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Re: how can i use envi in batch mode to build mask from EVFs [message #52710 is a reply to message #52706]

Mon, 26 February 2007 08:58

David Streutker
Messages: 34
Registered: June 2005

Member

On Feb 24, 7:59 pm, "stin.wang" <stin.w...@gmail.com> wrote:
> Hello everyone
>
> i use idl/envi to do some statistic works. first i read landsat tm
> into envi, calculate ndvi, and so on .
>
> my question is how can i use envi in batch mode to build mask form
> EVFs. It's certainly well know in ENVI , open a image and EVFs, click
> basic tool-mask-build mask. But every month i need do it again
> according different landsat tm image. It's really boring . I lookup in
> ENVI library routines for such routine. but i find only
> ENVI_MASK_APPLY_DOIT , which apply mask to a image. can anybody help
> me solve this problem?

I've never tried it, but after browsing through the help files, here's
the direction I would take:

1. Open and read the EVF file(s) using the functions ENVI_EVF_OPEN,
ENVI_EVF_READ_RECORD, etc.
2. Convert the geographical coordinates to image coordinates using
ENVI_CONVERT_FILE_COORDINATES.
3. Convert the EVF polygons to ROIs using ENVI_CREATE_ROI and
ENVI_DEFINE_ROI.
4. Create a mask image from the ROIs, possibly using
ENVI_ROI_TO_IMAGE_DOIT.
5. Mask your image using ENVI_MASK_APPLY_DOIT.

Hope that helps, and good luck.

-David

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[Message index]

		Re: how can i use envi in batch mode to build mask from EVFs By: stin.wang on Mon, 26 February 2007 23:19
		Re: how can i use envi in batch mode to build mask from EVFs By: stin.wang on Mon, 26 February 2007 19:39
		Re: how can i use envi in batch mode to build mask from EVFs By: stin.wang on Mon, 26 February 2007 16:56
		Re: how can i use envi in batch mode to build mask from EVFs By: David Streutker on Mon, 26 February 2007 08:58

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