Methods and analysis
Time-Series Gap Filling: Estimates Must Remain Distinct from Observations
Gap filling estimates missing values from neighboring dates, locations or a model.
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THE ITSENSING JOURNAL
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Practical satellite reviews, remote sensing methods and GIS workflows. Explore the science, understand the limits, and take your next project into iT Sensing.
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Satellite reviews
Landsat 1 Review: Measurements, Products and Practical GIS Use
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Methods and analysis
Pan-Sharpening Satellite Imagery: Visual Detail and Spectral Integrity
Pan-sharpening combines a finer panchromatic observation with coarser multispectral bands to produce a sharper-looking color product.
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Methods and analysis
Atmospheric Aerosols and Coastal Reflectance: Reading the Quality Evidence
Aerosol scattering can alter optical reflectance and its correction is especially important for dark water and subtle spectral contrasts.
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Methods and analysis
Data Cubes for Remote Sensing: Consistent Grids and Honest Time Axes
A data cube organizes observations along spatial, temporal and often spectral dimensions.
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Methods and analysis
Radiometric Saturation: When Bright Pixels Stop Measuring Change
Radiometric saturation occurs when a sensor or encoded product cannot represent a larger signal within its supported range.
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Methods and analysis
Spatial Resolution Versus Mapping Scale: Avoiding Invented Detail
Pixel spacing describes a grid, while effective spatial resolution and measurement support describe the information captured.
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Methods and analysis
Reproducible Remote Sensing Pipelines: Parameters, Versions and Evidence
A reproducible pipeline preserves the inputs, transformations and parameters needed to explain a result.
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Methods and analysis
SAR Backscatter Calibration: Digital Numbers, Sigma Naught and Gamma Naught
SAR backscatter measures microwave scattering toward the instrument under a defined geometry.
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Methods and analysis
SAR Decibels Versus Linear Power: Correct Averaging and Ratios
Decibels express a logarithmic representation of power: 10 times the base-10 logarithm of the linear quantity.
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Methods and analysis
SAR Speckle Filtering: Noise Reduction Without Erasing Targets
Speckle arises from coherent scattering and is part of SAR image formation.
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Methods and analysis
SAR Terrain Correction: Geolocation and Radiometric Effects
Side-looking radar records slant-range geometry, so terrain affects where a return appears and how bright it is.
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Methods and analysis
Layover and Radar Shadow: Mapping Where SAR Cannot Support a Claim
Layover mixes returns when elevated targets arrive earlier than lower ground, while radar shadow receives no direct illumination from the viewing geometry.
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