analitics

Pages

Thursday, February 25, 2021

Python 3.9.1 : Python and Spectator Earth.

The Spectator Earth allows you to track satellites, access their imagery, and easily build new information, based on data from this amazing orbital infrastructure.
You need just an API KEY to use it with cURL, Python, or JavaScript. 
In this tutorial, I will show you how can be used.
Login on the app.spectator.earth and get your API Key. 
Let's see some simple examples.
This first example shows you the satellite by id:
import requests

id = input("Type id sattelite: ")
satellite_id = id
url = 'https://api.spectator.earth/satellite/{satellite_id}'.format(satellite_id=satellite_id)

response = requests.get(url)
data = response.json()
print(data)
Let's see some satellite by ids:
[mythcat@desk Spectator]$ python  satellite_all.py 
Type id sattelite: 1
{'id': 1, 'type': 'Feature', 'geometry': {'type': 'Point', 'coordinates': [-51.88851761326367, 
70.75978200389422]}, 'properties': {'name': 'Sentinel-1A', 'norad_id': 39634, 'sensors': 
[{'type': 'SAR', 'avg_footprint_width': '3.20'}], 'open': True, 'platform': 'Sentinel-1A'}}
[mythcat@desk Spectator]$ python  satellite_all.py 
Type id sattelite: 2
{'id': 2, 'type': 'Feature', 'geometry': {'type': 'Point', 'coordinates': [42.046601163641796, 
-14.660442921557335]}, 'properties': {'name': 'Sentinel-2A', 'norad_id': 40697, 'sensors': 
[{'type': 'OPTICAL', 'avg_footprint_width': '2.32'}], 'open': True, 'platform': 'Sentinel-2A'}}
[mythcat@desk Spectator]$ python  satellite_all.py 
Type id sattelite: 3
{'id': 3, 'type': 'Feature', 'geometry': {'type': 'Point', 'coordinates': [-91.98478583784988, 
79.45732380441011]}, 'properties': {'name': 'Sentinel-3A', 'norad_id': 41335, 'sensors': 
[{'type': 'OPTICAL', 'avg_footprint_width': '10.16'}, {'type': 'OPTICAL', 
'avg_footprint_width': '11.20'}], 'open': True, 'platform': 'Sentinel-3A'}}
[mythcat@desk Spectator]$ python  satellite_all.py 
Type id sattelite: 4
Let's see one example with satellite overpasses:
import requests
import json
api_key = input("api_key :")
bbox = '19.59,49.90,20.33,50.21'
satellites = 'Sentinel-2A,Sentinel-2B'
url = 'https://api.spectator.earth/overpass/?api_key={api_key}&bbox={bbox}&
satellites={satellites}'.format(api_key=api_key, bbox=bbox, satellites=satellites)
response = requests.get(url)
data = response.json()
print(type(data))
print(data)
You can query for overpasses of the chosen satellite over a defined area of interest and the output provides you with a satellite sensor footprint for the nearest overpass, overpass frequency in seconds, and all information available.
Query parameters for the URL variable are:
The result is this:
[mythcat@desk Spectator]$ python satellite.py 
api_key :....
...
{'frequency': 93996, 'overpasses': [{'id': 16486437, 'acquisition': True, 'date': 
'2021-02-26T09:57:00Z', 'footprint': {'type': 'Polygon', 'coordinates': 
...
footprint': {'type': 'Polygon', 'coordinates': 
...
[[[19.153675312697636, 46.847554078717884], ... 
Query parameters for the url :
  • api_key - your API key
  • bbox - area of interest bounding box list of coords (lon, lat, lon, lat);
  • satellites - which satellites to include like: (Sentinel-1A, Sentinel-1A, Sentinel-2A, Sentinel-2B, Sentinel-3A, Landsat-8) - optional;
  • days_before - a number of days before the current date for which overpasses should be computed integer optional, default=0;
  • days_after - a number of days after the current date for which overpasses should be computed integer optional, default=7;
You can see a image get from my location: