# Sanity Check and Filtering

First step of the data processing chain.

### Field Boundaries

Field boundaries are determined using either the alpha algorithm (alphashape) with the alpha parameter equal to the number of coordinates:

or, if the alpha shape algorithm is not successful, the ConvexHull algorithm:

The dataset is discarded if the area inside the field boundaries is less than 200 square metres.

### Dataset Size

The dataset is discarded if the total number of usable data points in the data set is less than 100.

### Averaging

The median value in each spectrum (HH, VV, HV, and VH) is calculated.

Total power, polarized power, and unpolarized power are calculated:

### Filtering

The data point is discarded if the total power for an integration exceeds 400 Kelvin or is less than 50 Kelvin.

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