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cseu

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Everything posted by cseu

  1. Guys i'm back to business... Rocking GIS all over the place, thanks for allowing me back into the matrix...
  2. Hi, the only alternative i can think of : http://professionnels.ign.fr/rgealti Unfortunately the data ain't free. But the cost isn't astronomical if you really need it. Most of the data is obtained by lidar, you can download for free the metadata rasters that indicate the source of data in your region of interest... You could easily determinate the precision before hand. I know no other reliable source for what you're looking for. Hope it helps. Cheers.
  3. I've been moved to inactive members as well. Thanks !
  4. Bonne nouvelle... voyons l'étendue de la communauté francophone ;-)
  5. Apparently the same as spot 6 : 1.5m natural colors. I haven't found anywhere the resolutions of panchromatic and multispectral bands. Certainly not enough resolution for the price they'll probably sell the imagery...
  6. This may also help : http://pubs.er.usgs.gov/publication/ds769 It's suggested to transform bathymetric data to NAVD88 using vdatum site and use it for the whole map.
  7. Those may be useful references : http://vdatum.noaa.gov http://tidesandcurrents.noaa.gov/datum_options.html Good luck.
  8. OK... I've looked more in details and there is no easy way that i know of to do this in ArcScene... or at least it will be hard to configure to get exactly what you showed here. I strongly encourage you to use Golden Software Surfer which is the tool designed specially to make such maps...
  9. What do you mean by XYZ Vector ? Do you mean XYZ grid ?
  10. Surfer from Golden Software or ArcScene from ESRI.
  11. This one is gonna be pretty tricky... You won't be able to use this WMS in ArcGIS... I can't even see the GetCapabilities document... If you really need it i suggest you the GDAL WMS approach (see here : http://www.gdal.org/frmt_wms.html ). Good luck.
  12. cseu

    New Google Maps

    They've actually removed the terrain layer... and i hate that !
  13. Hariasa... It works fine with GM15. First assure you're within the bounds of the imagery. Then create a rectangular area of the zone you want to download and proceed just as maunaloa says. Keep in mind the scale... The reason you get blank raster may be that you're downloading it outside the range (which are sadly not specified in the WMS server capabilities document)... I've successfully downloaded reasonably large datasets from 1:3000 to 1:20000 scales on you server. Also note that the server is VERY slow, be patient. The bbox is : <LatLonBoundingBox minx="114.05291837045" miny="34.073413" maxx="123.42445031055" maxy="38.692566"/> One tip would be if you don't already have shapefiles, use a World data (built in open street map based raster layer) to define the zone you want to download... Draw a rectangular area over the zone and select it, then zoom to the desired scale (the scale you want your raster layer to be exported). Then export raster. In the options click on "Click here to calculate spacing in other units..." it opens a window, click on "Use current screen pixel size" and then "OK". Untick "Save vector data if displayed" if you don't want your rectangular area to appear. (If you do have vectors to export over the raster, leave the box ticked but hide the layer containing the rectangular area before exporting). One last thing, leave the projections by default (EPSG:4326)... I've tried with Gauss Kruger settings but it didn't work, best to download the raster in the native projection and then reproject it, i've tried with the city of Jinan for example, raster at 1:3000 scale (in EPSG:4326) and then reprojected to 3° Gauss Kruger (New Beijing CM 117E, EPSG:4796) which gave a nice image of 10000 x 5400 px at 78cm per pixel. So everything works fine. If it's not clear enough, ask. Cheers.
  14. What's the WMS server URL ? Do you have GDAL installed ?
  15. A new masterpiece from Greenpeace : http://www.intothearctic.gp/ The map is not tiled, it's a whopping PNG of 1950 x 2455 pixels : http://wac.7ce6.edgecastcdn.net/807CE6/intothearctic_gp/assets/images/mainMap.jpg (maybe the URL changes) There's only one javascript for everything (apart from a browser detection and a bugtracker script) so i guess everything is written from scratch and doesn't depend on some other libraries, unfortunately the code has been minified. It's worth a look.
  16. I would like to give you a follow up about Leaflet... Even if it sounds promising and easy on simple projects... as soon as you want to dig a little bit more and give it a more sophisticated use, you'll definitely run into problems. The project is crippled with what they call “minor” bugs... which i wouldn't call minor anyway, for example on webkit stock android browsers, there is an very obvious offset in tiles, which makes the map quite ugly. There is a fix, but which displays a one pixel line around the tiles... i wouldn't call that a fix either... I'm spending an awful amount of time to track the bugs, the community doesn't seem very tight... There are some open bugs without any answer or comment since 3 or 4 months... I'm sure the guys are doing the best they can, and i don't wanna underestimate their job or sound disrespectful... But believe me, if it's not just to display a simple map in a div, stick with OpenLayers... otherwise get ready to write a lot of code yourself ! It looks very promising, they've done a wonderful job altogether... but it's too soon to use it on complex projects if you're not a hardcore JS coder.
  17. Have a look at this : http://opentripplanner.com/ And read this : http://wiki.openstreetmap.org/wiki/Routing/online_routers
  18. Yes Global Mapper is the simplest way... but it's not very flexible and in lots of cases it just doesn't do the job (WMS-C with custom resolutions, also lots of servers restricts tiles to 256px size, etc.) It would be nice to be able to control the scales, resolutions projections and tilesize... however it doesn't seem to be the priority of the developers. Another flaw : it's also very slow (MOBAC uses various threads to download simultaneous tiles). In my opinion GDAL is the best.
  19. I've been comparing leaflet and mapbox.js lately... both are very nice I'm exploring right now the possibility of serving mbtiles though a tilestream server using wax and mapbox.js. Very promising in terms of speed, design and functionalities. You may want to have a look : Tilemill's mbtiles format : http://mapbox.com/developers/mbtiles/ Tilestream server : https://github.com/mapbox/tilestream/blob/master/README.md Wax : http://mapbox.com/wax/ Mapbox.js : http://mapbox.com/mapbox.js/api/v0.6.7/
  20. Various solutions... such as Mobile Atlas Creator http://mobac.sourceforge.net/ (restricted to EPSG:4326), Global Mapper (restricted to 512 pixels tiles) and the most versatile : GDAL. Quite complicated since it's command line only, but supports all types of drivers and projections, even with tiled services : http://www.gdal.org/frmt_wms.html
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