Choosing a reference point and recording it

[scottstanie]

• [ ] Pick one of the PS points,
  • [ ] Possible way: take the biggest connected component. Take lowest amplitude dispersion PS pixel within that.
• [ ] Reference the output products to this.
• [ ] Record it in the product here: https://github.com/opera-adt/disp-s1/blob/main/src/disp_s1/product.py#L193-L209
  • Note on this format: currently the scalar "value" is the phase that is subtracted from the image. The attrs of the dataset have the rows/cols. This would just be a list of one row/one col for a single PS point.