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gribcreatecopy.cpp
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gribcreatecopy.cpp
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/******************************************************************************
*
* Project: GRIB Driver
* Purpose: GDALDataset driver for GRIB translator for write support
* Author: Even Rouault <even dot rouault at spatialys dot com>
*
******************************************************************************
* Copyright (c) 2017, Even Rouault <even dot rouault at spatialys dot com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************
*
*/
/* Support for GRIB2 write capabilities has been funded by Meteorological */
/* Service of Canada */
#include "cpl_port.h"
#include "gribdataset.h"
#include "gdal_priv_templates.hpp"
#include "memdataset.h"
#include <algorithm>
#include <limits>
#include "degrib/degrib/meta.h"
CPL_C_START
#include "degrib/g2clib/grib2.h"
CPL_C_END
/************************************************************************/
/* Lon180to360() */
/************************************************************************/
static inline double Lon180to360(double lon)
{
if (lon == 180) return 180;
return fmod(fmod(lon, 360) + 360, 360);
}
/************************************************************************/
/* WriteByte() */
/************************************************************************/
static bool WriteByte( VSILFILE* fp, int nVal )
{
GByte byVal = static_cast<GByte>(nVal);
return VSIFWriteL(&byVal, 1, sizeof(byVal), fp) == sizeof(byVal);
}
/************************************************************************/
/* WriteSByte() */
/************************************************************************/
static bool WriteSByte( VSILFILE* fp, int nVal )
{
signed char sVal = static_cast<signed char>(nVal);
if( sVal == std::numeric_limits<signed char>::min() )
sVal = std::numeric_limits<signed char>::min() + 1;
GByte nUnsignedVal = (sVal < 0) ?
static_cast<GByte>(-sVal) | 0x80U : static_cast<GByte>(sVal);
return VSIFWriteL(&nUnsignedVal, 1, sizeof(nUnsignedVal), fp) ==
sizeof(nUnsignedVal);
}
/************************************************************************/
/* WriteUInt16() */
/************************************************************************/
static bool WriteUInt16( VSILFILE* fp, int nVal )
{
GUInt16 usVal = static_cast<GUInt16>(nVal);
CPL_MSBPTR16(&usVal);
return VSIFWriteL(&usVal, 1, sizeof(usVal), fp) == sizeof(usVal);
}
/************************************************************************/
/* WriteInt16() */
/************************************************************************/
static bool WriteInt16( VSILFILE* fp, int nVal )
{
GInt16 sVal = static_cast<GInt16>(nVal);
if( sVal == std::numeric_limits<GInt16>::min() )
sVal = std::numeric_limits<GInt16>::min() + 1;
GUInt16 nUnsignedVal = (sVal < 0) ?
static_cast<GUInt16>(-sVal) | 0x8000U : static_cast<GUInt16>(sVal);
CPL_MSBPTR16(&nUnsignedVal);
return VSIFWriteL(&nUnsignedVal, 1, sizeof(nUnsignedVal), fp)
== sizeof(nUnsignedVal);
}
/************************************************************************/
/* WriteUInt32() */
/************************************************************************/
static bool WriteUInt32( VSILFILE* fp, GUInt32 nVal )
{
CPL_MSBPTR32(&nVal);
return VSIFWriteL(&nVal, 1, sizeof(nVal), fp) == sizeof(nVal);
}
/************************************************************************/
/* WriteInt32() */
/************************************************************************/
static bool WriteInt32( VSILFILE* fp, GInt32 nVal )
{
if( nVal == std::numeric_limits<GInt32>::min() )
nVal = std::numeric_limits<GInt32>::min() + 1;
GUInt32 nUnsignedVal = (nVal < 0) ?
