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mdal_gdal.cpp
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mdal_gdal.cpp
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/*
MDAL - Mesh Data Abstraction Library (MIT License)
Copyright (C) 2018 Peter Petrik (zilolv at gmail dot com)
*/
#include "mdal_gdal.hpp"
#include <assert.h>
#include <limits>
#include <gdal.h>
#include <cmath>
#include "ogr_api.h"
#include "ogr_srs_api.h"
#include "gdal_alg.h"
#include "mdal_utils.hpp"
#include "mdal_logger.hpp"
#define MDAL_NODATA -9999
void MDAL::GdalDataset::init( const std::string &dsName )
{
mDatasetName = dsName;
// Open dataset
mHDataset = GDALOpen( dsName.data(), GA_ReadOnly );
if ( !mHDataset ) throw MDAL::Error( MDAL_Status::Err_UnknownFormat, "Unable to open dataset " + mDatasetName + " (unknown format)" );
// Now parse it
parseParameters();
parseProj();
}
void MDAL::GdalDataset::parseParameters()
{
mNBands = static_cast<unsigned int>( GDALGetRasterCount( mHDataset ) );
if ( mNBands == 0 ) throw MDAL::Error( MDAL_Status::Err_InvalidData, "Unable to get parameters from dataset" );
GDALGetGeoTransform( mHDataset, mGT ); // in case of error it returns Identid
mXSize = static_cast<unsigned int>( GDALGetRasterXSize( mHDataset ) ); //raster width in pixels
if ( mXSize == 0 ) throw MDAL::Error( MDAL_Status::Err_InvalidData, "Raster width is zero" );
mYSize = static_cast<unsigned int>( GDALGetRasterYSize( mHDataset ) ); //raster height in pixels
if ( mYSize == 0 ) throw MDAL::Error( MDAL_Status::Err_InvalidData, "Raster height is zero" );
mNPoints = mXSize * mYSize;
mNVolumes = ( mXSize - 1 ) * ( mYSize - 1 );
}
void MDAL::GdalDataset::parseProj()
{
char *proj = const_cast<char *>( GDALGetProjectionRef( mHDataset ) );
if ( proj != nullptr )
{
mProj = std::string( proj );
}
}
/******************************************************************************************************/
bool MDAL::DriverGdal::meshes_equals( const MDAL::GdalDataset *ds1, const MDAL::GdalDataset *ds2 ) const
{
return ( ( ds1->mXSize == ds2->mXSize ) &&
( ds1->mYSize == ds2->mYSize ) &&
( MDAL::equals( ds1->mGT[0], ds2->mGT[0] ) ) &&
( MDAL::equals( ds1->mGT[1], ds2->mGT[1] ) ) &&
( MDAL::equals( ds1->mGT[2], ds2->mGT[2] ) ) &&
( MDAL::equals( ds1->mGT[3], ds2->mGT[3] ) ) &&
( MDAL::equals( ds1->mGT[4], ds2->mGT[4] ) ) &&
( MDAL::equals( ds1->mGT[5], ds2->mGT[5] ) ) &&
ds1->mProj == ds2->mProj );
}
bool MDAL::DriverGdal::initVertices( Vertices &vertices )
{
Vertex *VertexsPtr = vertices.data();
unsigned int mXSize = meshGDALDataset()->mXSize;
unsigned int mYSize = meshGDALDataset()->mYSize;
const double *mGT = meshGDALDataset()->mGT;
for ( unsigned int y = 0; y < mYSize; ++y )
{
for ( unsigned int x = 0; x < mXSize; ++x, ++VertexsPtr )
{
// VertexsPtr->setId(x + mXSize*y);
VertexsPtr->x = mGT[0] + ( x + 0.5 ) * mGT[1] + ( y + 0.5 ) * mGT[2];
