Seven methods of spatial interpolation were compared to determine their suitability for estimating daily mean wind speed surfaces, from data recorded at nearly 190 locations across England and Wales. The eventual purpose of producing such surfaces is to help estimate the daily spread of pathogens causing crop diseases as they move across regions. The interpolation techniques included four deterministic and three geostatistical methods. Quantitative assessment of the continuous surfaces showed that there was a large difference between the accuracy of the seven interpolation methods and that the geostatistical methods were superior to deterministic methods. Further analyses, testing the reliability of the results, showed that measurement accuracy, density, distribution and spatial variability had a substantial influence on the accuracy of the interpolation methods. Independent wind speed data from ten other dates were used to confirm the robustness of the best interpolation methods. Crown
As a result of recent road improvements, two examples of a hitherto unknown type of iron-working furnace have been found in Northamptonshire. These are at Laxton Lodge (SP068971) and Byfield (SP505515), at different ends of the county (FIG. I). Most Romano-British furnaces belong to the shaft type which has a maximum diameter of 0–5 m. The more recently found furnaces are between 1–1.4 m in internal diameter which means that the method of working them must have been quite different from the smaller shaft furnaces.
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