วีดีโอ

Hi Brian, I cannot import the libs of webots such as controller, Robots, Motors, etc although I have configured the environment variables as the tutorials. How can I deal with it? Many thanks!

Hello Brian, Saved the plan text as .py but won't display in webots controller

Also this is cute how old is she

First

hi, could you share code for this particular example or some sources how to that? adamch08@gmail.com

Is the code available??

oh wow thanks for uploading it

Can't I just display the data in ESRI's ArcScene?

cool Brian. good scanning

what awesome work.can you share the code? I am researching lidar recently.it will be helpful to me

can u share the coding that u used for this analysis

Hi, this work is awesome. can you share the code? It's important for my current work

can you share a link to the code or send it to me on my gmail please?

Hi Brian, can I have the MATLAB codes, please?

3:00

Awesome work. Do you have the source code for this ??

Which software please?

Dear Brian, who is the owner of copyrights to this video? Best regards

I would love to see your source code to this if you are sharing publicly.

The model looks amazing.What software was used for this simulation?

Nice work Brian! I did something similar but my visualization is not so nice. I was wondering how you scaled the range values. Thanks

yeah, I would be very interested in the coding for this as well. Cool visualization

May I take a look at your source code? thanks.

Hi Great job :)) can u give me the visualization command ? thank u

Is the source code available?

This is amazing.

Fantastic work! Well done!

you're not sharing the source code??

The inputs are point sources where the concentration is elevated and fixed or a type of random function for varying source concentration. Some of the simulations also use small circular regions instead of points for sources.

what would be the source of input?

So great! It looks like real things. Good job!

Calculating the trajectory is indeed quite difficult, but simply amounts to a whole lot of math in the end. Accounting for the gravity of Earth, Mars, and the Sun (as well as the moon and Jupiter for detailed analyses) and the effects of the spin of the Earth and Mars are all necessary for computing the desired spacecraft trajectory. Timing is critical of course, much like throwing a football to a receiver that is following a pattern, but with solid engineering the vehicle will arrive on target!

The yellow path is the ground track, or rather the position of the spacecraft over the ground (like a shadow), so if you bend it then you also need to bend the surface on which it is plotted (ie. adding the planet's curvature). While I could have plotted the data in a real inertial reference coordinate system, which includes the curvature, it would not look very different since the overall EDL trajectory is relatively small compared to the planet.

I think this answers my question! So I would need to "bend" the yellow path down by 10 degrees at the start point and bend the green path down by some amount also. How on *Mars* do they manage to calculate these paths what with planets orbiting and spinning and gravity and such. Wow!

Thanks for the fast answer! So if you had used a curved Mars for this then would the first 30s of trajectory look identical, more curved or less curved? If I imagine the leading edge of the flat terrain curved down 10 degrees then do I have to "bend" the trajectory down 10 degrees also? I'm just wondering what the true trajectory would have looked like to an observer. Thanks for doing this, it's awesome. I think the guided entry is the unsung hero of this mission - it put us next to the mtn!

Note that the original data is referenced to inertial space with respect to Mars. Longitude, latitude, and altitude are determined after moving into a rotating system to compensate for the planet's spin. Altitude is simply the radial distance from Mars' center to the spacecraft minus the mean radius of Mars. If you computed the laser's path in inertial space and performed the same transformation then it would appear as a curved line with altitude increasing as the beam travels into the distance.

The plot is orthotropic (ie. Mars does appear to be flat), but the x-, y- and z- axes are the true longitude, latitude, and altitude components of position (longitude and latitude are multiplied by mean Mars radius to have units of km). The position is derived from the trajectory which does include the curvature of the planet. The steep curve at the beginning is the atmospheric entry phase, after which the spacecraft begins a horizontal guided phase to align and reach the landing site.

This video starts 594km downrange and 191km altitude. Is there an adjustment for curvature of Mars or have you assumed a 'flat mars'? If I fired a laser horizontally from the curiosity landing site uprange, at 600km, or 10 degrees of a martian great circle, the laser would be at an altitude of 1.5% mars radius above the surface or 53km altitude. I am wondering if the steep curve in trajectory in the first 30 seconds is guided entry or just 'mars not being flat'

at 2:59 sounds like a woman having an orgasm...i guess curiosity will do that to nasa chicks..lol great job

Never! The ISS orbits the Earth at an altitude of about 400 km, while Mars is about 60,000,000 km away when it is closest to the Earth. With ISS having a mass of 450 tons, you'd need about 2,300 tons of rocket fuel just to reach escape velocity

how long till international space station reaches mars from greencatfish52...

Outstanding work !!! Bravo !

That's happened to me before on youtube. Restarting the browser usually fixes the issue; sometimes I need to reboot (old comp) and the audio is fine again. Hope this helps if you encounter this again. :)

so sweet thanks!

I will put together a complete version soon...

Tens meters underground in best case, if you are talking about Martian life.

Good old Data.

Ah nice, I've been using only python/matplotlib for so long I didn't realize it matched so close with Matlab.

The plotting is done using Matlab.

Cool! Agreed, it does look like matplotlib.