VertexsPtr->y = mGT[3] + ( x + 0.5 ) * mGT[4] + ( y + 0.5 ) * mGT[5];
VertexsPtr->z = 0.0;
}
}
BBox extent = computeExtent( vertices );
// we want to detect situation when there is whole earth represented in dataset
bool is_longitude_shifted = ( extent.minX >= 0.0 ) &&
( fabs( extent.minX + extent.maxX - 360.0 ) < 1.0 ) &&
( extent.minY >= -90.0 ) &&
( extent.maxX <= 360.0 ) &&
( extent.maxX > 180.0 ) &&
( extent.maxY <= 90.0 );
if ( is_longitude_shifted )
{
for ( Vertices::size_type n = 0; n < vertices.size(); ++n )
{
if ( vertices[n].x > 180.0 )
{
vertices[n].x -= 360.0;
}
}
}
return is_longitude_shifted;
}
void MDAL::DriverGdal::initFaces( Vertices &Vertexs, Faces &Faces, bool is_longitude_shifted )
{
int reconnected = 0;
unsigned int mXSize = meshGDALDataset()->mXSize;
unsigned int mYSize = meshGDALDataset()->mYSize;
size_t i = 0;
for ( unsigned int y = 0; y < mYSize - 1; ++y )
{
for ( unsigned int x = 0; x < mXSize - 1; ++x )
{
if ( is_longitude_shifted &&
( Vertexs[x + mXSize * y].x > 0.0 ) &&
( Vertexs[x + 1 + mXSize * y].x < 0.0 ) )
// omit border face
{
--reconnected;
continue;
}
if ( is_longitude_shifted && ( x == 0 ) )
{
// create extra faces around prime meridian
Faces[i].resize( 4 );
Faces[i][0] = mXSize * ( y + 1 );
Faces[i][3] = mXSize * y;
Faces[i][2] = mXSize - 1 + mXSize * y;
Faces[i][1] = mXSize - 1 + mXSize * ( y + 1 );
++reconnected;
++i;
}
// other faces
Faces[i].resize( 4 );
Faces[i][0] = x + 1 + mXSize * ( y + 1 );
Faces[i][3] = x + 1 + mXSize * y;
Faces[i][2] = x + mXSize * y;
Faces[i][1] = x + mXSize * ( y + 1 );
++i;
}
}
//make sure we have discarded same amount of faces that we have added
assert( reconnected == 0 );
}
std::string MDAL::DriverGdal::GDALFileName( const std::string &fileName )
{
return fileName;
}
double MDAL::DriverGdal::parseMetadataTime( const std::string &time_s )
{
std::string time_trimmed = MDAL::trim( time_s );
std::vector<std::string> times = MDAL::split( time_trimmed, ' ' );
return MDAL::toDouble( times[0] );
}
MDAL::DriverGdal::metadata_hash MDAL::DriverGdal::parseMetadata( GDALMajorObjectH gdalObject, const char *pszDomain /* = 0 */ )
{
MDAL::DriverGdal::metadata_hash meta;
char **GDALmetadata = nullptr;
GDALmetadata = GDALGetMetadata( gdalObject, pszDomain );
if ( GDALmetadata )
{
for ( int j = 0; GDALmetadata[j]; ++j )
{
std::string metadata_pair = GDALmetadata[j]; //KEY = VALUE
std::vector<std::string> metadata = MDAL::split( metadata_pair, '=' );
if ( metadata.size() > 1 )
{
std::string key = MDAL::toLower( metadata[0] );
metadata.erase( metadata.begin() ); // remove key
std::string value = MDAL::join( metadata, "=" );
meta[key] = value;
}
}
}
return meta;
}
void MDAL::DriverGdal::parseRasterBands( const MDAL::GdalDataset *cfGDALDataset )
{
for ( unsigned int i = 1; i <= cfGDALDataset->mNBands; ++i ) // starts with 1 .... ehm....
