Download a grid in Eduard

To download a grid do one of the following:

• Choose File > Download Grid (at the top of your screen).

• Click on the “Download a grid” button at the center of a new document. 

• Click on the Download button in the toolbar.

Specify the download area

Polar areas are not included by some elevation models. Polar areas without elevation data are indicated in red on the map.

The maximum downloadable area is limited for most elevation models. The MERIT, GEBCO and Mapzen elevation models can cover large areas.

Select the elevation model

For more information about the elevation models, click the links in the bottom-left corner of the download window.

Select the projection

Most elevation models are distributed in a “geographic” coordinates system using latitude and longitude coordinates. Mapzen Terrain Tiles use the web Mercator projection. Choose either “Mercator” or “Geographic”. Eduard transforms the downloaded grid when necessary, using cubic interpolation.

Download and save the grid file

Click Download to obtain the elevation grid, then save it as a GeoTIFF file.

GEDTM void values

GEDTM downloads contain void values in oceans.  Replace the void values  after downloading the grid, or select Eduard > Preferences > Downloads to always replace void values with a zero elevation.

MERIT DEM user name and password

A user name and a password are required to download MERIT DEM data. Request these at  http://hydro.iis.u-tokyo.ac.jp/~yamadai/MERIT_DEM/ . When you attempt to download MERIT DEM data and you have not provided a user name and a password, then the dialog below will guide you through the process . 

The MERIT DEM user name and password can also be changed with Eduard > Settings (from the Eduard menu at the top-left of your screen).

OpenTopography API key

ALOS, NASADEM and SRTM elevation models are provided by OpenTopography and require a free API key to download. Create an account and request an API key at  OpenTopography.org . When you attempt to download an elevation model from OpenTopography and you have not provided an API key, then the dialog below will guide you through the process of requesting and entering an API key. 

The OpenTopography API key can also be changed with Eduard > Settings (from the Eduard menu at the top-left of your screen). This is useful if you entered a wrong API key or want to change your key.

Mapzen downloads

Mapzen terrain data includes values below the mean sea level. Deep values can result in poor shaded relief. Eduard can replace all negative values with a zero value. To do so, select Eduard > Preferences (from the Eduard menu at the top-left of your screen), and activate Limit Mapzen Downloads to Mean Sea Level.

Download cache

Eduard caches downloaded MERIT DEM data and Mapzen terrain tiles. To adjust the cache size or clear the cache, select Eduard > Settings (from the Eduard menu at the top-left of your screen) and click Download. The cached data is stored on the main drive and can be removed by clicking Clear Cache. The cache will never exceed the maximum size specified in the Settings dialog.

See also

Import a grid

Export a grid

Crop a grid

Resample a grid

Void values