Elevation data provides height above the sea level in meters for every single place in the world, measured for regions of approximately 30x30 meters.
The original raw open data from US Geological Survey (SRTM 1ARC ), NASA and METI (ASTER GDEM) and European Union (EU-DEM) has been modified, adapted and overlaid to "fill the gaps" and provide a seamless and directly reusable global digital elevation model.
The processing of the raw data has been done originally for the OpenSnowMap.org project by Yves Cainaud (Switzerland) and is now released under CC0 license. The original open data license is mentioned bellow.
USGS SRTM was declared public domain for the older version, now conditions mentions: https://lta.cr.usgs.gov/SRTM1Arc
SRTM is a joint NASA-NGA partnership. USGS EROS Data Center (EDC) distributes and archives SRTM data for NASA in accordance with policy guidelines set forth by NASA-NGA Memorandum of Understanding (October, 2003). See http://www.jpl.nasa.gov/srtm/mou.html Accordingly, NASA is now also processing mission data for research purposes in response to requests from NASA principal investigators and other qualified scientists. Under the terms of the new agreement, researchers submit their requests for international topography data to Dr. Michael Kobrick NASA/JPL. See http://www.jpl.nasa.gov/srtm/cbanddataproducts.html The requests are reviewed by NASA and NGA, and the data may be released either for limited use by the approved researchers or for broad public access. Decisions on how data will be released will be made on a case-by-case basis.
A written confirmation has been provided to www.opensnowmap.org, obtained by writing an email to [email protected] Please note that the Aster Data have been resampled (ie. average filter 10x10 pixels), and then can be redistributed. https://lpdaac.usgs.gov/user_services/aster_policies
NASA Approved and Educational Users of ASTER Data Received from the LP DAAC ASTER data are subject to redistribution and citation policies. Before ordering ASTER data, users must agree to redistribute data products only to individuals within their organizations or projects of intended use.
ASTER Global DEM (GDEM) data are subject to redistribution and citation policies. Before ordering ASTER GDEM data, users must agree to redistribute data products only to individuals within their organizations or projects of intended use, or in response to disasters in support of the GEO Disaster Theme. When presenting or publishing ASTER GDEM data, users are required to include a citation stating, "ASTER GDEM is a product of METI and NASA."
Because there are known inaccuracies and artifacts in the data set, please use the product with awareness of its limitations. The data are provided "as is" and neither NASA nor METI/ERSDAC will be responsible for any damages resulting from use of the data.
Why are there restrictions on the redistribution of the ASTER GDEM?
The ASTER GDEM is a joint contribution by NASA and the Ministry of Economy, Trade and Industry of Japan (METI) to the Global Earth Observation System of Systems (GEOSS). As such, both METI and NASA desire to understand the uses of the ASTER GDEM, expressed as one the GEOSS applications themes: disasters, health, energy, climate, water, weather, ecosystems, agriculture, or biodiversity. This requires both the registration of users, and restrictions on redistribution, to capture the intended use in terms of the GEOSS themes. These few restrictions on the ASTER GDEM commenced with the public distribution of tiles on June 29, 2009 and will continue through the life of the mission. Public access to the ASTER GDEM requires registration and acknowledgement of these restrictions at both the US and Japan server locations. All registration is kept confidential and is used solely for distribution metrics and possible notification of updates to the ASTER GDEM.
What restrictions apply to the redistribution of data?
The general principle is one of reversibility: If someone can recover the original x-y-z values from the new product, then that new product can NOT be re-distributed. This can also be defined as lossless recovery.
What are some examples of derived products that can NOT be re-distributed?
Transforming the data from GeoTIFF format to ESRI format Mosaicking or subsetting the data at the native (1 arc-second) or better resolution to serve up areas different than the original 1x1 degree tiles. Changing the units from meters to feet.
What are some examples of derived products that are re-distributable?
Reprojection that involved re-sampling, including nearest neighbor in cases where the reprojection involves more than a simple translation of an integer number of GDEM pixels. Creating a slope map. 3-D perspective visualizations.
Can "flyover" movies created using ASTER GDEM data be re-distributed?
Flyover movies may be re-distributed if the final product is produced in a format that will not allow the recovery of the original data (e.g., avi, Quicktime, wmv).
Can images created for publication or Web 2.0 applications (e.g., Wikipedia) using ASTER GDEM data be re-distributed?
Images that are created using GDEM data may be re-distributed through publications or social media applications. Papers citing such articles may be re-distributed as well.
The EU-DEM is a hybrid product based on SRTM and ASTER GDEM data fused by a weighted averaging approach and it has been generated as a contiguous dataset divided into 1 degree by 1 degree tiles, corresponding to the SRTM naming convention.
Access to the data is governed by the draft delegated regulation on Copernicus data and information policy, as approved by the EC on 12th of July 2013, and in the process of decision making by the Council and European Parliament. This delegated act supplements regulation (EU) No 911/2010 of the European Parliament and of the Council on the European Earth monitoring programme (GMES). It establishes registration and licensing conditions for GMES/Copernicus users and defines criteria for restricting access to GMES/Copernicus dedicated data and GMES/Copernicus service information.
The following credit must be displayed when using these data: "Produced using Copernicus data and information funded by the European Union - EU-DEM layers."
Access and use of the data is made on the conditions that:
1. When distributing or communicating Copernicus data and information to the public, users shall inform the public of the source of that data and information.
2. Users shall make sure not to convey the impression to the public that the user's activities are officially endorsed by the Union.
3. Where that data or information has been adapted or modified, the user shall clearly state this.
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