<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Hi John,</DIV>
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<DIV>In the similar lines as oracle GeoRaster, Xing Lin developed a<BR>raster model for PostGIS named PGRaster. Metadata is<BR>stored as fields of PGRASTER METADATA type with spatial extent<BR>(BBOX) and SRID. Raster value type refers to scale of measurement<BR>that can be nominal, ordinal, interval or ratio. The model<BR>coordinates have same unit as that of specified SRID. Actual image<BR>data is stored in PGRASTER object type with blocks. Geotiff2pgraster<BR>loader creates blocks, GIST index, and pyramid levels while<BR>importing the image into database. Some basic SQL functions to<BR>handle parameters of data model are provided; however, many<BR>functions for image manipulation are under development. The source<BR>code is distributed under the terms of GNU General Public Licence by<BR>Refractions Research Inc; however, there is a debate over Xing Lin's<BR>PGRaster source code and design regarding patent violation by<BR>Oracle.<BR><SPAN lang=EN>
<P><A href="http://lists.refractions.net/pipermail/postgis-devel/attachments/20070711/b6dfd192/PGRASTER\_20070710-0001.pdf">http://lists.refractions.net/pipermail/postgis-devel/attachments/20070711/b6dfd192/PGRASTER\_20070710-0001.pdf</A> </P>
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<P>Regards,</P>
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<P>--Imran</P></SPAN></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> John Zhang <johnzhang06@gmail.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> postgis-users@postgis.refractions.net<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Saturday, November 22, 2008 3:22:31 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [postgis-users] PGRaster<BR></FONT><BR>Hi there,<BR><BR>Could anyone tell me about that? Is it implemented in postGIS 1.3? Having read some articles about GeoRatser from Oracle, I was wondering if PostGIS's PGRaster is there for us to use. Any input on it would be much appreciated.<BR><BR>Have a good weekend<BR>John<BR></DIV></DIV></div><br>
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