From: Guilhem B. <gui...@gm...> - 2008-03-17 09:23:52
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Hi, I've just discovered that OpenStreetMap has ability to produce a "beautiful" SRTM contour layer: http://wiki.openstreetmap.org/index.php/Contours I'm sure that such layer could be really really usefull for Viking (for planning hicking trip for example). But, I didn't find any server providing only this data. The most promising is certainly OpenPisteMap: http://openpistemap.org/ It's a OSM derivated site offering a rendering dedicated to ski pistes. Let's go people, search and find a server hosting these data :-) -- Guilhem BONNEFILLE -=- #UIN: 15146515 JID: gu...@im... MSN: gui...@ho... -=- mailto:gui...@gm... -=- http://nathguil.free.fr/ |
From: Christoph E. <ce...@ch...> - 2008-03-17 18:28:48
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Hi, > I've just discovered that OpenStreetMap has ability to produce a > "beautiful" SRTM contour layer: > http://wiki.openstreetmap.org/index.php/Contours > I'm sure that such layer could be really really usefull for Viking > (for planning hicking trip for example). Yep, see another nice example on gravitystorm.co.uk: http://www.gravitystorm.co.uk/osm/?zoom=10& lat=6179964.14529&lon=854240.2946&layers=B00 > But, I didn't find any server providing only this data. The most > promising is certainly OpenPisteMap: http://openpistemap.org/ > It's a OSM derivated site offering a rendering dedicated to ski pistes. > > Let's go people, search and find a server hosting these data :-) Of course it was possible to render srtm contours with transparent "gaps", but I doubt anyone has an interest to do this. Even if, it required that in Viking I could define a custom tile server when creating a new "OSM" layer. This would be cool anyway, so one could (for example) include any tile server compatible with OpenLayers (e.g. see the URL above). As we are at it, here's another "request": Was it possible to add support for WMS servers? Best regards, ce |
From: Jocelyn J. <joc...@gm...> - 2008-03-17 18:45:02
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Hi, Le 17 mars 2008, Guilhem Bonnefille a écrit : > I've just discovered that OpenStreetMap has ability to produce a > "beautiful" SRTM contour layer: > http://wiki.openstreetmap.org/index.php/Contours I have recently seen the same page, and asked myself the same question :) I did a quick test by taking the SRTM, generating shape files, and converting them to gpx files. It looked nice with 100-meter contours, and viking was fast enough on my Athlon X2 3600+ when showing a square tile 1-degree high. With 10-meter contours, it was a lot slower. I think that it might be nice to render contours in "real-time", without using a picture. It will take a lot less space on hard drive space, and viking should be able to show the traces with some optimizations - like using 10-meter contours on big zoom, 100-meter on smaller zoom, ...; and also by showing only what really appears on screen. I didn't take a look at SRTM layer, but can it be easily modified to convert the SRTM files to gpx files after having downloaded them, and showing these ? Jocelyn |
From: Quy T. <qto...@gm...> - 2008-03-17 19:53:01
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Jocelyn Jaubert wrote: > I did a quick test by taking the SRTM, generating shape files, and > converting them to gpx files. I did some experiments on a similar path a while ago but I haven't got time to pursuit much further since. > I think that it might be nice to render contours in "real-time", > without using a picture. It will take a lot less space on hard drive > space, and viking should be able to show the traces with some > optimizations - like using 10-meter contours on big zoom, 100-meter on > smaller zoom, ...; and also by showing only what really appears on > screen. I was thinking that, too. I believe if we could work out more suitable algorithm to generating contours from SRTM, we should be able to do it on fly. Failing to do that, we can generate compressed gpx files. (It should not be impossible to teach viking to read shape files, but I think shape files is a bad idea). Pre-generated files can be useful for small devices (eeepc came to my mind). > I didn't take a look at SRTM layer, but can it be easily modified to > convert the SRTM files to gpx files after having downloaded them, and > showing these ? I think modifying SRTM layer (or viking in general) is the easier part. If you could proceed further on harder parts (eg efficiently converting SRTM to some displayable format) please let us know. Thoughts or codes (in any programming language) will be welcome here. Quy |
From: Christoph E. <ce...@ch...> - 2008-03-17 20:19:24
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Hi, > I was thinking that, too. I believe if we could work out more suitable > algorithm to generating contours from SRTM, we should be able to do it > on fly. Failing to do that, we can generate compressed gpx files. There's already a tool to convert srtm data to osm files. Maybe it's useful. It works on Linux as well using Momo: http://wiki.openstreetmap.org/index.php/Srtm2Osm Cheers, ce |
From: Victor W. <vi...@wa...> - 2008-03-18 06:17:21
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On 2008.03.18 at 06:53:03 +1100, Quy Tonthat wrote: > Pre-generated files can be useful > for small devices (eeepc came to my mind). Small doesn't mean "powerless". Eee PC have quite powerful processor. Of course modern graphic libraries can vaste even gigahertzes, but first of all EeePC is storage-limited. |
From: Quy T. <qto...@gm...> - 2008-03-18 17:29:02
