geography

I have some data of coordinates that I recorded. Unfortunatelly they seem to be not realy good. They jump sometimes over the map. So now I´m searching for some flattening or filtering algorithm that would make the route look more realistic. Currently my only filter is to calculate the max possible meters travelled in a second (in bus or car or walking) and compare them with the coordinates, throwing those away, that are just not possible within a timeframe. So if a person can walk up to 2.5 meters in a second, and I have two coords that are 10 meters away from each other and they were recorded

I'm working with the new Entity-Framework 5 using the Spatial data type DbGeography as part of my model for storing in one instance, a POINT and in another instance a POLYGON. When setting the value of my POLYGON all saves with no error however this is only the case if I draw the Polygon on the map in a clockwise order. If I draw the POLGON in an anti-clockwise direction I get an error the the sql level indicating that the data is an invalid geography type. Now after doing my own research into the problem, it appears to stem from the geography data type being quite strict in terms of a

I am using Dundas Maps and attempting to draw a map of the world where countries are grouped into regions that are specific to a business implementation. I have shape data (points and segments) for each country in the world. I can combine countries into regions by adding all points and segments for countries within a region to a new region shape. foreach(var region in GetAllRegions()){ var regionShape = new Shape { Name = region.Name }; foreach(var country in GetCountriesInRegion(region.Id)){ var countryShape = GetCountryShape(country.Id); regionShape.AddSegments(countryShape.ShapeData.Points,

How can I convert some Geometry data into Geography data in MS SQL Server 2008? Yes you can but the geometry datatype is more forgiving than the geography in my experience. So there is some data you might have in geometry that you can't convert. This article from Spatial Ed was very helpful explaining how to fix data problems and also has some sample queries to convert from Geom to Geog. 来源： https://stackoverflow.com/questions/279983/how-can-i-convert-geometry-data-into-a-geography-data-in-ms-sql-server-2008

What's the best way to get a function like the following to work: def getNearest(zipCode, miles): That is, given a zipcode (07024) and a radius, return all zipcodes which are within that radius? There is a project on SourceForge that could assist with this: http://sourceforge.net/projects/zips/ It gives you a database with zip codes and their latitude / longitude, as well as coding examples of how to calculate the distance between two sets of coordinates. There is probably a better way to do it, but you could have your function retrieve the zipcode and its coordinates, and then step through

In PHP, I have the following code for calculating the distance between two locations: <?php function distance($lat1, $long1, $lat2, $long2) { // DEGREE TO RADIAN $latitude1 = $lat1/180*pi(); $longitude1 = $long1/180*pi(); $latitude2 = $lat2/180*pi(); $longitude2 = $long2/180*pi(); // FORMULA: e = ARCCOS ( SIN(Latitude1) * SIN(Latitude2) + COS(Latitude1) * COS(Latitude2) * COS(Longitude2-Longitude1) ) * EARTH_RADIUS $distance = acos(sin($latitude1)*sin($latitude2)+cos($latitude1)*cos($latitude2)*cos($longitude2-$longitude1))*6371; return $distance; } echo distance(9.9921962, 53.5534074, 9