# Data Reduction & Astrometry

## Data Reduction with Astropy

* Dark Current: Dark Frame Subtraction
* Flat Field: Flat Frame Division
* Background Subtraction
* Bad/Hot Pixels
* Image alignment and [registration](https://github.com/keflavich/image_registration)

## Plate-solving with Astrometry.net

## World Coordinate System (WCS)

## Photometry with Photutils

* Aperture Photometry
  * Optimizing Aperture Size and Shape
* PSF Photometry
* Treatment of Outliers
  * Weather: Cloud, Humidity, Turbulence
  * Other Unaccounted Effects (Systematics)
  * Saturation
  * Cosmic Rays