Class: RasterReprojector
Defined in: delatin.ts:143
RasterReprojector performs a Delaunay triangulation-based reprojection of a raster image.
It takes as input a set of functions to associate pixel positions with coordinates in the input and output CRS, as well as the dimensions of the output image, and it produces a triangulated mesh that can be used to reproject the input raster onto the output raster with bounded error.
Constructors
Constructor
new RasterReprojector(
reprojectors,width,height?,options?):RasterReprojector
Defined in: delatin.ts:208
Parameters
reprojectors
width
number
height?
number = width
options?
_errorSpace?
"input" | "output"
Where each test point's error is measured.
"input"(default): in input pixels. The GPU's position for the test point is mapped back to the input space with the inverse functions, and the error is its distance from the test point. This is similar to gdalwarp's linear approximator."output": in output pixels. The error is the distance on the map between where the test point belongs and where the GPU draws it, then divided by one input pixel's size on the map at the center of the meshed area, or across it where the pixel at the center has no size. So the unit ofmaxErroris still a number of pixels. The inverse functions are never called.
This option is experimental and may change or be removed.
initialTriangulation?
Returns
RasterReprojector
Properties
exactOutputPositions
exactOutputPositions:
number[]
Defined in: delatin.ts:163
XY Positions in output CRS, computed via exact forward reprojection.
height
height:
number
Defined in: delatin.ts:150
Height of the image in pixels
reprojectors
reprojectors:
ReprojectionFns
Defined in: delatin.ts:144
triangles
triangles:
number[]
Defined in: delatin.ts:168
triangle vertex indices
uvs
uvs:
number[]
Defined in: delatin.ts:158
UV vertex coordinates (x, y), i.e. [x0, y0, x1, y1, ...]
These coordinates are floats that range from [0, 1] in both X and Y.
width
width:
number
Defined in: delatin.ts:147
Width of the image in pixels
Methods
getMaxError()
getMaxError():
number
Defined in: delatin.ts:323
Returns
number
refine()
refine():
void
Defined in: delatin.ts:317
Returns
void
run()
run(
maxError?,maxIterations?):void
Defined in: delatin.ts:294
Refine the mesh until its maximum error gets below the given one
Parameters
maxError?
number = DEFAULT_MAX_ERROR
The maximum error the mesh should achieve, in pixels: input pixels, or in output mode, output pixels (one input pixel's size on the map, normally at the center of the meshed area).
maxIterations?
Optional safeguard to prevent infinite loops in case of non-convergence. If the mesh fails to converge within this number of iterations, a warning will be logged and the function will return early.
maxIterations?
number = 10000
Returns
void
[return description]