Congrats, Arlindo! Here in Kibera, we purchased recent satellite imagery, but you can only tell so much. And we use the Garmin eTrex Legend HCx. Kibera is very dense, and the tracks are often not that precise. But in combination, we can have good certainty of where the paths lie .. the GPS tracks give a rough guide, and interpretation of the imagery with local knowledge helps a lot.
So my recommendation is the combination :) We're using Walking Papers too. We need to put some more work into WP .. Kibera POIs are so dense, some of the nodes aren't rendered, which can be confusing. Cheers Mikel == Mikel Maron == http://mapkibera.org/ +254 (0) 724899738 [email protected] ________________________________ From: Arlindo Pereira <[email protected]> To: osm-talk <[email protected]> Cc: Claudomiro Nascimento Junior <[email protected]>; Mikel Maron <[email protected]> Sent: Mon, November 23, 2009 4:39:24 AM Subject: Mapping a favela (slum) Hi there, I'm very proud to announce that I started to map my first favela here in Rio, the Favela Santa Marta [1] [2] [3]. It has a funicular system to the top, and I've added a couple of POIs. However (and obviously), the GPS tracks were completely erratic due to the sub-meter wide footpaths. I've tried with my Nokia N95 GPS. It is very dense [4] there, you can check how erratic was the log [5]. But it is already something! :D Judging the satelite image, what do you think it would be better: purchasing sub-meter pixel satellite imagery, an expensive GPS unit or a combination of both? I believe that once the main footpaths/stairways are mapped, we can have mapping parties with Walking Papers. I'd love to have the kids helping by adding POIs, for instance. Perhaps talking with the local school... Cheers, 1: http://osm.org/go/OVcx0aKmL- 2: http://pt.wikipedia.org/wiki/Favela_Santa_Marta 3: http://translate.google.com/translate?js=y&prev=_t&hl=pt-BR&ie=UTF-8&u=http%3A%2F%2Fpt.wikipedia.org%2Fwiki%2FFavela_Santa_Marta&sl=pt&tl=en 4: Check on Google Maps sat imagery (just to have an idea because Yahoo! imagery is very poor): http://maps.google.com.br/maps?f=q&source=s_q&hl=pt-BR&geocode=&q=dona+marta,+botafogo,+rj&sll=0,0&sspn=74.600551,158.027344&ie=UTF8&hq=&hnear=Botafogo+-+Rio+de+Janeiro+-+RJ&ll=-22.947333,-43.194632&spn=0.002262,0.004823&t=k&z=18 5: http://www.openstreetmap.org/user/Nighto/traces/570988 Please notice I forgot to pause the logging as soon as I left the slum so the track continue in a few streets (already mapped) -- Arlindo Saraiva Pereira Jr. Bacharelando em Sistemas de Informação - UNIRIO - uniriotec.br Consultor de Software Livre da Uniriotec Consultoria - uniriotec.com Acadêmico: [email protected] Profissional: [email protected] Geral: [email protected] Tel.: +5521 92504072 Jabber/Google Talk: [email protected] Skype: nighto_sumomo Chave pública: BD065DEC
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