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Land Mask data set available? (in lat and lon) [message #29173]

Thu, 07 February 2002 13:38

Robert Stockwell
Messages: 74
Registered: October 2001

Member

Greetings All,
I was just about to assimilate the land mask info
into IDL, but for my purposes I need the land mask
as a function of lat and lon (so as to branch my
algorithm on whether or not a data point falls on land),
rather then merely an image.

Thus I want to have something like
landmask = int(nx,ny)
lon = float(nx,ny)
lat = float(nx,ny)

that I can crunch into an array for my lat, lon sampling
and then directly compare my data with the landmask value.
(a simple water = 0, land = 1 mask is fine for me)

I am interested in the southern hemisphere
(frinstance 40S to 80 south), and 1/2 degree by 1/2 degree
or better.

Does someone have that in IDL?
(or rather, a data format that can be easily digested
into IDL)

Cheers,
bob stockwell

PS

I am about to use the land=sea mask data from:
http://edcdaac.usgs.gov/1KM/land_sea_mask.html
that i found snooping through google. It looks like
I'll have to grab their image which appears to be in
a km by km sampling, and calculate the inverse transform
from their map projection into lat and lon (ugh).

Or perhaps I can use the map commands i IDL and
create an image, grab the image, convert from pixels to
lat and lon.

I am hoping there is an easier way, or at least a
"already done" way

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[Message index]

		Land Mask data set available? (in lat and lon) By: Robert Stockwell on Thu, 07 February 2002 13:38
		Re: Land Mask data set available? (in lat and lon) By: Kelly Dean on Fri, 08 February 2002 11:24
		Re: Land Mask data set available? (in lat and lon) By: wmconnolley on Fri, 08 February 2002 01:43
		Re: Land Mask data set available? (in lat and lon) By: Mark Hadfield on Mon, 11 February 2002 11:54
		Re: Land Mask data set available? (in lat and lon) By: Robert Stockwell on Mon, 11 February 2002 05:20
		Re: Land Mask data set available? (in lat and lon) By: Robert Stockwell on Mon, 11 February 2002 05:08
		Re: Land Mask data set available? (in lat and lon) By: Klaus Scipal on Mon, 11 February 2002 00:22

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