This USGS topographical map was, I believe, last posted by Barnstormer66 HERE on the old GEC. This map is described as under "Mature Support" because it is no longer being updated, but I have found it to be an extremely useful tool. I have experienced few of the problems that he described, perhaps because I have a fast system and a very fast internet connection.
The only delay I have experienced is that one must zoom out until a map image appears, and then zoom in through the successive layers of resolution until the highest degree of resolution (or the degree you wish to use) appears. When moving to adjoining map segment, one usually needs to zoom out a bit, and then zoom back in.
I didn't find a download for it on a government site, but a direct download is the first thing that appears in a Google search. I am attaching that file.
There is another excellent resource I use which does not give a seamless topo like the NGS. Google Earth Library has a free download directly to Google Earth which overlays individual topo maps with all border information. I have used it many times to help to decode what I see in views of the US.
The lower border for a topo of the map of the center of the GE globe
Google Earth Library also has other useful free products and paid products.
And one more. I'm adding it last because it is slowest of all and at times the server does not respond. But it does have a small collection of gadgets: Modis Rapid Response System (my favorite), USGS Ortho 1 Meter (it used to be more useful, but for the most part GE has surpassed it) , USGS Topo Maps, and US Navy Cloud Top (pretty good world wide clouds and up to date). The original ooGEC thread is HERE.
You may want to put all of these in one folder as I have on my computer.
KitsuneFox: syzygy - posts I have made here do not receive much attention. I may do a detailed writeup of the now lost Edgemont Park in PA, one of the first electrified trolley parks in the world, but still debating. I'm missing 1 key bit of information.
Aug 17, 2021 10:38:20 GMT
syzygy: BRUTAL! Cars as if were matchboxes in a model town... Brilliant infos you share here in shoutbox - why not you post these?
Aug 16, 2021 17:36:00 GMT
KitsuneFox: In the early morning, before sunrise, of Augusts 11th, 12th, and 13th is reported to be the best viewing time for the Perseids meteor shower.
Aug 10, 2021 10:32:11 GMT
KitsuneFox: Davidson Seamount is the tallest known fully underwater mountain in the world, measuring 7,480 feet base to peak.
Aug 5, 2021 0:02:27 GMT
syzygy: ...and about other hills and humps... stone cold wisdom! ( :
Jul 28, 2021 14:13:17 GMT
KitsuneFox: Mount Wycheproof in Australia is the shortest recognized mountain on the world. It stands at 141 feet base to peak. A mineral named 'Wycheproofite' is mined near the location, and is the only known place it's found.
Jul 28, 2021 10:13:47 GMT
syzygy: Cool! Great extra info series about "all stars" highest mountains on Earth!
Jul 22, 2021 6:25:22 GMT
KitsuneFox: Mount Chimborazo in Ecuador is the highest mountain on Earth, as measured from the center of the planet. The peak is over 6,800 feet further away than Mount Everest, and is the closest land on earth to outer space.
Jul 22, 2021 0:13:35 GMT