WMTS: Few Things I Want To Remember

• Used to serve prepared rectangular tiles; this means you are limited by web server speed rather than map server speed
• Several ways to retrieve tiles are defined: KVP and REST are mandatory, SOAP is optional
• Does not allow layer combination; additional tile matrix would have to be created
• GetCapabilities, GetTile and GetFeatureInfo requests are defined
• tile
• rectangular representation of space
• defined by tile and row indices
• tile matrix
• set of tiles for a given scale
• defined with:
  • tile size derived from standardized pixel size (0.28 × 0.28 mm)
  • tile width and tile height (px)
  • left upper corner coordinates
  • matrix width and height as number of tiles
• tile matrix set
• set of tile matrices for different scales

Total count of tile matrices

nTileMatrices × nTiledStyles × nTiledFormats (if no dimensions are defined)

Total count of tiles in a tile matrix

matrixWidth × matrixHeight

Other equations

• pixelSpan = scaleDenominator × 0.28 103 / metersPerUnit(crs);
• tileSpanX = tileWidth × pixelSpan;
• tileSpanY = tileHeight × pixelSpan;
• tileMatrixMaxX = tileMatrixMinX + tileSpanX × matrixWidth;
• tileMatrixMinY = tileMatrixMaxY - tileSpanY × matrixHeight;