sealev

sealev

Allows to access various Sea Level Databases via python.

Installation

To install the package use the command:

pip install sealev

After the installation, it is possible to use the package in python:

python

List of available databases: getDB()

Once you are in python environment you can give the following collamnds

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
#
# get the list of available database sources:
dbs=sl.getDBs()
#
for db in dbs:
   print(db)

You will get a list of all the database that you can query.

LIst the devices of a database: getDevs(<database>)

You can select one specific database, i.e. DART, and requst the list of available devices:

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
darts=sl.getDevs('DART')
#
for dart in darts:
    print(dart['id'],dart['location'],format(dart['lat'])+'/'+format(dart['lon']))
#

The response will be:

21413 Station 21413 - SOUTHEAST TOKYO - 700NM ESE of Tokyo, JP 30.492/152.085
21414 Station 21414 - AMCHITKA - 170 NM South of Amchitka, AK 48.97/178.165
21415 Station 21415 - ATTU - 175 NM South of Attu, AK 50.12/171.867
21416 Station 21416 - KAMCHATKA PENINSULA - 240NM SE of Kamchatka Peninsula, RU 48.12/163.43
21418 Station 21418 - NORTHEAST TOKYO - 450 NM NE of Tokyo, JP 38.73/148.8
...
56003 Station 56003 - Indian Ocean 2     -     630km NNE of Dampier -15.019/118.073

The response if a list of devices; each device is a dictionary composed of:

• id identifier of the device (will be used to retrieve data)
• location place of the device
• country country of the device
• lat/lon coordinates of the device
• [group] if it exists it represents a subclass of the database

the keyword 'id' contains the reference identifier to retrieve the level data.

Retrieve sea level of a device: getLevel(<database>,<device>, [<tmin>],[<tmax>])

Suppose you want to retrieve the level values of one specific device, such as 21414 (Station 21414 - AMCHITKA - 170 NM South of Amchitka), you can give the following command:

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
values=sl.getLevel('DART','21414')
for j in range(len(values['x'])):
    print(values['x'][j],values['y'][j])

The response of the example above is a list of data if the device has recent recorded data:

2024-10-02 00:00:00 5442.868
2024-10-02 00:15:00 5442.874
2024-10-02 00:30:00 5442.882
2024-10-02 00:45:00 5442.891
2024-10-02 01:00:00 5442.897
...

You can retrieve data from the past adding the keyword tmin, tmax in the getLevel call. Example

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
values=sl.getLevel('GLOSS @vliz','mnza','2022-09-19 00:00:00','2022-09-21 00:00:00')
for j in range(len(values['x'])):
    print(values['x'][j],values['y'][j])

The example above retrieves and print the data related to the Tsunami event in Mexico.

The response is a dctionary containing the following keys:

• x (list) containing a series of datatime values representing the time of the level
• y (list) containing a series of sea level values of the device (m) each point of the x list will have a corresponding point in y In the example above, if you have setup the matplotlib package (pip install matplotlib), you can plot the quantities with the commands:

import matplotlib.pyplot as plt
plt.plot(values['x'],values['y'])
plt.xlabel('Date/Time')
plt.ylabel('Level (m)')
plt.title('M7.6 MEXICO, 2022-09-19 18:05:00')
plt.show()

The following plot would be generated:

As another example, let's show the Hurricane Helene 2024 at Clearwater Beach (USA)

from sealev.sldb import seaLevelDB
import matplotlib.pyplot as plt

sl=seaLevelDB()
values=sl.getLevel('GLOSS @vliz','cwfl','2024-09-24 00:00:00','2024-09-29 00:00:00')

plt.plot(values['x'],values['y'])
plt.xlabel('Date/Time')
plt.ylabel('Level (m)')
plt.title('Clearwater Beach (FL), Cyclone Helene-24')
plt.show()

the output will be:

Export to csv file: to_csv(values,fnameout)

After having retrieved the values dictionary, you can export in a csv file. Example

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
values=sl.getLevel('GLOSS @vliz','mnza','2022-09-19 00:00:00','2022-09-21 00:00:00')
sl.to_csv(values,'output.csv')

Extract other quantities

In some cases (i.e. JRC_TAD database), many other quantities are retrieved from the database in addition to the level. In these cases the available keys are many more thabn x and y, that however always eist. The other quantities can also be retrieved. The xample below collects the data of Cadiz (IDSL-06) from the JRC database and creates a plot of the battery voltage.

import matplotlib.pyplot as plt
from sealev.sldb import seaLevelDB
sl=seaLevelDB()
#
values=sl.getLevel('JRC_TAD','IDSL-06','2024-10-03 00:00:00','2024-10-08 00:00:00')
print('List of possible quantities to plot:',values.keys())
plt.plot(values['x'],values['anag3'])
plt.xlabel('Date/Time')
plt.ylabel('Battery voltage (volt)')
plt.title('Cadiz device IDSL-06')
plt.show()

The output plot is the folllowing:

Search a sea level station

By keyword: search(<db>,word=<keyword>)

To search a device using the name or the id as keyword use the search command:

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
details=sl.search('NOAA TC','Clearwater')
print('detail=',detail)

the reply will be:

detail= [{'location': 'Clearwater Beach', 'id': '8726724', 'lat': 27.978333, 'lon': -82.831667, 'country': '', 'group': ''}]

By distance from a point: search(<db>,pointDistKM=<PD>)

PD is a list of (lat,lon,distKM) Suppose you want to search all the devices within 300 km from the point lat=26.131667, lon=-81.8075. PD=(26.131667, -81.8075, 300)

from sealev import seaLevelDB
sl=seaLevelDB()

db='NOAA TC' 
listDevs=sl.search(db,pointDistKM=(26.131667, -81.8075, 300))
for dev in listDevs:
	print(dev['id'],dev['location'])

the response will be:

8722670 Lake Worth Pier, Atlantic Ocean
8722956 South Port Everglades
8723214 Virginia Key
8723970 Vaca Key, Florida Bay
8724580 Key West
8725114 Naples Bay, North
8725520 Fort Myers
8726384 Port Manatee
8726520 St. Petersburg
8726607 Old Port Tampa
8726674 East Bay
8726724 Clearwater Beach

Plot a device using id: plot(<db>,<devID>,[<tmin>],[<tmax>])

This command will perform the plot as shown above.

from sealev.sldb import seaLevelDB
sl=seaLevelDB()
details=sl.search('NOAA TC','Clearwater')
id=details[0]['id']
sl.plot('NOAA TC',id,'2024-10-05 00:00:00','2024-10-11 00:00:00')

Get a map of a list of devices: sl.mapDevs(<devList>)

If you want to see where the list of devices is located you can use the mapDevs option. Example

from sealev import seaLevelDB
sl=seaLevelDB()

db='NOAA TC'
#create a list of devices as shown in the search example above 
listDevs=sl.search(db,pointDistKM=(26.131667, -81.8075, 300))
# map the devices
sl.mapDevs(listDevs)

This script will provide the following image: