PostGIS  3.0.6dev-r@@SVN_REVISION@@

◆ rt_raster_to_gdal_mem()

GDALDatasetH rt_raster_to_gdal_mem ( rt_raster  raster,
const char *  srs,
uint32_t *  bandNums,
int *  excludeNodataValues,
int  count,
GDALDriverH *  rtn_drv,
int *  destroy_rtn_drv 
)

Return GDAL dataset using GDAL MEM driver from raster.

Parameters
raster: raster to convert to GDAL MEM
srs: the raster's coordinate system in OGC WKT
bandNums: array of band numbers to extract from raster and include in the GDAL dataset (0 based)
excludeNodataValues: array of zero, nonzero where if non-zero, ignore nodata values for the band to check for pixels with value
count: number of elements in bandNums and exclude_nodata_values
rtn_drv: is set to the GDAL driver object
destroy_rtn_drv: if non-zero, caller must destroy the MEM driver
Returns
GDAL dataset using GDAL MEM driver
Parameters
raster: raster to convert to GDAL MEM
srs: the raster's coordinate system in OGC WKT
bandNums: array of band numbers to extract from raster and include in the GDAL dataset (0 based)
excludeNodataValues: array of zero, nonzero where if non-zero, ignore nodata values for the band
count: number of elements in bandNums
rtn_drv: is set to the GDAL driver object
destroy_rtn_drv: if non-zero, caller must destroy the MEM driver
Returns
GDAL dataset using GDAL MEM driver

Definition at line 1821 of file rt_raster.c.

