Re: AI-GEOSTATS: Variogram range physical meaning !
- the meaning of these is the continuity of the "reflactanse" or colour value
measured in each pixel, it seem to be low continuity, the size of the range
is proportional to the spatial continuity. More useful than it can be the
use that you can do to dose variograms. it is possible to filter the image
friging the drift or use the image as drift or secondary variable for
estimate the spatial behevieur of correlate variable (type of soil for
example o rate of clay or iron in clay and iron ratio obtained with Land Sat
Images, in these case the primary variables should be clay, iron and soil
type in field). Some simulations techniques can be used to.
Adrian Martinez Vargas
Departamento de Geología
ISMM, Las Coloradas, s/n
Moa Holguín Cuba
----- Original Message -----
From: "Serele, Charles" <Charles.Serele@...>
To: "Geostat list (E-mail)" <ai-geostats@...>
Sent: Friday, June 06, 2003 12:06 PM
Subject: AI-GEOSTATS: Variogram range physical meaning !
> Hi All,
> I got some results from a variogram analysis on two remote sensing images
> with pixel size of 8m and 30m each. I would like to know the physical
> meaning of the variogram range over a forest target. The range varies from
> pixels (40m) to 10 pixels (80m) for the 8m pixel size image (CASI), and
> 3 pixels (90m) to 15 pixels (450m) for the 30 m pixel size image
> from visible to near-infrared bands.
> 1. What these distances represents at the ground level ? They are to high
> be associated to the tree size. How can I interpret this ?
> 2. For the variogram I computed from a mineral target, the range increases
> continuously as a function of wavelengths, what's that mean ?
> Thanks a lot for your time
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