More sophisticated object-oriented AWS data processing

[PennyHow]

Currently the pypromice.process.AWS object holds all of the information and functions for processing data from a level 0 to level 3 standard. The object largely holds processing parameters, which are inputted and passed as object attributes on initialisation, namely:

1. The station config parameters
2. The standard variables formatting
3. The metadata formatting and content

pypromice/src/pypromice/process/aws.py

Lines 26 to 65 in c5613a9

	class AWS(object):
	'''AWS object to load and process PROMICE AWS data'''
	def __init__(self, config_file, inpath, var_file=None, meta_file=None):
	'''Object initialisation
	Parameters
	----------
	config_file : str
	Configuration file path
	inpath : str
	Input file path
	var_file: str, optional
	Variables look-up table file path. If not given then pypromice's
	variables file is used. The default is None.
	meta_file: str, optional
	Metadata info file path. If not given then pypromice's
	metadata file is used. The default is None.
	'''
	assert(os.path.isfile(config_file))
	assert(os.path.isdir(inpath))
	print('\nAWS object initialising...')
	# Load config, variables CSF standards, and L0 files
	self.config = self.loadConfig(config_file, inpath)
	self.vars = getVars(var_file)
	self.meta = getMeta(meta_file)
	# Hard-wire the msg_lat and msg_lon here
	# Prevents having to list these vars in the individual station toml files
	config_keys = list(self.config.keys())
	for i in config_keys:
	self.config[i]['columns'].extend(['msg_lat', 'msg_lon'])
	# Load config file
	L0 = self.loadL0()
	self.L0=[]
	for l in L0:
	n = getColNames(self.vars, l.attrs['number_of_booms'], l.attrs['format'])
	self.L0.append(popCols(l, n))

This object could be more sophisticated, with each sensor represented as an object and therefore a weather station and its data processing represented as a set of sensor objects. In doing so, we could better adapt to different station types and perhaps the pypromice package could be more applicable to other projects and groups.

This is a long-term goal rather than a quick fix, but thought it best to just put it here in order to exchange ideas, document progress etc.