PUBLIC-DOMAIN AND FREE-USE TERRAIN DATA - NOTICES
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These datasets form part of the Mapzen/Tilezen Terrain Tiles used by RFConsult.UK
/coverage and /pathloss. No endorsement by any agency is implied.

1. U.S. Geological Survey - SRTM, GMTED2010, 3DEP (formerly NED)
   Attribution:  United States 3DEP (formerly NED) and global GMTED2010 and SRTM
                 terrain data courtesy of the U.S. Geological Survey.
   Status:       Works of the U.S. Government; in the public domain in the United
                 States. USGS requests acknowledgement of the source.
   Information:  https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

2. NOAA - ETOPO1 Global Relief Model
   Attribution:  Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric
                 Administration
   Status:       Work of the U.S. Government; public domain. Citation: Amante, C. and
                 B.W. Eakins, ETOPO1 1 Arc-Minute Global Relief Model, NOAA Technical
                 Memorandum NESDIS NGDC-24, 2009.
   Information:  https://www.ncei.noaa.gov/products/etopo-global-relief-model

3. ArcticDEM - Polar Geospatial Center, University of Minnesota
   Attribution:  ArcticDEM terrain data DEM(s) were created from DigitalGlobe, Inc.,
                 imagery and funded under National Science Foundation awards 1043681,
                 1559691, and 1542736.
   Status:       Released for unrestricted use with acknowledgement.
   Information:  https://www.pgc.umn.edu/data/arcticdem/

4. INEGI (Instituto Nacional de Estadística y Geografía), Mexico
   Attribution:  Mexico terrain data source: INEGI, Continental relief, 2016.
   Status:       INEGI free-use terms (Términos de libre uso de la información del
                 INEGI): use, copy, distribute and adapt, including commercially,
                 with acknowledgement of INEGI as the source.
   Information:  https://www.inegi.org.mx/inegi/terminos.html

All of the above are provided "as is", without warranty of any kind.