Depth/height map of the world ? I mean public and free.

XabbaRus · 12-13-07, 06:43 PM

Looks good sid, as long as we have proper navigable seas, ie the Bosphorus and Panama Canal.

Like chock said the NASA stuff is public domain and hi res.

Dr.Sid · 12-13-07, 07:54 PM

Looking looking and can't find it.

Etopo maps are too lowres for Bosphorus or Panama .. but such details could be painted manualy.

Dr.Sid · 12-13-07, 08:08 PM

So I looked into DW. By the map you can see it uses abou 1km detail, which is later interpolated into let's guess 100m polygons.

Then I looked into DW file structure. I looked at the world file. And it has nice header mentioning gtopo30.
gtopo30+Google=http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html

Which means 1km resolution.

I will try to download it tomorrow.

Letum · 12-13-07, 09:45 PM

Try googleing around for DEM maps.

Thats digital elevation data and in comes in *.dem files.

There are millions around, but for high quality ones you will need to pay.
Most are cheep.

If you chose low resolution, perhaps 30m, then your subsim will run faster and you will have more CPU for other features.

Dr.Sid · 12-14-07, 05:52 AM

Ok .. found mentioned shuttle data, just a step from gtopo30. Gtopo30 looks quite OK, but it has no sea-depth. I would have to combine it with etopo, which I don't like at all.

http://eros.usgs.gov/products/elevation.html

Zachstar · 12-17-07, 05:12 AM

For those wondering about this shuttle mission. The one that gave a public domain radar view of most of the earth.

http://en.wikipedia.org/wiki/SRTM
http://en.wikipedia.org/wiki/STS-99
http://srtm.usgs.gov/Mission/missionsummary.php
http://srtm.usgs.gov/Mission/quickfacts.php
http://www2.jpl.nasa.gov/srtm/

There are much higher resoultion missions involving unmanned spacecraft. However those sources are mostly private or military and not around for the general public.

A low resolution combination of SRTM height maps, Landsat data, and other sources (Night lights) can work well for a subsim with light flight aspects. Id say that a really good combination of data ought not to exceed 75-100 MB

Zachstar · 12-17-07, 05:22 AM

A really wonderful source of data is NASA's Blue Marble series. Part of Visual Earth

http://earthobservatory.nasa.gov/Newsroom/BlueMarble/
http://earthobservatory.nasa.gov/New...monthlies.html
http://visibleearth.nasa.gov/
http://visibleearth.nasa.gov/view_se...ategoryID=2363

I love their City Light images.

http://visibleearth.nasa.gov/view_rec.php?id=1438

Fish · 12-17-07, 05:27 AM

We should have a other then DTED 0, as we have now.

http://www.tec.army.mil/fact_sheet/DTED-HRTe.pdf

12-13-07, 06:43 PM	#1
XabbaRus Navy Seal Join Date: Sep 2001 Posts: 5,330 Downloads: 5 Uploads: 0	Looks good sid, as long as we have proper navigable seas, ie the Bosphorus and Panama Canal. Like chock said the NASA stuff is public domain and hi res. __________________

12-13-07, 09:45 PM	#4
Letum Navy Seal Join Date: Feb 2005 Location: York - UK Posts: 6,079 Downloads: 43 Uploads: 0	Try googleing around for DEM maps. Thats digital elevation data and in comes in *.dem files. There are millions around, but for high quality ones you will need to pay. Most are cheep. If you chose low resolution, perhaps 30m, then your subsim will run faster and you will have more CPU for other features. __________________

12-17-07, 05:12 AM	#6
Zachstar Sea Lord Join Date: Feb 2005 Location: Shreveport, Louisiana Posts: 1,956 Downloads: 13 Uploads: 0	For those wondering about this shuttle mission. The one that gave a public domain radar view of most of the earth. http://en.wikipedia.org/wiki/SRTM http://en.wikipedia.org/wiki/STS-99 http://srtm.usgs.gov/Mission/missionsummary.php http://srtm.usgs.gov/Mission/quickfacts.php http://www2.jpl.nasa.gov/srtm/ There are much higher resoultion missions involving unmanned spacecraft. However those sources are mostly private or military and not around for the general public. A low resolution combination of SRTM height maps, Landsat data, and other sources (Night lights) can work well for a subsim with light flight aspects. Id say that a really good combination of data ought not to exceed 75-100 MB __________________

12-17-07, 05:22 AM	#7
Zachstar Sea Lord Join Date: Feb 2005 Location: Shreveport, Louisiana Posts: 1,956 Downloads: 13 Uploads: 0	A really wonderful source of data is NASA's Blue Marble series. Part of Visual Earth http://earthobservatory.nasa.gov/Newsroom/BlueMarble/ http://earthobservatory.nasa.gov/New...monthlies.html http://visibleearth.nasa.gov/ http://visibleearth.nasa.gov/view_se...ategoryID=2363 I love their City Light images. http://visibleearth.nasa.gov/view_rec.php?id=1438 __________________

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12-13-07, 07:54 PM	#2
Dr.Sid The Old Man Join Date: May 2005 Location: Czech Republic Posts: 1,458 Downloads: 6 Uploads: 0	Looking looking and can't find it. Etopo maps are too lowres for Bosphorus or Panama .. but such details could be painted manualy.

12-13-07, 08:08 PM	#3
Dr.Sid The Old Man Join Date: May 2005 Location: Czech Republic Posts: 1,458 Downloads: 6 Uploads: 0	So I looked into DW. By the map you can see it uses abou 1km detail, which is later interpolated into let's guess 100m polygons. Then I looked into DW file structure. I looked at the world file. And it has nice header mentioning gtopo30. gtopo30+Google=http://edc.usgs.gov/products/elevation/gtopo30/gtopo30.html Which means 1km resolution. I will try to download it tomorrow.

12-14-07, 05:52 AM	#5
Dr.Sid The Old Man Join Date: May 2005 Location: Czech Republic Posts: 1,458 Downloads: 6 Uploads: 0	Ok .. found mentioned shuttle data, just a step from gtopo30. Gtopo30 looks quite OK, but it has no sea-depth. I would have to combine it with etopo, which I don't like at all. http://eros.usgs.gov/products/elevation.html

12-17-07, 05:27 AM	#8
Fish Eternal Patrol Join Date: Sep 2001 Location: Netherlands Posts: 1,923 Downloads: 0 Uploads: 0	We should have a other then DTED 0, as we have now. http://www.tec.army.mil/fact_sheet/DTED-HRTe.pdf