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calculate-tiles

Description

The tiles-calculate command calculates a collection of bounding boxes that contain roughly equal distributions of node data from the specified input(s) and writes the output to a file.

  • input - one or more OSM data inputs; specify multiple inputs by separating them with a semicolon

  • output - output file to write the tile boundaries to; valid formats are GeoJSON (*.geojson)

  • maxNodeCountPerTile - The maximum number of nodes in any tile. The default is 1000; optional only if pixelSize is not specified

  • pixelSize - The size of the pixel used in the calculation in degrees. The default is 0.001; optional only if maxNodeCountPerTile is not specified

  • random-seed - seeds the random number generator for consistent tile boundary selection; valid only if --random is specified; use -1 for no seeding; defaults to -1

  • --random - selects a single random tile from those calculated

If too low a value is specified for maxNodeCountPerTile or too high a value is specified for pixelSize, the algorithm used may not be able to find a solution.

This command makes use of the optional 'convert.bounding.box' configuration option to determine a subset of the input data to calculate tiles for. However, 'convert.bounding.box' is only currently supported for OSM API database or Hootenanny API database data sources. If any other data source is used with the option, this command will return an error.

Usage

hoot calculate-tiles (input(s)) (output) [maxNodeCountPerTile] [pixelSize] [random-seed] [--random]

Examples

Calculate tiles based on node density:

hoot calculate-tiles test-files/MyInputFile.osm MyOutputFile.geojson

Calculate tiles based on node density, specifying the maximum allowed node count per tile and a pixel size:

hoot calculate-tiles "test-files/MyInputFile1.osm;test-files/MyInputFile2.osm" MyOutputFile.geojson 1000 0.001

Calculate tiles based on node density, narrowing down to a subset of the data specified by a bounding box:

hoot calculate-tiles -D convert.bounding.box="34.04,31.17,34.05,31.18" hootapidb://hoot:hoottest@localhost:5432/hoot/MyInputDb MyOutputFile.geojson

Select a random tile based on node density:

hoot calculate-tiles test-files/MyInputFile.osm MyOutputFile.geojson --random

Select a random tile based on node density specifying a particular seed for the random number generator:

hoot calculate-tiles test-files/MyInputFile.osm MyOutputFile.geojson 1000 0.001 2 --random