Changes between Version 5 and Version 6 of WKTRasterGSoC


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Timestamp:
Mar 22, 2011, 12:13:12 PM (13 years ago)
Author:
pracine
Comment:

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  • WKTRasterGSoC

    v5 v6  
    77 Mentor: Jorge Arevalo (jorge.arevalo at deimos-space.com)
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    9  The current GDAL driver support reading of PostGIS rasters objects from a PostgreSQL/PostGIS database but does not support writing to it. The project includes proposing a driver writer design and implementing it. You will familiarize yourself with GDAL-OGR development (one of the most used open source geospatial package), geospatial imagery concepts, open source development tools and code in C.
     9 A [http://www.gdal.org/ GDAL] driver allows reading/writing of raster (or images) data from/to formats like TIFF, PNG or JPEG.
     10
     11 The current GDAL PostGIS raster driver supports reading of PostGIS rasters objects from a PostgreSQL/PostGIS database but does not support writing. The project includes proposing a driver writer design and implementing it. You will familiarize yourself with GDAL-OGR development (one of the most used open source geospatial package), geospatial imagery concepts, open source development tools and code in C.
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     20 [http://www.quantdec.com/SYSEN597/GTKAV/section9/map_algebra.htm Map algebra] allow to create a new raster as a mathematical (or logical) function of one or two other rasters. e.g. raster3 = (raster1 + raster2) / 2
     21
    1822 A one raster version of ST_MapAlgebra already exist. We now need a two raster version. This version is much more complicated to implement as it must not only takes into account nodata values but also on-the-fly reprojection of non aligned rasters and multiple possibilities for the resulting extent when the two rasters do not have the same extent. It is also possible, but complicated, to optimize the algorythm in order to fill many areas as a chunck of data instead of pixel by pixel. The project includes reviewing the proposed algorythm and implementing it. You will familiarize yourself with PostGIS development (the most used open source geospatial database), geospatial imagery concepts, open source development tools and code in C and PL/pgSQL.
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