Author Topic: Greenland without ice cap  (Read 236 times)

Offline cyphyr

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Greenland without ice cap
« on: November 11, 2017, 08:48:31 AM »
I saw some geological maps recently showing the bedrock of greenland without the ice cap. Always wondered what it would look like naked as it were :)
Although I could not find any height maps showing just the rock elevation of just Greenland I was able to find a global one.
Added a little roughness on the coastline and some extra mountains and voila :)

Link to global heightmap
https://www.ngdc.noaa.gov/mgg/global/relief/ETOPO1/data/bedrock/grid_registered/georeferenced_tiff/

www.richardfraser.co.uk
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Offline Oshyan

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Re: Greenland without ice cap
« Reply #1 on: November 11, 2017, 08:39:11 PM »
Cool idea and definitely interesting to see it this way.

- Oshyan

Offline gao_jian11

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Re: Greenland without ice cap
« Reply #2 on: November 12, 2017, 01:10:10 AM »
How to use this texture maps, please?

Offline Dune

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Re: Greenland without ice cap
« Reply #3 on: November 12, 2017, 06:04:20 AM »
Cool Richard. Interesting to see the center has such huge depressions, probably caused by the weight of the ice. Really  looks like it. I guess if it all melts, it'll rise (but how much?).
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Offline cyphyr

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Re: Greenland without ice cap
« Reply #4 on: November 12, 2017, 08:33:27 AM »
How to use this texture maps, please?
The Heightmap is in the link and is simply spherically mapped through an image map shader. Because it's a Geotiff it displaces both positively and negatively so sea level stays at 0m. I displaced this by 198000 I think.

Cool Richard. Interesting to see the center has such huge depressions, probably caused by the weight of the ice. Really  looks like it. I guess if it all melts, it'll rise (but how much?).
Quite possibly. The lowest part of the depression is about -190m and the ice coverage reaches a max of around 3km so that's a hell of a lot of weight. Glacial Hydrostatic Rebound is the subject and it is being studied in Greenland presently. No real answers as yet. I remember from the Drain the Great Lakes project that the weight of ice over Canada was enough for the rivers to flow the opposite direction than they do now.
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Offline N-drju

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Re: Greenland without ice cap
« Reply #5 on: November 12, 2017, 11:34:23 AM »
Beautiful, clean render. Congratulations cyphyr.
"I don't know what 'pokygon' is but I like it."

Offline Stormlord

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Re: Greenland without ice cap
« Reply #6 on: November 12, 2017, 08:03:33 PM »
Yes, good clean rendering. Interesting what we can do with these maps, well done.

STORMLORD

Offline sboerner

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Re: Greenland without ice cap
« Reply #7 on: November 13, 2017, 12:50:02 AM »
Brilliant work, nice rendering. Has an impressive panoramic feel to it. The kind of data that's publicly available now is pretty amazing.

Does the data include Antarctica? Might be worthy of the same treatment.

Offline cyphyr

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Re: Greenland without ice cap
« Reply #8 on: November 13, 2017, 07:59:47 AM »
I am looking for some high resolution Antartica height data. A similar situation with hidden islands, valleys and river systems. IIRC the Antartica data I last saw was quite patchy but it may have been worked on further by now.
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Offline mhaze

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Re: Greenland without ice cap
« Reply #9 on: November 13, 2017, 09:25:12 AM »
Great idea, well executed.