ASIS:Data geo

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DATA: Geothermal heat flux

METHOD: Satellite magnetic data

ORIGINAL DATA:

ASIS FORMAT DATA:

ASCII FILE:

SOURCE: Cathrine Maule

REF: Maule, C., M. Purucker, N. Olsen, and K. Mosegaard (2005), Heat flux anomalies in Antarctica revealed by satellite magnetic data, Science, 309, 464–467.

DATE ACQUIRED: 22/07/08

CONDITIONS: Permission for general use in this project.

UNITS: mW m-2

ORIGINAL FORMAT: lat-long point locations

ORIGINAL RESOLUTION: effective ~180 km

ORIGINAL PROJECTION: Geographic

PROCESSING: Data reprojected to polar stereographic. Ordinary kriging was used to interpolate the values on to a 5 km grid. The grid was then masked using a 60 km buffer around the coastline dataset.

COMMENTS: The kriging method used to produce this gridded dataset provides a much smoothed distribution, compared to the figure provided in Maule et al., 2005, implying that more data exists than really does. The resulting distribution is highly dependent on the interpolation method employed. I've also included a dataset using IDW interpolation (using a high power), which gives a distribution more similar to the geographic projection used by Maule et al. 2005

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Original figure:



Interpolated dataset using Kriging interpolation (original point data overlain):



Interpolated dataset using IDW interpolation: