monitoring question and reporting unit
This implementation guide considers Temperature Conversion in the context of Cocoa agroforestry systems, with Sentinel-3 SLSTR surface temperature as the selected data source. The purpose is to design a defensible monitoring workflow before purchasing imagery, selecting software settings or committing to an operational alert. Treat the proposed combination as a starting point for a feasibility assessment: the landscape may contain features that the product cannot resolve, and the relevant physical variable may differ from the decision a manager wants to make. Establish that relationship explicitly, then document what additional observations are required.
Landscape context and independent observations
Cocoa monitoring needs an explicit distinction between shaded agroforestry, open cultivation and surrounding natural vegetation. The operational question may concern canopy disturbance or continuity of planted blocks, but a satellite map of green cover alone cannot establish the identity, productivity or ownership of the cocoa growing beneath other trees. Define the reporting unit, the observed variable and the action a finding could trigger before selecting an indicator. Retain these definitions so evaluation addresses the management question rather than visual appearance.
Shade composition, canopy layering, pruning and wet-season cloudiness affect what the sensor observes. Small mixed holdings create substantial edge contamination. Build comparison groups using known management systems and acquisition conditions, keeping shade-tree changes distinct from changes in the understory crop whenever the evidence allows that distinction. Record the observation window and comparison population. Consistent processing cannot compensate for dates or spatial units representing different processes. Preserve acquisition and context information so another analyst can reconstruct the comparison.
Removal of a large shade tree may create a strong image change while cocoa remains in place. Dense tree cover may also persist after understory management has deteriorated. Neither greenness nor radar texture is a reliable stand-alone declaration of cocoa disease, sustainable production or absence of forest conversion. Treat competing explanations as hypotheses to test, with insufficient evidence retained as a legitimate result. Avoid forcing every difference into a problem class. Identify the additional observation that would change the interpretation.
Use independent farm observations describing crop presence, shade structure and recent interventions, with dates close to the image period. Hand over uncertain mixed areas separately from interpretable blocks. Traceability assessments should connect imagery with verifiable farm records and clearly defined boundaries rather than presenting spectral similarity as supply-chain proof. Document reference selection and independence from threshold or model tuning. Preserve usable coverage and rejected observations. State the conclusion's spatial and temporal support so later updates remain comparable without overstating measured evidence.
Select the measurement and data product
Sentinel-3 SLSTR provides visible, infrared and thermal observations, with dedicated land- and sea-surface-temperature products. The thermal information is regional in scale; its grid should not be interpreted as a measurement of individual buildings or small agricultural plots. Select the relevant surface-temperature product rather than deriving an unqualified temperature directly from a displayed thermal-band image or mixing land and ocean retrieval assumptions.
Read uncertainty fields, quality flags, cloud screening and the applicable view information for the product. Keep units, observation timing and processing version in the output metadata. When comparing several acquisitions, distinguish actual thermal change from changes in valid coverage or viewing conditions. A regional statistic should include the number and distribution of accepted pixels, especially when cloud screening removes different land-cover types unevenly.
Surface emissivity, atmospheric conditions and mixed pixels influence the retrieved temperature. A comparison with a weather station requires attention to the difference between radiating surface and near-surface air. Validate with suitable reference observations and use consistent day or night sampling. Regional heat maps can support investigation and planning, but they cannot by themselves determine a building's indoor temperature or a person's exposure.
Prepare and test the analysis
Confirm whether the product contains encoded surface temperature, brightness temperature or radiance. These quantities are not interchangeable, and a display palette cannot establish that the numeric layer represents degrees Celsius. Define the decision unit, observation period and consequence of an incorrect result before choosing processing settings. Separate the physical measurement from the management interpretation. The workflow should explain when available imagery is adequate, when more observations are needed, and who is responsible for reviewing uncertain cases.
Read the thermal product guide, apply its scale and offset once, and convert Kelvin to Celsius only where appropriate. Keep cloud exclusions, uncertainty information and invalid pixels separate from physical measurements. Keep a small representative test area and retain the original inputs. Record the product identifier, processing level, coordinate reference system and every setting that changes the numbers. Change one assumption at a time so that a reviewer can distinguish a processing effect from a real difference on the ground.
