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Scripts to process HORIZONS ephemeris data
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| import re | |
| import os | |
| import csv | |
| import json | |
| import sys | |
| import StringIO | |
| import dateutil.parser | |
| import datetime | |
| def main(inputFile): | |
| base = os.path.basename(inputFile) | |
| name = os.path.splitext(base)[0] | |
| file = open(inputFile, "rU") | |
| data = file.read() | |
| starSplit = data.split("*******************************************************************************") | |
| csvHeader = starSplit[5].replace(" ", "").replace("\n", "") | |
| csvStart = data.split("$$SOE")[1] | |
| csvBody = csvStart.split("$$EOE")[0] | |
| csvAll = StringIO.StringIO(csvHeader + "\r" + csvBody) | |
| csvReader = csv.DictReader(csvAll,delimiter=',') | |
| csvRows = list(csvReader) | |
| months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; | |
| # strip the space | |
| for row in csvRows: | |
| #strip all values | |
| for key, value in row.iteritems(): | |
| row[key] = value.strip() | |
| # change the date key | |
| row["date"] = row.pop("CalendarDate(TDB)") | |
| row["date"] = row["date"].replace("A.D. ", "").replace(".0000", ""); | |
| # e.g.: 1997-Oct-15 12:00:00.0000 to 1997-10-15 12:00:00.0000 | |
| for i, d in enumerate(months): | |
| idx = "0" + str(i+1) if len(str(i+1)) == 1 else str(i+1) | |
| row["date"] = row["date"].replace(d, idx) | |
| # reduce the precision a little | |
| row["X"] = float(format(float(row["X"]), '.10f')) | |
| row["Y"] = float(format(float(row["Y"]), '.10f')) | |
| row["Z"] = float(format(float(row["Z"]), '.10f')) | |
| del row["JDTDB"] | |
| del row[""] | |
| ## write to file if this is called independently on the commandline | |
| if __name__ == "__main__": | |
| jsonfile = open('src/ngm-assets/data/'+name+'.json', 'w') | |
| jsonfile.write(json.dumps(csvRows,indent=4)) | |
| jsonfile.close() | |
| else: | |
| return csvRows | |
| file.close() | |
| ## is this running from commandline? | |
| if __name__ == "__main__": | |
| main(sys.argv[1]) |
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