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New NCFileW class to simplify writing netcdf files

interpolate
Michael Uleysky 1 year ago
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fd7d7f8a5f
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3b1d5c3157
2 changed files with 304 additions and 0 deletions
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  1. 201
      include/ncfilew.h
  2. 103
      src/ncfilew.cpp

201
include/ncfilew.h
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#pragma once
#include "MString.h"
#include "traits.h"
#include <algorithm>
#include <netcdf.h>
#include <utility>
#include <vector>
using michlib::MString;
class NCFileW
{
enum Type
{
UNKNOWN,
G1V1,
G1V2,
G2V2
};
struct Var
{
MString name;
int id;
};
static constexpr auto fill = std::numeric_limits<float>::max();
int ncid;
Type type = UNKNOWN;
union
{
struct
{
int xdimid, ydimid;
};
int dimid[2];
};
int xid, yid;
int compress;
std::vector<struct Var> vars;
template<class D> static constexpr Type DetType()
{
if constexpr(ReadIs2DGeoRectArray<D>) return G1V2;
if constexpr(ReadIs2DGeoArray<D>) return G2V2;
if constexpr(ReadIs1DGeoArray<D>) return G1V1;
return UNKNOWN;
};
template<class D> static constexpr bool Is1DType() { return Is1DType(DetType<D>()); }
static constexpr bool Is1DType(Type t) { return t == G1V1; }
MString CreateFile(Type stype, const MString& name, const MString& history, int compression, size_t nx, size_t ny);
public:
static constexpr auto Fill() { return fill; }
~NCFileW() { Close(); }
template<class D> MString Create(const D& data, const MString& name, const MString& history, int compression)
{
if(type != UNKNOWN) return "File already created";
if constexpr(Is1DType<D>())
return CreateFile(DetType<D>(), name, history, compression, data.N(), 0);
else
return CreateFile(DetType<D>(), name, history, compression, data.Nx(), data.Ny());
}
size_t VarId(const MString& name) const
{
for(size_t i = 0; i < vars.size(); i++)
if(vars[i].name == name) return i + 1;
return 0;
}
bool HaveVar(const MString& name) const { return VarId(name) != 0; }
void EndDef() const
{
if(type != UNKNOWN) nc_enddef(ncid);
}
void Close()
{
if(type != UNKNOWN) nc_close(ncid);
type = UNKNOWN;
}
MString AddVariable(const MString& name, const MString& stname, const MString& lname, const MString& units);
template<class D, class Op> MString WriteVariable(const D& data, size_t varid, Op op) const
{
static constexpr auto dtype = DetType<D>();
if(type == UNKNOWN) return "File not open";
if(type != dtype) return "Incompatible data type";
if(varid == 0) return "Incorrect variable";
if constexpr(dtype == UNKNOWN) return "Unknown data type";
size_t v = varid - 1;
EndDef();
int ret;
if constexpr(Is1DType(dtype))
{
const size_t i = 0, c = data.N();
float buf[c];
for(size_t ix = 0; ix < c; ix++) buf[ix] = data.IsFill(ix) ? fill : op(ix);
ret = nc_put_vara_float(ncid, vars[v].id, &i, &c, buf);
if(ret != NC_NOERR) return "Can't write " + vars[v].name + " variable in the netcdf file";
}
else
{
const size_t i[2] = {0, 0};
const size_t c[2] = {data.Nx(), data.Ny()};
float buf[c[0] * c[1]];
for(size_t ix = 0; ix < c[0]; ix++)
for(size_t iy = 0; iy < c[1]; iy++) buf[ix * c[1] + iy] = data.IsFill(ix, iy) ? fill : op(ix, iy);
ret = nc_put_vara_float(ncid, vars[v].id, i, c, buf);
if(ret != NC_NOERR) return "Can't write " + vars[v].name + " variable in the netcdf file";
}
return "";
}
