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| In particular, it can be applied for interpolation on a spatially highly resolved regular grid that, on the one side, does not destroy the fine structures in the spatial distributions calculated with CLaMS and, on the other side, makes easier the handling of the CLaMS output (e.g. plotting). | In particular, it can be applied for interpolation on a spatially highly resolved regular grid that, on the one side, does not destroy the fine structures in the spatial distributions calculated with CLaMS and, on the other side, makes easier the handling of the CLaMS output (e.g. plotting). <<BR>> The program ''i3d_reg.f90'' can be used for interpolation of the CLaMS output (init-file on irregurlar grid) on a regular grid (e.g. ECMWF data). |
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| === How to get the source code === | === Available programs === |
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| The source code of this package is under control of the CVS (Concurrent Version System) utility. To get the source code the environment variable CVSROOT must be set to ''/usr/local/icg/icg1/archive''. The command {{{ cvs co -P i3d }}} creates a directory ''i3d'' in the current working directory and copies the current version of the i3d package to this directory. |
* [[/i3d | i3d]]: interpolation from irregular grid to a different irregular grid * [[/i3dreg | i3d_reg]]: interpolation from irregular grid to a regular grid |
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| The directory ''i3d'' includes the following subdirectories: * ''doc'': latex file for documentation * ''mod'': module files * ''obj'': object files * ''source'': source code * ''templates'': templates for configuration file === Compiling === The program can be compiled on different platforms with the makefile stored in the directory ''i3d'': {{{ gmake i3d }}} The program will be compiled for the used platform and an executable ''i3d'' will be created. === Configuration file === The options for the execution of ''i3d'' are set in the configuration file '''i3d.inp''': {{{ 1) y ! north_hemisphere (y/n) 2) 30., 90. ! lat_min, lat_max 3) 3 ! 0=nearest, 1=weighted, 2=both, 3=weighted_new 4) 2 ! number of tags CH4 O3 5) n ! use one init-file 6) /private/CNx_ECN_3d_24_1.5 ! input directory (init-files) CNx ! prefix of init-files (3 character) 7) data/mipas_isen_noonpos_030103_030131.nc ! input file (aircraft/satellite data) 8) outdir ! output directory 9) testout ! output prefix 10) y ! write warnings (y/n) }}} {{{ 1) y ! north_hemisphere (y/n) 2) 30., 90. ! lat_min, lat_max 3) 3 ! 0=nearest, 1=weighted, 2=both, 3=weighted_new 4) 2 ! number of tags CH4 O3 5) y ! use one init-file 6) test1/init_BN0_02100112.nc ! init-file 7) test1/pos_A_0_01100112.nc ! input file (aircraft/satellite data) 8) test1 ! output directory 9) testout ! output prefix 10) n ! write warnings (y/n) }}} Remarks: 1. Start triangle for the walking triangle algorithm: y/n -- north/south hemisphere (does not work. Now, the $n/2$ ($n-$number of all triangles) is chosen as a start triangle). 1. Latitude range of the (external) grid where interpolations have to be determined. 1. [[I3dInterpolationType | Interpolation type]] 1. Number of species to add to input file (line 7) and their names. If Variable ''TRACER'' should be added to input file, it should be specified at the end of the list.<<BR>> If the number of species is "0", all species from CLaMS file (line 6) listed on Variable ''SPECIES'' and Variable ''TRACER'' are added to input file. 1. use one CLaMS file for all dates in input file (y/n) 1. [[I3dClamsInputFiles | CLaMS input files]]:<<BR>> line5='y': Name of CLaMS file <<BR>> line5='n': directory with CLaMS output and prefix of these files 1. [[I3dInputFiles | Input file with the external grid]] 1. Output directory 1. Name of the [[I3dOutputFile | NetCDF output file]] 1. Write warnings if triangle is not found === The walking triangle algorithm === The walking triangle algorithm is described in [1]. It describes how in 2D (and 3D) a Delaunay triangle can be found that contains a given point ''X''. The walking triangle uses the following criterion to find such a triangle: ''X'' is inside of a triangle ''ABC'' if the given point ''X'' and the triangle point that does not define the considered triangle side are on the same side of the considered triangle side for each of the 3 possible sides of the triangle. E.g. for the side ''AB'', the following relation has to be valid: $[{\bf n}\cdot({\bf c}-{\bf a})][{\bf n}\cdot({\bf x}-{\bf a})] > 0$ with ${\bf n}={\bf a}\times {\bf b}$. This means that ''X'' and ''C'' are on the same side of ''AB'' if both scalar products have the same sign. The walking triangle algorithm checks if ''X'' is inside of the the start triangle by applying criterion for each triangle side. If for one triangle side this criterion is not valid, one has to walk to the corresponding neighboring triangle. In this way one walks in this triangle world directly to the triangle containing ''X''. === References === [1] M. Sambridge, J. Braun, and H. !McQueen. Geophysical parameterization and interpolation of irregular data using natural neighbors. ''Geophys. J. Int.'', 122:837--857, 1995. |
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| [[ I3dChanges | History of Changes ]] | [[ /Changes | History of Changes ]] |
The package i3d
The program i3d.f90 can be used for interpolation of the CLaMS output (usually stored on irregular grid in init*.nc) on an arbitrary different irregular grid (e.g. experimental data). In particular, it can be applied for interpolation on a spatially highly resolved regular grid that, on the one side, does not destroy the fine structures in the spatial distributions calculated with CLaMS and, on the other side, makes easier the handling of the CLaMS output (e.g. plotting).
The program i3d_reg.f90 can be used for interpolation of the CLaMS output (init-file on irregurlar grid) on a regular grid (e.g. ECMWF data).
Available programs
i3d: interpolation from irregular grid to a different irregular grid
i3d_reg: interpolation from irregular grid to a regular grid