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Victor Wagner wrote: > On 2008.03.18 at 06:53:03 +1100, Quy Tonthat wrote: >> Pre-generated files can be useful >> for small devices (eeepc came to my mind). > > Small doesn't mean "powerless". Eee PC have quite powerful processor. "Powerful"/"powerless" is subjective. eeepc is definitely has significantly less CPU power than any of my ancient desktops. In that sense, by "small" I did mean "small CPU power". But perhaps I'm spoiled. > Of course modern graphic libraries can vaste even gigahertzes, but > first of all EeePC is storage-limited. I don't consider storage is the limit for eeepc. With its 3 USB ports, I can add more storage than I'd need, considering flash memory is so cheap nowadays (I can be wrong. My first hard drive had only 10 MB, "MB" is not a typo, and I paid a fortune for it). Quy |
From: Quy T. <qto...@gm...> - 2008-03-18 17:46:59
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Quy Tonthat wrote: > is so cheap nowadays (I can be wrong. My first hard drive had only 10 MB, > "MB" is not a typo, and I paid a fortune for it). Just in case someone wonder what "a fortune" means, I could have bought a car instead. Quy |
From: Victor W. <vi...@wa...> - 2008-03-18 17:55:45
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On 2008.03.19 at 04:29:01 +1100, Quy Tonthat wrote: > "Powerful"/"powerless" is subjective. eeepc is definitely has significantly > less CPU power than any of my ancient desktops. In that sense, by "small" It couldn't be ancient. As recently as five years ago I had dual 233Mhz in my desktop. And still have 233Mhz in my Thinkpad 600 notebook. And I don't think I'd upgrade it before it dies. Although I've not tried to use viking on this notebook yet. But I think main limitation would be RAM, not CPU speed. > I did mean "small CPU power". But perhaps I'm spoiled. > >Of course modern graphic libraries can vaste even gigahertzes, but > >first of all EeePC is storage-limited. > > I don't consider storage is the limit for eeepc. With its 3 USB ports, USB flash drive is not an option for portable device. As permanently attached storage at least. Even with not-so-portable notebook I've broken three or five bluetooth USB sticks just browsing Web in the bed. USB flash drives, USB network cards and bluetooth dongles are quite vulnerable to the mechanical damage if you are not sitting at the desk. And viking is obvois candidate for use in the field. For some uses it would be even quite desirable to put device into some sort of water-proof cover, which would hardly coexist with access to external flash drives. > I can add more storage than I'd need, considering flash memory > is so cheap nowadays (I can be wrong. My first hard drive had only 10 MB, > "MB" is not a typo, and I paid a fortune for it). > > Quy > |
From: Quy T. <qto...@gm...> - 2008-03-18 18:12:42
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Victor Wagner wrote: > USB flash drive is not an option for portable device. As permanently attached > storage at least. Even with > not-so-portable notebook I've broken three or five bluetooth USB sticks > just browsing Web in the bed. USB flash drives, USB network cards and > bluetooth dongles are quite vulnerable to the mechanical damage if you > are not sitting at the desk. In my small mind, I don't see how USB network/bluetooth has anything to do with this. We are talking about storage here, don't we. > And viking is obvois candidate for use in the field. For some uses it > would be even quite desirable to put device into some sort of > water-proof cover, which would hardly coexist with access to external > flash drives. Excuse me for my ignorance, I don't really understand what you are talking about. Forgive me if I'd ignore you if you could not explain yourself. Quy |
From: Victor W. <vi...@wa...> - 2008-03-18 18:13:03
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On 2008.03.19 at 04:46:58 +1100, Quy Tonthat wrote: > Quy Tonthat wrote: > > is so cheap nowadays (I can be wrong. My first hard drive had only 10 MB, > > "MB" is not a typo, and I paid a fortune for it). > > Just in case someone wonder what "a fortune" means, I could have bought > a car instead. Probably you haven't store high-resolution maps for entire country on this drive. I've worked with GIS when 40Mb was considered decent storage for workstation. And somewhat later, when 1Gb drives were afforable, we once have processed 1: 2500 000 map coverage for entire Russia using PC Arc/Info. We have to burrow additional 1Gb drive for Arc/Info temporal files and attach it as second drive to our most powerful workstation. Just to let topology building finish. Of course, it have taken hours to build topology of 27000 polygons on such hardware. It was early Pentium, AFAIR. |
From: Quy T. <qto...@gm...> - 2008-03-18 18:34:28
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Victor Wagner wrote: > On 2008.03.19 at 04:46:58 +1100, Quy Tonthat wrote: > >> Quy Tonthat wrote: >>> is so cheap nowadays (I can be wrong. My first hard drive had only 10 MB, >>> "MB" is not a typo, and I paid a fortune for it). >> Just in case someone wonder what "a fortune" means, I could have bought >> a car instead. > > Probably you haven't store high-resolution maps for entire country on > this drive. You are right. I never attempted to store the whole Australian maps in one drive. I selected what maps I need when I went out. I'd wish I could have the world maps at any solution available at anytime though, but I know it is not possible for now though. I know I'm an idiot. > I've worked with GIS when 40Mb was considered decent storage > for workstation. And somewhat later, when 1Gb drives were afforable, > we once have processed 1: 2500 000 map coverage for entire Russia using > PC Arc/Info. We have to burrow additional 1Gb drive for Arc/Info > temporal files and attach it as second drive to our most powerful > workstation. Just to let topology building finish. Of course, it have > taken hours to build topology of 27000 polygons on such hardware. It was > early Pentium, AFAIR. I'd admire so much for you knowledge. Please let viking have some advantage of your vast knowledge. That's what open source is all about. Quy |
From: Quy T. <qto...@gm...> - 2008-03-18 18:59:58
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Quy Tonthat wrote: > I'd admire so much for you knowledge. Please read "your" (not "you"). It was a typo. My apologies. Quy |