static_cast<GUInt32>(-nVal) | 0x80000000U : static_cast<GUInt32>(nVal);
CPL_MSBPTR32(&nUnsignedVal);
return VSIFWriteL(&nUnsignedVal, 1, sizeof(nUnsignedVal), fp)
== sizeof(nUnsignedVal);
}
/************************************************************************/
/* WriteFloat32() */
/************************************************************************/
static bool WriteFloat32( VSILFILE* fp, float fVal )
{
CPL_MSBPTR32(&fVal);
return VSIFWriteL(&fVal, 1, sizeof(fVal), fp) == sizeof(fVal);
}
/************************************************************************/
/* PatchSectionSize() */
/************************************************************************/
static void PatchSectionSize( VSILFILE* fp, vsi_l_offset nStartSection )
{
vsi_l_offset nCurOffset = VSIFTellL(fp);
VSIFSeekL(fp, nStartSection, SEEK_SET);
GUInt32 nSect3Size = static_cast<GUInt32>(nCurOffset - nStartSection);
WriteUInt32(fp, nSect3Size);
VSIFSeekL(fp, nCurOffset, SEEK_SET);
}
/************************************************************************/
/* GRIB2Section3Writer */
/************************************************************************/
class GRIB2Section3Writer
{
VSILFILE* fp;
GDALDataset *poSrcDS;
OGRSpatialReference oSRS;
const char* pszProjection;
double dfLLX, dfLLY, dfURX, dfURY;
double adfGeoTransform[6];
int nSplitAndSwapColumn = 0;
bool WriteScaled(double dfVal, double dfUnit);
bool TransformToGeo(double& dfX, double& dfY);
bool WriteEllipsoidAndRasterSize();
bool WriteGeographic();
bool WriteMercator1SP();
bool WriteMercator2SP(OGRSpatialReference* poSRS = nullptr);
bool WriteTransverseMercator();
bool WritePolarSteregraphic();
bool WriteLCC1SP();
bool WriteLCC2SPOrAEA(OGRSpatialReference* poSRS = nullptr);
bool WriteLAEA();
public:
GRIB2Section3Writer( VSILFILE* fpIn, GDALDataset *poSrcDSIn );
inline int SplitAndSwap() const { return nSplitAndSwapColumn; }
bool Write();
};
/************************************************************************/
/* GRIB2Section3Writer() */
/************************************************************************/
GRIB2Section3Writer::GRIB2Section3Writer( VSILFILE* fpIn,
GDALDataset *poSrcDSIn ) :
fp(fpIn),
poSrcDS(poSrcDSIn)
{
oSRS.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
oSRS.importFromWkt( poSrcDS->GetProjectionRef() );
pszProjection = oSRS.GetAttrValue("PROJECTION");
poSrcDS->GetGeoTransform(adfGeoTransform);
dfLLX = adfGeoTransform[0] + adfGeoTransform[1] / 2;
dfLLY = adfGeoTransform[3] + adfGeoTransform[5] / 2 +
(poSrcDS->GetRasterYSize() - 1) * adfGeoTransform[5];
dfURX = adfGeoTransform[0] + adfGeoTransform[1] / 2 +
(poSrcDS->GetRasterXSize() - 1) * adfGeoTransform[1];
dfURY = adfGeoTransform[3] + adfGeoTransform[5] / 2;
if( dfURY < dfLLY )
{
double dfTemp = dfURY;
dfURY = dfLLY;
dfLLY = dfTemp;
}
}
/************************************************************************/
/* WriteEllipsoidAndRasterSize() */
/************************************************************************/
bool GRIB2Section3Writer::WriteEllipsoidAndRasterSize()
{
const double dfSemiMajor = oSRS.GetSemiMajor();
const double dfSemiMinor = oSRS.GetSemiMinor();
const double dfInvFlattening = oSRS.GetInvFlattening();
if( std::abs(dfSemiMajor-6378137.0) < 0.01
&& std::abs(dfInvFlattening-298.257223563) < 1e-9 ) // WGS84
{
WriteByte(fp, 5); // WGS84
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
}
else if( std::abs(dfSemiMajor-6378137.0) < 0.01
&& std::abs(dfInvFlattening-298.257222101) < 1e-9 ) // GRS80
{
WriteByte(fp, 4); // GRS80
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
}
else if( dfInvFlattening == 0 )
{
// Earth assumed spherical with radius specified (in m)
// by data producer
WriteByte(fp, 1);
WriteByte(fp, 2); // scale = * 100
WriteUInt32(fp, static_cast<GUInt32>(dfSemiMajor * 100 + 0.5));
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
}
else
{
// Earth assumed oblate spheroid with major and minor axes