template<class D, class Op> MString WriteVariable(const D& data, const MString& name, Op op) const { return WriteVariable(data, VarId(name), op); }
template<class D> MString WriteVariable(const D& data, size_t varid) const
{
if constexpr(Is1DType(DetType<D>()))
return WriteVariable(data, varid, [&data = std::as_const(data)](size_t i) { return data(i); });
else
return WriteVariable(data, varid, [&data = std::as_const(data)](size_t i, size_t j) { return data(i, j); });
}
template<class D> MString WriteVariable(const D& data, const MString& name) const { return WriteVariable(data, VarId(name)); }
template<class D> MString WriteGrid(const D& data) const
{
static constexpr auto dtype = DetType<D>();
if(type == UNKNOWN) return "File not open";
if(type != dtype) return "Incompatible data type";
EndDef();
int ret;
if constexpr(dtype == G1V1)
{
const size_t i = 0, c = data.N();
float bufx[c];
float bufy[c];
for(size_t ix = 0; ix < c; ix++)
{
bufx[ix] = data.Lon(ix);
bufy[ix] = data.Lat(ix);
}
ret = nc_put_vara_float(ncid, xid, &i, &c, bufx);
if(ret != NC_NOERR) return "Can't write longitude variable in the netcdf file";
ret = nc_put_vara_float(ncid, yid, &i, &c, bufy);
if(ret != NC_NOERR) return "Can't write latitude variable in the netcdf file";
}
else if constexpr(dtype == G1V2)
{
const size_t i = 0, cx = data.Nx(), cy = data.Ny();
float bufx[cx];
float bufy[cy];
for(size_t ix = 0; ix < cx; ix++) bufx[ix] = data.Ix2Lon(ix);
for(size_t iy = 0; iy < cy; iy++) bufy[iy] = data.Iy2Lat(iy);
ret = nc_put_vara_float(ncid, xid, &i, &cx, bufx);
if(ret != NC_NOERR) return "Can't write longitude variable in the netcdf file";
ret = nc_put_vara_float(ncid, yid, &i, &cy, bufy);
if(ret != NC_NOERR) return "Can't write latitude variable in the netcdf file";
}
else if constexpr(dtype == G2V2)
{
const size_t i[2] = {0, 0};
const size_t c[2] = {data.Nx(), data.Ny()};
float bufx[c[0] * c[1]];
float bufy[c[0] * c[1]];
for(size_t ix = 0; ix < c[0]; ix++)
for(size_t iy = 0; iy < c[1]; iy++)
{
bufx[ix * c[1] + iy] = data.Lon(ix, iy);
bufy[ix * c[1] + iy] = data.Lat(ix, iy);
}
ret = nc_put_vara_float(ncid, xid, i, c, bufx);
if(ret != NC_NOERR) return "Can't write longitude variable in the netcdf file";
ret = nc_put_vara_float(ncid, yid, i, c, bufy);
if(ret != NC_NOERR) return "Can't write latitude variable in the netcdf file";
}
else
return "Unknown data type";
return "";
}
};

103
src/ncfilew.cpp
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#define MICHLIB_NOSOURCE
#include "ncfilew.h"
MString NCFileW::CreateFile(NCFileW::Type stype, const MString& name, const MString& history, int compression, size_t nx, size_t ny)
{
if(stype == UNKNOWN) return "Can't determine file type";
compress = compression;
int ret;
MString text;
ret = nc_create(name.Buf(), NC_CLOBBER | NC_NETCDF4, &ncid);
if(ret != NC_NOERR) return "Can't create netcdf file: " + name;
ret = nc_put_att_text(ncid, NC_GLOBAL, "history", history.Len() + 1, history.Buf());
if(ret != NC_NOERR) return "Can't write history attribute in the netcdf file";
switch(stype)
{
case(G1V1):
{
ret = nc_def_dim(ncid, "i", nx, &xdimid);
if(ret != NC_NOERR) return "Can't create dimension in the netcdf file";
ret = nc_def_var(ncid, "longitude", NC_FLOAT, 1, &xdimid, &xid);
if(ret != NC_NOERR) return "Can't create longitude variable in the netcdf file";
ret = nc_def_var(ncid, "latitude", NC_FLOAT, 1, &xdimid, &yid);
if(ret != NC_NOERR) return "Can't create latitude variable in the netcdf file";
break;
}
case(G1V2):
