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Creating a Pyramid with GDAL reltile for serving with GeoServer
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Creating a Pyramid with GDAL reltile for serving with GeoServer

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Brief description of the process to create a pyramid with GDAL retile for serving with GeoServer.

Brief description of the process to create a pyramid with GDAL retile for serving with GeoServer.

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  • hi,
    i used geoserver 2.0 and fwtools
    but gdal_retile.py does not work !!!!
    some one way help me? thanks
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  • 1. Creating a pyramid for serving via the GeoServer ImagePyramid plugin Ing. Simone Gianneccchini Ing. Daniele Romagnoli
  • 2. Outline  Concept of pyramid  GDAL retile  How to build a piramid  How to configure it in GeoServer
  • 3. Raster Data Pyramid  Multi-resolution hierarchy of tiles for a raster dataset  Lower level == higher resolution  Higher Level == reduced resolution  Lower Level == more tiles  Higher Level == less tiles  Can efficiently serve really large dataset at all resolution levels • Use as few files as possible
  • 4. Raster Data Pyramid  Creating a pyramid with gdal_retile  http://www.gdal.org/gdal_retile.html gdal_retile.py [-v] [-co NAME=VALUE]* [-of out_format] [-ps pixelWidth pixelHeight] [-ot {Byte/Int16/UInt16/UInt32/Int32/Float32/Float64/ CInt16/CInt32/CFloat32/CFloat64}] [ -tileIndex tileIndexName [-tileIndexField fieldName]] [ -csv fileName [-csvDelim delimiter]] [-s_srs srs_def] [-pyramidOnly] -levels numberoflevels [-r {near/bilinear/cubic/cubicspline}] -targetDir TileDirectory input_files  Serve with ImagePyramid GeoServer extension Not part of standard GeoServer Download from GeoServer site Install as explained here Check that the Raster Data Source list the ImagePyramid format
  • 5. Raster Data Pyramid  Prepare the list of tiles to be retiled ls *.tif > tiles.txt mkdir tiles  Create the pyramid with GDAL retile (grab a coffee!) gdal_retile -levels 3 -ps 2048 2048 -co "TILED=YES" -co "BLOCKXSIZE=256" -co "TILED=YES" -co "BLOCKXSIZE=256" -co "BLOCKYSIZE=256" -targetDir tiles --optfile tiles.txt -s_srs EPSG:3003 -targetDir tiles --optfile tiles.txt  Move the full resolution raster tiles to a folder called “0” cd tiles gdal_retile -levels 3 -ps 2048 2048 -co "TILED=YES" -co "BLOCKXSIZE=256" mkdir 0 -co "BLOCKYSIZE=256" -targetDir tiles --optfile tiles.txt mv *.tif 0  Create a mosaic for each level (its own directory) create an ImageMosaic store in GeoServer by pointing the store to the level directory (automagic index creation) remove the store when done  Rename each mosaic's auxiliary file to match the name of the pyramid  0.prj, 0.properties, 0.shp, 0.shx, 0.dbf
  • 6. Raster Data Pyramid  Define the pyramid.properties file: Place it at the root of the pyramid directory hierarchy Define the Envelope2D as per the 0 level properties file Set the Levels resolution as defined in each property file starting from the base level (0) to the last ResX0,ResY0 ResX1,ResY1 …. ResXN-1,ResY1N-1 LevelDirs contains the names for the reduced resolution directories LevelsNum indicates the number of reduced resolutions levels Name=pyramid Levels=1.0,1.0 2.0,2.0 4.0,4.0 LevelsDirs=0 1 2 LevelsNum=3 Envelope2D=1653000.0,4686200.0 1660200.0,4695240.0 Create a file pyramid.prj at the pyramid root
  • 7. Raster Data Pyramid  Add a new coverage using ImagePyramid plugin Available as a GeoServer's CoverageStore extension Download JAR from Extension and add to WEB-INF lib  Specify the pyramid.properties location as URL for the store
  • 8. Raster Data Pyramid  Overview of the Pyramid