-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
mdal_gdal.cpp
623 lines (540 loc) · 19 KB
/
mdal_gdal.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
/*
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"
#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_Status::Err_UnknownFormat;
// Now parse it
parseParameters();
parseProj();
}
void MDAL::GdalDataset::parseParameters()
{
mNBands = static_cast<unsigned int>( GDALGetRasterCount( mHDataset ) );
if ( mNBands == 0 ) throw MDAL_Status::Err_InvalidData;
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_Status::Err_InvalidData;
mYSize = static_cast<unsigned int>( GDALGetRasterYSize( mHDataset ) ); //raster height in pixels
if ( mYSize == 0 ) throw MDAL_Status::Err_InvalidData;
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::LoaderGdal::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::LoaderGdal::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::LoaderGdal::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::LoaderGdal::GDALFileName( const std::string &fileName )
{
return fileName;
}
double MDAL::LoaderGdal::parseMetadataTime( const std::string &time_s )
{
std::string time_trimmed = MDAL::trim( time_s );
std::vector<std::string> times = MDAL::split( time_trimmed, " ", MDAL::SkipEmptyParts );
return MDAL::toDouble( times[0] );
}
MDAL::LoaderGdal::metadata_hash MDAL::LoaderGdal::parseMetadata( GDALMajorObjectH gdalObject, const char *pszDomain /* = 0 */ )
{
MDAL::LoaderGdal::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, "=", MDAL::SkipEmptyParts );
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::LoaderGdal::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_Status::Err_InvalidData;
}
// Reference time
metadata_hash global_metadata = parseMetadata( cfGDALDataset->mHDataset );
parseGlobals( global_metadata );
// Get metadata
metadata_hash metadata = parseMetadata( gdalBand );
std::string band_name;
double time = std::numeric_limits<double>::min();
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::LoaderGdal::addDataToOutput( GDALRasterBandH raster_band, std::shared_ptr<MemoryDataset> tos, bool is_vector, bool is_x )
{
assert( raster_band );
double nodata = GDALGetRasterNoDataValue( raster_band, nullptr );
unsigned int mXSize = meshGDALDataset()->mXSize;
unsigned int mYSize = meshGDALDataset()->mYSize;
double *values = tos->values();
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_Status::Err_InvalidData;
}
for ( unsigned int x = 0; x < mXSize; ++x )
{
unsigned int idx = x + mXSize * y;
double val = mPafScanline[x];
if ( !MDAL::equals( val, nodata ) )
{
// values is prepolulated with NODATA values, so store only legal values
if ( is_vector )
{
if ( is_x )
{
values[2 * idx] = val;
}
else
{
values[2 * idx + 1] = val;
}
}
else
{
values[idx] = val;
}
}
}
}
}
void MDAL::LoaderGdal::activateFaces( std::shared_ptr<MemoryDataset> tos )
{
// only for data on vertices
if ( !tos->group()->isOnVertices() )
return;
bool isScalar = tos->group()->isScalar();
// Activate only Faces that do all Vertex's outputs with some data
int *active = tos->active();
const double *values = tos->constValues();
for ( unsigned int idx = 0; idx < meshGDALDataset()->mNVolumes; ++idx )
{
Face elem = mMesh->faces.at( idx );
for ( size_t i = 0; i < 4; ++i )
{
if ( isScalar )
{
double val = values[elem[i]];
if ( std::isnan( val ) )
{
active[idx] = 0; //NOT ACTIVE
break;
}
}
else
{
double x = values[elem[2 * i]];
double y = values[elem[2 * i + 1]];
if ( std::isnan( x ) || std::isnan( y ) )
{
active[idx] = 0; //NOT ACTIVE
break;
}
}
}
}
}
void MDAL::LoaderGdal::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 >(
mMesh.get(),
mFileName,
band->first
);
group->setIsOnVertices( true );
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::MemoryDataset> dataset = std::make_shared< MDAL::MemoryDataset >( group.get() );
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 );
}
activateFaces( dataset );
dataset->setStatistics( MDAL::calculateStatistics( dataset ) );
group->datasets.push_back( dataset );
}
// TODO use GDALComputeRasterMinMax
group->setStatistics( MDAL::calculateStatistics( group ) );
mMesh->datasetGroups.push_back( group );
}
}
void MDAL::LoaderGdal::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(
vertices.size(),
faces.size(),
4, //maximum quads
computeExtent( vertices ),
mFileName
)
);
mMesh->vertices = vertices;
mMesh->faces = 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::LoaderGdal::addSrcProj()
{
std::string proj = meshGDALDataset()->mProj;
if ( !proj.empty() )
{
mMesh->setSourceCrsFromWKT( proj );
return true;
}
return false;
}
std::vector<std::string> MDAL::LoaderGdal::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_Status::Err_UnknownFormat;
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::LoaderGdal::registerDriver()
{
// re-register all
GDALAllRegister();
// check that our driver exists
GDALDriverH hDriver = GDALGetDriverByName( mDriverName.data() );
if ( !hDriver ) throw MDAL_Status::Err_MissingDriver;
}
const MDAL::GdalDataset *MDAL::LoaderGdal::meshGDALDataset()
{
assert( gdal_datasets.size() > 0 );
return gdal_datasets[0];
}
MDAL::LoaderGdal::LoaderGdal( const std::string &fileName, const std::string &driverName ):
mFileName( fileName ),
mDriverName( driverName ),
mPafScanline( nullptr )
{}
std::unique_ptr<MDAL::Mesh> MDAL::LoaderGdal::load( MDAL_Status *status )
{
if ( status ) *status = MDAL_Status::None ;
mPafScanline = nullptr;
mMesh.reset();
try
{
registerDriver();
// some formats like NETCFD has data stored in subdatasets
std::vector<std::string> subdatasets = parseDatasetNames( mFileName );
// First parse ALL datasets/bands to gather vector quantities
// if case they are splitted in different subdatasets
for ( auto iter = subdatasets.begin(); iter != subdatasets.end(); ++iter )
{
std::string gdal_dataset_name = *iter;
// Parse dataset parameters and projection
MDAL::GdalDataset *cfGDALDataset = new MDAL::GdalDataset;
cfGDALDataset->init( gdal_dataset_name );
if ( !mMesh )
{
// If it is first dataset, create mesh from it
gdal_datasets.push_back( cfGDALDataset );
// Init memory for data reader
mPafScanline = new double [cfGDALDataset->mXSize];
// Create mMesh
createMesh();
// Parse bands
parseRasterBands( cfGDALDataset );
}
else if ( meshes_equals( meshGDALDataset(), cfGDALDataset ) )
{
gdal_datasets.push_back( cfGDALDataset );
// Parse bands
parseRasterBands( cfGDALDataset );
}
else
{
// Do not use
delete cfGDALDataset;
}
}
// Create MDAL datasets
addDatasetGroups();
}
catch ( MDAL_Status error )
{
if ( status ) *status = ( error );
mMesh.reset();
}
for ( auto it = gdal_datasets.begin(); it != gdal_datasets.end(); ++it )
{
delete ( *it );
}
gdal_datasets.clear();
if ( mPafScanline ) delete[] mPafScanline;
// do not allow mesh without any valid datasets
if ( mMesh && ( mMesh->datasetGroups.empty() ) )
{
if ( status ) *status = MDAL_Status::Err_InvalidData;
mMesh.reset();
}
return std::unique_ptr<Mesh>( mMesh.release() );
}
void MDAL::LoaderGdal::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::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::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, "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 );
}
}