Interface: GeoProjection
A geographic projection.
Hierarchy
GeoProjection
Methods
getCenter
▸ getCenter(): GeoPointReadOnly
Gets the geographic center of this projection.
Returns
The geographic center of this projection.
Defined in
src/sdk/geo/GeoProjection.ts:15
getPostRotation
▸ getPostRotation(): number
Gets the post-projection (planar) rotation angle of this projection in radians.
Returns
number
The post-projection rotation angle of this projection.
Defined in
src/sdk/geo/GeoProjection.ts:50
getPreRotation
▸ getPreRotation(): Readonly<Omit<Float64Array, "set" | "sort" | "copyWithin">>
Gets the pre-projection (spherical) rotation of this projection as a vector [lambda, phi, gamma]. The rotation
angles are expressed in radians. The full rotation is an intrinsic rotation with angles applied in the order
lambda, phi, gamma. The rotation uses the standard geographic cartesian coordinate system, a right-handed
coordinate system with the origin at the center of the earth, the positive x axis passing through 0 degrees N,
0 degrees E, and the positive z axis passing through the North Pole.
lambda: Intrinsic rotation angle about the z axis. Positive rotation is in the counterclockwise direction when looking down from above the axis.phi: Intrinsic rotation angle about the y axis. Positive rotation is in the clockwise direction when looking down from above the axis.gamma: Intrinsic rotation angle about the x axis. Positive rotation is in the counterclockwise direction when looking down from above the axis.
Returns
Readonly<Omit<Float64Array, "set" | "sort" | "copyWithin">>
The pre-projection rotation of this projection.
Defined in
src/sdk/geo/GeoProjection.ts:38
getReflectY
▸ getReflectY(): boolean
Checks whether this projection reflects the projected coordinate system across the x-axis.
Returns
boolean
Whether this projection reflects the projected coordinate system across the x-axis.
Defined in
src/sdk/geo/GeoProjection.ts:56
getScaleFactor
▸ getScaleFactor(): number
Gets the nominal scale factor of this projection. At a scale factor of 1, a distance of one great-arc radian will be projected to a distance of one pixel.
Returns
number
The nominal scale factor of this projection.
Defined in
src/sdk/geo/GeoProjection.ts:22
getTranslation
▸ getTranslation(): Readonly<Omit<Float64Array, "set" | "sort" | "copyWithin">>
Gets the post-projection (planar) translation of this projection, in pixels.
Returns
Readonly<Omit<Float64Array, "set" | "sort" | "copyWithin">>
The post-projection translation of this projection.
Defined in
src/sdk/geo/GeoProjection.ts:44
invert
▸ invert<T>(vec, out): T
Inverts a set of projected coordinates. This method will determine the geographic point whose projected location is the equal to that described by a 2D position vector.
Type parameters
| Name | Type |
|---|---|
T | extends Float64Array | GeoPoint |
Parameters
| Name | Type | Description |
|---|---|---|
vec | Readonly<Omit<Float64Array, "set" | "sort" | "copyWithin">> | The 2D position vector describing the location of the projected coordinates. |
out | T | The point to which to write the result. |
Returns
T
the inverted point.
Defined in
src/sdk/geo/GeoProjection.ts:73
project
▸ project(point, out): Float64Array
Projects a set of lat/lon coordinates.
Parameters
| Name | Type | Description |
|---|---|---|
point | Readonly<Omit<Float64Array, "set" | "sort" | "copyWithin">> | LatLonInterface | The point to project, as either a LatLonInterface or a [lon, lat] array. |
out | Float64Array | The vector to which to write the result. |
Returns
Float64Array
The projected point, as a vector.
Defined in
src/sdk/geo/GeoProjection.ts:64