// specified (in m) by data producer
WriteByte(fp, 7);
WriteByte(fp, GRIB2MISSING_u1);
WriteUInt32(fp, GRIB2MISSING_u4);
WriteByte(fp, 2); // scale = * 100
WriteUInt32(fp, static_cast<GUInt32>(dfSemiMajor * 100 + 0.5));
WriteByte(fp, 2); // scale = * 100
WriteUInt32(fp, static_cast<GUInt32>(dfSemiMinor * 100 + 0.5));
}
WriteUInt32(fp, poSrcDS->GetRasterXSize());
WriteUInt32(fp, poSrcDS->GetRasterYSize());
return true;
}
/************************************************************************/
/* WriteScaled() */
/************************************************************************/
bool GRIB2Section3Writer::WriteScaled(double dfVal, double dfUnit)
{
return WriteInt32( fp, static_cast<GInt32>(floor(dfVal / dfUnit + 0.5)) );
}
/************************************************************************/
/* WriteGeographic() */
/************************************************************************/
bool GRIB2Section3Writer::WriteGeographic()
{
WriteUInt16(fp, GS3_LATLON); // Grid template number
WriteEllipsoidAndRasterSize();
if (dfLLX < 0 &&
CPLTestBool(CPLGetConfigOption("GRIB_ADJUST_LONGITUDE_RANGE", "YES")))
{
CPLDebug("GRIB", "Source longitude range is %lf to %lf", dfLLX, dfURX);
double dfOrigLLX = dfLLX;
dfLLX = Lon180to360(dfLLX);
dfURX = Lon180to360(dfURX);
if (dfLLX > dfURX)
{
if (fabs(360 - poSrcDS->GetRasterXSize() * adfGeoTransform[1]) <
adfGeoTransform[1] / 4)
{
// Find the first row number east of the prime meridian
nSplitAndSwapColumn =
static_cast<int>(ceil((0 - dfOrigLLX) / adfGeoTransform[1]));
CPLDebug("GRIB",
"Rewrapping around the prime meridian at column %d",
nSplitAndSwapColumn);
dfLLX = 0;
dfURX = 360 - adfGeoTransform[1];
}
else
{
CPLDebug("GRIB",
"Writing a GRIB with 0-360 longitudes crossing the prime meridian");
}
}
CPLDebug("GRIB", "Target longitudes range is %lf %lf", dfLLX, dfURX);
}
WriteUInt32(fp, 0); // Basic angle. 0 equivalent of 1
// Subdivisions of basic angle used. ~0 equivalent of 10^6
WriteUInt32(fp, GRIB2MISSING_u4);
const double dfAngUnit = 1e-6;
WriteScaled(dfLLY, dfAngUnit);
WriteScaled(dfLLX, dfAngUnit);
WriteByte(fp, GRIB2BIT_3 | GRIB2BIT_4); // Resolution and component flags
WriteScaled(dfURY, dfAngUnit);
WriteScaled(dfURX, dfAngUnit);
WriteScaled(adfGeoTransform[1], dfAngUnit);
WriteScaled(fabs(adfGeoTransform[5]), dfAngUnit);
WriteByte(fp, GRIB2BIT_2); // Scanning mode: bottom-to-top
return true;
}
/************************************************************************/
/* TransformToGeo() */
/************************************************************************/
bool GRIB2Section3Writer::TransformToGeo(double& dfX, double& dfY)
{
OGRSpatialReference oLL; // Construct the "geographic" part of oSRS.
oLL.CopyGeogCSFrom(&oSRS);
oLL.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
OGRCoordinateTransformation *poTransformSRSToLL =
OGRCreateCoordinateTransformation( &(oSRS), &(oLL));
if( poTransformSRSToLL == nullptr ||
!poTransformSRSToLL->Transform(1, &dfX, &dfY) )
{
delete poTransformSRSToLL;
return false;
}
delete poTransformSRSToLL;
if( dfX < 0.0 )
dfX += 360.0;
return true;
}
/************************************************************************/
/* WriteMercator1SP() */
/************************************************************************/
bool GRIB2Section3Writer::WriteMercator1SP()
{
if( oSRS.GetNormProjParm(SRS_PP_CENTRAL_MERIDIAN, 0.0) != 0.0 )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Mercator_1SP with central_meridian != 0 not supported");
return false;
}
if( oSRS.GetNormProjParm(SRS_PP_LATITUDE_OF_ORIGIN, 0.0) != 0.0 )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Mercator_1SP with latitude_of_origin != 0 not supported");
return false;
}
OGRSpatialReference* poMerc2SP =
oSRS.convertToOtherProjection(SRS_PT_MERCATOR_2SP);
if( poMerc2SP == nullptr )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Cannot get Mercator_2SP formulation");
return false;
}
