Download the ZIP file containing all of the Elk and GDAL library files.

HGT files are the least reliable files as they tend to contain holes in the data, but they are the most basic form of DEM and you can download them from here. GeoTIFF files are available for 1 and 3 arc second resolutions for most of the earth and can be downloaded from the USGS Earth Explorer. The higher resolution IMG files are available for the United States only and can be downloaded from the USGS National Map Viewer. It currently accepts IMG files at a resolution of 1/3 arc second, GeoTIFF files at a resolution of 1 or 3 arc seconds, and HGT files at a resolution of 1 or 3 arc seconds. The Topography component can be used to generate points, curves, and a surface from various digital elevation model (DEM) file formats. This was a shuttle mission where most of the earth was scanned for elevation and packaged in 1°x1° tiles. Elk uses data that originates from the Shuttle Radar Topography Mission (SRTM) of 2000. USGS is a science organization that provides access to a large range of scientific data pertaining to the earth. It defaults to selecting Building elements, but can be changed to select from any of the other map features in the OSM spec. The OSMData component is what you use to start organizing and collecting the data from the OSM file. It wants a file path to an OSM file as it's input and will output OSMPoints, a Point3d with an OSM defined ID, the text string of the full XML file, and the latitude and longitude domains. The Location component is primarily for preprocessing all of the node or point data from the OSM export.

It allows you to export XML formatted data of a selected area and then Elk will organize and construct collections of point and tag data so that you can begin creating curves and other Rhino/Grasshopper geometry. is an open/crowd sourced website of mapping data. Elk is a set of tools to generate map and topographical surfaces using open source data from and USGS.

Download grasshopper rhino 5