Re: [talk-au] National Park unclosed poly, want advice
Thanks Paul, I'll see if that's an option, especially as it's not a named forest. Now I've also got this situation where the much larger but very low fidelity forest poly is conflicting with my new high-fidelity poly for the actual Murramarang National Park https://www.openstreetmap.org/#map=14/-35.6942/150.2560 I don't know whether to clean up the edge of the larger forest poly to use the same coastline nodes as my national park poly because there's also the issue that the national park probably can't be considered a subset of the forest poly as there are non-forest regions within the national park! Nathanael Coyne (Boehm) www.purecaffeine.com Canberra, Australia 0431 698 580 On 22 April 2015 at 05:41, Paul Norman penor...@mac.com wrote: On 4/18/2015 11:35 PM, Nathanael Coyne wrote: I'd appreciate if someone could have a look at it and tell me if it is valid or invalid and if invalid then where I should start with fixing it up, given it covers such a large area. http://www.openstreetmap.org/way/204064026#map=10/-35.8657/150.1611 The way itself isn't a polygon, but is part of the multipolygon http://www.openstreetmap.org/relation/1388357 It is valid, but an area this large is a problem to deal with for a number of reasons - You're more likely to conflict with people editing it - Checking validity is hard, as you need the entire polygon - It poses problems for rendering toolchains Coming from an area with many areas of trees, I have a few techniques. One is to end up splitting on an arbitrary line. While this fixes the problems, it's not ideal. A better route is to find an appropriate break in the trees. Typically along roads, rivers, power lines, and oil and gas lines there is a break in the trees. I try to find one and trace this break. This also tends to find clearings ( https://www.openstreetmap.org/#map=15/-35.8707/149.9854), unmapped roads branching off, and other features of interest. Don't feel you need to be perfect, particularly in a case like this where the original tracing is from landsat. ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] National Park unclosed poly, want advice
On 22 April 2015 at 06:23, Nathanael Coyne n...@purecaffeine.com wrote: Now I've also got this situation where the much larger but very low fidelity forest poly is conflicting with my new high-fidelity poly for the actual Murramarang National Park https://www.openstreetmap.org/#map=14/-35.6942/150.2560 I don't know whether to clean up the edge of the larger forest poly to use the same coastline nodes as my national park poly because there's also the issue that the national park probably can't be considered a subset of the forest poly as there are non-forest regions within the national park! As you've noted the National Park Boundary isn't going to always be natural=wood, so maybe keeping them in separate ways/multipolygons is best? Regarding the coastline, does the NP boundary extend to the coastline? Do the trees also extend that far? Normally you would get some rock or sand between the trees and the coastline, so they probably won't match up. It depends how much detail you want to put into it. ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] National Park unclosed poly, want advice
Forest polygons are generally understood to not be very precise. And the treeline changes over time anyway. Do don't bother to make those align. I do like to see edges of water and lakes matching up with the park poloygons, otherwise you end up with lots of strange color bands on rendered maps that seem to, but don't actually, have semantic meaning. Some people share nodes to make the match perfect. Others find that annoying to edit. To share nodes in JOSM click on two nodes and select join. ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] National Park unclosed poly, want advice
It does seem to be in a relation that is eventually closed http://www.openstreetmap.org/relation/1388357 You can download all the nodes/ways in the relation for use in JOSM using the Overpass API: http://overpass-turbo.eu/s/8RS http://overpass-api.de/api/interpreter?data=%0A%5Bout%3Axml%5D%5Btimeout%3A25%5D%3B%0A%28%0A%20%20relation%281388357%29%3B%0A%29%3B%0Aout%20meta%3B%0A%3E%3B%0Aout%20meta%20qt%3B On Sun, Apr 19, 2015 at 4:35 PM, Nathanael Coyne n...@purecaffeine.com wrote: Hi all, I've been doing a bit of coastal mapping and keep butting into this unclosed poly that's annoying me ... so I'd like to have a go at fixing it up, unless JOSM is just rendering it wrong because it's a multipart poly and I'm not downloading all the data it needs to close it? I'd appreciate if someone could have a look at it and tell me if it is valid or invalid and if invalid then where I should start with fixing it up, given it covers such a large area. http://www.openstreetmap.org/way/204064026#map=10/-35.8657/150.1611 Personally I think it needs to be split. Thanks, Nathanael Coyne (Boehm) www.purecaffeine.com Canberra, Australia 0431 698 580 ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
[talk-au] National Park unclosed poly, want advice
Hi all, I've been doing a bit of coastal mapping and keep butting into this unclosed poly that's annoying me ... so I'd like to have a go at fixing it up, unless JOSM is just rendering it wrong because it's a multipart poly and I'm not downloading all the data it needs to close it? I'd appreciate if someone could have a look at it and tell me if it is valid or invalid and if invalid then where I should start with fixing it up, given it covers such a large area. http://www.openstreetmap.org/way/204064026#map=10/-35.8657/150.1611 Personally I think it needs to be split. Thanks, Nathanael Coyne (Boehm) www.purecaffeine.com Canberra, Australia 0431 698 580 ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
Re: [talk-au] National Park unclosed poly, want advice
Thanks Alex, looks like I'll have to investigate Overpass API, but in the meantime I just pulled the XML for the relation and then used Download Members in JOSM. Will just keep it handy for when I'm working on coast areas and don't want that ugly unclosed poly line slashing through the middle of my work. Nathanael Coyne (Boehm) www.purecaffeine.com Canberra, Australia 0431 698 580 On 19 April 2015 at 17:37, Alex (Maxious) Sadleir maxi...@gmail.com wrote: It does seem to be in a relation that is eventually closed http://www.openstreetmap.org/relation/1388357 You can download all the nodes/ways in the relation for use in JOSM using the Overpass API: http://overpass-turbo.eu/s/8RS http://overpass-api.de/api/interpreter?data=%0A%5Bout%3Axml%5D%5Btimeout%3A25%5D%3B%0A%28%0A%20%20relation%281388357%29%3B%0A%29%3B%0Aout%20meta%3B%0A%3E%3B%0Aout%20meta%20qt%3B On Sun, Apr 19, 2015 at 4:35 PM, Nathanael Coyne n...@purecaffeine.com wrote: Hi all, I've been doing a bit of coastal mapping and keep butting into this unclosed poly that's annoying me ... so I'd like to have a go at fixing it up, unless JOSM is just rendering it wrong because it's a multipart poly and I'm not downloading all the data it needs to close it? I'd appreciate if someone could have a look at it and tell me if it is valid or invalid and if invalid then where I should start with fixing it up, given it covers such a large area. http://www.openstreetmap.org/way/204064026#map=10/-35.8657/150.1611 Personally I think it needs to be split. Thanks, Nathanael Coyne (Boehm) www.purecaffeine.com Canberra, Australia 0431 698 580 ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au ___ Talk-au mailing list Talk-au@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-au
