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igs_ftp.py
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igs_ftp.py
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"""
This file is part of ppp-tools, https://github.com/aewallin/ppp-tools
GPLv2 license.
Library for downloading GPS products (orbits & clocks) from
an IGS datacenter.
Anders Wallin, 2013-2015
"""
import ftplib
import datetime
import sys
import os
import ftp_tools
import gpstime
# ftp://cddis.gsfc.nasa.gov/gnss/data/daily/
# YYYY/DDD/YYn/brdcDDD0.YYn.Z (merged GPS broadcast ephemeris file)
def cddis_brdc_file(dt, prefixdir=""):
"""
This was used previously for rtklib runs.
Could be replaced with a nav-file from the station?
"""
server = "cddis.gsfc.nasa.gov"
remotedir = "gnss/data/daily/%d/brdc" % dt.year
doy = dt.timetuple().tm_yday
f = "brdc%03d0.%dn.Z" % (doy, dt.year-2000)
# YYYY/brdc/brdcDDD0.YYn.Z
localdir = prefixdir + "/stations/brdc/"
ftp_tools.check_dir(localdir)
ftp_tools.ftp_download(server, username="anonymous", password="",
remotedir=remotedir, remotefile=f, localdir=localdir)
return localdir+f
def get_IGS_rapid(dt, prefixdir=""):
(server, username, password, directory, files,
localdir) = IGS_rapid_files(dt, prefixdir)
(clk1, eph1, erp1) = download(
server, username, password, directory, files, localdir)
return (clk1, eph1, erp1)
def get_IGS_final(dt, prefixdir=""):
(server, username, password, directory, files,
localdir) = IGS_final_files(dt, prefixdir)
(clk1, eph1, erp1) = download(
server, username, password, directory, files, localdir)
return (clk1, eph1, erp1)
def get_CODE_final(dt, prefixdir=""):
(server, username, password, directory, files,
localdir) = CODE_final_files(dt, prefixdir)
(clk1, eph1, erp1) = download(
server, username, password, directory, files, localdir)
return (clk1, eph1, erp1)
def get_CODE_rapid(dt, prefixdir=""):
(server, username, password, directory, files,
localdir) = CODE_rapid_files(dt, prefixdir)
(clk1, eph1, erp1) = download(
server, username, password, directory, files, localdir)
return (clk1, eph1, erp1)
def CODE_rapid_files(dt, prefixdir=""):
"""
retrieve rapid CODE products for the datetime dt
Products are stored in <prefixdir>/products/CODE_rapid/
Examples of Rapid files: (FIXME: old paths!)
ftp://ftp.unibe.ch/aiub/CODE/COD17840.EPH_R ephemeris aka orbits
ftp://ftp.unibe.ch/aiub/CODE/COD17840.ERP_R erp, earth rotation parameters
ftp://ftp.unibe.ch/aiub/CODE/COD17840.CLK_R clk, clocks
updated working link (as of 2021 July)
ftp://ftp.aiub.unibe.ch/CODE/
"""
server = "ftp.aiub.unibe.ch"
remotedir = "CODE/"
week = gpstime.gpsWeek(dt.year, dt.month, dt.day)
dow = gpstime.dayOfWeek(dt.year, dt.month, dt.day)
clk = "COD%s%s.CLK_R" % (week, dow)
sp3 = "COD%s%s.EPH_R" % (week, dow)
erp = "COD%s%s.ERP_R" % (week, dow)
print("CODE rapid products for %d-%02d-%0d" % (dt.year, dt.month, dt.day))
print("CLK = ", clk)
print("SP3 = ", sp3)
print("ERP = ", erp)
ftp_tools.check_dir(prefixdir + "/products/")
localdir = prefixdir + "/products/CODE_rapid/"
print("local dir = ", localdir)
# return CODE_download(server, directory, [clk, sp3, erp], localdir)
return (server, "", "", remotedir, [clk, sp3, erp], localdir)
def CODE_final_files(dt, prefixdir=""):
"""
retrieve final CODE products for the datetime dt
files are in:
ftp://ftp.aiub.unibe.ch/CODE/2021/
"""
server = "ftp.aiub.unibe.ch"
remotedir = "CODE/%s/" % (dt.year)
week = gpstime.gpsWeek(dt.year, dt.month, dt.day)
dow = gpstime.dayOfWeek(dt.year, dt.month, dt.day)
clk = "COD%s%s.CLK.Z" % (week, dow) # clock
sp3 = "COD%s%s.EPH.Z" % (week, dow) # orbit
erp = "COD%s%s.ERP.Z" % (week, dow) # earth
print("CODE final products for %d-%02d-%0d" % (dt.year, dt.month, dt.day))
print("CLK = ", clk)
print("SP3 = ", sp3)
print("ERP = ", erp)
ftp_tools.check_dir(prefixdir + "/products/")
localdir = prefixdir + "/products/CODE_final/"
print("local dir = ", localdir)
return (server, "", "", remotedir, [clk, sp3, erp], localdir)
def IGS_rapid_files(dt, prefixdir=""):
"""
retrieve rapid IGS products for the datetime dt
files are in:
ftp://gssc.esa.int/gnss/products/<gpsWeek>/
WWWW/igrWWWWD.sp3.Z Satellite orbit solution
WWWW/igrWWWWD.erp.Z Earth orientation parameter solution
WWWW/igrWWWWd.clk_30.Z Satellite and station clock solution (30 second)
"""
week = gpstime.gpsWeek(dt.year, dt.month, dt.day)
dow = gpstime.dayOfWeek(dt.year, dt.month, dt.day)
#server = "gssc.esa.int"
#remotedir = "gnss/products/%d/" % (week)
server = "igs.ensg.ign.fr"
remotedir = "pub/igs/products/%d/" % (week)
#clk = "igs%s%s.clk_30s.Z" % (week, dow) # clock, 30s interval
#clk = "igs%s%s.clk.Z" % (week, dow) # clock, (5 minute interval?)
