QUOTE (PaulH51 @ Mar 8 2021, 05:58 AM)
Andreas,
Nice link for the traverse path JSON. Many thanks
I notice your animated traverse that you show elevation of the terrain around the rover.
Perseverance elevation data is not available in the M20 interactive map geojson files, so I was wondering if you are aware of any external links to the other M20 traverse values such as pitch, roll etc values and especially elevation at each coordinate change that is made available in the Curiosity Rover interactive map geojson files?
Elevation is not hugely interesting in this near flat plain, but it will be of great interest as the rover begins to climb onto the delta and beyond. Any links would be very welcome.
regards,
Paul
The Where is the rover map uses a few more geojson files, see
http://www.unmannedspaceflight.com/index.p...st&p=250647 . The
way points geojson has yaw, pitch roll data.
I just learned about the PDS PLACES database:
http://www.unmannedspaceflight.com/index.p...st&p=250716I think the geojson comes directly from there. There should be elevation (or Z data) but it is not provided in the geojson. I use the 1m HiRISE mosaic DEM linked from:
https://astrogeology.usgs.gov/search/map/Ma...tTs0_lon0_first for querying elevation.
The DEM and the imagery should be very well co-registered. In my animated traverse due to slight 3d perspective viewing the rover appears a little offset from the traverse since it is offset above ground level. If the geojson included elevation, I could use that as well.
Regarding the odometer data, the distances from the geojson may be straight from the rover, using wheel rotations although the coordinates may also be straight from the rover (with subsequent conversion to latitude/longitude). I used projected, equirectangular coordinates to measure distances which is strictly speaking not quite correct but probably still ok at 18 degrees latitude. In any case, it could not explain a >1m discrepancy in distances. Perhaps the geojson distance is the straight line distance between way points, not along the path but this is inconsistent with the last leg which is almost perfectly straight and has the largest difference.