Hello folks,
I spent some hours over the the last two weeks giving heightmaps of the 'hole-in-the-ground'-type a makeover because they all looked too similar to each other. As a result, I re-defined 4 categories (10 maps each) for heightmaps of the aforementioned type and gave them more distinct looks. I'm presenting to you:
The caldera: The edge of the crater is now elevated and the inner walls of the caldera show signs of erosion.
The gorge: The cliffs are now slightly eroded and the whole feel of heightmaps in this category is more 'bumpy', 'rocky' and 'spiky' than before.
The ravine: The cliffs are now very straight, steep and sharp.
The valley: Heightmaps in this category now have a generally 'softer' feel to them (think: rolling hills).
Also, it occurred to me that I did not create any heightmaps featuring rivers. So, I went ahead and remedied this glaring oversight by creating 10 heightmaps with just rivers on them and 10 with rivers plus some mountains. Here's an example:
For now, I'm all out of ideas. Maybe my 'Planet Heightmap' project (sorry, I could not resist) is finally coming to an end

Unless anyone has a suggestion of terrain he or she would like to see as a heightmap?
Thank you all for bearing with my over-excitement regarding the heightmap feature.
@Acala
Vielen herzlichen Dank für Deine wunderbare Arbeit. Ich habe mir alle Deine Heightmaps heruntergeladen. Ich werde sie bestimmt fleissig nutzen. Da ich jedes Mal meine Schwierigkeiten mit dem Terraforming habe, werde ich dank Deinen Heightmaps unzählige Stunden an Geländebearbeitung und noch viel mehr Nerven sparen können. Ich werde mal ein Bild von einem meiner Zoos posten, wenn ich dann mal so weit sein sollte.
Nochmals, tausend Dank für diese Karten.
Freundliche Grüsse aus der Schweiz!
Ich danke Dir für dein Feedback! Es freut mich immer sehr, wenn andere Spieler meiner Heightmap-Herumtüftelei etwas abgewinnen können

Über Screenshots von Zoos, die auf einer meiner Heightmaps gebaut wurden, freue ich mich natürlich ebenfalls!
Liebe Grüße aus Deutschland!
(Translation for everyone else reading this post:
Thanks for your feedback! I'm glad other players can make use of my fiddling with the heightmap feature

Of course, I'm also eager to see screenshots of zoos that have been built on one of my heightmaps!
Greetings from Germany!)