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Distance units

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Distance units

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Whenever distances need to be specified, e.g. for a geo distance query, the distance unit can be specified as a double number representing distance in meters, as a new instance of a Distance, or as a string of the form number and distance unit e.g. "2.72km"

NEST uses a Distance type to strongly type distance units and there are several ways to construct one.

Constructor

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The most straight forward way to construct a Distance is through its constructor

var unitComposed = new Distance(25);
var unitComposedWithUnits = new Distance(25, Nest.DistanceUnit.Meters);

Distance serializes to a string composed of a factor and distance unit. The factor is a double so always has at least one decimal place when serialized

Expect("25.0m")
    .WhenSerializing(unitComposed)
    .WhenSerializing(unitComposedWithUnits);

Implicit conversion

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Alternatively a distance unit string can be assigned to a Distance, resulting in an implicit conversion to a new Distance instance. If no DistanceUnit is specified, the default distance unit is meters

Distance distanceString = "25";
Distance distanceStringWithUnits = "25m";

Expect("25.0m")
    .WhenSerializing(distanceString)
    .WhenSerializing(distanceStringWithUnits);

Supported units

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A number of distance units are supported, from millimeters to nautical miles

Metric

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mm (Millimeters)

Expect("2.0mm").WhenSerializing(new Distance(2, Nest.DistanceUnit.Millimeters));

cm (Centimeters)

Expect("123.456cm").WhenSerializing(new Distance(123.456, Nest.DistanceUnit.Centimeters));

m (Meters)

Expect("400.0m").WhenSerializing(new Distance(400, Nest.DistanceUnit.Meters));

km (Kilometers)

Expect("0.1km").WhenSerializing(new Distance(0.1, Nest.DistanceUnit.Kilometers));

Imperial

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in (Inches)

Expect("43.23in").WhenSerializing(new Distance(43.23, Nest.DistanceUnit.Inch));

ft (Feet)

Expect("3.33ft").WhenSerializing(new Distance(3.33, Nest.DistanceUnit.Feet));

yd (Yards)

Expect("9.0yd").WhenSerializing(new Distance(9, Nest.DistanceUnit.Yards));

mi (Miles)

Expect("0.62mi").WhenSerializing(new Distance(0.62, Nest.DistanceUnit.Miles));

nmi or NM (Nautical Miles)

Expect("45.5nmi").WhenSerializing(new Distance(45.5, Nest.DistanceUnit.NauticalMiles));

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