1 FILL_CUBE Resample a cube by random or regular interpolation FILL_CUBE This program resamples an input data cube on a finer grid for the first two dimensions (hence the data cube is treated as an ensemble of images). The output grid may be explicitly determined from the conversion formulae of the two first axis, or implicitly from the number of pixels of the two first axis and the input cube conversion formulae. Two different methods are available for the resampling : The SLOW method, which is general and takes properly into account the input blanking value. This method is based on the same algorithm as the RANDOM command in GreG. It triangulates the input non-blanked values and uses Lagrange polynomials to interpolate on the finer grid. For optimisation purposes, the same triangulation is used for all planes, which assumes that the same pixels are blanked in all planes. If this is not the case, the individual planes should be extracted, and processed separately. The FAST method, which ignores the input blanking value. This method is based on the same algorithm as the RESAMPLE command in GreG. It is faster, but should be used only if no input pixel is blanked. If the data is undersampled, this task is the recommended second step in the data analysis of a cube produced by command ANALYSE\CUBE in CLASS, immediately after the TRANSPOSE program. Task MAKE_CUBE is preferable for oversampled data. 2 Y_NAME\$ TASK\FILE "Input data cube" Y_NAME\$ This is the name of the input data cube. 2 X_NAME\$ TASK\FILE "Output data cube" X_NAME\$ This is the name of the output resampled data cube. 2 PIXELS\$ TASK\INTEGER "Number of pixels" PIXELS\$[2] These are the dimensions of one plane in the resampled output image. They are usually set to 2 or 3 times the dimensions of the input plane. Unpredictable results will be obtained if the output dimensions are smaller than the input dimensions. 2 METHOD\$ TASK\CHARACTER "Resampling method (FAST or SLOW)" METHOD\$ This is the resampling method. FAST method is faster, but only SLOW method allows for blanked pixels. 2 MODE\$ TASK\LOGICAL "Automatic (YES) or manual (NO) mode" MODE\$ Determines whether the conversion formulas for the output plane are specified manually by the user (.FALSE.) or determined automatically (.TRUE.) from the input plane conversion formula and the number of pixels. Automatic mode is usually sufficient, unless you plan to compare the resampled data with an existing data cube. 2 AXIS_1\$ TASK\REAL "First axis conversion formula" AXIS_1\$[3] This is the conversion formula for the first axis of the output plane: reference pixel, value at the reference pixel, and distance between successive pixels. This information is only needed if you have selected the manual mode for the conversion formula. 2 AXIS_2\$ TASK\REAL "Second axis conversion formula" AXIS_2\$[3] This is the conversion formula for the second axis of the output plane: reference pixel, value at the reference pixel, and distance between successive pixels. This information is only needed if you have selected the manual mode for the conversion formula. 2 EXTRAPOLATE\$ TASK\LOGICAL "Extrapolate beyond convex hull?" EXTRAPOLATE\$ In SLOW method, specify wether extrapolation is allowed or not. 1 ENDOFHELP