I welcomed the availability of high definition terrain data on my iPad which I can download for regions I really need it. Concerning this, I have two questions:

1) These data take up significantly more space than the lower resolution one. Since I can select for which regions to download it, I can taylor the compromise between storage space required and increased usability to my liking. However, it would be great if I could somehow also "release" those regions of high definition terrain data when I don't need it anymore. E.g., it might be good to have HD data for a particular flight into mountainous regions. After completion of the flight, however, I might never again visit this area and, hence, don't benefit from its being HD.

2) Is there a similar option to download HD terrain elevations for the PC version of SD?

Thanks, -- Chris.

Is it not obvious from the crisp terrain in the background? That's the basis upon which we do not always show the option.

It wasn't to me. In this case the edge of the HD terrain region extended far into a rather flat area for which I also wanted HD terrain (just for the kicks of it). It wasn't clear by the looks of it.

-- Chris.