LOC_SOURCE_ENUM = {
    0:"LOC_UNSET",
    1:"LOC_MANUAL",
    2:"LOC_INTERNAL",
    3:"LOC_EXTERNAL"
}

ALT_SOURCE_ENUM = {
    0:"ALT_UNSET",
    1:"ALT_MANUAL",
    2:"ALT_INTERNAL",
    3:"ALT_EXTERNAL",
    4:"ALT_BAROMETRIC"
}

POSITION_SCHEME = [
    ("sfixed32", "latitude_i", 1),
    ("sfixed32", "longitude_i", 2),
    ("int32", "altitude", 3),
    ("fixed32", "time", 4),
    ("int32", "location_source", 5),
    ("int32", "altitude_source", 6),
    ("fixed32", "timestamp", 7),
    ("int32", "timestamp_millis_adjust", 8),
    ("sint32", "altitude_hae", 9),
    ("sint32", "altitude_geoidal_separation", 10),
    ("uint32", "PDOP", 11),
    ("uint32", "HDOP", 12),
    ("uint32", "VDOP", 13),
    ("uint32", "gps_accuracy", 14),
    ("uint32", "ground_speed", 15),
    ("uint32", "ground_track", 16),
    ("uint32", "fix_quality", 17),
    ("uint32", "fix_type", 18),
    ("uint32", "sats_in_view", 19),
    ("uint32", "sensor_id", 20),
    ("uint32", "next_update", 21),
    ("uint32", "seq_number", 22),
    ("uint32", "precision_bits", 23)
]