constants library

Epsilon, geodetic and screen related constants.

This libary exports a subset of package:geobase/geobase.dart.

Usage: import package:geobase/constants.dart

Constants

defaultEpsilon → const double

The default epsilon value 1.0e-9 used as a tolerance in equals2D, equals3D and similar methods in this package.

1.0e-9

doublePrecisionEpsilon → const double

The maximum relative precision of double numbers (IEEE 754).

2.220446049250313e-16

earthCircumferenceWgs84 → const double

The earth circumference in meters (from earth equatorial radius by WGS 84).

2 * math.pi * earthRadiusWgs84

earthRadiusWgs84 → const double

The earth equatorial radius in meters as specified by WGS 84.

6378137.0

maxLatitude → const double

The maximum value for the geographic latitude.

90.0

maxLatitudeWebMercator → const double

The maximum value for the geographic latitude inside the Web Mercator projection coverage.

85.05112878

maxLongitude → const double

The maximum value for the geographic longitude.

180.0

minLatitude → const double

The minimum value for the geographic latitude.

-90.0

minLatitudeWebMercator → const double

The minimum value for the geographic latitude inside the Web Mercator projection coverage.

-85.05112878

minLongitude → const double

The minimum value for the geographic longitude.

-180.0

screenPPIbyOGC → const double

OGC defines a screen pixel of 0.28 mm that approximates to 90.7 ppi.

0.0254 / 0.00028