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/- or at 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. -- 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]. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
