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Read info for a Mapbox Vector Tile layer on a GeoServer

Source: R/layer.info.R
layer.info.Rd

Reads all necessary info for reading Mapbox Vector Tiles from a GeoServer.

Usage

layer.info(xml, layer, crs = "EPSG:900913", base.url = NULL)

Arguments

xml

XML from getcapabilities. Use read.XML() to get this

layer

name of the layer, e.g., DEPMEP:streams

crs

coordinate reference system. For Mapbox Vector Tiles, you'll want EPSG:900913 (= EPSG:3857)

base.url

optional override for the server base URL (scheme+host+port+/geoserver). When NULL (default), the base is extracted from the ResourceURL in the capabilities XML. Supply the URL passed to read.XML() when the server's proxy base URL is misconfigured (e.g., missing a non-standard port), so tile requests use the correct host and port rather than what the XML reports.

Value

An MVT object, a four element list with:

  1. layer: name of layer (colon converted to underscore)

  2. box: bounding box (x-min, y-min, x-max, y-max)

  3. tiles: n x 5 matrix of zoom level, rowmin, rowmax, colmin, colmax

  4. url: TMS URL template; leaves {zoom}, {TileRow}, and {TileCol} to be replaced on reads

Details

Pulls necessary information for reading Mapbox Vector Tiles from a GeoServer's capabilities XML. Builds a template URL, with tags to be replaced by read.tile, when the target zoom level, row, and column are known.

Author

Bradley W. Compton bcompton@umass.edu

Examples

require(readMVT)
xml <- read.XML('https://marsh01.ecs.umass.edu/geoserver')
info <- layer.info(xml, 'DEPMEP:streams')