
<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Greetings,<div class=""><br class=""></div><div class="">I think you are looking at the IMU record rather than the GPS record. Or, rather, DROP is confusing the two.</div><div class=""><br class=""></div><div class="">You might consider using DatCon to turn the files into CSV and then parsing the CSV files.</div><div class=""><br class=""></div><div class="">Also, what is your use case? Are you doing this as a one off, or do you need to support all of the DJI products? Getting unencrypted log files from newer models is very hard.</div><div class=""><br class=""></div><div class="">Regards,</div><div class=""><br class=""></div><div class="">-David</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div class="">

<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;" class="">David Kovar</span><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">CEO, Founder URSA Inc.</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">Cell: 650-278-1774</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><br class="Apple-interchange-newline"><span><img apple-inline="yes" id="C2685771-6D33-4CEA-AF51-6E2CA54ABECD" src="cid:8993EDD1-F627-4A82-871D-951B696571BD" class=""></span>

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<div><br class=""><blockquote type="cite" class=""><div class="">On Jan 24, 2022, at 10:02 AM, John Burns <<a href="mailto:john@unixnerd.co.uk" class="">john@unixnerd.co.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">I wonder if I'm misunderstanding something basic? I should add I know little about drones as we normally subcontract drone surveys so I don't own one.<br class=""><br class="">I have a drone file FLYxxx.DAT and I've been decoding it, the GPS record I'm using looks like <a href="https://www.google.com/url?q=https://github.com/unhcfreg/DROP/blob/master/modules/GPSPayload.py&source=gmail-imap&ust=1643641383000000&usg=AOvVaw06g7rc93jaSbARXfOF791D" class="">https://www.google.com/url?q=https://github.com/unhcfreg/DROP/blob/master/modules/GPSPayload.py&source=gmail-imap&ust=1643641383000000&usg=AOvVaw06g7rc93jaSbARXfOF791D</a> which seems to have a different format to the GPS(gps#) record on <a href="https://www.google.com/url?q=https://datfile.net/DatCon/fieldsV3.html&source=gmail-imap&ust=1643641383000000&usg=AOvVaw0Zodp1Btkpj6VO6ACcZ0w0" class="">https://www.google.com/url?q=https://datfile.net/DatCon/fieldsV3.html&source=gmail-imap&ust=1643641383000000&usg=AOvVaw0Zodp1Btkpj6VO6ACcZ0w0</a>.<br class=""><br class="">Sorry if this is a stupid question :-)<br class=""><br class="">--<br class="">John G.Burns<br class=""><br class=""><br class="">________________________________________<br class="">From: DJI-log-discuss <<a href="mailto:dji-log-discuss-bounces@us.live555.com" class="">dji-log-discuss-bounces@us.live555.com</a>> on behalf of David Kovar <<a href="mailto:dkovar@ursasecure.com" class="">dkovar@ursasecure.com</a>><br class="">Sent: 24 January 2022 14:31<br class="">To: Discussion of DJI's log file formats<br class="">Subject: Re: [DJI-log-discuss] Getting start time of a DAT file?<br class=""><br class="">Greetings,<br class=""><br class="">DATCon has a good list of all the records and their fields: <a href="https://www.google.com/url?q=https://datfile.net/DatCon/fieldsV3.html&source=gmail-imap&ust=1643641383000000&usg=AOvVaw0Zodp1Btkpj6VO6ACcZ0w0" class="">https://www.google.com/url?q=https://datfile.net/DatCon/fieldsV3.html&source=gmail-imap&ust=1643641383000000&usg=AOvVaw0Zodp1Btkpj6VO6ACcZ0w0</a> (Look for the GPS record.)<br class=""><br class="">Regards,<br class=""><br class="">-David<br class=""><br class="">David Kovar<br class="">CEO, Founder URSA Inc.<br class="">Cell: 650-278-1774<br class=""><br class=""><br class="">[<a href="cid:8993EDD1-F627-4A82-871D-951B696571BD" class="">cid:8993EDD1-F627-4A82-871D-951B696571BD</a>]<br class=""><br class="">On Jan 24, 2022, at 9:09 AM, John Burns <<a href="mailto:john@unixnerd.co.uk" class="">john@unixnerd.co.uk</a><<a href="mailto:john@unixnerd.co.uk" class="">mailto:john@unixnerd.co.uk</a>>> wrote:<br class=""><br class="">Thanks for the reply! If you have more details that would be very helpful. I'm reading a GPS record to get lat/long/height, according to the DROP source code it has many other fields but not time.<br class=""><br class="">--<br class="">John G.Burns<br class=""><br class=""><br class="">________________________________________<br class="">From: DJI-log-discuss <<a href="mailto:dji-log-discuss-bounces@us.live555.com" class="">dji-log-discuss-bounces@us.live555.com</a><<a href="mailto:dji-log-discuss-bounces@us.live555.com" class="">mailto:dji-log-discuss-bounces@us.live555.com</a>>> on behalf of David Kovar <<a href="mailto:dkovar@ursasecure.com" class="">dkovar@ursasecure.com</a><<a href="mailto:dkovar@ursasecure.com" class="">mailto:dkovar@ursasecure.com</a>>><br class="">Sent: 24 January 2022 14:06<br class="">To: Discussion of DJI's log file formats<br class="">Subject: Re: [DJI-log-discuss] Getting start time of a DAT file?