1828  {
1829  GDALDriverH drv = NULL;
1830  GDALDatasetH ds = NULL;
1831  double gt[6] = {0.0};
1832  CPLErr cplerr;
1833  GDALDataType gdal_pt = GDT_Unknown;
1834  GDALRasterBandH band;
1835  void *pVoid;
1836  char *pszDataPointer;
1837  char szGDALOption[50];
1838  char *apszOptions[4];
1839  double nodata = 0.0;
1840  int allocBandNums = 0;
1841  int allocNodataValues = 0;
1842 
1843  int i;
1844  uint32_t numBands;
1845  uint32_t width = 0;
1846  uint32_t height = 0;
1847  rt_band rtband = NULL;
1848  rt_pixtype pt = PT_END;
1849 
1850  assert(NULL != raster);
1851  assert(NULL != rtn_drv);
1852  assert(NULL != destroy_rtn_drv);
1853 
1854  *destroy_rtn_drv = 0;
1855 
1856  /* store raster in GDAL MEM raster */
1857  if (!rt_util_gdal_driver_registered("MEM")) {
1858  RASTER_DEBUG(4, "Registering MEM driver");
1859  GDALRegister_MEM();
1860  *destroy_rtn_drv = 1;
1861  }
1862  drv = GDALGetDriverByName("MEM");
1863  if (NULL == drv) {
1864  rterror("rt_raster_to_gdal_mem: Could not load the MEM GDAL driver");
1865  return 0;
1866  }
1867  *rtn_drv = drv;
1868 
1869  /* unload driver from GDAL driver manager */
1870  if (*destroy_rtn_drv) {
1871  RASTER_DEBUG(4, "Deregistering MEM driver");
1872  GDALDeregisterDriver(drv);
1873  }
1874 
1875  width = rt_raster_get_width(raster);
1876  height = rt_raster_get_height(raster);
1877  ds = GDALCreate(
1878  drv, "",
1879  width, height,
1880  0, GDT_Byte, NULL
1881  );
1882  if (NULL == ds) {
1883  rterror("rt_raster_to_gdal_mem: Could not create a GDALDataset to convert into");
1884  return 0;
1885  }
1886 
1887  /* add geotransform */
1888  rt_raster_get_geotransform_matrix(raster, gt);
1889  cplerr = GDALSetGeoTransform(ds, gt);
1890  if (cplerr != CE_None) {
1891  rterror("rt_raster_to_gdal_mem: Could not set geotransformation");
1892  GDALClose(ds);
1893  return 0;
1894  }
1895 
1896  /* set spatial reference */
1897  if (NULL != srs && strlen(srs)) {
1898  char *_srs = rt_util_gdal_convert_sr(srs, 0);
1899  if (_srs == NULL) {
1900  rterror("rt_raster_to_gdal_mem: Could not convert srs to GDAL accepted format");
1901  GDALClose(ds);
1902  return 0;
1903  }
1904 
1905  cplerr = GDALSetProjection(ds, _srs);
1906  CPLFree(_srs);
1907  if (cplerr != CE_None) {
1908  rterror("rt_raster_to_gdal_mem: Could not set projection");
1909  GDALClose(ds);
1910  return 0;
1911  }
1912  RASTER_DEBUGF(3, "Projection set to: %s", GDALGetProjectionRef(ds));
1913  }
1914 
1915  /* process bandNums */
1916  numBands = rt_raster_get_num_bands(raster);
1917  if (NULL != bandNums && count > 0) {
1918  for (i = 0; i < count; i++) {
1919  if (bandNums[i] >= numBands) {
1920  rterror("rt_raster_to_gdal_mem: The band index %d is invalid", bandNums[i]);
1921  GDALClose(ds);
1922  return 0;
1923  }
1924  }
1925  }
1926  else {
1927  count = numBands;
1928  bandNums = (uint32_t *) rtalloc(sizeof(uint32_t) * count);
1929  if (NULL == bandNums) {
1930  rterror("rt_raster_to_gdal_mem: Could not allocate memory for band indices");
1931  GDALClose(ds);
1932  return 0;
1933  }
1934  allocBandNums = 1;
1935  for (i = 0; i < count; i++) bandNums[i] = i;
1936  }
1937 
1938  /* process exclude_nodata_values */
1939  if (NULL == excludeNodataValues) {
1940  excludeNodataValues = (int *) rtalloc(sizeof(int) * count);
1941  if (NULL == excludeNodataValues) {
1942  rterror("rt_raster_to_gdal_mem: Could not allocate memory for NODATA flags");
1943  GDALClose(ds);
1944  return 0;
1945  }
1946  allocNodataValues = 1;
1947  for (i = 0; i < count; i++) excludeNodataValues[i] = 1;
1948  }
1949 
1950  /* add band(s) */
1951  for (i = 0; i < count; i++) {
