Hi
now I am using following c++ commands to read pages from
multisubdatasets Geotiff file :
dataset =
static_cast<GDALDataset*>(GDALOpen(TiffFullName.c_str(), GA_ReadOnly));
if (dataset == NULL) {
std::cout << "Failed to open subdataset nr = " << subsets
<< " Read command = " << TiffFullName << std::endl;
break;
}
else
std::cout << "Subdataset readed = " << subsets << " Read
command = " << TiffFullName << std::endl;
And getting following result :
Subdataset readed = 1 Read command =
GTIFF_DIR:1:F:\3D-data\GeoTIFFs\autzen.1.tiff
ERROR 4: F:\3D-data\GeoTIFFs\autzen.1.tiff: Requested directory 2 not found.
Failed to open subdataset nr = 2 Read command =
GTIFF_DIR:2:F:\3D-data\GeoTIFFs\autzen.1.tiff
Does this command works properly and how I can get information about
subdatasets in GeoTiff file
Regards
Raivo
On 08.03.23 14:54, Raivo Rebane wrote:
Hi
I found from documentation following about subdataset:
Subdatasets
<https://gdal.org/drivers/raster/gtiff.html#subdatasets>
Multi-page TIFF files are exposed as subdatasets. On opening, a
subdataset name is GTIFF_DIR:{index}:filename.tif, where {index}
starts at 1.
I am using following code :
GDALDataset* subdataset =
static_cast<GDALDataset*>(GDALOpen("F:\\3D-data\\GeoTIFFs\\[1]:44744.tif",
GA_ReadOnly));
if (subdataset == NULL) {
std::cout << "Failed to open subdataset!" << std::endl;
return 1;
}
But geting following :
subdataset = NULL
From documentation I didn't find more
In what I am wrong
Regards
Raivo
On 08.03.23 01:01, Brad Hards wrote:
On Wednesday, 8 March 2023 6:53:17 AM AEDT Raivo Rebane wrote:
I studied and asked fromhttps://chat.openai.com/chat how to read
multiband raster image, but I did'nt find anywhere how to rread from
tiff file next frame or ortofo bands
Please ask me if it's possible
It is possible. Seehttps://gdal.org/drivers/raster/gtiff.html#subdatasets for
how the multiple images are identified.
Use gdalinfo on your file to see the specific characteristics.
Seehttps://gdal.org/tutorials/raster_api_tut.html for use of the Raster API
abstraction.
So you just need to pass the correct name to the open call.
Brad
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