bool bRet = WriteMercator2SP(poMerc2SP);
delete poMerc2SP;
return bRet;
}
/************************************************************************/
/* WriteMercator2SP() */
/************************************************************************/
bool GRIB2Section3Writer::WriteMercator2SP(OGRSpatialReference* poSRS)
{
if( poSRS == nullptr )
poSRS = &oSRS;
if( poSRS->GetNormProjParm(SRS_PP_CENTRAL_MERIDIAN, 0.0) != 0.0 )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Mercator_2SP with central_meridian != 0 not supported");
return false;
}
if( poSRS->GetNormProjParm(SRS_PP_LATITUDE_OF_ORIGIN, 0.0) != 0.0 )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Mercator_2SP with latitude_of_origin != 0 not supported");
return false;
}
WriteUInt16(fp, GS3_MERCATOR); // Grid template number
WriteEllipsoidAndRasterSize();
if( !TransformToGeo(dfLLX, dfLLY) || !TransformToGeo(dfURX, dfURY) )
return false;
const double dfAngUnit = 1e-6;
WriteScaled(dfLLY, dfAngUnit);
WriteScaled(dfLLX, dfAngUnit);
WriteByte(fp, GRIB2BIT_3 | GRIB2BIT_4); // Resolution and component flags
WriteScaled(
poSRS->GetNormProjParm(SRS_PP_STANDARD_PARALLEL_1, 0.0), dfAngUnit);
WriteScaled(dfURY, dfAngUnit);
WriteScaled(dfURX, dfAngUnit);
WriteByte(fp , GRIB2BIT_2 ); // Scanning mode: bottom-to-top
WriteInt32(fp, 0); // angle of the grid
const double dfLinearUnit = 1e-3;
WriteScaled(adfGeoTransform[1], dfLinearUnit);
WriteScaled(fabs(adfGeoTransform[5]), dfLinearUnit);
return true;
}
/************************************************************************/
/* WriteTransverseMercator() */
/************************************************************************/
bool GRIB2Section3Writer::WriteTransverseMercator()
{
WriteUInt16(fp, GS3_TRANSVERSE_MERCATOR); // Grid template number
WriteEllipsoidAndRasterSize();
const double dfAngUnit = 1e-6;
WriteScaled(
oSRS.GetNormProjParm(SRS_PP_LATITUDE_OF_ORIGIN, 0.0), dfAngUnit);
WriteScaled(Lon180to360(oSRS.GetNormProjParm(SRS_PP_CENTRAL_MERIDIAN, 0.0)), dfAngUnit);
WriteByte(fp, GRIB2BIT_3 | GRIB2BIT_4); // Resolution and component flags
float fScale = static_cast<float>(oSRS.GetNormProjParm(
SRS_PP_SCALE_FACTOR, 0.0));
WriteFloat32( fp, fScale );
const double dfLinearUnit = 1e-2;
WriteScaled(
oSRS.GetNormProjParm(SRS_PP_FALSE_EASTING, 0.0), dfLinearUnit);
WriteScaled(
oSRS.GetNormProjParm(SRS_PP_FALSE_NORTHING, 0.0), dfLinearUnit);
WriteByte(fp, GRIB2BIT_2); // Scanning mode: bottom-to-top
WriteScaled(adfGeoTransform[1], dfLinearUnit);
WriteScaled(fabs(adfGeoTransform[5]), dfLinearUnit);
WriteScaled(dfLLX, dfLinearUnit);
WriteScaled(dfLLY, dfLinearUnit);
WriteScaled(dfURX, dfLinearUnit);
WriteScaled(dfURY, dfLinearUnit);
return true;
}
/************************************************************************/
/* WritePolarSteregraphic() */
/************************************************************************/
bool GRIB2Section3Writer::WritePolarSteregraphic()
{
WriteUInt16(fp, GS3_POLAR); // Grid template number
WriteEllipsoidAndRasterSize();
if( !TransformToGeo(dfLLX, dfLLY) )
return false;
const double dfAngUnit = 1e-6;
WriteScaled(dfLLY, dfAngUnit);
WriteScaled(dfLLX, dfAngUnit);
WriteByte(fp, GRIB2BIT_3 | GRIB2BIT_4); // Resolution and component flags
const double dfLatOrigin = oSRS.GetNormProjParm(
SRS_PP_LATITUDE_OF_ORIGIN, 0.0);
WriteScaled(dfLatOrigin, dfAngUnit);
WriteScaled(Lon180to360(oSRS.GetNormProjParm(
SRS_PP_CENTRAL_MERIDIAN, 0.0)), dfAngUnit);
const double dfLinearUnit = 1e-3;
WriteScaled(adfGeoTransform[1], dfLinearUnit);
WriteScaled(fabs(adfGeoTransform[5]), dfLinearUnit);
// Projection center flag: BIT1=0 North Pole, BIT1=1 South Pole
WriteByte(fp, (dfLatOrigin < 0) ? GRIB2BIT_1 : 0);
WriteByte(fp, GRIB2BIT_2); // Scanning mode: bottom-to-top
return true;
}
/************************************************************************/
/* WriteLCC1SP() */
/************************************************************************/
