[R-sig-Geo] Correspondence between gstat and ArcGIS functionality?

[Thomas Juntunen]

On Wed, 14 Apr 2010 15:47:01 -0400, Prof. Jeffrey Cardille wrote:

> For anyone 
> interested, I am trying to repair Landsat satellite photos, which have big 
> broken strips of nodata due to a mechanical failure.  The strips are up to 14 
> pixels wide.  I need to do this 2000x2000 interpolation about 2000 times-- so 
> speed differences of even a few seconds or minutes are quite important..

Hello,

I'm a graduate student at the University of Minnesota in the GIS program. For 
the past couple years I have been assisting a conservation biology doctoral 
student with GIS aspects of her dissertation, which involved acquiring Landsat 
data. I presume you are talking about the scan line corrector problem that 
developed in 2003 on Landsat 7 in the extended thematic mapper?

USGS engineers at EROS have tried several approaches to correcting the gaps, 
primarily by interpolation and filling in from other scenes from the same 
season. I don't have a reference handy, but I did read something that found 
that method had an unreasonable amount of cloud cover interference. However, 
the EROS folks eventually published a paper describing how their "multi-scale 
segmentation" technique worked that was then used for EROS terrain-corrected 
products. If you haven't read it, the paper has lots of valuable information on 
the exact nature of the problem. Here's a link to the citation from the ACM 
portal:

http://portal.acm.org/citation.cfm?id=1393487

For my purposes, the EROS corrected data were sufficient, but some applications 
such as permeability studies may require pixel-level precision.

Good luck with your endeavor and if you find a solution, I hope you'll post 
about it here.


Thomas Juntunen
MGIS Program, University of Minnesota