| Re: trying to find land/water coverage maps for NA [message #71241] |
Thu, 03 June 2010 14:05 |
rogass
Messages: 200
Registered: April 2008
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Senior Member |
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On 3 Jun., 04:08, nata <bernat.puigdomen...@gmail.com> wrote:
> Hi guys,
>
> This week I started working with digital elevation maps (GTOPO30) fromhttp://eros.usgs.gov/#/Find_Data/Products_and_Data_Avail able/gtopo30_....
>
> After reading the files I can draw the topography using the Wikipedia
> topography palette:http://soliton.vm.bytemark.co.uk/pub/cpt-city/wkp/te mplate/tn/wiki-2....
>
> The problem I have right now is that I can't recognise the lakes and
> the rivers because I don't know the land/water coverage.http://eros.usgs.gov/
> provides HYDRO1k data; Compound Topographic Indexs, Slope, Flow
> direction, etc. From these data I can't retrieve the lat/lon pixels
> containing water so I don't know how to go on...
>
> Does anyone know where I can find data for land or water coverage ? I
> just want to draw the topography in a good way. For North America will
> be OK.
>
> Thank you in advance,
> Bernat
You can also use the CIA Worldmap which is included in the ENVI sample
data (as far as i know) and which will help you to separate water
bodies from land surface.
Regards
CR
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| Re: trying to find land/water coverage maps for NA [message #71259 is a reply to message #71241] |
Wed, 02 June 2010 19:59  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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nata writes:
> Does anyone know where I can find data for land or water coverage ? I
> just want to draw the topography in a good way. For North America will
> be OK.
I've always found the GSHHS Shoreline Database to be
excellent for water (and land, for that matter). Although,
I see they have version 2.0.x out now, and they have changed
the header size YET AGAIN!!! It makes it very difficult
to keep up. I've modified my copy at work, but haven't yet
updated my web page versions. If you decide to go this
route, let me know, and I'll move this up a bit in priority.
http://www.dfanning.com/map_tips/gshhs.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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