Another data source - http://www.d-maps.com/pays.php?lib=burma_myanmar_maps&num_pay=73&lang=en
On Aug 29, 8:08 am, Grok Lobster <[email protected]> wrote: > I think you're doing something wrong. I looked at the (Myanmar) data > from the link I provided earlier and it lines up quite well with > Google and ESRI's ArcGIS Explorer. > > On Aug 29, 2:02 am, unxcolin <[email protected]> wrote: > > > > > Okay so I checked the data and it's all Mercator projection/World > > Geodetic System, so in theory they should be the same! > > > Obviously the official data, or Google data is inaccurate. > > > This really leaves me with two options - what would you guys > > recommend?: > > > 1. Get Googles data - although not to mention it potentially being > > impossible to come by, however I'd also need the data of the 330 > > constituencies which Google almost certainly doesn't have. > > > 2. Use the data I have and create a custom map visual to overlay my > > data on, drawn from the same country border data I have (this would > > literally only need to be an outline of Burma filled in one colour and > > the background another) - is this possible/easy? - any links to > > examples of this using v3? > > > There's obviously also the issue that if I map Burma, the 14 states > > and divisions and the 330 constituencies which would all run to the > > hundreds of thousands of points. So I'll need to run the data through > > an algorithm to reduce the points. I read that the Douglas-Peucker > > algorithm isn't great for polygons? Anybody know if there is an > > algorith that works well with polygons? > > > Thanks. > > > On Aug 24, 4:59 pm, Nathan Raley <[email protected]> wrote: > > > >http://code.google.com/apis/maps/documentation/javascript/maptypes.ht... > > > <http://code.google.com/apis/maps/documentation/javascript/maptypes.ht...>Goes > > > into a very detailed explanation of the projection Google uses to display > > > their maps. > > > > It is a Mercator projection, but you can find a very detailed explanation > > > at > > > the link there and with further research you can see how exactly they go > > > about displaying the map, as well as the benefits and downfalls to using > > > Mercator projection. > > > > But basically what it boils down to is that any map projection is taking > > > the > > > earth, which is not flat, and trying to flatten it out to display it to > > > you > > > on a map. Every projection has its benefits as well as downfalls. Read > > > up > > > on that and you can have a better understanding of the projection Google > > > uses. > > > > On Mon, Aug 23, 2010 at 11:13 AM, unxcolin > > > <[email protected]>wrote: > > > > > Thanks for the replies. > > > > > Yes the data is fromhttp://www.diva-gis.org/-orat least it's the > > > > same as this data. Not sure what projection the data I have is but it > > > > seems to be standard across all official sources, is this different to > > > > what Google use? > > > > > I've spoken to a Burmese geospatial mapping guy and he said Google > > > > Maps is not technically accurate, is this correct? What projection is > > > > Google maps? > > > > > I mean if you look down the south of Burma in the example there are > > > > many small islands that exist on the overlay that are not even on > > > > Google maps? And to the east of Yangoon at the coast the map is > > > > nowhere near! > > > > > On Aug 23, 3:37 pm, Grok Lobster <[email protected]> wrote: > > > > > Try the data from here,http://www.diva-gis.org/ > > > > > > On Aug 23, 5:28 am, unxcolin <[email protected]> wrote: > > > > > > > Hi, > > > > > > > I'm trying to overlay a polygon of Burma, and it's states using the > > > > > > official data provided my numerous organisations (inc. the > > > > > > "government"). > > > > > > > However this data when overlayed isn't really anywhere near what > > > > > > Google Maps has marked on the map, and is specifically misaligned > > > > > > when > > > > > > zoomed right in. Is there any way to resolve this, is there a known > > > > > > algorithm I need to run my data through which will fit it to Googles > > > > > > borders, do Google make their border data available for public use? > > > > > > > Example:http://bit.ly/d22gZo > > > > > > > Thanks, > > > > > > > Colin > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups > > > > "Google Maps JavaScript API v3" group. > > > > To post to this group, send email to > > > > [email protected]. > > > > To unsubscribe from this group, send email to > > > > [email protected]<google-maps-js-api-v3%2B > > > > [email protected]> > > > > . > > > > For more options, visit this group at > > > >http://groups.google.com/group/google-maps-js-api-v3?hl=en.-Hide quoted > > > >text - > > > - Show quoted text -- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. 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