Import GeoRaster with different SRID

Question

Hi,
I use the importFrom command to import TIF file into georaster table. I have raster files that's in two different SRID, 4267 NAD27 and 4269 NAD83. I have to use the georaster column in a sdo_relate query like the following.
select a.georid
from georaster_table a
where sdo_relate(a.GEORASTER.spatialExtent, MDSYS.SDO_GEOMETRY(2001, 4269, MDSYS.SDO_POINT_TYPE(-121.5, 42.5, null), null, null), 'MASK=ANYINTERACT')='TRUE';
My questions are:
1) Can I store two different SRID data in the same georaster column? I understand that after I generate the spatial extent I have to create a row in the user_sdo_geom_metadata column and give it a SRID. It seems like to me I'll have to store raster objects with different SRID in seperate georaster columns, is that correct?
2) Can I transform the TIF image into a specific SRID during, before or after the import so all my raster will have to the SRID?
Thanks,
-John

Answer 1

John,
For your first question. You can store all types of images and rasters in any SRID into the same GeoRaster table and in the same column.
It is when you want to build a spatial Rtree index on that column, you need to make sure all GeoRaster spatialExtent geomtries (i.e., footprints) have the same SRID, which is a requirement from Rtree index instead of GeoRaster itself. you can call sdo_geor.generateSpatialextent on different georaster objects of any SRID and then sdo_cs.transform the extents into geometries in the same SRID, on which the spatial is going to be built.
basically, if you wish you can use ONE single georaster table to store all or millions of images, which could cover the whole earth piece by piece. each of the images can have their own SRID (ground/model coordinate system), yet you can build a single spatial index (whole earth based such as WGS84) so that you can query images globally.
for your second question, the answer is no. at this moment, GeoRaster doesn't have image reprojection capability in 10g. if you want all images to be physically in the same SRID (model CS), you have to do it using third party tools, such as those from PCI and Leica etc.
hope this helps,
thanks
Jeffrey