Healpix python documentation pdf

Python is an easy to learn objectoriented programming language, which combines power with clear syntax. To this end, we make use of the algorithms integrated into the highperformance collection of network analysis tools python igraph0. It has modules, classes, exceptions, very high level data types, and dynamic typing. Mocpy provides the moc and timemoc classes handling respectively the manipulation of spatial and temporal mocs. It is maintained by the same community that maintains python. We used python implementation of healpix, healpy for creating and. A bestpractice handbook to the installation, configuration, and usage of python. To understand healpix better, we will start from the beginning. This shows a pixelization with nside 4, that is, each of the 12 large regions has 4 x 4 pixels, for a total of 192 pixels. Documentationtools describes tools you can use to generate documentation for your own python programs. See the healpix idl documentfor more information on using healpix.

In order to work with nested ordering, all map related functions support the nest keyword, for example. See the conda documentation for more details on managing environments, installing packages, etc. The healpix primer local1remote2 healpix facility installation guidelines localremote. Jupyter lab, then you can activate the toast environment and install them with conda. Healpix was developed to efficiently process cosmic microwave background data from cosmology experiments like boomerang and wmap but it is now used in other. Micropython runs on a variety of systems and hardware platforms. Pythonpythonpython python python python pythonpython cpythoncpuccpu mp3c0. Drawing maps in this section we describe the most complex part of the library, that is the code that produces a graphical representation of a map.

In each of these languages are available an extensive library of healpix specific tools and their supporting routines as well as a suite of programs implementing the key features of healpix. Successful installation produces a set of facilities using. Get started here, or scroll down for documentation broken out by type and subject. If you want to use pysm with toast for sky simulations, you should install the pysm3 and libsharp packages. To better understand the difficulties of such task, let us consider how this is accomplished by the standard healpix library and by healpy, a python wrapper to healpix. The documentation contains a few examples of how to do the reprojection and the plotting. Netis a package which provides near seamless integration of a natively installed python installation with the. You might also find the reproject package useful, which allows you to reproject healpix maps onto smaller regions.

My interest in healpix is pretty much entirely in its equal area pixel setup, and how a single latitudelongitude reference can result in a single pixel reference unlike mgrs which can have overlapping grid points. Running the code below in a regular python session will not display the maps. Maps are simply numpy arrays, where each array element refers to a location in the sky as defined by the healpix pixelization schemes see the healpix website note. The healpix nside parameter, must be a power of 2, less than 230.

This is the inverse approach to that taken by ironpython see above, to which it is more complementary than competing with. The healpix documentation is currently available for downloading in pdf and can be browsed in html. George, paul sokolovsky, and contributors july 02, 2017. The reproject package supports a number of different algorithms for reprojection interpolation, fluxconserving reprojection, etc. Contribute to jdhp docspython documentation development by creating an account on github. Pdf healpix, an acronym for hierarchical equal area isolatitude. The pixelisation algorithm was devised in 1997 by krzysztof m. As for the pure python idea, even if i could just figure out how to slim down the healpix software to only two. One quick way to get a python environment with everything needed to work on astropyhealpix code, run tests, build docs is like this. Mar 20, 2009 python 3 reference manual python documentation manual part 2. Dear healpix user, the latest version of the healpix package 3. The 12 fundamental sky divisions can be seen, as well as the hierarchical nature of the smaller pixels.

The numbers in the table are the size of the download files in kilobytes. Here you can read the general documentation which applies to all systems, as well as specific information about the various platforms also known as ports that micropython runs on. Complete documentation of the package can be found at. As an example, here is the sky coverage of the sdss sky survey. Data analysis, simulations and visualization on the sphere. To download an archive containing all the documents for this version of python in one of various formats, follow one of links in this table. Based on the healpix sky tessellation, it maps regions on the sky into hierarchically grouped predefined cells. The top panel shows healpix pixels in nested order. These archives contain all the content in the documentation. For more information, we encourage you to read the full documentation below. Healpix sometimes written as healpix, an acronym for hierarchical equal area isolatitude pixelisation of a 2sphere, refers to either an algorithm for pixelisation of the 2sphere or to the associated class of map projections. Healpix python overview html only 1opens pdf le found in current working directory, if available.

Healpix fortran90 facilities user guidelines localremote. Some previous versions of the documentation remain available online. Here i will focus on f90, idl and python routines mainly. Pyzine published from 2002 to 2005, the archived articles are now available for viewing online without a subscription. If we want to make a density sky plot, we would like to pass healpy a 1d numpy array where each value represents the density at a location of the sphere, where the location is determined by the array size the healpix level and the offset the location. Healpix was developed to efficiently process cosmic microwave background data from cosmology experiments like boomerang and wmap but it is now used in other branches. Python s documentation, tutorials, and guides are constantly evolving. Healpix is an acronym for hierarchical equal area isolatitude pixelization of a sphere. Python developers guide documentation this guide is a comprehensive resource for contributing topython for both new and experienced contributors. Software for pixelization, hierarchical indexation, synthesis, analysis, and visualization of data on the sphere. For unreleased in development documentation, see in development versions. Python journal published around 2002, the archived articles are available online.