1952  rtband = rt_raster_get_band(raster, bandNums[i]);
1953  if (NULL == rtband) {
1954  rterror("rt_raster_to_gdal_mem: Could not get requested band index %d", bandNums[i]);
1955  if (allocBandNums) rtdealloc(bandNums);
1956  if (allocNodataValues) rtdealloc(excludeNodataValues);
1957  GDALClose(ds);
1958  return 0;
1959  }
1960 
1961  pt = rt_band_get_pixtype(rtband);
1962  gdal_pt = rt_util_pixtype_to_gdal_datatype(pt);
1963  if (gdal_pt == GDT_Unknown)
1964  rtwarn("rt_raster_to_gdal_mem: Unknown pixel type for band");
1965 
1966  /*
1967  For all pixel types other than PT_8BSI, set pointer to start of data
1968  */
1969  if (pt != PT_8BSI) {
1970  pVoid = rt_band_get_data(rtband);
1971  RASTER_DEBUGF(4, "Band data is at pos %p", pVoid);
1972 
1973  pszDataPointer = (char *) rtalloc(20 * sizeof (char));
1974  sprintf(pszDataPointer, "%p", pVoid);
1975  RASTER_DEBUGF(4, "rt_raster_to_gdal_mem: szDatapointer is %p",
1976  pszDataPointer);
1977 
1978  if (strncasecmp(pszDataPointer, "0x", 2) == 0)
1979  sprintf(szGDALOption, "DATAPOINTER=%s", pszDataPointer);
1980  else
1981  sprintf(szGDALOption, "DATAPOINTER=0x%s", pszDataPointer);
1982 
1983  RASTER_DEBUG(3, "Storing info for GDAL MEM raster band");
1984 
1985  apszOptions[0] = szGDALOption;
1986  apszOptions[1] = NULL; /* pixel offset, not needed */
1987  apszOptions[2] = NULL; /* line offset, not needed */
1988  apszOptions[3] = NULL;
1989 
1990  /* free */
1991  rtdealloc(pszDataPointer);
1992 
1993  /* add band */
1994  if (GDALAddBand(ds, gdal_pt, apszOptions) == CE_Failure) {
1995  rterror("rt_raster_to_gdal_mem: Could not add GDAL raster band");
1996  if (allocBandNums) rtdealloc(bandNums);
1997  GDALClose(ds);
1998  return 0;
1999  }
2000  }
2001  /*
2002  PT_8BSI is special as GDAL has no equivalent pixel type.
2003  Must convert 8BSI to 16BSI so create basic band
2004  */
2005  else {
2006  /* add band */
2007  if (GDALAddBand(ds, gdal_pt, NULL) == CE_Failure) {
2008  rterror("rt_raster_to_gdal_mem: Could not add GDAL raster band");
2009  if (allocBandNums) rtdealloc(bandNums);
2010  if (allocNodataValues) rtdealloc(excludeNodataValues);
2011  GDALClose(ds);
2012  return 0;
2013  }
2014  }
2015 
2016  /* check band count */
2017  if (GDALGetRasterCount(ds) != i + 1) {
2018  rterror("rt_raster_to_gdal_mem: Error creating GDAL MEM raster band");
2019  if (allocBandNums) rtdealloc(bandNums);
2020  if (allocNodataValues) rtdealloc(excludeNodataValues);
2021  GDALClose(ds);
2022  return 0;
2023  }
2024 
2025  /* get new band */
2026  band = NULL;
2027  band = GDALGetRasterBand(ds, i + 1);
2028  if (NULL == band) {
2029  rterror("rt_raster_to_gdal_mem: Could not get GDAL band for additional processing");
2030  if (allocBandNums) rtdealloc(bandNums);
2031  if (allocNodataValues) rtdealloc(excludeNodataValues);
2032  GDALClose(ds);
2033  return 0;
2034  }
2035 
2036  /* PT_8BSI requires manual setting of pixels */
2037  if (pt == PT_8BSI) {
2038  uint32_t nXBlocks, nYBlocks;
2039  int nXBlockSize, nYBlockSize;
2040  uint32_t iXBlock, iYBlock;
2041  int nXValid, nYValid;
2042  int iX, iY;
2043  int iXMax, iYMax;
2044 
2045  int x, y, z;
2046  uint32_t valueslen = 0;
2047  int16_t *values = NULL;
2048  double value = 0.;
2049 
2050  /* this makes use of GDAL's "natural" blocks */
2051  GDALGetBlockSize(band, &nXBlockSize, &nYBlockSize);
2052  nXBlocks = (width + nXBlockSize - 1) / nXBlockSize;
2053  nYBlocks = (height + nYBlockSize - 1) / nYBlockSize;
2054  RASTER_DEBUGF(4, "(nXBlockSize, nYBlockSize) = (%d, %d)", nXBlockSize, nYBlockSize);
2055  RASTER_DEBUGF(4, "(nXBlocks, nYBlocks) = (%d, %d)", nXBlocks, nYBlocks);
