wld-bbox

Convert between a Bounding Box and World File given a Raster Size

features

• No floating point arithmetic issues thanks to preciso

limitiations

• doesn't support skew (rotation around the x or y axis)

install

npm install wld-bbox

usage

forward: World File to Bounding Box

importconvert_world_file_to_bboxfrom"wld-bbox/forward";// or import { forward as convert_world_file_to_bbox } from "wld-bbox";constwld={xScale: "2445.9849051249894",ySkew: "0",xSkew: "0",yScale: "-2445.98490512499",xOrigin: "7699959.850241235",yOrigin: "1323859.6754601842"};constsize={height: 475,width: 968};constbbox=convert_world_file_to_bbox({ wld, size });// bbox is a super-precise bounding box in [xmin, ymin, xmax, ymax] format// where the numbers are represented as strings for extra precision// because of the limitations of JavaScript floating point numbers// ex: Number("7698736.8577886725053") results in 7698736.857788673["7698736.8577886725053","163239.837978376445","10066450.2459496622445","1325082.667912746695"]// turn off high-precision and just use quicker floating point arithmeticconstbbox=convert_world_file_to_bbox({ wld, size,precise: false});[7698736.857788673,163239.83797837654,10066450.245949663,1325082.6679127468]

inverse: Bounding Box to World File

importconvert_bbox_to_world_filefrom"wld-bbox/inverse";// or import { inverse as convert_bbox_to_world_file } from "wld-bbox";convert_bbox_to_world_file({// a precise bounding box where numbers are represented by stringsbbox: ["7698736.8577886725053","163239.837978376445","10066450.2459496622445","1325082.667912746695"],precise: true,size: {height: 475,width: 968}});{xScale: '2445.9849051249894',yScale: '-2445.98490512499',ySkew: '0',xSkew: '0',xOrigin: '7698736.8577886725053',yOrigin: '1325082.667912746695'}// using numbers instead of precise numerical stringsconvert_bbox_to_world_file({bbox: [7698736.857788673,163239.83797837654,10066450.245949663,1325082.6679127468],precise: false,size: {height: 475,width: 968}});{xScale: 2445.9849051249903,yScale: -2445.98490512499,ySkew: 0,xSkew: 0,xOrigin: 7698736.857788673,yOrigin: 1325082.6679127468}

Reference

https://en.wikipedia.org/wiki/World_file

related

To read the data from a World File into an object, consider using wld-reader.