For a Landsat Collection 2 surface-temperature example, encoded value 40000 becomes 285.7208 Kelvin using factor 0.00341802 plus 149. Subtracting 273.15 gives approximately 12.57 degrees Celsius. This is an illustrative calculation for checking the logic, not a measured outcome or a universal threshold. Repeat it on known inputs before processing the full region. Then vary the relevant assumption and document whether the decision changes, including cases where the available evidence cannot support a confident answer.
Brightness temperature is not automatically land surface temperature. Unit labels can remain wrong after export, and applying a thermal conversion to a reflectance band can produce numeric values with no valid interpretation. A plausible color pattern alone cannot resolve these competing explanations. Review representative failures alongside apparently successful locations, and compare observations made under similar conditions. Preserve a separate uncertainty or exclusion layer so that unsupported areas cannot quietly enter summaries as if they had the same evidential strength as reliable observations.
Check known encoded values manually, verify physical units and inspect the invalid-value mask after export. Compare with suitable independent observations while accounting for overpass time and spatial support. Set the acceptance rule before examining the final map. Use independent evidence that represents the difficult conditions as well as the easy ones. Report how many observations passed, which failed and why. A threshold that works in this test area still needs checking before transfer to another landscape or season.
Deliver the exact temperature quantity, original encoding, conversion and output units. Preserve uncertainty and acquisition time so subsequent users cannot mistake the layer for air temperature or daily maximum heat. Package the analytical layer with its quality information and a short reproduction note. Include the acquisition dates, processing assumptions, limitations and responsible reviewer. Preserve stable identifiers across maps and tables so another analyst can trace a reported number back to its inputs and repeat the comparison without guessing the settings.
Interpret the combined evidence
Read the landscape and product sections together before applying the analysis procedure. In this guide, Cocoa agroforestry systems defines the reporting context, while Sentinel-3 SLSTR surface temperature defines the available measurement; Temperature Conversion supplies the processing and review question. These roles are deliberately separate. A working data connection does not establish that the measurement answers the management question. Reject a combination when the target is smaller than the effective observation scale, when the required season has no usable observations, or when the relevant property is not measured by the sensor. Retain that rejection in the project record so that an attractive demonstration does not become an unsupported operational promise.
Acceptance checks before delivery
Write acceptance conditions before inspecting the final map. Specify the reporting boundary, observation period, minimum valid coverage, reference sampling design and the consequence of an incorrect alert. Use project-specific values agreed with the recipient rather than copying a threshold from an unrelated landscape. Keep a small set of independent observations outside all parameter selection. Review omission and commission errors separately and examine boundary areas, rare conditions and missing dates. If the available reference observations do not cover the intended operating conditions, narrow the stated scope of the result instead of claiming that an apparently successful demonstration proves general reliability.
A useful GIS delivery contains more than a colored image. Export the analytical values where licensing permits, the validity mask, reporting geometries with stable identifiers, and a concise record of product names, acquisition dates, processing versions, coordinate reference system and resampling choices. Distinguish valid zero values from missing observations. Provide the area or count of usable measurements for every reporting unit and explain which units were excluded. A colleague should be able to trace a suspicious statistic back to the underlying observation without reconstructing the entire project from screenshots. Store the interpretation and its limits beside the data, not only in a presentation.
Connect the result with an ITSensing workflow
Use the ITSensing satellite catalog and remote sensing tools to evaluate the parts of this workflow that are available for the selected account and data source. Begin with a small representative area and compare the output with a trusted reference before scaling up. The product links below lead to the catalog, tools, documentation and plans so the team can check data access and processing requirements directly. This guide describes an analytical procedure; it does not assert that every named product, algorithm or export format is supplied natively by ITSensing. Where a step uses an external GIS or specialist tool, keep its inputs and outputs in the same reproducibility record.
