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read.jl
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read.jl
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"""
readbin(fname::String,prec::Type,iosize::Tuple,fldidx=1)
Read in a binary file to an Array.
"""
function readbin(fname::String,prec::Type,iosize::Tuple,fldidx=1)
n3 = 1
if length(iosize) == 3
n1,n2,n3 = iosize
else
n1,n2 = iosize
end
if prec == Float64
reclen = 8
else
reclen = 4
end
field = Array{prec,1}(undef,(n1*n2*n3))
fid = open(fname)
if fldidx != 1
seek(fid,n1*n2*n3*(fldidx-1)*reclen)
end
read!(fid,field)
close(fid)
field = hton.(field)
n3>1 ? s=(n1,n2,n3) : s=(n1,n2)
return reshape(field,s)
end
"""
readbin(flddata::BinData,tidx=1)
Read in a binary file as an array as specified by BinData
"""
readbin(flddata::BinData,tidx=1) = readbin(flddata.fnames[tidx],flddata.precision,flddata.iosize,flddata.fldidx)
"""
readncdata(var::NCData,i::Union{Colon,Integer}=:)
Read netcdf file as specified in `NCData` argument. Optional
argument `i` can be used to read a specific records / times.
"""
function readncdata(var::NCData,i::Union{Colon,Integer}=:)
if var.backend == NCDatasets
ds = Dataset(var.fname)
ncfilvar = ds[var.varname]
else
ncfilvar = NetCDF.open(var.fname,var.varname)
end
numdims = ndims(ncfilvar)
if numdims == 1
values = ncfilvar[i]
elseif numdims == 2
values = ncfilvar[:,i]
elseif numdims == 3
values = ncfilvar[:,:,i]
elseif numdims == 4
values = ncfilvar[:,:,:,i]
else
println("Variables greater than four dimensions not currently supported")
end
if var.backend == NCDatasets
close(ds)
else
if pkg_version("NetCDF") < v"0.10"
NetCDF.close(var.fname)
else
finalize(var.fname)
end
end
return values
end
"""
readdata(flddata,tidx=1)
Generic wrapper function to read data from a file regardless of file/data type.
"""
function readdata(flddata,tidx=1)
if isa(flddata,BinData)
res = readbin(flddata,tidx)
elseif isa(flddata,NCData)
res = readncdata(flddata,tidx)
elseif isa(flddata,TileData)
if isa(flddata.vals,BinData)
iosize = flddata.vals.iosize
grid = flddata.tileinfo["XC"].grid
if length(iosize) == 3
f = Array{Array{flddata.vals.precision,2},2}(undef,grid.nFaces,iosize[3])
exarray = MeshArray(grid,f)
else
exarray = flddata.tileinfo["XC"]
end
res = read(readbin(flddata.vals,tidx),exarray)
else
if isa(flddata.vals,MeshArray) || isa(flddata.vals,MeshArrays.gcmfaces)
res = flddata.vals
else
res = flddata.vals[tidx]
end
end
end
return res
end
"""
readncfile(fname,backend::Module=NCDatasets)
Read in a NetCDF file and return variables/dimensions as `NCvar` structs, and
file attributes as `Dict`. Large variables/dimensions are not loaded into
memory. This can use either `NCDatasets.jl` or `NetCDF.jl`
"""
function readncfile(fname,backend::Module=NCDatasets)
if backend==NetCDF
vars,dims,fileatts = readncfile_NetCDF(fname)
else
ds = Dataset(fname)
dims = Dict{String,NCvar}()
vars = Dict{String,NCvar}()
for k in keys(ds)
if ~haskey(dims,k)
k_units = get(ds[k].attrib,"units","")
k_atts = Dict(ds[k].attrib)
if length(dimnames(ds[k])) == 1 && k == dimnames(ds[k])[1] # this variable is also a dimension
k_dims = length(ds[k])
if length(size(ds[k])) == 1
k_values = ds[k][:]
elseif length(size(ds[k])) == 2
k_values = ds[k][:,:]
else
k_values = NCData(fname,k,backend,typeof(ds[k].var[:][1])) # Pointer to this variable in the file
end
if !isa(k_values,NCData) && !any(isa.(k_values,Ref(Missing)))
k_values = typeof(k_values[1]).(k_values)
end
dims[k] = NCvar(k,k_units,k_dims,k_values,k_atts,backend)
else # Not a dimension
k_dims = Array{NCvar,1}()
for d in dimnames(ds[k])
#global k_dims,dims
if !haskey(dims,d)
if haskey(ds,d) # Add the dimension
d_units = get(ds[d].attrib,"units","")
d_dims = length(ds[d])
d_values = NCData(fname,d,backend,typeof(ds[d][1])) # Pointer to this variable in the file
d_atts = Dict(ds[d].attrib)
dims[d] = NCvar(d,d_units,d_dims,d_values,d_atts,backend)
else
dims[d] = NCvar(d,"",ds.dim[d],[],Dict(),backend)
end
end
k_dims = cat(k_dims,dims[d],dims=1)
end
hasTimeDim = hastimedim(k_dims)
if ~hasTimeDim && length(k_dims) == 1# extra variable, not main field, just load the data now
k_values = ds[k][:]
elseif ~hasTimeDim && length(k_dims) == 2
k_values = ds[k][:,:]
elseif ~hasTimeDim && length(k_dims) == 3
k_values = ds[k][:,:,:]
elseif hasTimeDim
k_values = NCData(fname,k,backend,eltype(ds[k].var)) # Pointer to this variable in the file
end
if !hasTimeDim && !any(isa.(k_values,Ref(Missing)))
k_values = typeof(k_values[1]).(k_values)
end
vars[k] = NCvar(k,k_units,k_dims,k_values,k_atts,backend)
end
end
end
atts = ["_FillValue","missing_value","itile","ntile"]
fileatts = Dict()
for a in atts
if haskey(ds.attrib,a)
fileatts[a] = ds.attrib[a]
end
end
close(ds)
end
return vars,dims,fileatts
end
function readncfile_NetCDF(fname)
backend = NetCDF
ncfile = NetCDF.open(fname)
filvars = ncfile.vars
fildims = ncfile.dim
dims = Dict{String,NCvar}()
vars = Dict{String,NCvar}()
for d in keys(fildims)
d_units = get(filvars[d].atts,"units","")
d_atts = filvars[d].atts
d_dims = Int(fildims[d].dimlen)
if haskey(filvars,d)
d_prec = eltype(filvars[d])
d_values = NCData(fname,d,backend,d_prec)
vars[d] = NCvar(d,d_units,d_dims,d_values,d_atts,backend)
else
d_values = []
end
dims[d] = NCvar(d,d_units,d_dims,d_values,d_atts,backend)
end
for v in keys(filvars)
if ~haskey(vars,v)
v_units = get(filvars[v].atts,"units","")
v_atts = filvars[v].atts
dimnames = [d.name for d in filvars[v].dim]
v_dims = [dims[d] for d in dimnames]
v_prec = eltype(filvars[v])
v_vals = NCData(fname,v,backend,v_prec)
vars[v] = NCvar(v,v_units,v_dims,v_vals,v_atts,backend)
end
end
fileatts = ncfile.gatts
# Need to take care of order of attributes, read in as Dict and so does not maintain order from file
return vars,dims,fileatts
end