overviews_resampling average Average overviews resampling, computes the averate of all non-NODATA contributing pixels.ĭefining a custom tiling profile for a specified coordinate system ¶ Mostly used for elevation maps or similar. overviews_resampling near Nearest neighbor overviews resampling. Another possible method is Nearest neighbor. Resampling overviews produced by MapTiler are using average method, by default. (GDAL >= 1.10.0) -resampling mode Mode resampling, selects the value which appears most often of all the sampled points. resampling average Average resampling, computes the average of all non-NODATA contributing pixels.

resampling cubic_spline Cubic B-Spline Approximation (4x4 pixel kernel). resampling cubic Cubic convolution approximation (4x4 pixel kernel). Can be useful for quick testing, since it is much faster the the others. resampling near Nearest neighbor resampling. Selected method is used for interpolation of the values of individual pixels and it affects the sharpness vs smoothness of the produced maps. The visual quality of the output tiles is also defined by the resampling method. Default is 90.Įxample of the rendering of a seamless map out of file map1.tif and map2.tif into tiles with internal palette with optimal colors with higher visual : webp_alpha_quality The quality of WebP alpha channel compression. webp_quality The quality of WebP compression. If you experience issues with the visual quality of generated tiles with quantization involved try to set -quant_speed to lower values. Speed 10 has usually 5% lower quality, but is 8 times faster than the default. Speed 1 gives marginally better quality at significant CPU cost. Higher speed levels disable expensive algorithms and reduce quantization precision. quant_quality The quality of quantization. jpg_quality The quality of JPEG compression. There are some options to specify parameters of the conversion into image formats, which can significantly reduce size of produced tiles by degrading the output. Default background color is white (255,255,255), but you can specify your own with the option: -bg The color of the background replacing transparency in the non-transparent tile formats.

If partly transparent tiles are saved into a tile format without support for transparency (such as JPEG specified with -f jpg option) then the background color is applied. Otherwise the tile is marked as partly transparent with alpha. opaque, maximum alpha is 255), the alpha channel is discarded and the tile is marked as non-transparent / opaque. If all of the pixels are fully visible (eg. If the tile is completely transparent it is never saved to the disk to save the storage space. The transparency can come from the image itself as an alpha channel (with support for partly transparent areas), it can be derived from a selected color (so called NODATA color), or can be just a result of the transformation with the GDAL warping algorithm - for areas without available input data. No matter what input datasets you specify, after transforming them into the tiling profile projection, MapTiler will handle them as RGBA images. Tile transparency or a background color ¶ kmz and save it into the device.Įxample: command for producing tiles for use with Google Earth: garmin To produce format for Garmin GPS devices, with a size 1024x1024 pixels and output to. raster Rendering raster files without a need of georeference is possible as well. See the appropriate section under the Advanced options chapter for more information. custom You can specify your own tiling system. gearth Tile profile specific for Google Earth according the KML SuperOverlay definition. Compatible with most existing WMS servers, OpenLayers base map. These are the alternatives: -geodetic WGS84 Plate Caree / Unprojected. In case you wish to use other tiling system, you must specify it as the first command on the command line. To create high-resolution Retina / HiDPI tiles with double pixel resolution. It uses coordinate system defined as EPSG:3857 or EPSG:900913. The spherical mercator tile profile compatible with Google, Bing, Yahoo Maps, MapQuest, OpenStreetMap, and mobile maps on iOS and Android. MapTiler comes with three predefined most popular systems and possibility to specify a custom profile. A global option defining the output system of tiles - the target coordinate system, tile pixel size, etc.

Maptiler georeference