Exports a raster object to Object Storage Service (OSS), Multi-Cloud Object Storage (MinIO), or Hadoop Distributed File System (HDFS).
Syntax
boolean ST_ExportTo(raster source,
cstring format,
cstring url,
integer level = 0);Parameters
| Parameter | Description |
|---|---|
| source | The raster object to export. |
| format | The output format. Common values include GTiff and BMP. For the full list of supported formats, see Supported formats. |
| url | The destination URL for the exported OSS object, MinIO object, or HDFS file. Subset URLs are not supported. For URL syntax, see Object storage paths. |
| level | The pyramid level. Default value: 0. |
Supported formats
The following table lists common formats.
| Format | Full name |
|---|---|
| BMP | Microsoft Windows Device Independent Bitmap (.bmp) |
| ECW | ERDAS Compressed Wavelets (.ecw) |
| EHdr | ESRI .hdr Labelled |
| GIF | Graphics Interchange Format (.gif) |
| GPKG | GeoPackage |
| GTiff | TIFF/BigTIFF/GeoTIFF (.tif) |
| HDF4 | Hierarchical Data Format Release 4 (HDF4) |
| Geospatial PDF | |
| PNG | Portable Network Graphics (.png) |
| COG | Cloud optimized GeoTIFF |
To get the complete list of supported formats, call ST_RasterDrivers.
Return value
Returns true if the export succeeds, or false if it fails.
Examples
-- Export a raster object as an OSS object.
Select ST_ExportTo(raster, 'GTiff', 'OSS://<ak>:<ak_secret>@oss-cn-beijing-internal.aliyuncs.com/mybucket/data/image.tif')
from raster_table
where id=1;
-- Export a raster object as a MinIO object.
Select ST_ExportTo(raster, 'PNG', 'MIO://<ak>:<ak_secret>@10.0.XX.XX:443/mybucket/data/image.png')
from raster_table
where id=1;
-- Export a raster object as an HDFS file.
Select ST_ExportTo(raster, 'PNG', 'HDFS://<user_name>@10.0.XX.XX:8020/path/image.png')
from raster_table
where id=1;