# Class EquirectangularTools_F64

java.lang.Object
boofcv.alg.distort.spherical.EquirectangularTools_F64

public class EquirectangularTools_F64 extends Object
Contains common operations for handling coordinates in an equirectangular image. On most globes, a positive latitude corresponds to the north pole, or up, and negative towards the south pole. Images have 0 on the top and increase downwards. To compensate for this the y-axis can be flipped. This is indicated by functions with FV (flip vertical) on the end of their name. Coordinate System:
• longitude is along the x-axis and goes from -pi to pi
• latitude is along the y-axis and goes from -pi/2 to pi/2
• image center (width/2, (height-1)/2.0f) or (lat=0, lon=0) corresponds to a unit sphere of (1,0,0)
• unit sphere of (0,0,1) is pixel (width/2,0) and (0,0,-1) is (width/2,height-1)
• unit sphere of (0,1,0) is pixel (3*width/4,(height-1)/2) and (0,0,-1) is (width/4,(height-1)/2)
Coordinate System with y-flipped:
• longitude is along the x-axis and goes from -pi to pi
• latitude is along the y-axis and goes from pi/2 to -pi/2
• image center (width/2, height/2) or (lat=0, lon=0) corresponds to a unit sphere of (1,0,0)
• unit sphere of (0,0,1) is pixel (width/2,height-1) and (0,0,-1) is (width/2,0)
• unit sphere of (0,1,0) is pixel (3*width/4,(height-1)/2) and (0,0,-1) is (width/4,(height-1)/2)

Latitude and Longitude shown on a sphere in equirectangular format. Note that y is NOT flipped and angles are shown in degrees not radians git push.

• ## Constructor Summary

Constructors
Constructor
Description
`EquirectangularTools_F64()`

• ## Method Summary

Modifier and Type
Method
Description
`void`
```configure(int width, int height)```
Specifies the image and which latitude/longtiude will comprise the center axises
`void`
```equiToLatLon(double x, double y, GeoLL_F64 geo)```
Converts the equirectangular coordinate into a latitude and longitude
`void`
```equiToLatLonFV(double x, double y, GeoLL_F64 geo)```
Converts the equirectangular coordinate into a latitude and longitude.
`void`
```equiToNorm(double x, double y, Point3D_F64 norm)```
Converts equirectangular into normalized pointing vector
`void`
```equiToNormFV(double x, double y, Point3D_F64 norm)```

`int`
`getHeight()`

`int`
`getWidth()`

`void`
```latlonToEqui(double lat, double lon, Point2D_F64 rect)```
Convert from latitude-longitude coordinates into equirectangular coordinates
`void`
```latlonToEquiFV(double lat, double lon, Point2D_F64 rect)```
Convert from latitude-longitude coordinates into equirectangular coordinates.
`void`
```normToEqui(double nx, double ny, double nz, Point2D_F64 rect)```

`void`
```normToEquiFV(double nx, double ny, double nz, Point2D_F64 rect)```

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
• ## Constructor Details

• ### EquirectangularTools_F64

public EquirectangularTools_F64()
• ## Method Details

• ### configure

public void configure(int width, int height)
Specifies the image and which latitude/longtiude will comprise the center axises
Parameters:
`width` - Image width
`height` - Image height
• ### equiToNorm

public void equiToNorm(double x, double y, Point3D_F64 norm)
Converts equirectangular into normalized pointing vector
Parameters:
`x` - pixel coordinate in equirectangular image
`y` - pixel coordinate in equirectangular image
`norm` - Normalized pointing vector
• ### normToEqui

public void normToEqui(double nx, double ny, double nz, Point2D_F64 rect)
• ### equiToNormFV

public void equiToNormFV(double x, double y, Point3D_F64 norm)
• ### normToEquiFV

public void normToEquiFV(double nx, double ny, double nz, Point2D_F64 rect)
• ### equiToLatLon

public void equiToLatLon(double x, double y, GeoLL_F64 geo)
Converts the equirectangular coordinate into a latitude and longitude
Parameters:
`x` - pixel coordinate in equirectangular image
`y` - pixel coordinate in equirectangular image
`geo` - (output)
• ### equiToLatLonFV

public void equiToLatLonFV(double x, double y, GeoLL_F64 geo)

Converts the equirectangular coordinate into a latitude and longitude. Vertical equirectangular axis has been flipped

y' = height - y - 1
Parameters:
`x` - pixel coordinate in equirectangular image
`y` - pixel coordinate in equirectangular image
`geo` - (output)
• ### latlonToEqui

public void latlonToEqui(double lat, double lon, Point2D_F64 rect)
Convert from latitude-longitude coordinates into equirectangular coordinates
Parameters:
`lat` - Latitude
`lon` - Longitude
`rect` - (Output) equirectangular coordinate
• ### latlonToEquiFV

public void latlonToEquiFV(double lat, double lon, Point2D_F64 rect)
Convert from latitude-longitude coordinates into equirectangular coordinates. Vertical equirectangular axis has been flipped
Parameters:
`lat` - Latitude
`lon` - Longitude
`rect` - (Output) equirectangular coordinate
• ### getWidth

public int getWidth()
• ### getHeight

public int getHeight()