# Atmosphere Models (atmosphere)¶

Models of the atmosphere useful for transforming between column densities (atmosphere depths $$X$$, in units of mass per area) and heights (in distance above sea-level units).

## Reference/API¶

### ctapipe.atmosphere Module¶

Atmosphere density models and functions to transform between column density (X in grammage units) and height (meters) units.

Zenith angle is taken into account in the line-of-sight integral to compute the column density X assuming Earth as a flat plane (the curvature is not taken into account)

#### Classes¶

 Base class for models of atmosphere density. A simple functional density profile modeled as an exponential. Tabular profile from a table that has both the density and it’s integral pre-computed. CORSIKA 5-layer atmosphere model