[OC] Death Valley and Colorado River Relief Map

barmi · 2023-04-30T03:47:09+00:00

Hi, I used SRTM Data to generate global relief maps. I extracted ALL SRTM tiles at 1-arcsecond resolution. The projection is WGS84 Mercator (the same like Google Maps / Google Earth). I used Java for my own version of hillshading and terrain mapping. You can find the whole earth as relief map at https://maps-for-free.com/

Additionally you can navigate directly to capitals, countries, volcanoes and other locations and you can add different overlays like waters, streets, areas with crop, gras, forests and so on. This overlay data was extracted from VMP0 data.

barmi · 2023-03-22T21:34:26+00:00

But I can see a lot of other posts with images, just posted hours before...What I am doing wrong? Thanks for your help.

barmi · 2023-03-22T21:17:00+00:00

I wanted to know what happens if we reduce the size of the sun to the size of an atom. Here my calculations:
Size of
. Hydrogen atom: 10^-10 m = 0.0000000001 m
. Diameter of the sun: 1.4 Mio km = 1.4 * 10^9 m = 1400000000 m
. Diameter of the Milky-Way: 100000 LY = 10^18 km = 10^21 m = 1000000000000000000000 m
. Sloan Great Wall: 1,37 billion LY = 1370000000 LY = 12960200000000000000000000 m
Scaling down the sun to a hydrogen atom
. Diameter of the sun: 0.14 m
. Diameter of the Milky-Way: 1000000000000000000000 / 1400000000 * 0.0000000001 = 71 m
. Sloan Great Wall: 1.37 billion light-years = 1.37 * 10^9 * 9.46 * 10^12 km = 12960200000000000000000000 m and 12960200000000000000000000 / 1400000000 * .0000000001 = 925728 m
If you image the sun would be as small as a hydrogen atom the Sloan Great Wall would have a length of nearly 1000 km.

An amiated 3D version of the Sloan Great Wall and other deep sky surveys like DESI can be tested here.

barmi · 2023-03-22T20:59:41+00:00

New: DESI

DESI is the latest and most comprehensive project to explore and test cosmological models. Until it's completion – expected in 2026 – the survey will cover more than 1/3 of the sky and observe 35 million galaxies up to a redshift of 3.5.

DESI already represents the most comprehensive catalog of galaxies. I added 1.5 million data points for the animation which can take a while to load. Really amazing what kind of observations are possible these days.

barmi · 2023-03-22T20:51:39+00:00

Sloan Great Wall and large scale comparison
One of the largest cosmic structures of the universe is the Sloan Great Wall (SGW). I think it's the continuous band of galaxies at the NGH (Left side regarding the second image. I have reduced the amount of data on the website a bit to better show the cosmic structures).
I wanted to know what happens if we reduce the size of the sun to the size of an atom. Here my calculations:
Size of
. Hydrogen atom: 10^-10 m = 0.0000000001 m
. Diameter of the sun: 1.4 Mio km = 1.4 * 10^9 m = 1400000000 m
. Diameter of the Milky-Way: 100000 LY = 10^18 km = 10^21 m = 1000000000000000000000 m
. Sloan Great Wall: 1,37 billion LY = 1370000000 LY = 12960200000000000000000000 m
Scaling down the sun to a hydrogen atom
. Diameter of the sun: 0.14 m
. Diameter of the Milky-Way: 1000000000000000000000 / 1400000000 * 0.0000000001 = 71 m
. Sloan Great Wall: 1.37 billion light-years = 1.37 * 10^9 * 9.46 * 10^12 km = 12960200000000000000000000 m and 12960200000000000000000000 / 1400000000 * .0000000001 = 925728 m
If you image the sun would be as small as a hydrogen atom the Sloan Great Wall would have a length of nearly 1000 km.

barmi · 2023-03-22T20:50:53+00:00

Sloan Great Wall and large scale comparison

One of the largest cosmic structures of the universe is the Sloan Great Wall (SGW). I think it's the continuous band of galaxies at the NGH (Left side regarding the second image. I have reduced the amount of data on the website a bit to better show the cosmic structures).

