R4.xxx or greater.
SRTMv3 only goes up to 60 degrees north/south.
Europe obviously only covers Europe.
For larger areas, be sure to only choose the 90m layers. Otherwise it takes longer to download and consumes a lot of resources both locally on your machine, and on our servers.
i.e. a 30m layer is typically 9 times more data than a 90m layer. That means it takes 9 times longer to download, 9 times longer to extract, and consumes at least 9 times more memory.
Once you have downloaded the area you require, you should turn off downloads, by disabling the Allow Downloads option.
Flushing memory clears all data from ram and reloads it.
Custom Height data
if you have your own data layer you can insert it here.
the feather option defines how your custom height data blends with the base data (i.e. how it transition into SRTMv3 90m)
- A custom data layer can be an ASC height grid in WGS84 geographic. it must be in geographic coordinates.
- tiff can be used as well, as long as it is 32 bit, and stripped for any georef data. it needs a matching world file for referencing.
- You can order custom height data from cinemaplugins.com. Just get in touch and let us know what data you need.best is to make a gpx file for the area and send it with your request.
You can use programs such as global mapper to produce custom data, but teaching you how to use those programs is not part of our support.