2056 
2057  /* length is for the desired pixel type */
2058  valueslen = rt_pixtype_size(PT_16BSI) * nXBlockSize * nYBlockSize;
2059  values = rtalloc(valueslen);
2060  if (NULL == values) {
2061  rterror("rt_raster_to_gdal_mem: Could not allocate memory for GDAL band pixel values");
2062  if (allocBandNums) rtdealloc(bandNums);
2063  if (allocNodataValues) rtdealloc(excludeNodataValues);
2064  GDALClose(ds);
2065  return 0;
2066  }
2067 
2068  for (iYBlock = 0; iYBlock < nYBlocks; iYBlock++) {
2069  for (iXBlock = 0; iXBlock < nXBlocks; iXBlock++) {
2070  memset(values, 0, valueslen);
2071 
2072  x = iXBlock * nXBlockSize;
2073  y = iYBlock * nYBlockSize;
2074  RASTER_DEBUGF(4, "(iXBlock, iYBlock) = (%d, %d)", iXBlock, iYBlock);
2075  RASTER_DEBUGF(4, "(x, y) = (%d, %d)", x, y);
2076 
2077  /* valid block width */
2078  if ((iXBlock + 1) * nXBlockSize > width)
2079  nXValid = width - (iXBlock * nXBlockSize);
2080  else
2081  nXValid = nXBlockSize;
2082 
2083  /* valid block height */
2084  if ((iYBlock + 1) * nYBlockSize > height)
2085  nYValid = height - (iYBlock * nYBlockSize);
2086  else
2087  nYValid = nYBlockSize;
2088 
2089  RASTER_DEBUGF(4, "(nXValid, nYValid) = (%d, %d)", nXValid, nYValid);
2090 
2091  /* convert 8BSI values to 16BSI */
2092  z = 0;
2093  iYMax = y + nYValid;
2094  iXMax = x + nXValid;
2095  for (iY = y; iY < iYMax; iY++) {
2096  for (iX = x; iX < iXMax; iX++) {
2097  if (rt_band_get_pixel(rtband, iX, iY, &value, NULL) != ES_NONE) {
2098  rterror("rt_raster_to_gdal_mem: Could not get pixel value to convert from 8BSI to 16BSI");
2099  rtdealloc(values);
2100  if (allocBandNums) rtdealloc(bandNums);
2101  if (allocNodataValues) rtdealloc(excludeNodataValues);
2102  GDALClose(ds);
2103  return 0;
2104  }
2105 
2106  values[z++] = rt_util_clamp_to_16BSI(value);
2107  }
2108  }
2109 
2110  /* burn values */
2111  if (GDALRasterIO(
2112  band, GF_Write,
2113  x, y,
2114  nXValid, nYValid,
2115  values, nXValid, nYValid,
2116  gdal_pt,
2117  0, 0
2118  ) != CE_None) {
2119  rterror("rt_raster_to_gdal_mem: Could not write converted 8BSI to 16BSI values to GDAL band");
2120  rtdealloc(values);
2121  if (allocBandNums) rtdealloc(bandNums);
2122  if (allocNodataValues) rtdealloc(excludeNodataValues);
2123  GDALClose(ds);
2124  return 0;
2125  }
2126  }
2127  }
2128 
2129  rtdealloc(values);
2130  }
2131 
2132  /* Add nodata value for band */
2133  if (rt_band_get_hasnodata_flag(rtband) != FALSE && excludeNodataValues[i]) {
2134  rt_band_get_nodata(rtband, &nodata);
2135  if (GDALSetRasterNoDataValue(band, nodata) != CE_None)
2136  rtwarn("rt_raster_to_gdal_mem: Could not set nodata value for band");
2137  RASTER_DEBUGF(3, "nodata value set to %f", GDALGetRasterNoDataValue(band, NULL));
2138  }
2139 
2140 #if POSTGIS_DEBUG_LEVEL > 3
2141  {
2142  GDALRasterBandH _grb = NULL;
2143  double _min;
2144  double _max;
2145  double _mean;
2146  double _stddev;
2147 
2148  _grb = GDALGetRasterBand(ds, i + 1);
2149  GDALComputeRasterStatistics(_grb, FALSE, &_min, &_max, &_mean, &_stddev, NULL, NULL);
2150  RASTER_DEBUGF(4, "GDAL Band %d stats: %f, %f, %f, %f", i + 1, _min, _max, _mean, _stddev);
2151  }
2152 #endif
2153 
2154  }
2155 
2156  /* necessary??? */
2157  GDALFlushCache(ds);
2158 
2159  if (allocBandNums) rtdealloc(bandNums);
2160  if (allocNodataValues) rtdealloc(excludeNodataValues);
2161 
2162  return ds;
2163 }
FALSE
#define FALSE
Definition: dbfopen.c:168
rterror
void rterror(const char *fmt,...)
Wrappers used for reporting errors and info.
Definition: rt_context.c:199
rtalloc
void * rtalloc(size_t size)
Wrappers used for managing memory.
