WebMapTiler

Features with raster geometry.

The resulting image tiles.

Specifies a method for tiling up data. This controls factors like the coordinate system, tile size, spacing, etc. See the Tile Schemes section for more details.

These parameters specify the zoom levels for which tiles will be generated. The exact meaning of a zoom level depends on the tile scheme, but in general a higher zoom level uses more pixels to cover the same area (i.e. more tiles will be generated).

If Minimum Zoom Level is unspecified, the minimum zoom level will default to the minimum level at which the raster is visible. Note that tiles will not be generated if the input raster covers less than 1 row and 1 column at a particular zoom level, regardless of the minimum zoom level value.

These parameters specify the zoom levels for which tiles will be generated. The exact meaning of a zoom level depends on the tile scheme, but in general a higher zoom level uses more pixels to cover the same area (i.e. more tiles will be generated).

If Maximum Zoom Level is unspecified, the maximum zoom level will be the smallest zoom level such that the resampled raster has more rows or columns than the original raster.

These parameters specify the size of each output tile for tile schemes that support user-defined sizes.

These parameters specify the size of each output tile for tile schemes that support user-defined sizes.

Cell values are interpolated in order to change the raster to the specified size. You can choose from these interpolation methods.

• Nearest Neighbor is the fastest but produces the poorest image quality.
• Bilinear provides a reasonable balance of speed and quality.
• Bicubic is the slowest but produces the best image quality.
• Average 4 and Average 16 have a performance similar to Bilinear and are useful for numeric rasters such as DEMs.

If specified, an attribute will be added to each output feature specifying the quadkey for that tile. Quadkeys are used by Bing Maps to uniquely identify a single tile at a particular level of detail. Note that this attribute will only be created for quad-tree based tile schemes (GoogleMapsCompatible and GoogleCRS84Quad).

If specified, an attribute will be added to each output feature specifying the zoom level of that tile.

If specified, an attribute will be added to each output feature specifying the column of that tile.

If specified, an attribute will be added to each output feature specifying the row of that tile.

If specified, an attribute will be added to each output feature that identifies which raster it was created from.  This index is zero-based, so all tiles created from the first input raster will have a value of 0, all tiles created from the second input raster will have a value of 1, etc.

If specified, an attribute will be added to each output feature identifying the total number of tiles created from the input raster, across all zoom levels.

This scheme is used by Google Maps, Bing Maps, Web Map Tile Service, and ArcGIS.

• Input rasters are required to be in the EPSG:3857 coordinate system.
• Tiles are always 256x256 pixels.
• Valid zoom levels are 0 to 23.
• At level 0, the entire world is represented by a 256x256 pixel tile. Each level increases the number of rows and columns by a factor of two: level 1 is 512x512, level 2 is 1024x1024, etc.
• The ExpressionEvaluator transformer can be used to setup tile numbering.

GoogleMapsCompatible zoom level 0 tiles (column, row):

 

GoogleMapsCompatible zoom level 1 tiles:

 

GoogleMapsCompatible zoom level 3 tiles:

This scheme is used by Web Map Tile Service.

• Input rasters are required to be in the LL84 coordinate system.
• Tiles are always 256x256 pixels.
• Valid zoom levels are 0 to 18.
• At level 0, the entire world is represented by a 256x256 pixel tile (where the first and last 64 rows of the tile are blank). Each level increases the number of rows and columns by a factor of two: level 1 is 512x512, level 2 is 1024x1024, etc.
• The ExpressionEvaluator transformer can be used to setup tile numbering.

This scheme is used by Web Map Tile Service.

• Input rasters are required to be in the LL84 coordinate system.
• Tiles may have a user-defined size.
• Valid zoom levels are 0 to 20.
• This scheme defines a spacing in degrees for each level, as follows:
  

Level	Spacing (degrees)
0	1.25764139776733
1	0.628820698883665
2	0.251528279553466
3	0.125764139776733
4	6.28820698883665e-2
5	2.51528279553466e-2
6	1.25764139776733e-2
7	6.28820698883665e-3
8	2.51528279553466e-3
9	1.25764139776733e-3
10	6.28820698883665e-4
11	2.51528279553466e-4
12	1.25764139776733e-4
13	6.28820698883665e-5
14	2.51528279553466e-5
15	1.25764139776733e-5
16	6.28820698883665e-6
17	2.51528279553466e-6
18	1.25764139776733e-6
19	6.28820698883665e-7
20	2.51528279553466e-7

This scheme is used by Web Map Tile Service.

• Input rasters are required to be in the LL84 coordinate system.
• Tiles may have a user-defined size.
• Valid zoom levels are 0 to 17.
• This scheme defines a spacing in degrees for each level, as follows:
  

Level	Spacing (degrees)
0	2
1	1
2	0.5
3	0.333333333333333
4	0.166666666666667
5	8.333333333333333e-2
6	3.333333333333333e-2
7	1.666666666666667e-2
8	8.333333333333333e-3
9	4.166666666666667e-3
10	1.388888888888889e-3
11	8.333333333333333e-4
12	2.777777777777778e-4
13	1.388888888888889e-4
14	8.333333333333333e-5
15	2.777777777777778e-5
16	8.333333333333333e-6
17	2.777777777777778e-6