ST_Raster.describe
Definition
ST_Raster.describe provides the property list of an ST_Raster object. Optional input parameters include either storage, which directs the describe function to display the storage size of each band by pyramid level, or color map, which indicates that the describe function should list the color map index if one exists. The describe function has been designed to operate exclusively as part of the select list of a SQL SELECT statement.
Syntax
Oracle
describe () RETURN CLOB describe (parameter IN VARCHAR2) RETURN CLOB
PostgreSQL
describe (raster IN ST_RASTER) RETURN TEXT
describe (raster IN ST_RASTER,
parameter IN TEXT) RETURN TEXT
SQL Server
describe (parameter IN NVARCHAR) RETURN NVARCHAR
Returns
CLOB
Parameters
If a parameter is not provide, the describe function displays basic properties of the ST_Raster object.
Parameter | Description |
|---|---|
storage | Directs the describe function to list the actual compressed storage displacement for each band and pyramid level of the color-mapped ST_Raster object |
colormap | Directs the describe function to list the color map index of the color-mapped ST_Raster object |
Examples
These examples demonstrate the following:
- The first example is a SELECT statement and provides a list of ST_Raster properties from the ST_Raster.describe() function.
- The next example illustrates the use of the storage parameter with the ST_Raster.describe() function.
- The last example shows you how to return the raster color map information.
Oracle
-
SELECT image.describe() FROM NOVA; Raster ID ...................: 2 Raster Column ID ............: 268 Raster Dimension ............: 6000, 6000, 1 Raster Tile Dimension .......: 128, 128 Pixel Type ..................: int16 Compression .................: lz77 Image Pyramid ...............: 6, bilinear Extent ......................: <NONE> Statistics ..................: min : 4271.0000000000 max : 6751.0000000000 mean : 5024.6673817222 std dev : 272.5172958117
-
SELECT image.describe('storage') FROM NOVA; Raster Tile Storage .........: min max mean std dev count total Level 0: Band 1 61 23802 16818.32 3681.83 2209 36,281 KB Level 1: Band 1 2506 24028 17958.37 3836.54 576 10,102 KB Level 2: Band 1 6786 23245 19566.38 2732.57 144 2,752 KB Level 3: Band 1 16547 23232 20919.81 1736.37 36 735 KB Level 4: Band 1 19764 23620 21993.11 1271.31 9 193 KB Level 5: Band 1 5854 23853 13186.50 7596.00 4 52 KB Level 6: Band 1 13563 13563 13563.00 0.00 1 13 KB 50,128 KB 51,330,596 bytes Compression Ratio ...........: 1.40267 -
SELECT image.describe('colormap') FROM NOVA WHERE image.raster_id = 1; Raster ID ...................: 1 Raster Column ID ............: 329 Raster Dimension ............: 512, 512, 1 Raster Tile Dimension .......: 128, 128 Pixel Type ..................: uint8 Compression .................: lz77 Image Pyramid ...............: <NONE> Extent ......................: <NONE> Colormap ....................: rgb, uint16, 256 index red green blue 0 14906 0 0 1 8738 0 0 2 5654 0 0 3 2570 0 0 4 27242 23901 31868 5 51143 50886 51400 6 19018 13878 23644 7 6168 2056 6168 8 55512 51400 55512 9 63736 59624 63736 10 60138 55512 59624 ... ... ... ... 250 63736 63736 63736 251 59624 59624 59624 252 55512 55512 55512 253 6168 6168 6168 254 2056 2056 2056 255 65535 65535 65535
PostgreSQL
-