<br class=""><br class="">Greetings,<br class=""><br class="">There is a GPS record with the real world timestamp (in UTC, I think.) You can work backwards from that to get the start time of the logging.<br class=""><br class="">If you need more detail, let me know.<br class=""><br class="">Regards,<br class=""><br class="">-David<br class=""><br class="">David Kovar<br class="">CEO, Founder URSA Inc.<br class="">Cell: 650-278-1774<br class=""><br class=""><br class="">[<a href="cid:8993EDD1-F627-4A82-871D-951B696571BD" class="">cid:8993EDD1-F627-4A82-871D-951B696571BD</a>]<br class=""><br class="">On Jan 24, 2022, at 8:39 AM, John Burns <<a href="mailto:john@unixnerd.co.uk" class="">john@unixnerd.co.uk</a><<a href="mailto:john@unixnerd.co.uk" class="">mailto:john@unixnerd.co.uk</a>><<a href="mailto:john@unixnerd.co.uk" class="">mailto:john@unixnerd.co.uk</a>>> wrote:<br class=""><br class="">Hello. I've managed to write some Java code to import DAT files into my specialist GIS package. I'm struggling with time though.<br class=""><br class="">I can see that time increments in milliseconds come from the "tick"/600, but I can't find any way of getting the start time of logging. I've been using the DROP (<a href="https://www.google.com/url?q=https://www.google.com/url?q%3Dhttps://www.google.com/url?q%253Dhttps://github.com/unhcfreg/DROP%2526source%253Dgmail-imap%2526ust%253D1643636411000000%2526usg%253DAOvVaw2XT1gUceOqvTjo3pKDC-NM%26source%3Dgmail-imap%26ust%3D1643638221000000%26usg%3DAOvVaw2HZifjtTYycqVrMleSEzgF&source=gmail-imap&ust=1643641383000000&usg=AOvVaw1HMql7OP7gQvvf9dtuEaOk" class="">https://www.google.com/url?q=https://www.google.com/url?q%3Dhttps://www.google.com/url?q%253Dhttps://github.com/unhcfreg/DROP%2526source%253Dgmail-imap%2526ust%253D1643636411000000%2526usg%253DAOvVaw2XT1gUceOqvTjo3pKDC-NM%26source%3Dgmail-imap%26ust%3D1643638221000000%26usg%3DAOvVaw2HZifjtTYycqVrMleSEzgF&source=gmail-imap&ust=1643641383000000&usg=AOvVaw1HMql7OP7gQvvf9dtuEaOk</a>) python software as my guide in this. It seems to use the file's OS time stamp with the obvious problems that entails.<br class=""><br class="">Any help is appreciated :-)<br class=""><br class="">--<br class="">John G.Burns<br class=""><br class=""><br class="">--<br class="">DJI-log-discuss mailing list<br class=""><a href="mailto:DJI-log-discuss@lists.live555.com" class="">DJI-log-discuss@lists.live555.com</a><<a href="mailto:DJI-log-discuss@lists.live555.com" class="">mailto:DJI-log-discuss@lists.live555.com</a>><<a href="mailto:DJI-log-discuss@lists.live555.com" class="">mailto:DJI-log-discuss@lists.live555.com</a>><br class=""><a href="https://www.google.com/url?q=https://www.google.com/url?q%3Dhttps://www.google.com/url?q%253Dhttp://ns.live555.com/mailman/listinfo/dji-log-discuss%2526source%253Dgmail-imap%2526ust%253D1643636411000000%2526usg%253DAOvVaw1EysAdNxCc6pvEUAYUewLp%26source%3Dgmail-imap%26ust%3D1643638221000000%26usg%3DAOvVaw3VwKE88b9uySNMYJiZJGVQ&source=gmail-imap&ust=1643641383000000&usg=AOvVaw3CEyRH_f_OyGunrG-Blykf" class="">https://www.google.com/url?q=https://www.google.com/url?q%3Dhttps://www.google.com/url?q%253Dhttp://ns.live555.com/mailman/listinfo/dji-log-discuss%2526source%253Dgmail-imap%2526ust%253D1643636411000000%2526usg%253DAOvVaw1EysAdNxCc6pvEUAYUewLp%26source%3Dgmail-imap%26ust%3D1643638221000000%26usg%3DAOvVaw3VwKE88b9uySNMYJiZJGVQ&source=gmail-imap&ust=1643641383000000&usg=AOvVaw3CEyRH_f_OyGunrG-Blykf</a><br class=""><br class=""><URSA-Logo-email.png>--<br class="">DJI-log-discuss mailing list<br class="">DJI-log-discuss@lists.live555.com<mailto:DJI-log-discuss@lists.live555.com><br class="">https://www.google.com/url?q=https://www.google.com/url?q%3Dhttp://ns.live555.com/mailman/listinfo/dji-log-discuss%26source%3Dgmail-imap%26ust%3D1643638221000000%26usg%3DAOvVaw1EMqZjkC5zggcAT6cQvLiO&source=gmail-imap&ust=1643641383000000&usg=AOvVaw2RhbuUqlaD8z7JlTMnEsqK<br class=""><br class=""><span id="cid:8993EDD1-F627-4A82-871D-951B696571BD"><URSA-Logo-email.png></span>-- <br class="">DJI-log-discuss mailing list<br class="">DJI-log-discuss@lists.live555.com<br class="">https://www.google.com/url?q=http://ns.live555.com/mailman/listinfo/dji-log-discuss&source=gmail-imap&ust=1643641383000000&usg=AOvVaw1LPoG6EeNfVJ2krFI01JOY<br class=""></div></div></blockquote></div><br class=""></div></body></html>