Welcome Guest [Log In] [Register]

This board is closed and will be kept as an archive. Please head to our new home at tch-forum.com



(Existing members: Please check your PMs for your password on the new board. If you do not have a PM, then please send one to me)



Welcome to The Coffee House - your dose of caffeine!

The Coffee House is a friendly and informal community dedicated to having fun. We're a diverse bunch, and so we have plenty to offer, including:
  • Discussions on a wide range of subjects, from science and current events to sport and gaming (and most things in between!);
  • Community-centered forums where members can get to know each other better, and share things they've made;
  • Regularly-scheduled contests, where members can compete for awards and forum currency (Coffee Credits);
  • Shops, where members may spend the Coffee Credits they've earned;
  • A Discord server, where anyone can chat to our members in real time.
What you can see below is a snapshot of what we have to offer. To see the rest, and gain access to all of this, all you need to do is register as a member. Registration is quick, free and easy.

Join our community!

If you're already a member please log in to your account to access all of our features:

Username:   Password:
Add Reply
Landsat images
Topic Started: Jan 14 2011, 05:34 PM (491 Views)
Michelle
No Avatar
.

This is weird: it appears to be radar-generated :huh:
Posted Image

Here's the description:
Portland, the largest city in Oregon, is located on the Columbia River at the northern end of the Willamette Valley. On clear days, Mount Hood highlights the Cascade Mountains backdrop to the east. The Columbia is the largest river in the American Northwest and is navigable up to and well beyond Portland. It is also the only river to fully cross the Cascade Range, and has carved the Columbia River Gorge, which is seen in the left-central part of this view. A series of dams along the river, at topographically favorable sites, provide substantial hydroelectric power to the region.

This perspective view was generated using topographic data from the Shuttle Radar Topography Mission (SRTM), a Landsat satellite image, and a false sky. Topographic expression is vertically exaggerated two times.

Landsat has been providing visible and infrared views of the Earth since 1972. SRTM elevation data substantially help in analyzing Landsat images by revealing the third dimension of Earth’s surface, topographic height. The Landsat archive is managed by the U.S. Geological Survey’s EROS Data Center (USGS EDC).

Size: View width 88 kilometers (49 miles), View distance 106 kilometers (66 miles) Location: 45.5 degrees North latitude, 122.5 degrees West longitude Orientation: View East-Southeast, 10 degrees below horizontal, 2 times vertical exaggeration Image Data: Landsat Bands 3, 2, 1 as red, green, blue, respectively Date Acquired: February 2000 (SRTM), August 10, 1992 (Landsat)


Here's another nice one - island of Ekarma:
Posted Image
Edited by Michelle, Jan 14 2011, 05:36 PM.
Offline Profile Quote Post Goto Top
 
CJ
Member Avatar
A very minor case of serious brain damage

This is all very interesting, but what are the advantages of doing it like this when you can just take photos?
Offline Profile Quote Post Goto Top
 
Michelle
No Avatar
.

Because it's more fascinating.
Offline Profile Quote Post Goto Top
 
CJ
Member Avatar
A very minor case of serious brain damage

I guess so. What I'm asking, though, is whether radar-generated is more useful in any way?
Offline Profile Quote Post Goto Top
 
Michelle
No Avatar
.

I think radar actually finds things that photographs can't.
Offline Profile Quote Post Goto Top
 
CJ
Member Avatar
A very minor case of serious brain damage

Here's an image by Landsat 7, which shows Adam's Bridge, between India and Sri Lanka:

Posted Image

It's believed that it was entirely above land until it was destroyed by a typhoon in around 1480 - so it used to be possible to walk from India to Sri Lanka.
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Earth and Space · Next Topic »
Add Reply


Anti-Spam Bots! Mazeguy Smilies