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Re: How to read ASTER in ENVI? [message #55549 is a reply to message #55543]

Mon, 27 August 2007 04:37

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

highstone schrieb:
> hello, I have a secen ASTER data named as "pg-
> PR1B0000-2003102104_030_001"锟斤拷which not have suffix ".hdf ", and no
> other files that have the same filename with suffix such as ".met",
> and so on. When I read it by ENVI from "file----open image file" or
> "file ----open external file---eos---aster", all the bands can be
> showed in "available bands", and the DN of VIR band is float type and
> more than 1, which shows it is not reflectance. I want to know how to
> get the reflectance for visible or infrared bands and the radiance for
> Tir of such ASTER data in ENVI or ERDAS? please help me, thank you.
>

From the filename, I believe that you are looking at an ASTER image from
2003 processed to Level 1B: registered radiance at the sensor. See

http://lpdaac.usgs.gov/aster/ast_l1b.asp

That meaans that the float data are in units of
watts/meter^2/steradian/micrometer

In order to get ground reflectance you would either have to apply
atmospheric correction yourself (e.g. with ENVI's FLAASH Addon) or order
the corresponding product from LPDAAC.

-Mort

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[Message index]

		Re: How to read ASTER in ENVI? By: James Kuyper on Mon, 27 August 2007 07:51
		Re: How to read ASTER in ENVI? By: Jeff N. on Mon, 27 August 2007 07:25
		Re: How to read ASTER in ENVI? By: Mort Canty on Mon, 27 August 2007 04:37

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