THE ITSENSING JOURNAL
Practical satellite reviews, remote sensing methods and GIS workflows. Explore the science, understand the limits, and take your next project into iT Sensing.
Landsat Collection 2 Level-2 surface reflectance commonly uses a multiplicative factor of 0.0000275 and an additive offset of minus 0.2.
A QA band encodes multiple conditions in bits rather than a single continuous confidence score.
Cloud boundaries can contaminate nearby observations through haze, adjacency and imperfect classification.
A cloud shadow reduces surface illumination and can resemble dark water, burned ground or shaded terrain.
Slopes facing toward or away from the sun receive different illumination.
A surface can reflect different amounts of light toward different viewing directions.
Combining Landsat and Sentinel-2 can increase observation opportunities, but their band responses, grids, geometry and processing differ.
Co-registration aligns observations of the same ground locations.
Resampling estimates values on a different grid.
Nodata means that a value is unavailable or invalid under the dataset definition.
A temporal median reduces the influence of some extreme observations, but it is a summary across dates rather than an image of one instant.
A best-pixel composite selects observations according to a score such as cloud distance, date proximity or viewing conditions.
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