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"""Simulate metadata service until it is implemented.
"""
def get_instrument(observatory, start_time=None, end_time=None, metadata=None):
"""Get instrument metadata
Args:
observatory: observatory code
start_time: start time to match, or None to match any.
end_time: end time to match, or None to match any.
metadata: use custom list, defaults to _INSTRUMENT_METADATA
Returns:
list of matching metadata
"""
metadata = metadata or _INSTRUMENT_METADATA
return [
m
for m in metadata
if m["station"] == observatory and
(end_time is None or
m["start_time"] is None or
m["start_time"] < end_time) and
(start_time is None or
m["end_time"] is None or
m["end_time"] > start_time)
]
"""
To make this list easier to maintain:
- List NT network stations first, then other networks in alphabetical order
- Within networks, alphabetize by station, then start_time.
"""
_INSTRUMENT_METADATA = [
{
"network": "NT",
"station": "BDT",
"start_time": None,
"end_time": None,
"instrument": {
"type": "FGE",
"channels": {
# each channel maps to a list of components to calculate nT
# TODO: calculate these lists based on "FGE" type
"U": [{"channel": "U_Volt", "offset": 0, "scale": 313.2}],
"V": [{"channel": "V_Volt", "offset": 0, "scale": 312.3}],
"W": [{"channel": "W_Volt", "offset": 0, "scale": 312.0}],
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},
"electronics": {
"serial": "E0542",
# these scale values are used to convert voltage
"x-scale": 313.2, # V/nT
"y-scale": 312.3, # V/nT
"z-scale": 312.0, # V/nT
"temperature-scale": 0.01, # V/K
},
"sensor": {
"serial": "S0419",
# these constants combine with instrument setting for offset
"x-constant": 36958, # nT/mA
"y-constant": 36849, # nT/mA
"z-constant": 36811, # nT/mA
},
},
},
{
"network": "NT",
"station": "LLO",
"start_time": None,
"end_time": None,
"instrument": {
"type": "Narod",
"channels": {
"U": [
{"channel": "U_Volt", "offset": 0, "scale": 100},
{"channel": "U_Bin", "offset": 0, "scale": 500},
],
"V": [
{"channel": "V_Volt", "offset": 0, "scale": 100},
{"channel": "V_Bin", "offset": 0, "scale": 500},
],
"W": [
{"channel": "W_Volt", "offset": 0, "scale": 100},
{"channel": "W_Bin", "offset": 0, "scale": 500},
],
},
},
},
]