Parse API - how do I narrow down results? - xamarin.ios

Question

I am using the following code to get the locations for the nearest clinics in kms the code works sweet. But what I cant understand is how to get around the parse object only returning 100 objects so I guess my question should be how do i return just a subset that match the current long and lat of the clinics.
I call the below functions in my viewdIdLoadMethod
List<Clinics> _clicics;
_clicics =GetAllNearestFamousPlaces (54.269412, -0.93399086);
public List<Clinics> GetAllNearestFamousPlaces(double currentLatitude,double currentLongitude)
{
List<Clinics> Caldistance = new List<Clinics>();
var query = ParseObject.GetQuery("clinics");
query.FindAsync().ContinueWith(t =>
{
IEnumerable<ParseObject> results = t.Result;
foreach (var obj in results)
{
double distance = Distance(currentLatitude, currentLongitude, obj.Get<double>("lat"), obj.Get<double>("long"));
if (distance < 25) //nearbyplaces which are within 25 kms
{
Clinics dist = new Clinics();
dist.Name = obj.Get<string>("Name");
dist.Latitute = obj.Get<double>("lat");
dist.Longitude =obj.Get<double>("long");
Caldistance.Add(dist);
}
}
});
return Caldistance;
}
private double Distance(double lat1, double lon1, double lat2, double lon2)
{
double theta = lon1 - lon2;
double dist = Math.Sin(deg2rad(lat1)) * Math.Sin(deg2rad(lat2)) + Math.Cos(deg2rad(lat1)) * Math.Cos(deg2rad(lat2)) * Math.Cos(deg2rad(theta));
dist = Math.Acos(dist);
dist = rad2deg(dist);
dist = (dist * 60 * 1.1515) / 0.6213711922; //miles to kms
return (dist);
}
private double deg2rad(double deg)
{
return (deg * Math.PI / 180.0);
}
private double rad2deg(double rad)
{
return (rad * 180.0 / Math.PI);
}

Answer 1

This may not be syntactically correct - I don't actually use Parse so I'm guessing based on their docs
// assume your point of origin is 54.269412, -0.93399086
// each degree of lat/long is **roughly** 100 km so we'll fudge and +- .5 to narrow down the
// list of clinics
double lat = 54.269412;
double lng = -0.93399086;
double minLong = lng - 0.5;
double maxLong = lng + 0.5;
double minLat = lat - 0.5;
double maxLat = lat + 0.5;
var query = from clinic in ParseObject.GetQuery("clinics")
where clinic.Get<double>("lat") >= minLat
and clinic.Get<double>("lat") <= maxLat
and clinic.Get<double>("long") >= minLat
and clinic.Get<double>("long") <= maxLat
select clinic;
// 1000 is the max we can request at a time
query = query.Limit(1000);
// now execute your query to get the results, and then use your Distance() function to calculate
// the precise distance and remove results that are to far away, etc