TERRAIN / ELEVATION DATA - ATTRIBUTION AND LICENCES
====================================================

Used by: RFConsult.UK RF Coverage Mapper (/coverage) and Pathloss (/pathloss).

Terrain elevation in these apps comes from the Mapzen Terrain Tiles (Tilezen "joerd"
project), published as an open dataset on the Registry of Open Data on AWS
(s3://elevation-tiles-prod). Tiles are downloaded, cached on rfconsult.uk and decoded
to elevation profiles for radio propagation calculations (adapted use). No source data
provider endorses RFConsult.UK or these apps.

  Dataset:      https://registry.opendata.aws/terrain-tiles/
  Attribution:  https://github.com/tilezen/joerd/blob/master/docs/attribution.md
  Data sources: https://github.com/tilezen/joerd/blob/master/docs/data-sources.md


REQUIRED ATTRIBUTION (as specified by Tilezen)
----------------------------------------------

* ArcticDEM terrain data DEM(s) were created from DigitalGlobe, Inc., imagery and
  funded under National Science Foundation awards 1043681, 1559691, and 1542736;
* Australia terrain data © Commonwealth of Australia (Geoscience Australia) 2017;
* Austria terrain data © offene Daten Österreichs – Digitales Geländemodell (DGM)
  Österreich;
* Canada terrain data contains information licensed under the Open Government
  Licence – Canada;
* Europe terrain data produced using Copernicus data and information funded by the
  European Union - EU-DEM layers;
* Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric Administration
* Mexico terrain data source: INEGI, Continental relief, 2016;
* New Zealand terrain data Copyright 2011 Crown copyright (c) Land Information New
  Zealand and the New Zealand Government;
* Norway terrain data © Kartverket;
* United Kingdom terrain data © Environment Agency copyright and/or database right
  2015. All rights reserved;
* United States 3DEP (formerly NED) and global GMTED2010 and SRTM terrain data
  courtesy of the U.S. Geological Survey.


SOURCE DATASETS AND LICENCES
----------------------------

Source / provider                         Licence                               Licence text
---------------------------------------   -----------------------------------   -------------------------------
SRTM, GMTED2010, 3DEP/NED (USGS)          Public domain (US Government work)    PUBLIC-DOMAIN-DATA-NOTICES.txt
ETOPO1 (NOAA)                             Public domain (US Government work)    PUBLIC-DOMAIN-DATA-NOTICES.txt
ArcticDEM (PGC / NSF)                     Unrestricted use, acknowledgement     PUBLIC-DOMAIN-DATA-NOTICES.txt
EU-DEM (Copernicus, European Union)       Copernicus free, full and open        COPERNICUS-EU-DEM-NOTICE.txt
                                          data policy (Reg. (EU) 1159/2013)
United Kingdom - Environment Agency       Open Government Licence v3.0          OGL-UK-3.0.txt
  LIDAR (data.gov.uk)
Canada - CDEM (NRCan)                     Open Government Licence - Canada 2.0  OGL-Canada-2.0.txt
Norway - Kartverket                       CC BY 4.0 International               CREATIVE-COMMONS-NOTICES.txt
Australia - Geoscience Australia          CC BY 4.0 International               CREATIVE-COMMONS-NOTICES.txt
Austria - data.gv.at DGM                  CC BY 3.0 Austria                     CREATIVE-COMMONS-NOTICES.txt
New Zealand - LINZ                        CC BY 3.0 New Zealand                 CREATIVE-COMMONS-NOTICES.txt
Mexico - INEGI                            INEGI free-use terms                  PUBLIC-DOMAIN-DATA-NOTICES.txt

Changes made by RFConsult.UK: tiles are decoded from RGB encoding to heights in metres,
resampled/interpolated along radio paths and combined with propagation models. The
underlying data are provided "as is"; see each licence for its warranty disclaimer.