1933RE: [ai-geostats] Kriging along streams
- Feb 24, 2005Dear Oscar,
It sounds like you need kriging in a single dimension. If so, I think what
you need to do is a kind of coordinate transformation, for example using
river mile as your distance vector. You would also need to pay attention to
the dates of the samples. Variation in time might obscure spatial trends
along the river's course if you just have a few sampling events at different
times for the stations.
If you have data in space as well as time, there are several methods for
space-time interpolation. Constructing correlograms for data vs time on
paired stations could give you an idea of what constitutes a data pair for
kriging purposes in terms of the time lag between them. Methods will differ
depending on whether it is the time or space dimension that is more densely
References on techniques include the following:
For straightening rivers (which might be more involved than you need):
Barabas, N., Goovaerts, P. and P. Adriaens. 2001. Geostatistical assessment
and validation of uncertainty for three-dimensional dioxin data from
sediments in an estuarine river. Environmental Science & Technology, 35(16):
For space-time data:
Pebesma and de Kwaadsteniet (1997) Mapping spatial and temporal variation of
groundwater quality in the Netherlands. In GeoENVI - Geostatistics for
Environmental Applications, eds., Soares et al, pp. 139-151. Kluwer
Academic Publishers, Netherlands.
Kyriakidis and Journel (1999) Geostatistical space-time models: A review.
Mathematical Geology (not sure which volume etc.)
Heuvelink et al (1996) Spatio-temporal kriging of soil water content. In
Geostatistics Wollongong '96, eds Baafi and Schofield. pp. 1020-1030.
Kluwer Academic Publishers,Netherlands.
From: oscar garcia [mailto:osgarcia@...]
Sent: Thursday, February 24, 2005 11:56 AM
Subject: [ai-geostats] Kriging along streams
Dear list members,
I want to perform kriging of water quality indicators
measured in stations along a river course, so Can you
help me with references about kriging along streams in
a river basin?? is there software to perform this kind
Thanks in advance for your help,
Oscar Javier García-Cabrejo
Master in Hydrosystems, Civil Engineering Department
Pontificia Universidad Javeriana
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