bool GRIB2Section3Writer::WriteLCC1SP()
{
OGRSpatialReference* poLCC2SP =
oSRS.convertToOtherProjection(SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP);
if( poLCC2SP == nullptr )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Cannot get Lambert_Conformal_Conic_2SP formulation");
return false;
}
bool bRet = WriteLCC2SPOrAEA(poLCC2SP);
delete poLCC2SP;
return bRet;
}
/************************************************************************/
/* WriteLCC2SPOrAEA() */
/************************************************************************/
bool GRIB2Section3Writer::WriteLCC2SPOrAEA(OGRSpatialReference* poSRS)
{
if( poSRS == nullptr )
poSRS = &oSRS;
if( EQUAL(poSRS->GetAttrValue("PROJECTION"),
SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP) )
WriteUInt16(fp, GS3_LAMBERT); // Grid template number
else
WriteUInt16(fp, GS3_ALBERS_EQUAL_AREA); // Grid template number
WriteEllipsoidAndRasterSize();
if( !TransformToGeo(dfLLX, dfLLY) )
return false;
const double dfAngUnit = 1e-6;
WriteScaled(dfLLY, dfAngUnit);
WriteScaled(dfLLX, dfAngUnit);
// Resolution and component flags. "not applicable" ==> 0 ?
WriteByte( fp, 0);
WriteScaled(
poSRS->GetNormProjParm(SRS_PP_LATITUDE_OF_ORIGIN, 0.0), dfAngUnit);
WriteScaled(Lon180to360(oSRS.GetNormProjParm(
SRS_PP_CENTRAL_MERIDIAN, 0.0)), dfAngUnit);
const double dfLinearUnit = 1e-3;
WriteScaled(adfGeoTransform[1], dfLinearUnit);
WriteScaled(fabs(adfGeoTransform[5]), dfLinearUnit);
WriteByte(fp, 0); // Projection centre flag
WriteByte(fp, GRIB2BIT_2); // Scanning mode: bottom-to-top
WriteScaled(
poSRS->GetNormProjParm(SRS_PP_STANDARD_PARALLEL_1, 0.0), dfAngUnit);
WriteScaled(
poSRS->GetNormProjParm(SRS_PP_STANDARD_PARALLEL_2, 0.0), dfAngUnit);
// Latitude of the southern pole of projection
WriteUInt32( fp, GRIB2MISSING_u4 );
// Longitude of the southern pole of projection
WriteUInt32( fp, GRIB2MISSING_u4 );
return true;
}
/************************************************************************/
/* WriteLAEA() */
/************************************************************************/
bool GRIB2Section3Writer::WriteLAEA()
{
WriteUInt16(fp, GS3_LAMBERT_AZIMUTHAL); // Grid template number
WriteEllipsoidAndRasterSize();
if( !TransformToGeo(dfLLX, dfLLY) || !TransformToGeo(dfURX, dfURY) )
return false;
const double dfAngUnit = 1e-6;
WriteScaled(dfLLY, dfAngUnit);
WriteScaled(dfLLX, dfAngUnit);
WriteScaled(
oSRS.GetNormProjParm(SRS_PP_LATITUDE_OF_CENTER, 0.0), dfAngUnit);
WriteScaled(Lon180to360(oSRS.GetNormProjParm(
SRS_PP_LONGITUDE_OF_CENTER, 0.0)), dfAngUnit);
WriteByte( fp, GRIB2BIT_3 | GRIB2BIT_4); // Resolution and component flags
const double dfLinearUnit = 1e-3;
WriteScaled(adfGeoTransform[1], dfLinearUnit);
WriteScaled(fabs(adfGeoTransform[5]), dfLinearUnit);
WriteByte(fp, GRIB2BIT_2); // Scanning mode: bottom-to-top
return true;
}
/************************************************************************/
/* Write() */
/************************************************************************/
bool GRIB2Section3Writer::Write()
{
// Section 3: Grid Definition Section
vsi_l_offset nStartSection = VSIFTellL(fp);
WriteUInt32(fp, GRIB2MISSING_u4); // section size
WriteByte(fp, 3); // section number
// Source of grid definition = Specified in Code Table 3.1
WriteByte(fp, 0);
const GUInt32 nDataPoints =
static_cast<GUInt32>(poSrcDS->GetRasterXSize()) *
poSrcDS->GetRasterYSize();
WriteUInt32(fp, nDataPoints);
// Number of octets for optional list of numbers defining number of points
WriteByte(fp, 0);
// Interpretation of list of numbers defining number of points =
// No appended list
WriteByte(fp, 0);
bool bRet = false;
if( oSRS.IsGeographic() )
{
bRet = WriteGeographic();
}
else if( pszProjection && EQUAL(pszProjection, SRS_PT_MERCATOR_1SP) )
{
bRet = WriteMercator1SP();
}
else if( pszProjection && EQUAL(pszProjection, SRS_PT_MERCATOR_2SP) )
{
bRet = WriteMercator2SP();
}
else if( pszProjection && EQUAL(pszProjection, SRS_PT_TRANSVERSE_MERCATOR) )
