CDDIS Archive Search

Get basic metadata on all CDDIS Collections

• provider_short_name: CDDIS
• page_size=200: used to limit size of responses for larger queries
• pretty=true: used to make output have human readable spacing

> curl "https://cmr.earthdata.nasa.gov/search/collections?provider_short_name=CDDIS&page_size=200&pretty=true"

Get metadata on CDDIS Collections for GNSS Hourly Data

• provider_short_name: CDDIS
• pretty=true: used to make output have human readable spacing
• keyword=GNSS*Data*daily*: limits search to only datasets that have 'GNSS', 'Data' and 'daily' in their metadata

> curl "https://cmr.earthdata.nasa.gov/search/collections?provider_short_name=CDDIS&pretty=true&keyword=GNSS*Data*daily*"

Get metadata on CDDIS Collections of type DORIS

• provider_short_name: CDDIS
• pretty=true: used to make output have human readable spacing
• keyword=*DORIS*Product*: limits search to only datasets that have 'DORIS' and 'Product' in their metadata
• page_size=200: used to limit size of responses for larger queries
• %5B: URL Encoding for '['
• %5D: URL Encoding for ']'

> curl "https://cmr.earthdata.nasa.gov/search/collections?provider_short_name=CDDIS&short_name=*DORIS*Product*&options%5Bshort_name%5D%5Bpattern%5D=true&page_size=200&pretty=true"

Get metadata on CDDIS Collections for GNSS Hourly Data

• collection_concept_id: Specify one CDDIS Collection to query, this would be found using one of the Collection queries shown above
• production_date: Limit to those granules produced in a particular date range, in this example July 1, 2022 from 00:00 to 23:59:59
• pretty=true: used to make output have human readable spacing

> curl "https://cmr.earthdata.nasa.gov/search/granules?collection_concept_id=C1423712525-CDDIS&pretty=true&production_date=2022-07-01T00:00:00Z,2202-07-01T23:59:59Z

Save the following source code to a file such as: myCDDIS_Script.py

#--------------------------------------------------------------------
import requests
from xml.dom.minidom import parse, parseString

url = 'https://cmr.earthdata.nasa.gov/search/collections?provider_short_name=CDDIS&page_size=200'

r = requests.get(url)
document = parseString(r.content)
elements = document.getElementsByTagName('name')
for element in elements:
print(element.firstChild.nodeValue)

#--------------------------------------------------------------------

Execute the script by running: python3 myCDDIS_Script.py

Save the following source code to a file such as: myCDDIS_Script.py

#--------------------------------------------------------------------
import requests
from xml.dom.minidom import parse, parseString

url = 'https://cmr.earthdata.nasa.gov/search/collections?provider_short_name=CDDIS&keyword=VLBI&page_size=200'

r = requests.get(url)
document = parseString(r.content)
elements = document.getElementsByTagName('name')
for element in elements:
print(element.firstChild.nodeValue)

#--------------------------------------------------------------------

Execute the script by running: python3 myCDDIS_Script.py

Download all DORIS Granules for Collection CDDIS_DORIS_data_daily that have been updated in the last 24 hours

Save the following source code to a file such as: myCDDIS_Script.py

#--------------------------------------------------------------------
import requests
import sys
from xml.dom.minidom import parse, parseString
from datetime import date
from datetime import timedelta

# Yesterday date
yesterday = date.today() - timedelta(days = 1)

r = requests.get(https://cmr.earthdata.nasa.gov/search/granules?collection_concept_id=C1538795709-CDDIS&updated_since=' + str(yesterday) + '&page_size=20')

document = parseString(r.content)
elements = document.getElementsByTagName('location')
granuleLocations = []
granuleURLS = []

for element in elements:

granuleLocations.append(element.firstChild.nodeValue)
for granuleLocation in granuleLocations:
granuleDoc = parseString(requests.get(granuleLocation).content)
urls = granuleDoc.getElementsByTagName('URL')
for url in urls:
if 'https' in url.firstChild.nodeValue:
# Assigns the local file name to the last part of the URL
filename = url.firstChild.nodeValue.split('/')[-1]
print('Downloading: ' + str(url.firstChild.nodeValue))
fileContents = requests.get(url.firstChild.nodeValue)


# Opens a local file of same name as remote file for writing to
with open(filename, 'wb') as fd:
for chunk in fileContents.iter_content(chunk_size=1000):
fd.write(chunk)


# Closes local file
fd.close()

#--------------------------------------------------------------------

Execute the script by running: python3 myCDDIS_Script.py