LR1 Payload Output Specification
The standard workflow for mapping with Astro takes photos from the camera, geotags them, and writes them to the attached USB stick. The usb stick will contain data from each flight in separate folders.
Photos can be saved to either SD card or USB drive. When photos are saved to the SD card, no geotag is applied. However, all other files will be written to USB drive if one is connected.
Naming: <SequentialFlightNumber>_<DATE>_<TIME>
There may be multiple folders that start with the same <SequentialFlightNumber>
if photos were taken on the ground but without a flight.
Each folder will contain the following:
This file contains the GNSS observations from the aircraft's RTK GPS, and is used in conjunction with the base station data to precisely locate the Astro in space. The file also includes RTKlib-style "marker" entries at the timestamp when each photo was taken
This JSON formatted file includes the precise timestamp and gimbal angle for each photo captured.
This JSON formatted file includes the aircraft position, attitude, timestamp, and capture url for each photo taken.
Name: YYYY-MM-DD-[SequentialNumber matching directory].json
File type: JPG
Naming: per camera settings
Geotags: Each photo is geotagged in its EXIF header, including geographic position and altitude in WGS84 (GPS) coordinate frame. The altitude in the aircraft geotags is based on the EGM96 geoid.
Note that additional tag information may be written later when post processed by a PPK app.
This folder contains small 512x341 thumbnails of the photos taken. They are geotagged as well, and are sometimes useful to upload to a photo photogrammetry site such as ESRI Sitescan to ensure that photos are geotagged as expected. They can even be used to create a quick, coarse map.