Author Topic: China releases new Chang'e-2 image and elevation data  (Read 917 times)

Offline onebigmonkey

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China releases new Chang'e-2 image and elevation data
« on: April 15, 2018, 04:49:29 PM »
China have updated their data release and put out a 7m resolution orthophotograph collection and 20m resolution dem.

Despite it being like back on dial up again naturally I am all over it, and here is a first look at the tile covering Apollo 17's site, which I derived by increasing the dpi, adjusting levels and sharpening:



The red circle marks the location of the LM, which I determined by matching up an LRO view of the site.

Here's the site - you need to register and it is very slow:

http://moon.bao.ac.cn/index_en.jsp

Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #1 on: April 16, 2018, 02:04:56 AM »
Apollo 15:



Offline BertieSlack

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Re: China releases new Chang'e-2 image and elevation data
« Reply #2 on: April 16, 2018, 05:14:55 AM »
The red circle marks the location of the LM, which I determined by matching up an LRO view of the site.

So that’s Camelot top left?

Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #3 on: April 16, 2018, 05:50:24 AM »
Yes.

China seen to take all their images at local noon, which isn't ideal. There's also a lot of image degradation thanks to my treatment of them, but once you know it's there you can make out the dark spot on the raw images.

Offline bknight

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Re: China releases new Chang'e-2 image and elevation data
« Reply #4 on: April 16, 2018, 08:24:28 AM »
What is the scale of the drawing?
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Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #5 on: April 16, 2018, 08:42:00 AM »
What is the scale of the drawing?

The Apollo 15 one is about 2.5 km across, Apollo 17 about 1.5 km.

Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #6 on: April 16, 2018, 10:55:33 AM »
Apollo 16



There are two dark areas inside the circle here. The one on the left corresponds with the location of the LM, the one on the right the LRV.

Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #7 on: April 16, 2018, 05:44:07 PM »
Apollo 14


Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #8 on: April 16, 2018, 06:03:58 PM »
Apollo 12

« Last Edit: April 16, 2018, 06:06:15 PM by onebigmonkey »

Offline ajv

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Re: China releases new Chang'e-2 image and elevation data
« Reply #9 on: April 16, 2018, 06:25:44 PM »
Apollo 12
Is Surveyor visible or am I just imagining a splodge where it should be?

Offline bknight

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Re: China releases new Chang'e-2 image and elevation data
« Reply #10 on: April 16, 2018, 06:27:35 PM »
Apollo 12
Is Surveyor visible or am I just imagining a splodge where it should be?

Should be in the lower right hand corner of the crater.
Truth needs no defense.  Nobody can take those footsteps I made on the surface of the moon away from me.
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Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #11 on: April 17, 2018, 01:46:26 AM »
Apollo 12
Is Surveyor visible or am I just imagining a splodge where it should be?

There's definitely something there in the right place. Technically what we're seeing is the disturbed surface rather than the objects themselves.

Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #12 on: April 17, 2018, 11:35:15 AM »
Last but by no means least, Apollo 11.



Not unexpectedly, there is little here I would be prepared to bet my mortgage on. The red circle covers the LM and Little West crater. If I've positioned things correctly, the green circle encompasses the activity area around the LM, with the LM exactly in the centre of it.

It's interesting that the amount of dark area visible on these Chinese images is pretty much proportional to the amount of EVA activity around the LM, so I am not in the least surprised that there is little detectable sign for this one. I include it for the record :)

Offline Luke Pemberton

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Re: China releases new Chang'e-2 image and elevation data
« Reply #13 on: April 17, 2018, 03:17:08 PM »
Most interesting checking these against the LRO images and the positions of the craters relative to the LM.

Thanks OBM.
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Offline onebigmonkey

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Re: China releases new Chang'e-2 image and elevation data
« Reply #14 on: April 17, 2018, 03:58:18 PM »
My pleasure :)

I've uploaded cropped versions of the CE-2 files to a dropbox folder so people can play around for themselves. These are completely untreated, just cut down to size:

https://www.dropbox.com/sh/ctwlawf6qt723uz/AAASRn6gQLrDuoqzZEZBXKGea?dl=0

Have fun :)