{
// Get Band
GDALRasterBandH gdalBand = GDALGetRasterBand( cfGDALDataset->mHDataset, static_cast<int>( i ) );
if ( !gdalBand )
{
throw MDAL::Error( MDAL_Status::Err_InvalidData, "Invalid GDAL band" );
}
// Reference time
metadata_hash global_metadata = parseMetadata( cfGDALDataset->mHDataset );
parseGlobals( global_metadata );
// Get metadata
metadata_hash metadata = parseMetadata( gdalBand );
std::string band_name;
MDAL::RelativeTimestamp time;
bool is_vector;
bool is_x;
if ( parseBandInfo( cfGDALDataset, metadata, band_name, &time, &is_vector, &is_x ) )
{
continue;
}
// Add to data structures
std::vector<GDALRasterBandH>::size_type data_count = is_vector ? 2 : 1;
std::vector<GDALRasterBandH>::size_type data_index = is_x ? 0 : 1;
if ( mBands.find( band_name ) == mBands.end() )
{
// this Face is not yet added at all
// => create new map
timestep_map qMap;
std::vector<GDALRasterBandH> raster_bands( data_count );
raster_bands[data_index] = gdalBand;
qMap[time] = raster_bands;
mBands[band_name] = qMap;
}
else
{
timestep_map::iterator timestep = mBands[band_name].find( time );
if ( timestep == mBands[band_name].end() )
{
// Face is there, but new timestep
// => create just new map entry
std::vector<GDALRasterBandH> raster_bands( data_count );
raster_bands[data_index] = gdalBand;
mBands[band_name][time] = raster_bands;
}
else
{
// Face is there, and timestep too, this must be other part
// of the existing vector
timestep->second[data_index] = gdalBand;
}
}
}
}
void MDAL::DriverGdal::fixRasterBands()
{
// go through all bands and find out if both x and y dataset are valid
// if such pair if found, make the group scalar by removal of null band pointer
// this can happen is parseBandInfo() returns false-positive in vector detection
for ( data_hash::iterator band = mBands.begin(); band != mBands.end(); band++ )
{
if ( band->second.empty() )
continue;
// scalars are always ok
bool is_scalar = ( band->second.begin()->second.size() == 1 );
if ( is_scalar )
continue;
// check if we have some null bands
int needs_fix = false;
for ( timestep_map::const_iterator time_step = band->second.begin(); time_step != band->second.end(); time_step++ )
{
std::vector<GDALRasterBandH> raster_bands = time_step->second;
if ( !raster_bands[0] )
{
needs_fix = true;
break;
}
if ( !raster_bands[1] )
{
needs_fix = true;
break;
}
}
// convert this vector to scalar
if ( needs_fix )
{
for ( timestep_map::iterator time_step = band->second.begin(); time_step != band->second.end(); time_step++ )
{
std::vector<GDALRasterBandH> &raster_bands = time_step->second;
if ( !raster_bands[0] )
{
raster_bands[0] = raster_bands[1];
}
// get rid of y-coord
raster_bands.resize( 1 );
// not we should have only 1 band and valid
assert( raster_bands[0] );
}
}
}
}
MDAL::DateTime MDAL::DriverGdal::referenceTime() const
{
return MDAL::DateTime();
}
void MDAL::DriverGdal::addDataToOutput( GDALRasterBandH raster_band, std::shared_ptr<MemoryDataset2D> tos, bool is_vector, bool is_x )
{
assert( raster_band );
// nodata
int pbSuccess;
double nodata = GDALGetRasterNoDataValue( raster_band, &pbSuccess );
if ( pbSuccess == 0 ) nodata = std::numeric_limits<double>::quiet_NaN();
bool hasNoData = !std::isnan( nodata );
// offset and scale
double offset = 0.0;
double scale = GDALGetRasterScale( raster_band, &pbSuccess );
if ( ( pbSuccess == 0 ) || MDAL::equals( scale, 0.0 ) || std::isnan( scale ) )
{
scale = 1.0;
}
else
{
offset = GDALGetRasterOffset( raster_band, &pbSuccess );
if ( ( pbSuccess == 0 ) || std::isnan( offset ) )
{
offset = 0.0;
}
}
unsigned int mXSize = meshGDALDataset()->mXSize;
unsigned int mYSize = meshGDALDataset()->mYSize;
for ( unsigned int y = 0; y < mYSize; ++y )
{
// buffering per-line
CPLErr err = GDALRasterIO(
raster_band,
GF_Read,
0, //nXOff
static_cast<int>( y ), //nYOff
static_cast<int>( mXSize ), //nXSize
1, //nYSize
mPafScanline, //pData
static_cast<int>( mXSize ), //nBufXSize
1, //nBufYSize
GDT_Float64, //eBufType
0, //nPixelSpace
0 //nLineSpace
);
if ( err != CE_None )
{
throw MDAL::Error( MDAL_Status::Err_InvalidData, "Error while buffering data to output" );
}
for ( unsigned int x = 0; x < mXSize; ++x )
{
unsigned int idx = x + mXSize * y;
double val = mPafScanline[x];
if ( !hasNoData || !MDAL::equals( val, nodata ) )
{
// Apply scale and offset
val = val * scale + offset;
// values is prepolulated with NODATA values, so store only legal values
if ( is_vector )
{
if ( is_x )
{
tos->setValueX( idx, val );
}
else
{
tos->setValueY( idx, val );
}
}
else
{
tos->setScalarValue( idx, val );
}
}
}
}
}
void MDAL::DriverGdal::addDatasetGroups()
{
// Add dataset to mMesh
