What to do after the closure of Midnight Mars Browser? |
What to do after the closure of Midnight Mars Browser? |
Nov 30 2019, 04:59 PM
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#1
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Member Group: Members Posts: 112 Joined: 20-August 12 From: Spain Member No.: 6597 |
I've been a heavy user of Midnight Mars Browser for several years and I'm incredibly grateful for the work that Michael has done.
Now I ask myself, should we create again an alternative way to look and search for images coming from Mars? In the last several months I developed a way to ingest InSight images in order to have a small database and a telegram bot that tells me when a new image is uploaded to the InSight web site and I can try to do the same with the MSL imagery. But, I have several questions: What is the better way to show the data in the web page? Which is the best way to order the images? I'd love to hear some suggestions for that. Greetings. |
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Feb 2 2021, 11:47 AM
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#2
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Junior Member Group: Members Posts: 95 Joined: 11-January 07 From: Amsterdam Member No.: 1584 |
Not sure where this will lead to but I've had some succes adding unbayered Mastcam images to Marslife. (not yet available for public use)
The official JSON files come without extra information for Mastcam images so I use the camera pointing data from Spice. Most Mastcam images match pretty well with the Navcam environment but there are others (especially earlier on in the mission) where the positioning is way off. To improve the positioning and scaling of Mastcam images, the subframerect information is also needed. Since this information is not available in the JSON files maybe someone here can help and tell me if and/or how the Mastcam subframe information can be extracted from Spice data? Thanks! Rob -------------------- |
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Feb 2 2021, 05:19 PM
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#3
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
To improve the positioning and scaling of Mastcam images, the subframerect information is also needed. Since this information is not available in the JSON files maybe someone here can help and tell me if and/or how the Mastcam subframe information can be extracted from Spice data? AFAIK it can't be -- the SPICE only describes the RSM pointing, not what subframes are being acquired. As a general rule, a subframe is going to be roughly centered on the boresight, exceptions being images of the cal target, sun, moons, etc. You could perhaps back it out on an image basis if the subframe contained recognizable pieces of crud on the sensor, but that's pretty gross. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Feb 2 2021, 10:14 PM
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#4
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
You could perhaps back it out on an image basis if the subframe contained recognizable pieces of crud on the sensor, but that's pretty gross. This is more or less what I did when I implemented a hot column remover for my deBayering algorithm. The ML sensor column 1070 is hot starting from row 33, but on subframes it will usually be different columns and rows of course. I simply looked at the hot columns on several resolutions of ML images and made a list. Eg, on 1328x1184 ML frames the hot column starts at 910,17, which implies the subframe is (161,17,1328,1184). You don't need to look at defects/crud to do this though - just go through old images that do have json subframeRect values and make a lookup table of resolutions vs subframeRect values. This won't always work though: eg, resolution 1536x1152 is associated with subframeRect (17,17,1536,1152) and (65,33,1536,1152), although the latter seem to be limited to rover deck images. Anyway, this approach was sufficient for me to remove the hot columns from almost all ML frames. |
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