Read info for a Mapbox Vector Tile layer on a GeoServer

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

Usage

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

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)

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: constructed URL, with style and TileMatrixSet replaced, and TileMatrix replaced with zoom 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://umassdsl.webgis1.com/geoserver')
info <- layer.info(xml, 'DEPMEP:streams')
#> Error in layer.info(xml, "DEPMEP:streams"): Error in readMVT: layer DEPMEP:streams is missing