Definition: rt_context.c:171
RASTER_DEBUG
#define RASTER_DEBUG(level, msg)
Definition: librtcore.h:295
RASTER_DEBUGF
#define RASTER_DEBUGF(level, msg,...)
Definition: librtcore.h:299
rt_util_gdal_convert_sr
char * rt_util_gdal_convert_sr(const char *srs, int proj4)
Definition: rt_util.c:214
rt_band_get_hasnodata_flag
int rt_band_get_hasnodata_flag(rt_band band)
Get hasnodata flag value.
Definition: rt_band.c:674
rt_band_get_pixel
rt_errorstate rt_band_get_pixel(rt_band band, int x, int y, double *value, int *nodata)
Get pixel value.
Definition: rt_band.c:1221
rt_pixtype
rt_pixtype
Definition: librtcore.h:185
PT_END
@ PT_END
Definition: librtcore.h:197
PT_8BSI
@ PT_8BSI
Definition: librtcore.h:189
PT_16BSI
@ PT_16BSI
Definition: librtcore.h:191
rt_util_pixtype_to_gdal_datatype
GDALDataType rt_util_pixtype_to_gdal_datatype(rt_pixtype pt)
Convert rt_pixtype to GDALDataType.
Definition: rt_util.c:120
rtwarn
void rtwarn(const char *fmt,...)
Definition: rt_context.c:224
ES_NONE
@ ES_NONE
Definition: librtcore.h:180
rt_util_clamp_to_16BSI
int16_t rt_util_clamp_to_16BSI(double value)
Definition: rt_util.c:59
rt_util_gdal_driver_registered
int rt_util_gdal_driver_registered(const char *drv)
Definition: rt_util.c:357
rt_band_get_nodata
rt_errorstate rt_band_get_nodata(rt_band band, double *nodata)
Get NODATA value.
Definition: rt_band.c:1730
rt_band_get_pixtype
rt_pixtype rt_band_get_pixtype(rt_band band)
Return pixeltype of this band.
Definition: rt_band.c:631
rtdealloc
void rtdealloc(void *mem)
Definition: rt_context.c:186
rt_band_get_data
void * rt_band_get_data(rt_band band)
Get pointer to raster band data.
Definition: rt_band.c:400
rt_pixtype_size
int rt_pixtype_size(rt_pixtype pixtype)
Return size in bytes of a value in the given pixtype.
Definition: rt_pixel.c:39
genraster.value
int value
Definition: genraster.py:62
genraster.count
int count
Definition: genraster.py:57
ovdump.band
band
Definition: ovdump.py:58
pixval.ds
ds
Definition: pixval.py:67
rtrowdump.raster
raster
Be careful!! Zeros function's input parameter can be a (height x width) array, not (width x height): ...
Definition: rtrowdump.py:121
window.gt
gt
Definition: window.py:78
rt_raster_get_num_bands
uint16_t rt_raster_get_num_bands(rt_raster raster)
Definition: rt_raster.c:372
rt_raster_get_height
uint16_t rt_raster_get_height(rt_raster raster)
Definition: rt_raster.c:129
rt_raster_get_band
rt_band rt_raster_get_band(rt_raster raster, int n)
Return Nth band, or NULL if unavailable.
Definition: rt_raster.c:381
rt_raster_get_width
uint16_t rt_raster_get_width(rt_raster raster)
Definition: rt_raster.c:121
rt_raster_get_geotransform_matrix
void rt_raster_get_geotransform_matrix(rt_raster raster, double *gt)
Get 6-element array of raster geotransform matrix.
Definition: rt_raster.c:706
rt_band_t
Definition: librtcore.h:2314

References ovdump::band, genraster::count, pixval::ds, ES_NONE, FALSE, window::gt, PT_16BSI, PT_8BSI, PT_END, rtrowdump::raster, RASTER_DEBUG, RASTER_DEBUGF, rt_band_get_data(), rt_band_get_hasnodata_flag(), rt_band_get_nodata(), rt_band_get_pixel(), rt_band_get_pixtype(), rt_pixtype_size(), rt_raster_get_band(), rt_raster_get_geotransform_matrix(), rt_raster_get_height(), rt_raster_get_num_bands(), rt_raster_get_width(), rt_util_clamp_to_16BSI(), rt_util_gdal_convert_sr(), rt_util_gdal_driver_registered(), rt_util_pixtype_to_gdal_datatype(), rtalloc(), rtdealloc(), rterror(), rtwarn(), genraster::value, pixval::x, and pixval::y.

Referenced by rt_raster_gdal_polygonize(), rt_raster_gdal_warp(), rt_raster_to_gdal(), and test_gdal_to_raster().

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