Dear all,

We are going to interpolate biophysical variables into continuous surface data using point samples in Australian EEZ that covers an area of 10 utm zones and ca. 44 degrees in terms of latitude. Our data is in lat and long (i.e., WGS84). We intend to apply kriging methods to such a big area. Of course, we can divide the whole EEZ into some subregions and actually we are going to divide it into some subregions based on a number of factors, but these sub-regions are still quite large and can cover 2 to 3 utms and 7-15 degrees in terms of latitude. Obviously it is not quite appropriate to treat a spherical surface as a plane. Given that kriging can not handle a spherical surface (hope this assumption is still valid), perhaps an alternative is project such spherical surface on to a plane. We have tried some equal distance projections to convert our data for Australian EEZ, but it seems that none of them can produce satisfactory projections, although sinusoidal gave slightly better results in comparison with utm projection. Any suggestions? Thanks in advance.

Cheers,

Jin
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Jin Li, PhD
Spatial Modeller/Computational Statistician
Marine & Coastal Environment
Geoscience Australia
GPO Box 378, Canberra, ACT 2601, Australia

Ph: 61 (02) 6249 9899; email: jin.li@ga.gov.au<mailto:jin.li@ga.gov.au>
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