Paegan attempts to fill the need for a high level common data model (CDM) library for array based met/ocean data stored in netCDF files or distributed over OPeNDAP.

from paegan.cdm.dataset import CommonDataset
url = "http://thredds.axiomalaska.com/thredds/dodsC/PWS_DAS.nc"
pd = CommonDataset.open(url)

#####Bbox

pd.restrict_bbox((-74, 40, -70, 42))

#####Time

from datetime import datetime,timedelta
ending = datetime.utcnow()
starting = ending - timedelta(hours=12)
pd.restrict_time((starting, ending))

#####Depth

pd.restrict_depth((3,50))

#####Variables

pd.restrict_vars(("u","v"))

#####Time

from datetime import datetime
import pytz
now = datetime.utcnow().replace(tzinfo=pytz.utc)
pd.nearest_time(now)

#####Depth

pd.nearest_depth(5)

You are using virtualenv, right?

1. Install virtualenv-burrito
2. Create virtualenv named "paegan-dev": mkvirtualenv -p your_python_binary paegan-dev
3. Start using your new virtualenv: workon paegan-dev

Paegan requires python 2.7.x and is available on PyPI.

The best way to install Paegan is through pip:

pip install paegan

Paegan requires the following python libraries which will be downloaded and installed through pip:

• numpy==1.6.2
• netCDF4==1.0.2 (requires netcdf and hdf5 C libraries)
• Shapely==1.2.17 (requires geos C library)
• pytz==2012h
• python-dateutil==2.1

If your NetCDF4 and HDF5 libraries are in non-typical locations, you will need to pass the locations to the pip command:

NETCDF4_DIR=path HDF5_DIR=path pip install paegan

There seems to be a problem installing numpy through pip so you may need to install numpy before doing any of the above:

pip install numpy==1.6.2

• CF-1.6 Discrete Sampling Geometry support
• Better grid support
• Regridding tools

Other modules making use of Paegan

• paegan-transport - Parallelized Lagrangian transport model for NetCDF/OPeNDAP data
• paegan-viz - Visualization tools for NetCDF/OPeNDAP data

If you are having trouble getting any of the paegan functionality to work, try running the tests:

git clone git@github.com:asascience-open/paegan.git`
cd paegan
pip install pytest
python runtests.py

• Kyle Wilcox kwilcox@asascience.com
• Alex Crosby acrosby@asascience.com