get_opentopo

This function uses the Open Topography SRTM Version 3 files.

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
Amazon Web Services Terrain Tiles <https://registry.opendata.aws/terrain-tiles/>,
the Open Topography Global Datasets API <https://opentopography.org/developers/>,
and the USGS Elevation Point Query Service <https://apps.nationalmap.gov/epqs/>.

Jeffrey W Hollister

elevatr

Access Elevation Data from Various APIs

Jeffrey Hollister

Tarak Shah

Alec L. Robitaille

Marcus W. Beck

Mike Johnson

get_opentopo function

<dl><dt>locations</dt>
<dd>Either a <code>data.frame</code> of x (long) and y (lat), an 
<code>sp</code>, an <code>sf</code>, or <code>raster</code> object as input.</dd>
<dt>prj</dt>
<dd>A string defining the projection of the locations argument. The 
string needs to be an acceptable SRS_string for 
<code><a href="/link/CRS-class?package=elevatr&version=0.4.5" data-mini-rdoc="elevatr::CRS-class">CRS-class</a></code> for your version of PROJ. If a <code>sf</code> 
object, a <code>sp</code> object or a <code>raster</code> object 
is provided, the string will be taken from that. This 
argument is required for a <code>data.frame</code> of locations.</dd>
<dt>expand</dt>
<dd>A numeric value of a distance, in map units, used to expand the
bounding box that is used to fetch the SRTM data.</dd>
<dt>...</dt>
<dd>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.</dd></dl>

Arguments

Get a digital elevation model from the Open Topography SRTM Version 3 — get_opentopo

<dl>

<dt>locations</dt>
<dd>Either a <code>data.frame</code> of x (long) and y (lat), an 
<code>sp</code>, an <code>sf</code>, or <code>raster</code> object as input.</dd>


<dt>prj</dt>
<dd>A string defining the projection of the locations argument. The 
string needs to be an acceptable SRS_string for 
<code><a href='https://rdrr.io/pkg/sp/man/CRS-class.html'>CRS-class</a></code> for your version of PROJ. If a <code>sf</code> 
object, a <code>sp</code> object or a <code>raster</code> object 
is provided, the string will be taken from that. This 
argument is required for a <code>data.frame</code> of locations.</dd>


<dt>expand</dt>
<dd>A numeric value of a distance, in map units, used to expand the
bounding box that is used to fetch the SRTM data.</dd>


<dt>...</dt>
<dd>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.</dd>

</dl>

get_opentopo: Get a digital elevation model from the Open Topography SRTM Version 3

Description

Usage

Arguments