# RowTransform

### Related Doc: package reproject

#### object RowTransform

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4. #### def approximate(transform: Transform, errorThreshold: Double): RowTransform

Computes an approximate transformation of a row.

Computes an approximate transformation of a row.

Based on GDALApproxTransform. Assumes that the number of elements in the row is greater than 5. Should only be used when the line being transformed is roughly linear.

transform

The transformation that we are approximating

errorThreshold

maximum error measured in input pixels that is allowed in approximating the transformation (0.0 for exact calculations).

Note

This algorithm does not garuntee all values will be within the error threshold of the exactly transformed values. In practice, as long as the line is roughly linear, it should be at least very close if over the error threshold away from the actual values.

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9. #### def exact(transform: Transform): RowTransform

Transform each point exactly.

Transform each point exactly. Assumes user has taken care to make all array dimensions equal.

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