{
bRet = WriteTransverseMercator();
}
else if( pszProjection &&
EQUAL(pszProjection, SRS_PT_POLAR_STEREOGRAPHIC) )
{
bRet = WritePolarSteregraphic();
}
else if( pszProjection != nullptr &&
EQUAL(pszProjection, SRS_PT_LAMBERT_CONFORMAL_CONIC_1SP) )
{
bRet = WriteLCC1SP();
}
else if( pszProjection != nullptr &&
(EQUAL(pszProjection, SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP) ||
EQUAL(pszProjection, SRS_PT_ALBERS_CONIC_EQUAL_AREA)) )
{
bRet = WriteLCC2SPOrAEA();
}
else if( pszProjection &&
EQUAL(pszProjection, SRS_PT_LAMBERT_AZIMUTHAL_EQUAL_AREA) )
{
bRet = WriteLAEA();
}
PatchSectionSize( fp, nStartSection );
return bRet;
}
/************************************************************************/
/* GetBandOption() */
/************************************************************************/
static const char* GetBandOption(char** papszOptions,
GDALDataset* poSrcDS,
int nBand,
const char* pszKey, const char* pszDefault)
{
const char* pszVal = CSLFetchNameValue(papszOptions,
CPLSPrintf("BAND_%d_%s", nBand, pszKey));
if( pszVal == nullptr )
{
pszVal = CSLFetchNameValue(papszOptions, pszKey);
}
if( pszVal == nullptr && poSrcDS != nullptr )
{
pszVal = poSrcDS->GetRasterBand(nBand)->GetMetadataItem(
(CPLString("GRIB_") + pszKey).c_str());
}
if( pszVal == nullptr )
{
pszVal = pszDefault;
}
return pszVal;
}
/************************************************************************/
/* GRIB2Section567Writer */
/************************************************************************/
class GRIB2Section567Writer
{
VSILFILE *m_fp;
GDALDataset *m_poSrcDS;
int m_nBand;
int m_nXSize;
int m_nYSize;
GUInt32 m_nDataPoints;
GDALDataType m_eDT;
double m_adfGeoTransform[6];
int m_nDecimalScaleFactor;
double m_dfDecimalScale;
float m_fMin;
float m_fMax;
double m_dfMinScaled;
int m_nBits;
bool m_bUseZeroBits;
float m_fValOffset;
int m_bHasNoData;
double m_dfNoData;
int m_nSplitAndSwap;
float* GetFloatData();
bool WriteSimplePacking();
bool WriteComplexPacking(int nSpatialDifferencingOrder);
bool WriteIEEE(GDALProgressFunc pfnProgress,
void * pProgressData);
bool WritePNG();
bool WriteJPEG2000(char** papszOptions);
public:
GRIB2Section567Writer( VSILFILE* fp,
GDALDataset *poSrcDS,
int nBand,
int nSplitAndSwap );
bool Write(float fValOffset,
char** papszOptions,
GDALProgressFunc pfnProgress, void * pProgressData);
void WriteComplexPackingNoData();
};
/************************************************************************/
/* GRIB2Section567Writer() */
/************************************************************************/
GRIB2Section567Writer::GRIB2Section567Writer( VSILFILE* fp,
GDALDataset *poSrcDS,
int nBand,
int nSplitAndSwap ):
m_fp(fp),
m_poSrcDS(poSrcDS),
m_nBand(nBand),
m_nXSize(poSrcDS->GetRasterXSize()),
m_nYSize(poSrcDS->GetRasterYSize()),
m_nDataPoints(static_cast<GUInt32>(m_nXSize) * m_nYSize),
m_eDT(m_poSrcDS->GetRasterBand(m_nBand)->GetRasterDataType()),
m_nDecimalScaleFactor(0),
m_dfDecimalScale(1.0),
m_fMin(0.0f),
m_fMax(0.0f),
m_dfMinScaled(0.0),
m_nBits(0),
m_bUseZeroBits(false),
m_fValOffset(0.0),
m_bHasNoData(false),
m_dfNoData(0.0),
m_nSplitAndSwap(nSplitAndSwap)
{
m_poSrcDS->GetGeoTransform(m_adfGeoTransform);
m_dfNoData = m_poSrcDS->GetRasterBand(nBand)->GetNoDataValue(&m_bHasNoData);
}
/************************************************************************/
/* GetFloatData() */
/************************************************************************/
float* GRIB2Section567Writer::GetFloatData()
{
float* pafData =
static_cast<float*>(VSI_MALLOC2_VERBOSE(m_nDataPoints, sizeof(float)));
if( pafData == nullptr )
{
return nullptr;
}
CPLErr eErr = m_poSrcDS->GetRasterBand(m_nBand)->RasterIO(
GF_Read,
m_nSplitAndSwap, 0,
m_nXSize - m_nSplitAndSwap, m_nYSize,
pafData + (m_adfGeoTransform[5] < 0 ? (m_nYSize - 1) * m_nXSize : 0),
m_nXSize - m_nSplitAndSwap, m_nYSize,
GDT_Float32,
sizeof(float),
m_adfGeoTransform[5] < 0 ?
