OpenGeofiction

How to make these islands look realistic

Posted by Jamie Clumpas on 12 January 2020 in English (English)

Hey guys,

so I've just made these islands in the middle of the Cruzando delta. I've done my best on these, but they still don't really look like anything you might see in real life. Does anyone have any advice on how to spruce them up a bit?

Location: -1.948, 47.988

Comment from wangi on 12 January 2020 at 22:51

The most jarring thing to me is, why does it head north after the wetlands? Surely the wetlands should be the delta?

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Comment from Jamie Clumpas on 12 January 2020 at 22:56

For that one, you'd wanna talk to donnamaw. That said, they're not meant as complete wetlands as much as marshy forest.

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Comment from Mapping Expert on 12 January 2020 at 22:57

I agree with wangi at that point. Before thinking about how to make your islands realistic, you should ask yourself: How is it possible that there is a delta if all the water in the river passes through the wetland? Its wetland looks good, so you just have to divert the river.

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Comment from Jamie Clumpas on 12 January 2020 at 23:22

Thanks for the feedback, but again, that wasn't my mapping, and the river existed well before the marshlands did.

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Comment from wangi on 12 January 2020 at 23:45

But that really doesn't matter - the delta / wetlands there is a good basis for the country boundary, and that's an ideal thing for neighbouring owners to work together on.

You of course can still have a delta where you have it, but it's going to naturally fed by the mountains to the west of it.

L

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Comment from Jamie Clumpas on 13 January 2020 at 00:15

So how 'bout those islands?

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Comment from MrOobling on 13 January 2020 at 17:26

As I believe wangi and Mapping Expert are trying to tell you, as it is right now, the entire delta is unrealistic, not just the islands (which are ok, just use the OGF scale helper to compare it with a real world delta of similar size), and as such, its a bit pointless to give feedback specifically on the islands.

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Comment from iiEarth on 13 January 2020 at 18:00

You could make the islands in the proposed and more realistic delta? Just because it was there before, doesn't mean that you can't edit it. It's your territory now.

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Comment from Jamie Clumpas on 13 January 2020 at 23:52

Hey guys. I made the delta months ago, while the forest to the south was mapped by my neighbour Donnamaw, as we are currently working on natural features in partnership. My belief was that it just was to be mapped as forest, so I'm happy to just get rid of the wetlands tag, and leave it as just a forest.

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Comment from iiEarth on 14 January 2020 at 01:33

I mean, you could do that, but the wetlands are already well-mapped, so it would be a shame.

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Comment from histor on 14 January 2020 at 01:59

I think, at the first look far away the wetlands may look good - but if you look nearer, then there we see some chaotic mapping - often in three layers.

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Comment from Jamie Clumpas on 14 January 2020 at 02:09

Comments - 11 Advice with the islands - 0

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Comment from Luciano on 14 January 2020 at 05:50

Whenever I'm stumped at how to make something realistic, I look at something real.

Find a river mouth of similar size and configuration to the river mouth you're trying to draw in the real world. For example, this river in Guyana - similar size, similar islands, similar tropical latitude, similar southwest to northeast geography:

https://tile.opengeofiction.net/util/map_scale.html?map=C/10.465948168934606/-1.96784/47.98786&map2=OSM/x/6.91545/-58.49964&pxpt=0.2767&scale=400000

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Comment from coshatiuav on 14 January 2020 at 08:37

I say making a whole new river running parallel to and north of the border is a more realistic idea.

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Comment from Alessa on 14 January 2020 at 15:14

@Jamie_Clumpas: You are missing the point about the comments. They are about the islands, as they will not look realistic if their environment doesn't look realistic. Remember that any given entity requires its environment to help in order for realism to be fulfilled. Luciano gave you a great real-world example to model, and there are so many more.

So, keep these points in mind:

  • The drainage valley of the river actually determines the size of the islands, the delta's footprint, and the amount of water that flows into the sea. Changing it from the point south to this valley to the west dramatically alters the character of the delta. That is why these comments matter. I strongly advise moving the source of the delta to the indicated valley.
  • The drainage basin from the south, as it is now, would actually cause more sediment to be plopped into the sea than the tides would wash away based on its current geography. So, you would end up with a delta footprint that protrudes into the sea than the other way around. If it is from the west, the better and more realistic impact is a result. It would look more like the one Luciano gave you, along with this one a little further northwest. Both are excellent real-world ones, but it requires a drainage basin from the west and not the south.
  • The islands are not surrounded by long channels that gradually disperse into the sea. The channels need to be longer, with a gradual increase in size. Water essentially "piles up" as it flows downstream and slows down. It's like a huge traffic backup. Not all the water can mix into the ocean quickly, and the sloping of the river, while it seems negligible at first, is much greater than the 0 at sea-level. Water has to have somewhere to go; and when it slows down, it drops sediment. So, you end up with islands that are narrower upstream than they are downstream. And, you have water that breaks through soft areas of islands and runs through them, creating further channels. If you want a good experiment, I suggest taking some sand, build a little channel, and running water through it a few times. You'll be amazed at what happens.
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Comment from iiEarth on 14 January 2020 at 16:33

Agreeing with Alessa— the fact that we are telling you to relocate the river means that the islands would not exist; implying that we do not want the islands to be there in the first place.

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