miscalculation of distance calculation of dbgeography - sql

Question

I am using EF with a MSSQL DB and I am struggling with a spatial query:
I am using the user location to search for restaurants ordered by distance here is the code:
DbGeography userLocation = DbGeography.FromText(userLocationWKT, 4326);
return (from branch in DbContext.Branches
let distance = userLocation.Distance(branch.Location)
orderby distance ascending
where branch.Name.ToLower().Contains(searchString.ToLower()) && branch.Location != null
select new BranchAndDistance { Branch = branch, Distance = distance }).ToList();
the user location WKT is POINT (32.78786115814 35.0162102747709). In my test case I am sending a query that returns one restaurant with Lat=32.1300848 & Long=34.7919443 But the distance I am getting is 370237 meters which is way off.
The next image shows the QuickWatch window for the restaurant location details:
Notice that in the ProviderValue text it shows POINT (34.7919443 32.1300848) as if it replaces the Lat and Long but the actual values seem OK
So I conducted some more tests, since I am holding the lat and long values in separate variables I could test the following:
double? distance = Branch.Location.Distance(userLocation);
DbGeography branchLocation = DbGeography.FromText(string.Format("POINT ({0} {1})",
Branch.Latitude,.Branch.Longitude), 4326);
double? distance2 = branchLocation.Distance(userLocation);
The distance variable had the same incorrect distance value of 370237.85926851362
but the distance2 variabel had the correct distance value of 65061.945208184392
How can this be?
I have also checked in the SQL Azure database managment and according to that the Location property (which yields an incorrect distance result) is spot on
Have I missed something? What am I doing wrong???

Answer 1

Your WKT for your user is not what you think it is. Specifically, that is a point that has (latitude, longitude) = (35.0162102747709, 32.78786115814). Here's a little T-SQL to show that:
DECLARE #g geography;
SELECT #g = geography::STPointFromText('POINT (32.78786115814 35.0162102747709)', 4326);
SELECT #g.Lat, #g.Long;