-static_cast<GSpacing>(m_nXSize * sizeof(float)):
static_cast<GSpacing>(m_nXSize * sizeof(float)),
nullptr);
if (eErr != CE_None)
{
VSIFree(pafData);
return nullptr;
}
if (m_nSplitAndSwap > 0)
{
eErr = m_poSrcDS->GetRasterBand(m_nBand)->RasterIO(
GF_Read,
0, 0,
m_nSplitAndSwap, m_nYSize,
pafData + (m_adfGeoTransform[5] < 0 ? (m_nYSize - 1) * m_nXSize : 0) +
(m_nXSize - m_nSplitAndSwap),
m_nSplitAndSwap, m_nYSize,
GDT_Float32,
sizeof(float),
m_adfGeoTransform[5] < 0
? -static_cast<GSpacing>(m_nXSize * sizeof(float))
: static_cast<GSpacing>(m_nXSize * sizeof(float)),
nullptr);
if (eErr != CE_None)
{
VSIFree(pafData);
return nullptr;
}
}
m_fMin = std::numeric_limits<float>::max();
m_fMax = -std::numeric_limits<float>::max();
bool bHasNoDataValuePoint = false;
bool bHasDataValuePoint = false;
for( GUInt32 i = 0; i < m_nDataPoints; i++ )
{
if( m_bHasNoData && pafData[i] == static_cast<float>(m_dfNoData) )
{
if (!bHasNoDataValuePoint) bHasNoDataValuePoint = true;
continue;
}
if( !CPLIsFinite( pafData[i] ) )
{
CPLError(CE_Failure, CPLE_NotSupported,
"Non-finite values not supported for "
"this data encoding");
VSIFree(pafData);
return nullptr;
}
if (!bHasDataValuePoint) bHasDataValuePoint = true;
pafData[i] += m_fValOffset;
if( pafData[i] < m_fMin ) m_fMin = pafData[i];
if( pafData[i] > m_fMax ) m_fMax = pafData[i];
}
if( m_fMin > m_fMax )
{
m_fMin = m_fMax = static_cast<float>(m_dfNoData);
}
// We check that the actual range of values got from the above RasterIO
// request does not go over the expected range of the datatype, as we
// later assume that for computing nMaxBitsPerElt.
// This shouldn't happen for well-behaved drivers, but this can still
// happen in practice, if some drivers don't completely fill buffers etc.
