[Talk-es] Revising the border between Spain and Portugal
Hello all, I'm writing this text to let you know that during my work of adding/fixing proper administrative divisions in Portugal I noticed that the border between our countries had, sometimes, broken relations and/or slight way deviations according to the data I'm using. I'm offering my time to revise this data and to fix any bordering relation that may happen to be broke/incomplete on the Spanish side, but I'm interested to know your opinion first before I do any changes, specially those involving moving ways around. I'm also looking for the official data you use to map Spain's administrative limits: this way I can compare both Spain's and Portugal's official data and get trustworthy border limits. As a closing note, I'm writing this in English because I'm afraid I'd do a lot of grammatical errors and be misunderstood if I wrote in Spanish. To identify myself, I'm ViriatoLusitano. [1] [1] http://www.openstreetmap.org/user/ViriatoLusitano -- Um Abraço, Marcos Oliveira ___ Talk-es mailing list Talk-es@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-es
Re: [Talk-es] Revising the border between Spain and Portugal
Iván, Thank you for your reply, I'll try my best to make it accurate! If you want to be extra accurate, you'll have to survey the boundary milestones along the border, recalculate river centerlines and try to match everything to old documents. Regarding rivers, I normally disregard mapping the administrative limit that overlaps a river because I use the river itself, with up-to-date imagery, to find the center line of it. Would you do it differently? Speaking of disputes and old documents, what's your point of view about Olivenza? I suggest you get up-to-date on how to tag territorial disputes in OSM. I believe OSM's maxim of following the ground truth so I'd say Olivenza is for all intents territory of Spain. Still, I can look into disputed territories like Crimea to get an idea of what to do and do something about it in Olivenza. 2015-04-09 12:47 GMT+01:00 Iván Sánchez i...@sanchezortega.es: El Jueves 9. abril 2015 12.21.12 Marcos Oliveira escribió: I'm also looking for the official data you use to map Spain's administrative limits What you want is the files for Líneas Límite Municipales from here: http://centrodedescargas.cnig.es/CentroDescargas/equipamiento.do?method=mostrarEquipamiento Be aware that Spain doesn't have one true set of boundaries. Some municipalities have different data than the regional goverment, which might have different data than the national government. Usually the difference is no bigger than a few meters in the worst case. Submeter accuracy for boundaries doesn't seem like a big problem, until you're faced with the problem of taxing buildings constructions which lay exactly on a boundary (e.g. http://www.openstreetmap.org/#map=19/40.78820/-4.00284 - I know, first-hand, that there was a small dispute between regional governments about who should tax one of the water depots there) If you want to be extra accurate, you'll have to survey the boundary milestones along the border, recalculate river centerlines and try to match everything to old documents. Speaking of disputes and old documents, what's your point of view about Olivenza? I suggest you get up-to-date on how to tag territorial disputes in OSM. As a closing note, I'm writing this in English because I'm afraid I'd do a lot of grammatical errors and be misunderstood if I wrote in Spanish. To identify myself, I'm ViriatoLusitano. [1] Vc pode falar portunhol, a gente vai comprender ;-) -- Iván Sánchez Ortega i...@mazemap.no i...@sanchezortega.es ___ Talk-es mailing list Talk-es@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-es -- Um Abraço, Marcos Oliveira ___ Talk-es mailing list Talk-es@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-es
Re: [Talk-es] Revising the border between Spain and Portugal
El Jueves 9. abril 2015 12.21.12 Marcos Oliveira escribió: I'm also looking for the official data you use to map Spain's administrative limits What you want is the files for Líneas Límite Municipales from here: http://centrodedescargas.cnig.es/CentroDescargas/equipamiento.do?method=mostrarEquipamiento Be aware that Spain doesn't have one true set of boundaries. Some municipalities have different data than the regional goverment, which might have different data than the national government. Usually the difference is no bigger than a few meters in the worst case. Submeter accuracy for boundaries doesn't seem like a big problem, until you're faced with the problem of taxing buildings constructions which lay exactly on a boundary (e.g. http://www.openstreetmap.org/#map=19/40.78820/-4.00284 - I know, first-hand, that there was a small dispute between regional governments about who should tax one of the water depots there) If you want to be extra accurate, you'll have to survey the boundary milestones along the border, recalculate river centerlines and try to match everything to old documents. Speaking of disputes and old documents, what's your point of view about Olivenza? I suggest you get up-to-date on how to tag territorial disputes in OSM. As a closing note, I'm writing this in English because I'm afraid I'd do a lot of grammatical errors and be misunderstood if I wrote in Spanish. To identify myself, I'm ViriatoLusitano. [1] Vc pode falar portunhol, a gente vai comprender ;-) -- Iván Sánchez Ortega i...@mazemap.no i...@sanchezortega.es ___ Talk-es mailing list Talk-es@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-es