#server = "gssc.esa.int"
#week = gpstime.gpsWeek(dt.year, dt.month, dt.day)
#dow = gpstime.dayOfWeek(dt.year, dt.month, dt.day)
#remotedir = "gnss/products/%d/" % (week)
clk = "igr%s%s.clk.Z" % (week, dow) # clock
sp3 = "igr%s%s.sp3.Z" % (week, dow) # orbit
erp = "igr%s%s.erp.Z" % (week, dow) # earth rotation parameters, 7 = weeklys
print("IGS rapid products for %d-%02d-%0d" % (dt.year, dt.month, dt.day))
print("CLK = ", clk)
print("SP3 = ", sp3)
print("ERP = ", erp)
ftp_tools.check_dir(prefixdir + "/products/")
localdir = prefixdir + "/products/IGS_rapid/"
print("local dir = ", localdir)
return (server, "", "", remotedir, [clk, sp3, erp], localdir)
def IGS_final_files(dt, prefixdir=""):
"""
retrieve final IGS products for the datetime dt
files are in:
ftp://gssc.esa.int/gnss/products/<gpsWeek>/
ftp://igs.ensg.ign.fr/pub/igs/products/2160/
WWWW/igsWWWWD.sp3.Z Satellite orbit solution
WWWW/igsWWWWD.erp.Z Earth orientation parameter solution
WWWW/igsWWWWd.clk_30.Z Satellite and station clock solution (30 second)
"""
week = gpstime.gpsWeek(dt.year, dt.month, dt.day)
dow = gpstime.dayOfWeek(dt.year, dt.month, dt.day)
#server = "gssc.esa.int"
#remotedir = "gnss/products/%d/" % (week)
server = "igs.ensg.ign.fr"
remotedir = "pub/igs/products/%d/" % (week)
clk = "igs%s%s.clk_30s.Z" % (week, dow) # clock, 30s interval
#clk = "igs%s%s.clk.Z" % (week, dow) # clock, (5 minute interval?)
sp3 = "igs%s%s.sp3.Z" % (week, dow) # orbit
erp = "igs%s%s.erp.Z" % (week, 7) # earth rotation parameters, 7 = weeklys
print("IGS final products for %d-%02d-%0d" % (dt.year, dt.month, dt.day))
print("CLK = ", clk)
print("SP3 = ", sp3)
print("ERP = ", erp)
ftp_tools.check_dir(prefixdir + "/products/")
localdir = prefixdir + "/products/IGS_final/"
print("local dir = ", localdir)
return (server, "", "", remotedir, [clk, sp3, erp], localdir)
def download(server, username, password, remotedir, files, localdir):
"""
Download a list of files from given ftp server
Return list of local downloaded files
"""
print("download start ", datetime.datetime.now())
ftp_tools.check_dir(localdir)
for f in files:
local_file = localdir+f
ftp_tools.ftp_download(
server, username, password, remotedir, f, localdir)
print("download Done ", datetime.datetime.now())
sys.stdout.flush()
output = []
for f in files:
output.append(localdir+f)
return output # returns list of local files: [CLK, EPH, ERP]
def example_igs_ftp():
current_dir = os.getcwd()
# example of how to use the functions:
# rapid products avaible with 2(?) days latency
dt_rapid = datetime.datetime.now() - datetime.timedelta(days=3)
# final product worst case latency 14 days ?
dt_final = datetime.datetime.now() - datetime.timedelta(days=15)
(server, username, password, directory, files,
localdir) = CODE_final_files(dt_final, prefixdir=current_dir)
files = download(server, username, password,
directory, files, localdir)
print(files) # [CLK, EPH, ERP] note that final products are zipped
(server, username, password, directory, files,
localdir) = CODE_rapid_files(dt_rapid, prefixdir=current_dir)
files = download(server, username, password,
directory, files, localdir)
print(files) # [CLK, EPH, ERP] rapid products are unzipped
"""
sample output:
CODE final products for 2015 - 5 - 25
CLK = COD18461.CLK.Z
SP3 = COD18461.EPH.Z
ERP = COD18461.ERP.Z
local dir = /home/anders/ppp-tools/CODE_final/
CODE rapid products for 2015 - 5 - 25
CLK = COD18461.CLK_R
SP3 = COD18461.EPH_R
ERP = COD18461.ERP_R
local dir = /home/anders/ppp-tools/CODE_rapid/
"""
if __name__ == "__main__":
example_igs_ftp()