for ( data_hash::const_iterator band = mBands.begin(); band != mBands.end(); band++ )
{
if ( band->second.empty() )
continue;
std::shared_ptr<DatasetGroup> group = std::make_shared< DatasetGroup >(
name(),
mMesh.get(),
mFileName,
band->first
);
group->setDataLocation( MDAL_DataLocation::DataOnVertices );
bool is_vector = ( band->second.begin()->second.size() > 1 );
group->setIsScalar( !is_vector );
for ( timestep_map::const_iterator time_step = band->second.begin(); time_step != band->second.end(); time_step++ )
{
std::vector<GDALRasterBandH> raster_bands = time_step->second;
std::shared_ptr<MDAL::MemoryDataset2D> dataset = std::make_shared< MDAL::MemoryDataset2D >( group.get(), true );
dataset->setTime( time_step->first );
for ( std::vector<GDALRasterBandH>::size_type i = 0; i < raster_bands.size(); ++i )
{
addDataToOutput( raster_bands[i], dataset, is_vector, i == 0 );
}
dataset->activateFaces( mMesh.get() );
dataset->setStatistics( MDAL::calculateStatistics( dataset ) );
group->datasets.push_back( dataset );
}
// TODO use GDALComputeRasterMinMax
group->setStatistics( MDAL::calculateStatistics( group ) );
group->setReferenceTime( referenceTime() );
mMesh->datasetGroups.push_back( group );
}
}
void MDAL::DriverGdal::createMesh()
{
Vertices vertices( meshGDALDataset()->mNPoints );
bool is_longitude_shifted = initVertices( vertices );
Faces faces( meshGDALDataset()->mNVolumes );
initFaces( vertices, faces, is_longitude_shifted );
mMesh.reset( new MemoryMesh(
name(),
4, //maximum quads
mFileName
)
);
mMesh->setVertices( std::move( vertices ) );
mMesh->setFaces( std::move( faces ) );
bool proj_added = addSrcProj();
if ( ( !proj_added ) && is_longitude_shifted )
{
std::string wgs84( "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" );
mMesh->setSourceCrs( wgs84 );
}
}
bool MDAL::DriverGdal::addSrcProj()
{
std::string proj = meshGDALDataset()->mProj;
if ( !proj.empty() )
{
mMesh->setSourceCrsFromWKT( proj );
return true;
}
return false;
}
std::vector<std::string> MDAL::DriverGdal::parseDatasetNames( const std::string &fileName )
{
std::string gdal_name = GDALFileName( fileName );
std::vector<std::string> ret;
GDALDatasetH hDataset = GDALOpen( gdal_name.data(), GA_ReadOnly );
if ( hDataset == nullptr ) throw MDAL::Error( MDAL_Status::Err_UnknownFormat, "Unable to open dataset " + gdal_name );
metadata_hash metadata = parseMetadata( hDataset, "SUBDATASETS" );
for ( auto iter = metadata.begin(); iter != metadata.end(); ++iter )
{
const std::string &key = iter->first;
if ( MDAL::endsWith( key, "_name" ) )
{
// skip subdataset desc keys, just register names
ret.push_back( iter->second );
}
}
// there are no GDAL subdatasets
if ( ret.empty() )
{
ret.push_back( gdal_name );
}
GDALClose( hDataset );
return ret;
}
void MDAL::DriverGdal::registerDriver()
{
// re-register all
GDALAllRegister();
// check that our driver exists
GDALDriverH hDriver = GDALGetDriverByName( mGdalDriverName.data() );
if ( !hDriver ) throw MDAL::Error( MDAL_Status::Err_MissingDriver, "No such driver with name " + mGdalDriverName );
}
const MDAL::GdalDataset *MDAL::DriverGdal::meshGDALDataset()
{
assert( gdal_datasets.size() > 0 );
return gdal_datasets[0].get();
}
MDAL::DriverGdal::DriverGdal( const std::string &name,
const std::string &description,
const std::string &filter,
const std::string &gdalDriverName ):
Driver( name, description, filter, Capability::ReadMesh ),
mGdalDriverName( gdalDriverName ),
mPafScanline( nullptr )
{}
bool MDAL::DriverGdal::canReadMesh( const std::string &uri )
{
try
{
registerDriver();
parseDatasetNames( uri );
if ( !MDAL::contains( filters(), MDAL::fileExtension( uri ) ) )
return false;
}
catch ( MDAL_Status )
{
return false;
}
catch ( MDAL::Error )
{
return false;
}
return true;
}
std::unique_ptr<MDAL::Mesh> MDAL::DriverGdal::load( const std::string &fileName, const std::string & )
{
mFileName = fileName;
MDAL::Log::resetLastStatus();
mPafScanline = nullptr;
mMesh.reset();
try
{
registerDriver();
// some formats like NETCFD has data stored in subdatasets
std::vector<std::string> subdatasets = parseDatasetNames( mFileName );
// Parse all the dataset
// For consistency, search the first dataset with a projection and store it first to use it as reference for the mesh
// store other dataset in a std::vector
std::vector<std::shared_ptr<MDAL::GdalDataset>> datasets;
bool firstProjFound = false;
for ( auto iter = subdatasets.begin(); iter != subdatasets.end(); ++iter )
{
std::string gdal_dataset_name = *iter;
// Parse dataset parameters and projection
std::shared_ptr<MDAL::GdalDataset> cfGDALDataset = std::make_shared<MDAL::GdalDataset>();
cfGDALDataset->init( gdal_dataset_name );
