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Re: Reproject MODIS automatically using IDL [message #45355]

Tue, 06 September 2005 08:07

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

zamri79@gmail.com wrote:
> I looking at Modis 1B. I want to do a reproject to WGS84 (Malaysia
> Datum).

I don't know anything about "Malaysia Datum". However, the keyword
DATUM=8 causes MAP_PROJ_INIT to use the WGS84 Datum for map
projections. If you're using MAP_SET, it's a little trickier, because
you have to use the ELLIPSOID keyword, and you have to know the actual
numbers that correspond to the WGS84 Datum, and the ELLIPSOID keyword
only affects the Transverse Mercator and Lambert Conic projections. The
following IDL code is supposed to set up suitable contents for a WGS84
ellipsoid, but it hasn't been independently verified:

f = 1-6356752.300000/6378137.000000
eccentricity = 2*f-f2
ellipsoid = [6378137.000000, eccentricity, 0.999600]

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[Message index]

		Re: Reproject MODIS automatically using IDL By: James Kuyper on Tue, 06 September 2005 08:07
		Re: Reproject MODIS automatically using IDL By: peter.albert@gmx.de on Mon, 05 September 2005 22:56
		Re: Reproject MODIS automatically using IDL By: James Kuyper on Mon, 05 September 2005 17:54
		Re: Reproject MODIS automatically using IDL By: zamri79@gmail.com on Mon, 05 September 2005 00:34
		Re: Reproject MODIS automatically using IDL By: zamri79@gmail.com on Sun, 04 September 2005 21:03
		Re: Reproject MODIS automatically using IDL By: George N. White III on Fri, 02 September 2005 14:08
		Re: Reproject MODIS automatically using IDL By: James Kuyper on Fri, 02 September 2005 10:06

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