DataServiceProtocolVersion<\/span>.V3;
}\n<\/p>\nThat’s it. Geospatial data values are just primitive data values like any other. It requires as little effort to use them as it does to use a DateTime.\n<\/p>\n
Writing the client\n<\/h2>\n
Just use Add Service Reference to codegen a client. Consuming geospatial data is no different than consuming any other V3 OData service.\n<\/p>\n
Reading and writing geospatial values\n<\/h2>\n
There’s nothing special about geospatial values. For example, to update your last known location, you would query for your User entity, set the value of its LastKnownLocation, and call SaveChanges().\n<\/p>\n
Enabling geo.distance queries\n<\/h2>\n
This sample service is interesting because it allows users to find nearby friends and businesses. We want to write queries that filter or orderby geo.distance().\n<\/p>\n
Unfortunately, the October CTP does not include an in-memory implementation for distance. Computing distance on a round earth is complicated. You’ll need to find a good implementation for this operation (Sql Server has such an implementation). Once you have it, you can use the following glue code to hook it up.\n<\/p>\n
public<\/span>\n\t\tstatic<\/span>\n\t\tvoid<\/span> InitializeService(DataServiceConfiguration config)
{
\n\t\t\/\/ …<\/span><\/p>\n \/\/ Register my operations<\/span>
\n\t\t<\/span>SpatialOperations.Register(2.0, new<\/span> MyOperations());
}<\/p>\ninternal<\/span>\n\t\tclass<\/span> MyOperations : SpatialOperations
{
\n\t\tpublic<\/span>\n\t\toverride<\/span>\n\t\tdouble<\/span> Distance(Geometry operand1, Geometry operand2)
{
\n\t\t\/\/ TODO: Put your code here.<\/strong><\/span>
<\/span>\n\t\tthrow<\/span>\n\t\tnew<\/span>\n\t\tNotImplementedException<\/strong><\/span>();
}<\/p>\n\t\tpublic<\/span>\n\t\toverride<\/span>\n\t\tdouble<\/span> Distance(Geography operand1, Geography operand2)
{
\n\t\t\/\/ <\/span>TODO: Put your code here.
\n\t\tthrow<\/span>\n\t\tnew<\/span> NotImplementedException();
}
}\n<\/p>\nMaking a distance query\n<\/h2>\n
Now that you’ve got a service that supports geo.distance(), we want to query it. Here are a couple of queries we can run:\n<\/p>\n
var<\/span> localStuff = new<\/span>\n\t\tLocalStuff<\/span>(new<\/span>\n\t\tUri<\/span>(“http:\/\/localhost\/LocalStuff.svc”<\/span>, UriKind<\/span>.Absolute));<\/p>\nvar<\/span> me = localStuff.Users.First(u => u.Username == “Chang”<\/span>);<\/p>\nvar<\/span> myNearbyFriends = me.Friends
.Where(friend => friend.LastKnownLocation.Distance(me.LastKnownLocation) < 1000.0);
var<\/span> moviesNearMe = localStuff.Businesses
.Where(b => b.Description.Contains(“movie”<\/span>))
.OrderBy(b => b.Location.Distance(me.LastKnownLocation))
.Take(3);\n<\/p>\nHave fun with the new geospatial data features. Please provide any feedback on the OData.org mailing list.<\/p>\n","protected":false},"excerpt":{"rendered":"
This CTP of WCF Data Services adds support for geospatial data. The release allows use of all of the OData geospatial data types and the geo.distance() canonical function. This enables two key scenarios: Read and write geospatial data (all types supported by Sql Server 2008 R2). Find all entities (i.e. coffee shops) near a location. […]<\/p>\n","protected":false},"author":512,"featured_media":3253,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[35,78],"class_list":["post-833","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-odata","tag-geospatial","tag-wcf-data-services"],"acf":[],"blog_post_summary":"
This CTP of WCF Data Services adds support for geospatial data. The release allows use of all of the OData geospatial data types and the geo.distance() canonical function. This enables two key scenarios: Read and write geospatial data (all types supported by Sql Server 2008 R2). Find all entities (i.e. coffee shops) near a location. […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/posts\/833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/users\/512"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/comments?post=833"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/posts\/833\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/media\/3253"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/media?parent=833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/categories?post=833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/odata\/wp-json\/wp\/v2\/tags?post=833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}