{
ret = nc_def_dim(ncid, "longitude", nx, &xdimid);
if(ret != NC_NOERR) return "Can't create x-dimension in the netcdf file";
ret = nc_def_dim(ncid, "latitude", ny, &ydimid);
if(ret != NC_NOERR) return "Can't create y-dimension in the netcdf file";
ret = nc_def_var(ncid, "longitude", NC_FLOAT, 1, &xdimid, &xid);
if(ret != NC_NOERR) return "Can't create longitude variable in the netcdf file";
ret = nc_def_var(ncid, "latitude", NC_FLOAT, 1, &ydimid, &yid);
if(ret != NC_NOERR) return "Can't create latitude variable in the netcdf file";
break;
}
case(G2V2):
{
ret = nc_def_dim(ncid, "longitude", nx, &xdimid);
if(ret != NC_NOERR) return "Can't create x-dimension in the netcdf file";
ret = nc_def_dim(ncid, "latitude", ny, &ydimid);
if(ret != NC_NOERR) return "Can't create y-dimension in the netcdf file";
ret = nc_def_var(ncid, "longitude", NC_FLOAT, 2, dimid, &xid);
if(ret != NC_NOERR) return "Can't create longitude variable in the netcdf file";
ret = nc_def_var(ncid, "latitude", NC_FLOAT, 2, dimid, &yid);
if(ret != NC_NOERR) return "Can't create latitude variable in the netcdf file";
break;
}
case(UNKNOWN): return "Can't determine file type";
}
ret = nc_def_var_deflate(ncid, xid, 1, 1, compress);
if(ret != NC_NOERR) return "Can't set deflate parameters for longitude variable in the netcdf file";
ret = nc_def_var_deflate(ncid, yid, 1, 1, compress);
if(ret != NC_NOERR) return "Can't set deflate parameters for latitude variable in the netcdf file";
text = "longitude";
ret = nc_put_att_text(ncid, xid, "standard_name", text.Len() + 1, text.Buf());
if(ret != NC_NOERR) return "Can't write standard_name attribute of longitude variable in the netcdf file";
text = "latitude";
ret = nc_put_att_text(ncid, yid, "standard_name", text.Len() + 1, text.Buf());
if(ret != NC_NOERR) return "Can't write standard_name attribute of latitude variable in the netcdf file";
type = stype;
return "";
}
MString NCFileW::AddVariable(const MString& name, const MString& stname, const MString& lname, const MString& units)
{
if(type == UNKNOWN) return "File not opened";
if(HaveVar(name)) return "Variable " + name + " already defined";
struct Var v(name, 0);
int ret;
if(type == G1V1)
ret = nc_def_var(ncid, v.name.Buf(), NC_FLOAT, 1, &xdimid, &v.id);
else
ret = nc_def_var(ncid, v.name.Buf(), NC_FLOAT, 2, dimid, &v.id);
if(ret != NC_NOERR) return "Can't create " + v.name + " variable in the netcdf file";
ret = nc_def_var_deflate(ncid, v.id, 1, 1, compress);
if(ret != NC_NOERR) return "Can't set deflate parameters for " + v.name + " variable in the netcdf file";
if(stname.Exist()) ret = nc_put_att_text(ncid, v.id, "standard_name", stname.Len() + 1, stname.Buf());
if(ret != NC_NOERR) return "Can't write standard_name attribute of " + v.name + " variable in the netcdf file";
if(lname.Exist()) ret = nc_put_att_text(ncid, v.id, "long_name", lname.Len() + 1, lname.Buf());
if(ret != NC_NOERR) return "Can't write long_name attribute of " + v.name + " variable in the netcdf file";
if(units.Exist()) ret = nc_put_att_text(ncid, v.id, "units", units.Len() + 1, units.Buf());
if(ret != NC_NOERR) return "Can't write units attribute of " + v.name + " variable in the netcdf file";
ret = nc_put_att_float(ncid, v.id, "_FillValue", NC_FLOAT, 1, &fill);
if(ret != NC_NOERR) return "Can't write _FillValue attribute of " + v.name + " variable in the netcdf file";
vars.push_back(v);
return "";
}
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