if( m_fMax > m_fMin &&
GDALDataTypeIsInteger(m_eDT) &&
ceil(log(m_fMax - m_fMin) / log(2.0)) > GDALGetDataTypeSize(m_eDT) )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Garbage values found when requesting input dataset");
VSIFree(pafData);
return nullptr;
}
m_dfMinScaled =
m_dfDecimalScale == 1.0 ? m_fMin : floor(m_fMin * m_dfDecimalScale);
if( !(m_dfMinScaled >= -std::numeric_limits<float>::max() &&
m_dfMinScaled < std::numeric_limits<float>::max()) )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Scaled min value not representable on IEEE754 "
"single precision float");
VSIFree(pafData);
return nullptr;
}
const double dfScaledMaxDiff = (m_fMax-m_fMin)* m_dfDecimalScale;
if( GDALDataTypeIsFloating(m_eDT) && m_nBits == 0 &&
dfScaledMaxDiff > 0 && dfScaledMaxDiff <= 256 )
{
m_nBits = 8;
}
m_bUseZeroBits = ( m_fMin == m_fMax && !(bHasDataValuePoint && bHasNoDataValuePoint) ) ||
(!GDALDataTypeIsFloating(m_eDT) && dfScaledMaxDiff < 1.0);
return pafData;
}
/************************************************************************/
/* WriteSimplePacking() */
/************************************************************************/
// See http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_temp5-0.shtml
bool GRIB2Section567Writer::WriteSimplePacking()
{
float* pafData = GetFloatData();
if( pafData == nullptr )
return false;
const int nBitCorrectionForDec = static_cast<int>(
ceil(m_nDecimalScaleFactor * log(10.0) / log(2.0)));
const int nMaxBitsPerElt = std::max(1, std::min(31, (m_nBits > 0) ? m_nBits:
GDALGetDataTypeSize(m_eDT)+ nBitCorrectionForDec));
if( nMaxBitsPerElt > 0 &&
m_nDataPoints > static_cast<GUInt32>(INT_MAX) / nMaxBitsPerElt )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Int overflow while computing maximum number of bits");
VSIFree(pafData);
return false;
}
const int nMaxSize = (m_nDataPoints * nMaxBitsPerElt + 7) / 8;
void* pabyData = VSI_MALLOC_VERBOSE(nMaxSize);
if( pabyData == nullptr )
{
VSIFree(pafData);
VSIFree(pabyData);
return false;
}
// Indices expected by simpack()
enum
{
TMPL5_R_IDX = 0, // Reference value (R)
TMPL5_E_IDX = 1, // Binary scale factor (E)
TMPL5_D_IDX = 2, // Decimal scale factor (D)
TMPL5_NBITS_IDX = 3, // Number of bits used for each packed value
TMPL5_TYPE_IDX = 4 // type of original data
};
g2int idrstmpl[TMPL5_TYPE_IDX+1]= { 0 };
idrstmpl[TMPL5_R_IDX] = 0; // reference value, to be filled by simpack
idrstmpl[TMPL5_E_IDX] = 0; // binary scale factor, to be filled by simpack
idrstmpl[TMPL5_D_IDX] = m_nDecimalScaleFactor;
// to be filled by simpack if set to 0
idrstmpl[TMPL5_NBITS_IDX] = m_nBits;
// to be filled by simpack (and we will ignore it)
idrstmpl[TMPL5_TYPE_IDX] = 0;
g2int nLengthPacked = 0;
simpack(pafData,m_nDataPoints,idrstmpl,
static_cast<unsigned char*>(pabyData),&nLengthPacked);
CPLAssert(nLengthPacked <= nMaxSize);
if( nLengthPacked < 0 )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Error while packing");
VSIFree(pafData);
VSIFree(pabyData);
return false;
}
// Section 5: Data Representation Section
WriteUInt32(m_fp, 21); // section size
WriteByte(m_fp, 5); // section number
WriteUInt32(m_fp, m_nDataPoints);
WriteUInt16(m_fp, GS5_SIMPLE);
float fRefValue;
memcpy(&fRefValue, &idrstmpl[TMPL5_R_IDX], 4);
WriteFloat32(m_fp, fRefValue);
WriteInt16(m_fp, idrstmpl[TMPL5_E_IDX]);
WriteInt16(m_fp, idrstmpl[TMPL5_D_IDX]);
WriteByte(m_fp, idrstmpl[TMPL5_NBITS_IDX]);
// Type of original data: 0=Floating, 1=Integer
WriteByte(m_fp, GDALDataTypeIsFloating(m_eDT) ? 0 : 1);
// Section 6: Bitmap section
#ifdef DEBUG
if( CPLTestBool(CPLGetConfigOption("GRIB_WRITE_BITMAP_TEST", "NO")) )
{
// Just for the purpose of generating a test product !
static int counter = 0;
counter++;
if( counter == 1 )
{
WriteUInt32(m_fp, 6 + ((m_nDataPoints + 7) / 8)); // section size
WriteByte(m_fp, 6); // section number
WriteByte(m_fp, 0); // bitmap
for( GUInt32 i = 0; i < (m_nDataPoints + 7) / 8; i++)
WriteByte(m_fp, 255);
}
else
{
WriteUInt32(m_fp, 6); // section size
WriteByte(m_fp, 6); // section number
WriteByte(m_fp, 254); // reuse previous bitmap
}
}