get_mapzen_terrain

a <code>sp::bbox</code> object that is used to select x,y,z tiles.

The zoom level to return. The zoom ranges from 1 to 14. Resolution
of the resultant raster is determined by the zoom and latitude. For 
details on zoom and resolution see the documentation from Mapzen at 
<a href="https://mapzen.com/documentation/terrain-tiles/data-sources/#what-is-the-ground-resolution">https://mapzen.com/documentation/terrain-tiles/data-sources/#what-is-the-ground-resolution</a>

An API Key from Mapzen, create at 
<a href="https://mapzen.com/developers">https://mapzen.com/developers</a> Required. Set in your 
<code>.Renviron</code> file with the variable "mapzen_key"

api_key

A numeric value of a distance, in map units, used to expand the
bounding box that is used to fetch the terrain tiles. This can 
be used for features that fall close to the edge of a tile and 
additional area around the feature is desired. Default is NULL.

expand

Extra configuration parameters to be passed to httr::GET. Common 
usage is to adjust timeout. This is done as 
<code>config=timeout(x)</code> where <code>x</code> is a numeric value in 
seconds. Multiple configuration functions may be passed as a 
vector.

This function uses the Mapzen Terrain Tile service to retrieve an elevation
raster from the geotiff service. It accepts a <code>sp::bbox</code> object as 
input and returns a single raster object covering that extent. You should have
an api_key from Mapzen.

internal

Several web services are available that provide access to elevation
data. This package provides access to several of those services and
returns elevation data either as a SpatialPointsDataFrame from
point elevation services or as a raster object from raster
elevation services. Currently, the package supports access to the
Mapzen Elevation Service <https://mapzen.com/documentation/elevation/elevation-service/>,
Mapzen Terrain Service <https://mapzen.com/documentation/terrain-tiles/>,
Amazon Web Services Terrain Tiles <https://aws.amazon.com/public-datasets/terrain/> and the USGS
Elevation Point Query Service <http://ned.usgs.gov/epqs/>.

Jeffrey W Hollister

elevatr

Access Elevation Data from Various APIs

Jeffrey Hollister

Tarak Shah

get_mapzen_terrain function

The zoom level to return. The zoom ranges from 1 to 14. Resolution
of the resultant raster is determined by the zoom and latitude. For 
details on zoom and resolution see the documentation from Mapzen at 
<a href='https://mapzen.com/documentation/terrain-tiles/data-sources/#what-is-the-ground-resolution'>https://mapzen.com/documentation/terrain-tiles/data-sources/#what-is-the-ground-resolution</a>

An API Key from Mapzen, create at 
<a href='https://mapzen.com/developers'>https://mapzen.com/developers</a> Required. Set in your 
<code>.Renviron</code> file with the variable "mapzen_key"

get_mapzen_terrain: Get a digital elevation model from the Mapzen Terrain Tiles

Description

Usage

Arguments