get all orbits between two dates

all_the_orbits.py

import requests
from pathlib import Path
from datetime import date, timedelta
from requests.auth import HTTPBasicAuth
import xml.etree.ElementTree as ET
import os

def save_all_orbits(date_str, platformnumber, producttype, result_path, session):

    base_url = f"https://scihub.copernicus.eu/gnss/search?q=platformname:Sentinel-1 AND platformnumber:{platformnumber} AND producttype:{producttype} AND beginposition:[{date_str}T00:00:000Z TO {date_str}T24:00:000Z]"
    start = 0 
    rows = 10
    url = f'{base_url}&start={start}&rows={rows}'
    response = session.get(url, auth=HTTPBasicAuth('gnssguest', 'gnssguest'))
    root = ET.fromstring(str(response.text))
    num_results=root.findall('{http://a9.com/-/spec/opensearch/1.1/}totalResults')[0].text
    print(f"Found results for {platformnumber} {producttype} {date_str}: {num_results}")
    while start < int(num_results):
        url = f'{base_url}&start={start}&rows={rows}'
        response = session.get(url, auth=HTTPBasicAuth('gnssguest', 'gnssguest'))
        root = ET.fromstring(str(response.text))
        entries = root.findall('{http://a9.com/-/spec/opensearch/1.1/}totalResults')
        for elem in root.findall('{http://www.w3.org/2005/Atom}entry'):
            start = start +1
            title = elem.findall('{http://www.w3.org/2005/Atom}title')[0].text
            for at in elem:
                if at.tag == '{http://www.w3.org/2005/Atom}link':
                    if 'rel' in at.attrib:
                        continue
                    href = at.attrib['href']
                    local_filename = result_path/Path(producttype[4:len(producttype)])/Path(f'S1{platformnumber}')/Path(date_str[0:4])/Path(date_str[5:7])/Path(title).with_suffix('.EOF')
                    local_filename.parent.mkdir(parents=True, exist_ok=True)
                    with session.get(href, stream=True, auth=HTTPBasicAuth('gnssguest', 'gnssguest')) as r:
                        r.raise_for_status()
                        with open(local_filename, 'wb') as f:
                            for chunk in r.iter_content(chunk_size=8192): 
                                f.write(chunk)
                                    


home = os.environ['HOME'] 
result_path = Path(f'{home}/.snap/auxdata/Orbits/Sentinel-1/')
result_path.mkdir(parents=True, exist_ok=True)
start_date = date(2021, 1, 1)
end_date = date(2021, 5, 31)
delta = timedelta(days=1)
session = requests.session()
while start_date <= end_date:

    date_str = start_date.strftime("%Y-%m-%d")
    save_all_orbits(date_str, "A", "AUX_RESORB", result_path, session)
    save_all_orbits(date_str, "B", "AUX_RESORB", result_path, session)
    save_all_orbits(date_str, "A", "AUX_POEORB", result_path, session)
    save_all_orbits(date_str, "B", "AUX_POEORB", result_path, session)
    start_date += delta