Latest Contributions by City_ofGlendale__CA

Late to the party, but i had a similar issue.  DJI drone had altitude reading offset by 50 meters.  I used this python script to adjust the exif tag instead of re-flying the mission.  Hope it can help other people.    -Edit.  Provided additional script to adjust XMP header as well.  Turns out Drone2Map will read XMP data instead of EXIF when xmp is available.  However it should be run on Linux unless you want to compile exempi on windows.  I used a Vbox image for this.   ## piexif, python3.7 import glob import piexif from fractions import Fraction def to_deg(value, loc): """convert decimal coordinates into degrees, munutes and seconds tuple Keyword arguments: value is float gps-value, loc is direction list ["S", "N"] or ["W", "E"] return: tuple like (25, 13, 48.343 ,'N') """ if value < 0: loc_value = loc[0] elif value > 0: loc_value = loc[1] else: loc_value = "" abs_value = abs(value) deg = int(abs_value) t1 = (abs_value-deg)*60 min = int(t1) sec = round((t1 - min)* 60, 5) return (deg, min, sec, loc_value) def change_to_rational(number): """convert a number to rantional Keyword arguments: number return: tuple like (1, 2), (numerator, denominator) """ f = Fraction(str(round(number,4))) return (f.numerator, f.denominator) def change_to_decimal(fraction): """convert fraction tuple to decimal keyword arguments: fraction -- tuple like (numerator, denominator) return: float""" return (fraction[0]/fraction[1]) def set_gps_location(file_name, lat, lng, altitude): """Adds GPS position as EXIF metadata Keyword arguments: file_name -- image file lat -- latitude (as float) lng -- longitude (as float) altitude -- altitude (as float) """ lat_deg = to_deg(lat, ["S", "N"]) lng_deg = to_deg(lng, ["W", "E"]) exiv_lat = (change_to_rational(lat_deg[0]), change_to_rational(lat_deg[1]), change_to_rational(lat_deg[2])) exiv_lng = (change_to_rational(lng_deg[0]), change_to_rational(lng_deg[1]), change_to_rational(lng_deg[2])) gps_ifd = { piexif.GPSIFD.GPSVersionID: (2, 0, 0, 0), piexif.GPSIFD.GPSAltitudeRef: 1, piexif.GPSIFD.GPSAltitude: change_to_rational(round(altitude)), piexif.GPSIFD.GPSLatitudeRef: lat_deg[3], piexif.GPSIFD.GPSLatitude: exiv_lat, piexif.GPSIFD.GPSLongitudeRef: lng_deg[3], piexif.GPSIFD.GPSLongitude: exiv_lng, } exif_dict = {"GPS": gps_ifd} exif_bytes = piexif.dump(exif_dict) piexif.insert(exif_bytes, file_name) def change_gps_altitude(file_name, delta_altitude): exif_dict = piexif.load(file_name) gps_altitude = exif_dict['GPS'][piexif.GPSIFD.GPSAltitude] gps_altitude = change_to_rational(change_to_decimal(gps_altitude)+delta_altitude) print("altitude: " + str(gps_altitude)) exif_dict['GPS'][piexif.GPSIFD.GPSAltitude] = gps_altitude exif_bytes = piexif.dump(exif_dict) piexif.insert(exif_bytes, file_name) ##End Utility Functions delta_altitude = 47.97 path = "C:\\Users\\tli\\Pictures\\Drone2Map_Pilot\\" file_list = [f for f in glob.glob(path + "**/*.JPG", recursive=True)] for file_name in file_list: print("Processing: " + file_name) change_gps_altitude(file_name, delta_altitude) ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ XMP adjust # This script needs to run on linux due to dependencies on exempi library # python-xmp-toolkit, python 3.6 from libxmp import XMPFiles, consts import glob def change_xmp_altitude(file_name, delta_altitude): xmpfile = XMPFiles(file_path=file_name, open_forupdate=True) xmp = xmpfile.get_xmp() # list the uri for prefix drone-dji # xmp_sub = xmp.get_namespace_for_prefix("drone-dji") dji_uri = "http://www.dji.com/drone-dji/1.0/" xmp_absalt = xmp.get_property(dji_uri, "AbsoluteAltitude") str_translation = dict.fromkeys(map(ord, '+'), None) xmp_absalt = xmp_absalt.translate(str_translation) xmp_absalt = "+" + str(round(float(xmp_absalt) + delta_altitude, 2)) xmp.set_property(dji_uri, "AbsoluteAltitude", xmp_absalt) if xmpfile.can_put_xmp(xmp): xmpfile.put_xmp(xmp) xmpfile.close_file() print(xmp_absalt, "New XMP Altitude Entered for: ", file_name) delta_altitude = 47.97 path = "/home/tli/COG/Drone2MapTest" file_list = [f for f in glob.glob(path + "**/*.JPG", recursive=True)] for file_name in file_list: print("Processing: " + file_name) change_xmp_altitude(file_name, delta_altitude) ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ ... View more

It is now almost 2018, I have only seen how people get around it in custom development by basically listening to click event and doing buffer on the user clicked point.  How do I achieve this with WAB?  Is there a setting I missed?  Nor do I see where I can access the source code generated via ftp where I can basically overwrite the function...  ... View more