if ( !firstProjFound && !cfGDALDataset->mProj.empty() )
{
firstProjFound = true;
gdal_datasets.push_back( cfGDALDataset );
}
else
{
datasets.push_back( cfGDALDataset );
}
}
for ( std::shared_ptr<MDAL::GdalDataset> ds : datasets )
if ( gdal_datasets.empty() || meshes_equals( meshGDALDataset(), ds.get() ) )
gdal_datasets.push_back( ds );
// Construct the mesh with the first dataset
if ( !gdal_datasets.empty() )
{
std::shared_ptr<MDAL::GdalDataset> meshDataset = gdal_datasets.at( 0 );
// Init memory for data reader
mPafScanline = new double [meshDataset->mXSize];
// Create mMesh
createMesh();
}
// parse all datasets
for ( auto iter = gdal_datasets.begin(); iter != gdal_datasets.end(); ++iter )
{
std::shared_ptr<MDAL::GdalDataset> cfGDALDataset = std::make_shared<MDAL::GdalDataset>();
parseRasterBands( iter->get() );
}
// Fix consistency of groups
// It can happen that we thought that the
// group is vector based on name, but it could be just coicidence
// or clash in naming
fixRasterBands();
// Create MDAL datasets
addDatasetGroups();
}
catch ( MDAL_Status error )
{
MDAL::Log::error( error, name(), "error occurred while loading " + fileName );
mMesh.reset();
}
catch ( MDAL::Error err )
{
MDAL::Log::error( err, name() );
mMesh.reset();
}
gdal_datasets.clear();
if ( mPafScanline ) delete[] mPafScanline;
// do not allow mesh without any valid datasets
if ( mMesh && ( mMesh->datasetGroups.empty() ) )
{
MDAL::Log::error( MDAL_Status::Err_InvalidData, name(), "Mesh does not have any valid dataset" );
mMesh.reset();
}
return std::unique_ptr<Mesh>( mMesh.release() );
}
void MDAL::DriverGdal::parseBandIsVector( std::string &band_name, bool *is_vector, bool *is_x )
{
band_name = MDAL::trim( band_name );
if ( MDAL::startsWith( band_name, "u-", MDAL::CaseInsensitive ) ||
MDAL::startsWith( band_name, "x-", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "u-component", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "u component", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "U wind component", MDAL::CaseInsensitive ) ||
MDAL::startsWith( band_name, "Northward", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "x-component", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "x component", MDAL::CaseInsensitive ) )
{
*is_vector = true; // vector
*is_x = true; //X-Axis
}
else if ( MDAL::startsWith( band_name, "v-", MDAL::CaseInsensitive ) ||
MDAL::startsWith( band_name, "y-", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "v-component", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "v component", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "V wind component", MDAL::CaseInsensitive ) ||
MDAL::startsWith( band_name, "Eastward", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "y-component", MDAL::CaseInsensitive ) ||
MDAL::contains( band_name, "y component", MDAL::CaseInsensitive ) )
{
*is_vector = true; // vector
*is_x = false; //Y-Axis
}
else
{
*is_vector = false; // scalar
*is_x = true; //X-Axis
}
if ( *is_vector )
{
band_name = MDAL::replace( band_name, "u-component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "v-component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "U wind component", "wind", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "V wind component", "wind", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "Northward", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "Eastward", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "x-component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "y-component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "u-component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "v-component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "x-component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "y-component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "u component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "v component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "x component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "y component of", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "u component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "v component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "x component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "y component", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "u-", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "v-", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "x-", "", MDAL::CaseInsensitive );
band_name = MDAL::replace( band_name, "y-", "", MDAL::CaseInsensitive );
band_name = MDAL::trim( band_name );
}
}