Interpolation and gridding
Definition
The process of estimating values between measured points to create a continuous surface or image from discrete survey transects. Common algorithms include kriging, minimum curvature, and triangulation. The grid resolution must be appropriate to the data spacing or interpolation will invent detail.
Related terms
- Anomaly confidence tier
- A risk-based classification of geophysical anomalies as high, medium, or low priority for excavation based on how closely each anomaly matches the...
- Cheetham 2005 framework
- A published methodological framework (Cheetham, P. 2005, Forensic Geophysical Survey) that sets out survey standards, processing requirements, anomaly classification criteria, and report...
- De-striping
- A processing operation that equalises the mean value across adjacent survey lines in magnetometry or resistivity data, removing banded artefacts caused by...
- Migration (GPR)
- A processing algorithm that collapses hyperbolic reflections back to their true point positions. Migration requires a velocity model; with the correct velocity...
- Zero-time correction
- A GPR processing step that aligns all traces to a consistent time-zero at the ground surface, removing the slight variation in the...
Explained in
- Geophysical Data Processing and InterpretationThe process of estimating values between measured points to create a continuous surface or image from discrete survey transects. Common algorithms include krig...