SELECT describe(image) FROM nova; Raster ID ...................: 2 Raster Column ID ............: 268 Raster Dimension ............: 6000, 6000, 1 Raster Tile Dimension .......: 128, 128 Pixel Type ..................: int16 Compression .................: lz77 Image Pyramid ...............: 6, bilinear Extent ......................: <NONE> Statistics ..................: min : 4271.0000000000 max : 6751.0000000000 mean : 5024.6673817222 std dev : 272.5172958117
-
SELECT describe(image,'storage') FROM nova; Raster Tile Storage .........: min max mean std dev count total Level 0: Band 1 61 23802 16818.32 3681.83 2209 36,281 KB Level 1: Band 1 2506 24028 17958.37 3836.54 576 10,102 KB Level 2: Band 1 6786 23245 19566.38 2732.57 144 2,752 KB Level 3: Band 1 16547 23232 20919.81 1736.37 36 735 KB Level 4: Band 1 19764 23620 21993.11 1271.31 9 193 KB Level 5: Band 1 5854 23853 13186.50 7596.00 4 52 KB Level 6: Band 1 13563 13563 13563.00 0.00 1 13 KB 50,128 KB 51,330,596 bytes Compression Ratio ...........: 1.40267 -
SELECT describe(image,'colormap') FROM nova WHERE image.raster_id = 1; Raster ID ...................: 1 Raster Column ID ............: 329 Raster Dimension ............: 512, 512, 1 Raster Tile Dimension .......: 128, 128 Pixel Type ..................: uint8 Compression .................: lz77 Image Pyramid ...............: <NONE> Extent ......................: <NONE> Colormap ....................: rgb, uint16, 256 index red green blue 0 14906 0 0 1 8738 0 0 2 5654 0 0 3 2570 0 0 4 27242 23901 31868 5 51143 50886 51400 6 19018 13878 23644 7 6168 2056 6168 8 55512 51400 55512 9 63736 59624 63736 10 60138 55512 59624 ... ... ... ... 250 63736 63736 63736 251 59624 59624 59624 252 55512 55512 55512 253 6168 6168 6168 254 2056 2056 2056 255 65535 65535 65535
SQL Server
-
SELECT image.describe(NULL) FROM nova; Raster ID ...................: 2 Raster Column ID ............: 268 Raster Dimension ............: 6000, 6000, 1 Raster Tile Dimension .......: 128, 128 Pixel Type ..................: int16 Compression .................: lz77 Image Pyramid ...............: 6, bilinear Extent ......................: <NONE> Statistics ..................: min : 4271.0000000000 max : 6751.0000000000 mean : 5024.6673817222 std dev : 272.5172958117
-
SELECT image.describe('storage') FROM nova; Raster Tile Storage .........: min max mean std dev count total Level 0: Band 1 61 23802 16818.32 3681.83 2209 36,281 KB Level 1: Band 1 2506 24028 17958.37 3836.54 576 10,102 KB Level 2: Band 1 6786 23245 19566.38 2732.57 144 2,752 KB Level 3: Band 1 16547 23232 20919.81 1736.37 36 735 KB Level 4: Band 1 19764 23620 21993.11 1271.31 9 193 KB Level 5: Band 1 5854 23853 13186.50 7596.00 4 52 KB Level 6: Band 1 13563 13563 13563.00 0.00 1 13 KB 50,128 KB 51,330,596 bytes Compression Ratio ...........: 1.40267 -
SELECT image.describe('colormap') FROM nova WHERE image.raster_id = 1; Raster ID ...................: 1 Raster Column ID ............: 329 Raster Dimension ............: 512, 512, 1 Raster Tile Dimension .......: 128, 128 Pixel Type ..................: uint8 Compression .................: lz77 Image Pyramid ...............: <NONE> Extent ......................: <NONE> Colormap ....................: rgb, uint16, 256 index red green blue 0 14906 0 0 1 8738 0 0 2 5654 0 0 3 2570 0 0 4 27242 23901 31868 5 51143 50886 51400 6 19018 13878 23644 7 6168 2056 6168 8 55512 51400 55512 9 63736 59624 63736 10 60138 55512 59624 ... ... ... ... 250 63736 63736 63736 251 59624 59624 59624 252 55512 55512 55512 253 6168 6168 6168 254 2056 2056 2056 255 65535 65535 65535
3/6/2012