Raster display

Question

Dear sir,
i finished loading process of raster into oracle database and trying to retrieve image in mapviwer. but nothing comes out even no any error message. would you please let me know what could be the reason
following is my parametes in mapviewer
xml_request=<?xml version="1.0" standalone="yes" ?>
<map_request
title="adfasdf"
datasource="mvdemo"
width="400"
height="360"
format="PNG_URL" >
<center size="7.450580596923828E-7">
<geoFeature>
<geometricProperty typeName="center">
<Point>
<coordinates>
600.0, 300.0
</coordinates>
</Point>
</geometricProperty>
</geoFeature>
</center>
<themes>
<theme name="geor_theme" >
<jdbc_georaster_query
jdbc_srid="82364"
datasource="mvdemo"
georaster_table="sf_rasters"
georaster_column="georaster"
raster_id="1"
raster_table=""
asis="false">
</jdbc_georaster_query>
</theme>
</themes>
</map_request>
xml_response=<?xml version="1.0" encoding="UTF-8"?>
<map_response>
<map_image>
<map_content url="http://localhost:8888/mapviewer/images/omsmap107_7.png?refresh=9087256295431213433" />
<box srsName="sdo:82364">
<coordinates>
599.9999995860788,299.99999962747097 600.0000004139212,300.00000037252903 </coordinates>
</box>
<xfm matrix="2.0696057845270843E-9 0.0 0.0 -2.0696057845270843E-9 599.9999995860788 300.00000037252903" />
<WMTException version="1.0.0" error_code="SUCCESS">
</WMTException>
</map_image>
</map_response>
and this is my valid sql statement for record 1
SQL> select georaster from sf_rasters where georid = 1;
GEORASTER(RASTERTYPE, SPATIALEXTENT(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), SDO_ELEM_INFO, SDO_ORDI
SDO_GEORASTER(21001, SDO_GEOMETRY(2003, 82364, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 1), SDO_ORDINATE_A
<objectI))
requesting for immediate reply
Thanks
Kabeer

Answer 1

Hi Kabeer,
In general please always:
1. run validatation first. for example:
select georid, sdo_geor.validategeoraster(georaster) from sf_rasters where georid = 1;
2. try to display the georaster object using the client-side command-line Java GeoRasterViewer or the MapBuilder to see if you can display the image.
3. During the display, do some image processing using the "image" manu if you only see black or white screen (due to raster cell values in lower value range or out of 8-bit range etc).
These could help narrow down the problems. At least make sure the raster was loaded and stored correctly on the database server.
just in case you didn't do these.
regards,
Jeffrey