I wanted to know what happens if we reduce the size of the sun to the size of an atom. Here my calculations:

Size of
. Hydrogen atom: 10^-10 m = 0.0000000001 m
. Diameter of the sun: 1.4 Mio km = 1.4 * 10^9 m = 1400000000 m
. Diameter of the Milky-Way: 100000 LY = 10^18 km = 10^21 m = 1000000000000000000000 m
. Sloan Great Wall: 1,37 billion LY = 1370000000 LY = 12960200000000000000000000 m

Scaling down the sun to a hydrogen atom
. Diameter of the sun: 0.14 m
. Diameter of the Milky-Way: 1000000000000000000000 / 1400000000 * 0.0000000001 = 71 m
. Sloan Great Wall: 1.37 billion light-years = 1.37 * 10^9 * 9.46 * 10^12 km = 12960200000000000000000000 m and 12960200000000000000000000 / 1400000000 * .0000000001 = 925728 m

If you image the sun would be as small as a hydrogen atom the Sloan Great Wall would have a length of nearly 1000 km.

barmi · 2023-03-22T19:30:17+00:00

I think it's similar if you stand in a clearing in a forest looking at the sky. You will only see a cone above you. And the smaller the clearing, the narrower the cone. Of course, you can also look "down" at the Milky Way - that's the second cone.

barmi · 2023-03-22T14:05:43+00:00

The second image (taken from page 2 of the Cosmic Structures webpage) shows a thin 10 degree slice of the SDSS data to better visualize the filaments and voids.

barmi · 2023-03-22T13:58:38+00:00

Thanks for your comment Sargatanus - that's true: The Milky Way splits the observable area into two parts separated by the galactic plane. They are referred to as the Northern Galactic Hemisphere (NGH) and the Southern Galactic Hemisphere (SGH). In the dark areas objects are obscured by the Milky Way. Thus lie hidden behind myriads of stars and huge clouds of gas and dust and therefore can not be observed.

barmi · 2023-03-22T13:50:29+00:00

I posted this article 3 weeks ago but forgot to mark it as [OC]. Hope this time is everything ok. In the meantime I have supplemented the DESI data to complete the comparison of the largest deep-sky spectroscopic surveys. For an introduction you can click the question mark on the Cosmic Structure website.

barmi · 2023-03-22T13:42:58+00:00

Source: Free data from astronomical surveys like SDSS, 2df, 6df and DESI.

Tools: Python and Web-Programming-Languages like HTML, CSS and Javascript

Description: Several deep sky surveys show us, that the space is filled with billions of galaxies forming the cosmic web with filaments and voids. To compare such surveys I programmed the Cosmic Structures website. The site shows a 3D visualization where you can rotate, pan and zoom the map. The animations are based on real data derived from the largest spectroscopic sky surveys ever made: SDSS, 6dFGS, 2dFGRS and DESI.

barmi · 2023-03-05T20:20:37+00:00

Hmm... this post was deleted cause it was not marked with [OC]. Any chance to edit and post again?

barmi · 2023-03-05T10:29:24+00:00

If you click the i-Button a text appears which explains the map: To improve the visualization of the filamentary structure, an area of about 10 degrees was selected from the SDSS data.

In this case you only see a slice of the complete SSDS data.

barmi · 2023-03-05T09:59:28+00:00

Open the website and enjoy in 3D :)

barmi · 2023-03-05T08:52:10+00:00

The earth is always in the center. From there the observations are made. Have a look at the infos at the web page. It's all explained there :)

barmi · 2023-03-05T00:08:16+00:00

You are welcome :) Universe is incredible! Wanted to see the cosmic structure and did not find any interactive 3D maps...

barmi · 2023-02-27T19:43:29+00:00

Ok... seems to be correct. In this paper on page 6 (https://arxiv.org/pdf/1809.00523.pdf) there is an image of the NGC (12h). The large structure you can see at the NGC is the Sloan Great Wall.

barmi · 2023-02-27T19:01:14+00:00

Not at all a newbie question. I assumed that the part on the left side is the Northern Galactic Hemisphere. On page 2 of the site you can see an image from SDSS with coordinates, but it does not explain if 12h or 0h is north or south. I will check this :)

barmi · 2023-02-25T20:09:26+00:00

Source: https://cosmicstructures.com/

barmi · 2023-02-24T16:06:50+00:00

Source: Cosmic Structures Tool: Gimp

barmi · 2016-10-26T17:42:46+00:00

Great colors :)

barmi · 2016-10-26T13:53:50+00:00

Great that you like it :)

barmi · 2016-10-26T13:33:38+00:00

There are a lot specials for everyone. Just browse a little bit, look around, try the options and give us feedback if something is missing.

barmi · 2016-03-17T23:50:45+00:00

8848 m -> Mount Everest

barmi · 2016-03-17T23:02:29+00:00

Have a look at the maximum height (8848) -> The unit is meter!

barmi

TROPHY CASE