Errors when trying to mosaic compressed images

Question

I am trying to load georaster data into Oracle 11g 11.2.0.2. I was successful then doing this by using the following steps:-
- SDO_GEOR.IMPORTFROM
- sdo_geor.mosaic
However when I try to compress the images as JPEG-B I get an Oracle error when performing the mosaic operation.
ORA-13485: error occurred during compression or decompression: lossy then something related to colormaps.
Has anyone ever seen a similar error.
These are the scripts.
set serveroutput on size 1000000;
set timing on;
LOAD
-- THE SDO_RASTER TABLE HAS TO BE UNIQUE IN THE ENTIRE DATABASE
DROP TABLE GEO_25K PURGE;
DROP TABLE RDT_25K PURGE;
CREATE TABLE GEO_25K ( ID NUMBER PRIMARY KEY,
     SOURCE_FILE VARCHAR2(80),
     DESCRIPTION VARCHAR2(32),
     GEOMMBR SDO_GEOMETRY,
     GEORASTER SDO_GEORASTER);
CREATE TABLE RDT_25K OF SDO_RASTER
     (PRIMARY KEY (RASTERID, PYRAMIDLEVEL, BANDBLOCKNUMBER, ROWBLOCKNUMBER, COLUMNBLOCKNUMBER))
     LOB(RASTERBLOCK) STORE AS (NOCACHE NOLOGGING);
CALL SDO_GEOR_UTL.CREATEDMLTRIGGER('GEO_25K','GEORASTER');
-- IMPORTFROM DOES NOT SUPPORT JPG ONLY TIFF, GIF, BMP AND PNG
-- SET TIMING ON IN SQLPLUS TO SEE HOW LONG THE LOAD TAKES
-- 28 X JPG CONVERTED TO TIFF REPRESENTS 1.93GB ON DISK AND 2286MB IN THE DB AND TOOK 1 HOUR 11 MINUTES TO LOAD
DECLARE
     TYPE FILE_LIST IS TABLE OF VARCHAR2(200);
     files FILE_LIST;
     geor MDSYS.SDO_GEORASTER;
BEGIN
     dbms_java.set_output(1000000);
     get_dir_list('/PRLR01/fssa01/RASTER/LOAD/');
     FOR i in ( SELECT rownum,FILENAME from dir_list where FILENAME like '%TIF' )
     LOOP
          dbms_output.put_line(i.FILENAME);
          dbms_output.put_line(SUBSTR(i.filename, 1, LENGTH(i.filename)-4) || '.TFW');
          INSERT INTO GEO_25K VALUES (i.rownum, i.filename, '', null, MDSYS.SDO_GEOR.INIT('RDT_25K', i.rownum));
          SELECT GEORASTER INTO geor FROM GEO_25K WHERE ID = i.rownum FOR UPDATE;
          MDSYS.SDO_GEOR.IMPORTFROM(geor, 'compression=JPEG-B', 'TIFF', 'FILE', i.FILENAME,
               'WORLDFILE', 'FILE', SUBSTR(i.filename, 1, LENGTH(i.filename)-4) || '.TFW');
          UPDATE GEO_25K SET GEORASTER = geor WHERE ID = i.rownum;
          SELECT GEORASTER INTO geor FROM GEO_25K WHERE ID = i.rownum FOR UPDATE;
          MDSYS.SDO_GEOR.SETRASTERTYPE(geor, 21001);
          UPDATE GEO_25K SET GEORASTER = geor WHERE ID = i.rownum;
          SELECT georaster INTO geor FROM GEO_25K WHERE id = i.rownum FOR UPDATE;
          sdo_geor.setModelSRID(geor, 81989);
          UPDATE GEO_25K SET georaster = geor WHERE id=i.rownum;
     END LOOP;
     COMMIT;
END;
MOSAIC
set timing on;
--After the GeoRaster are loaded you may want to set the appropriate SRID if this was not set correctly.
--SELECT sdo_geor.validateBlockMBR(georaster), id FROM GEO_25K;
--select id, sdo_geor.getModelSRID(georaster) from GEO_25K;
--Then you need to validate the GeoRasters to see if they have been setup correctly.
--SELECT t.id, sdo_geor.validategeoraster(t.georaster) isvalid from GEO_25K t order by id;
--After you have loaded all the georasters, iSMART will pick up each row of the georaster as an individual layer so you need to create a mosaic layer or table
drop table GEO_MOSAIC_25K;
drop table RDT_MOSAIC_25K;
CREATE TABLE GEO_MOSAIC_25K ( ID NUMBER PRIMARY KEY,
SOURCE_FILE VARCHAR2(80),
DESCRIPTION VARCHAR2(32),
GEOMMBR SDO_GEOMETRY,
GEORASTER SDO_GEORASTER);
CREATE TABLE RDT_MOSAIC_25K OF SDO_RASTER
(PRIMARY KEY (RASTERID, PYRAMIDLEVEL, BANDBLOCKNUMBER, ROWBLOCKNUMBER, COLUMNBLOCKNUMBER))
LOB(RASTERBLOCK) STORE AS (NOCACHE NOLOGGING);
call sdo_geor_utl.createDMLTrigger('GEO_MOSAIC_25K','GEORASTER');
DECLARE
gr sdo_georaster;
BEGIN
insert into GEO_MOSAIC_25K (id, georaster)
values (1, sdo_geor.init('RDT_MOSAIC_25K'))
returning georaster INTO gr;
sdo_geor.mosaic('GEO_25K', 'georaster', gr, '');
update GEO_MOSAIC_25K SET georaster=gr where id=1;
commit;
END;
--Then you need to validate the mosaic.
-- SELECT sdo_geor.validateBlockMBR(georaster), id FROM GEO_MOSAIC_25K;
SELECT t.id, sdo_geor.validategeoraster(t.georaster) isvalid from GEO_MOSAIC_25K t order by id;
--The in order to achieve real performance you need to pyramid the mosaic raster. If you don't specify a pyramid level then you oracle will calculate it.
--If you have set them max resolution to this layer using the Oracle calculated value will produce too many pyramid levels, you need to calculate how many pyramid value you will need
--See URL for Pyramiding http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28398/geor_intro.htm#CHDDEGJJ
DECLARE
gr sdo_georaster;
BEGIN
SELECT georaster INTO gr
FROM GEO_MOSAIC_25K WHERE id = 1 FOR UPDATE;
-- Generate pyramids.
sdo_geor.generatePyramid(gr, 'rLevel=5, resampling=NN');
-- Update the original GeoRaster object.
UPDATE GEO_MOSAIC_25K SET georaster = gr WHERE id = 1;
COMMIT;
END;
quit
These work fine until I include 'compression=JPEG-B'
Cheers,
David

