OpenStreetMap

Mapping lake shore

Posted by kucai on 7 August 2016 in English.

I started refining the shore boundary of Lake Kenyir, reputedly the largest (or 2nd?, not sure, another lake is being filled up in Sarawak) in South east asia. Soon enough, I realized that there are jillions of coves that might need to be mapped, which brings the question of what’s the acceptable level of fidelity when dealing with this kind of mapping. (this would certainly the case when mapping a country’s shorelines too.)

I finally ended up using the ‘triangle’ method. 2 points at the jutting land ends of a cove (which is also called a point in bass fishing:) ) and 1 in the middle of the cove. If that is still too rough, add a point to either side of the middle point, which usually is good enough to show up as a cove in higher zoom renderings.

Oh well.. I probably need to visit these places with fishing gear.. you know.. verification purposes and all that. hah!

Location: Hulu Terengganu, Terengganu, Malaysia

Discussion

Comment from Glassman on 7 August 2016 at 05:25

Looks like it could use some refinement, but glad you added the lake.

Comment from Warin61 on 7 August 2016 at 06:57

If your using JOSM there is a plugin called scan aerial that may help to start mapping the crinkly bits.

Comment from BushmanK on 7 August 2016 at 15:51

If you don’t want to master your Zen meditation skill, it’s better to use supervised semi-automated tracing/classification methods, as it was previously suggested.

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