cygrid 0.9

Cygrid is a cython-powered convolution-based gridding module for astronomy

# Introduction #

• Version: 0.9

• Authors: Benjamin Winkel, Lars Flöer, Daniel Lenz

# Purpose#

cygrid allows to resample a number of spectra (or data points) to a regular grid - a data cube - using any valid astronomical FITs/WCS projection (TODO link).

The method is a based on serialized convolution with finite gridding kernels. Currently, only Gaussian (radial-symmetric or elliptical) kernels are provided (which has the drawback of slight degradation of the effective resolution). The algorithm has very small memory footprint, allows easy parallelization, and is very fast.

# Features

• Supports any WCS projection system as target.

• Conserves flux.

• Low memory footprint.

• Scales very well on multi-processor/core platforms.

# Usage #

### Installation ###

Right now, the installation should be done from source. Download the repository and simply execute

` python setup.py install `

In the future, we will make sure you can use pip to install the package.

### Dependencies ###

We kept the dependencies as minimal as possible. The following packages are required: * numpy 1.10 or later * cython 0.23.4 or later * astropy 1.0 or later

(Older versions of these libraries may work, but we didn’t test this!)

### Examples ###

Check out the ipython notebooks in the repository for some examples of how to use cygrid. In addition to the cygrid dependencies, you will need healpy to run these.

### Who do I talk to? ###

If you encounter any problems or have questions, do not hesitate to raise an issue or make a pull request. Moreover, you can contact the devs directly:

• <[e-mail]>

• <[e-mail]>

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