VisiOmatic web client: WCS

new WCS(header, images, optionsopt) → {WCS}

Create a new coordinate reference system that emulates the WCS (World Coordinate System) used in astronomy.

Parameters

header object
JSON representation of the merged image header.
images Array.<image>
Array of image extension metadata.
options object <optional>

Options.

Properties
- nzoom number <optional>
  9
  Number of zoom levels.

Returns

WCS
Instance of a World Coordinate System.

Source

crs/WCS.js , line 80

Members

static

code

Codename of the WCS coordinate reference system.

Default Value

Source

crs/WCS.js , line 58

Methods

static

_deltaLng(latLng, latLng0) → {number}

Compute the longitude of a point with respect to a reference point.

Parameters

latLng leaflet.LatLng
World coordinates of the point.
latLng0 leaflet.LatLng
World coordinates of the reference point.

Returns

number
Difference in longitude (in degrees) in the interval -180 to 180 deg.

Source

crs/WCS.js , line 485

static

distance(latlng1, latlng2) → {number}

Compute the distance between two points on the sphere.

Parameters

latlng1 leaflet.LatLng
World coordinates of the first point.
latlng2 leaflet.LatLng
World coordinates of the second point.

Returns

number
Spherical distance between the two points in degrees.

Source

crs/WCS.js , line 369

static

fovToZoom(map, fov, latlng) → {number}

Compute the zoom level that corresponds to a given FoV at the provided coordinates.

Parameters

map leaflet.Map
Leaflet map.
fov number
Field of View in degrees.
latlng leaflet.LatLng
World coordinates.

Returns

number
Zoom level.

Source

crs/WCS.js , line 338

static

getProjection(header, optionsopt) → {string}

Extract the WCS projection code from a JSON-encoded image header.

Parameters

header object
JSON representation of the image header.
options object <optional>

Projection options.

Returns

string
WCS projection code.

Source

crs/WCS.js , line 239

static

hmsDMSToLatLng(Coordinate) → {leaflet.LatLng|undefined}

Convert an HMSDMS string to world coordinates.

Parameters

Coordinate string
string in HMSDMS.

Returns

leaflet.LatLng undefined
World coordinates, or undefined if the input string could not be translated.

Source

crs/WCS.js , line 458

static

latLngToHMSDMS(latlng) → {string}

Convert world coordinates to an HMSDMS string (DMS code from the Leaflet-Coordinates plug-in).

Parameters

latlng leaflet.LatLng
Input world coordinates.

Returns

string
Coordinate string in HMSDMS.

Source

crs/WCS.js , line 410

static

multiLatLngToIndex(latlng) → {number}

Return index of chip closest to the given world coordinates in a multi-WCS setting.

Parameters

latlng leaflet.LatLng
Input world coordinates.

Returns

number
Index of the closest chip (extension).

Source

crs/WCS.js , line 210

static

multiLatLngToPoint(latlng, zoom) → {leaflet.Point}

Multi-WCS version of the projection to layer coordinates.

Parameters

latlng leaflet.LatLng
Input world coordinates.
zoom number
Zoom level.

Returns

leaflet.Point
Layer coordinates at the given zoom level.

Source

crs/WCS.js , line 163

static

multiPntToIndex(pnt) → {number}

Return index of chip closest to the given pixel coordinates in a multi-WCS setting.

Parameters

pnt leaflet.Point
Input (merged) pixel coordinates.

Returns

number
Index of the closest chip (extension).

Source

crs/WCS.js , line 220

static

multiPointToLatLng(pnt, zoom) → {leaflet.LatLng}

Multi-WCS version of the de-projection from layer coordinates.

Parameters

pnt leaflet.Point
Input layer coordinates at the given zoom level.
zoom number
Zoom level.

Returns

leaflet.LatLng
De-projected world coordinates.

Source

crs/WCS.js , line 176

static

multiProject(latlng) → {leaflet.Point}

Multi-WCS astrometric projection.

Parameters

latlng leaflet.LatLng
Input world coordinates.

Returns

leaflet.Point
Projected (merged) pixel coordinates.

Source

crs/WCS.js , line 185

static

multiUnproject(pnt) → {leaflet.LatLng}

Multi-WCS version of the astrometric de-projection.

Parameters

pnt leaflet.Point
Input (merged) pixel coordinates.

Returns

leaflet.LatLng
De-projected world coordinates.

Source

crs/WCS.js , line 198

static

parseCoords(str) → {leaflet.LatLng|undefined}

Parse a string of world coordinates.

Parameters

str string
Input string.

Returns

leaflet.LatLng undefined
World coordinates, or undefined if conversion failed.

Source

crs/WCS.js , line 388

static

pixelScale(zoom, latlng) → {number}

Compute the layer pixel scale at the given world coordinates.

Parameters

zoom number
Zoom level.
latlng leaflet.LatLng
World coordinates.

Returns

number
Layer pixel scale (in degrees per pixel).

Source

crs/WCS.js , line 326

static

rawPixelScale(latlng) → {number}

Compute the image pixel scale at the given world coordinates.

Parameters

latlng leaflet.LatLng
World coordinates.

Returns

number
Pixel scale (in degrees per pixel).

Source

crs/WCS.js , line 303

static

scale(zoom) → {number}

Convert zoom level to relative scale.

Parameters

zoom number
Zoom level.

Returns

number
Relative scale.

Source

crs/WCS.js , line 284

static

transform(pnt, zoom) → {leaflet.Point}

Convert pixel (image) coordinates to layer coordinates.

Parameters

pnt leaflet.Point
Pixel coordinates.
zoom number
Zoom level.

Returns

leaflet.Point
Layer coordinates at the given zoom level.

Source

crs/WCS.js , line 140

static

untransform(layerpnt, zoom) → {leaflet.Point}

Convert layer coordinates to pixel (image) coordinates.

Parameters

layerpnt leaflet.Point
Layer coordinates.
zoom number
Zoom level.

Returns

leaflet.Point
Pixel (image) coordinates

Source

crs/WCS.js , line 152

static

zoom(scale) → {number}

Convert relative scale to zoom level.

Parameters

scale number
Relative scale.

Returns

number
Zoom level.

Source

crs/WCS.js , line 294

static

zoomToFov(map, zoom, latlng) → {number}

Compute the FoV that corresponds to a given zoom level at the provided coordinates.

Parameters

map leaflet.Map
Leaflet map.
zoom number
Zoom level.
latlng leaflet.LatLng
World coordinates.

Returns

number
Field of View in degrees.

Source

crs/WCS.js , line 355