IPDS.DAT:Interpolation examples

Interpolation with one position (constant values for a region)

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Explanation Pictured above is the water level distribution according to the specifications of an ipds file as per margin. The default value is set to 1.0 m except for the whole region Schiermonnikoog. For this region the position Schiermonnikoog sets the water level to 5.0 m. No interpolation is needed.

Extract of the ipds file BEGINDATA global_constant_values waterlevel = 1.00 ENDDATA global_constant_values BEGINDATA region region_name = Schiermonnikoog border_point = 2508043.61 5924802.02 border_point = 2507900.39 5925033.17 border_point = .. .. ENDDATA region BEGINDATA sampling_point sampling_point_name = Schiermonnikoog sampling_point_xy = 2510430.00 5927000.00 waterlevel = 5.00 ENDDATA sampling_point BEGINDATA regional_values region = inside Schiermonnikoog sampling_point = Schiermonnikoog interpolation_method = nearest_points_in_sectors ENDDATA regional_values

Interpolation with four positions

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Explanation Pictured above is the distribution of the sediment fraction clay according to the specifications of an ipds file as per margin. The default value is set to 0.2 (this means 20 percent) except for the region Borkum. For this region the four positions BorkumWest, BorkumEast, BorkumNorth and BorkumSouth overwrite the default value. The values between the four positions are interpolated.Please note that the position BorkumNorth makes no specification for the sediment fraction clay, because clay doesn't occur at this position.

Extract of the ipds file BEGINDATA global_constant_values sediment_fraction = clay 0.2 sediment_fraction = .. ENDDATA global_constant_values BEGINDATA region region_name = Borkum border_point = 2548348.47 5937586.32 border_point = 2547835.30 5937224.83 border_point = .. .. ENDDATA region BEGINDATA sampling_point sampling_point_name = BorkumWest sampling_point_xy = 2545000.00 5939167.12 sediment_fraction = clay 0.3 sediment_fraction = .. ENDDATA sampling_point BEGINDATA sampling_point sampling_point_name = BorkumEast sampling_point_xy = 2554000.00 5941457.07 sediment_fraction = clay 0.3 sediment_fraction = .. ENDDATA sampling_point BEGINDATA sampling_point sampling_point_name = BorkumNorth sampling_point_xy = 2550477.26 5943500.00 sediment_fraction = .. ENDDATA sampling_point BEGINDATA sampling_point sampling_point_name = BorkumSouth sampling_point_xy = 2547835.30 5937300.00 sediment_fraction = clay 0.5 sediment_fraction = .. ENDDATA sampling_point BEGINDATA regional_values region = inside Borkum sampling_point = BorkumWest sampling_point = BorkumEast sampling_point = BorkumNorth sampling_point = BorkumSouth interpolation_method = nearest_points_in_sectors ENDDATA regional_values

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