Answer 1

Check document:
1.10.2 DEFLATE Compression of GeoRaster Objects
DEFLATE compression compresses objects according to the Deflate Compressed Data Format Specification (Network Working Group RFC 1951), and it stores the compressed data in ZLIB format, as described in the ZLIB Compressed Data Format Specification (Network Working Group RFC 1950). The ZLIB header and checksum fields are included in the compressed GeoRaster object.
Although DEFLATE compression is supported for GeoRaster objects of any size, the total size (columnsPerBlock * rowsPerBlock * bandsPerBlock * cellDepth / 8) of each block of the GeoRaster object must not exceed 1 gigabyte (GB). For large GeoRaster objects, you can call the SDO_GEOR.changeFormatCopy procedure to block the GeoRaster object into blocks smaller than1 GB, and then compress the GeoRaster object; or you can perform the blocking and compression in the same call to the SDO_GEOR.changeFormatCopy procedure.
Because DEFLATE compression is lossless, compression quality does not apply, and is ignored if it is specified.
compression
Specifies the compression type to be applied to the GeoRaster object. Must be one of the following values: JPEG-B, JPEG-F, DEFLATE, or NONE. (You can use NONE to decompress a compressed GeoRaster object.) If compression is not specified, the compression type of the source GeoRaster object is used. For more information about compression and decompression, see Section 1.10. Example: compression=DEFLATE