Comments (3)
GClunies
commented on May 30, 2024
1
@wrightky deleting my previous comment so it does not mislead others.
TLDR - try using product=hourly_height instead of product=water_level.
The issue here is that while the CO-OPS API product hourly_height is available prior to 1996 ...
from pprint import pprint
import noaa_coops as nc
station = nc.Station("8771510")
hourly_height = station.get_data(
begin_date="19951201 00:00",
end_date="19951231 00:00",
product="hourly_height",
datum="MSL",
units="english",
time_zone="gmt",
)
pprint(hourly_height)
# hourly_height sigma flags
# date_time
# 1995-12-01 00:00:00 -0.207 0.0 0,0
# 1995-12-01 01:00:00 -0.016 0.0 0,0
# 1995-12-01 02:00:00 0.223 0.0 0,0
# 1995-12-01 03:00:00 0.384 0.0 0,0
# 1995-12-01 04:00:00 0.535 0.0 0,0
# ... ... ... ...
# 1995-12-27 19:00:00 -1.476 0.0 0,0
# 1995-12-27 22:00:00 -1.375 0.0 0,0
# 1995-12-27 23:00:00 -0.886 0.0 0,0
# 1995-12-30 17:00:00 0.673 0.0 0,0
# 1995-12-30 19:00:00 0.692 0.0 0,0... the product water_level is NOT available. NOAA confirmed that no station has water levels prior to 1996. I am adding some checks on the arguments provided to station.get_data() and updating the error messages when the API returns no data, particularly for water level data so that the user is directed to try the hourly_height product instead.
water_level = station.get_data(
begin_date="19951201 00:00",
end_date="19951231 00:00",
product="water_level",
datum="MSL",
units="english",
time_zone="gmt",
)
# Traceback (most recent call last):
# File "/Users/gclunies/Repos/noaa_coops/noaa_coops/station.py", line 1023, in <module>
# data2 = station.get_data(
# File "/Users/gclunies/Repos/noaa_coops/noaa_coops/station.py", line 693, in get_data
# df = self._make_api_request(data_url, product)
# File "/Users/gclunies/Repos/noaa_coops/noaa_coops/station.py", line 425, in _make_api_request
# raise COOPSAPIError(message=err_msg)
# noaa_coops.station.COOPSAPIError: CO-OPS API returned an error: No data was found. This product may not be offered at this station at the requested time.
#
# NOTE: `water_levels` product is only available from 1996 and onwards.So what you see in the CO-OPS website is data for the hourly_height product, not water_level. In fact, the API completely ignores the interval parameter when requesting water_level data which is always reported on the 6-min interval.
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wrightky
commented on May 30, 2024
Ah! This makes perfect sense, and seems obvious in retrospect. I did not realize there was a formal distinction in the API between "hourly water level" and "hourly height" – not a super user-friendly distinction, but at least a simple one to fix. Looking back at the data inventory, I can see now that 6-minute water levels start on 1996-01-01, which should have been a clue as to what was happening.
Thank you for looking into this, I'm glad that the solution is straightforward. If possible, I suppose it would be a helpful enhancement if the combined choices of product='water_level', interval='h', and date<1996 would auto-redirect to a request for hourly_height, but an informative error message would also do the job. Thanks again!
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GClunies
commented on May 30, 2024
addressed in #47
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