@iota/area-codes

IOTA Area Codes (IAC)

IACs are a method for tagging IOTA transactions with a geo-location, which allows them to be fetched based on their location. IACs are currently based on Open Location Codes, also known as Plus codes, which were created by Google Zurich in 2014. For a more detailed explanation of IACs, please read ./docs/iota-area-codes.md

This package contains a JavaScript implementation of IOTA Area Codes (IAC) as proposed here by Lewis Freiberg.

Installing

Install this package using the following commands:

npm install @iota/area-codes

or

yarn add @iota/area-codes

Example Usage

const iotaAreaCodes = require('@iota/area-codes');

const iac = iotaAreaCodes.encode(52.529562, 13.413047);
console.log("IOTA Area Code", iac);

const iacHighPrecision = iotaAreaCodes.encode(52.529562, 13.413047, iotaAreaCodes.CodePrecision.EXTRA);
console.log("IOTA Area Code High Precision", iacHighPrecision);

const codeArea = iotaAreaCodes.decode('NPHTQORL9XKP');
console.log("IOTA Code Area", codeArea);

const olc = iotaAreaCodes.toOpenLocationCode('NPHTQORL9XKP');
console.log("Open Location Code", olc);

const iac2 = iotaAreaCodes.fromOpenLocationCode('X4HM+MM');
console.log("IOTA Area Code", iac2);

const isValid1 = iotaAreaCodes.isValid('JAHAS0');
console.log("isValid1", isValid1);

const isValid2 = iotaAreaCodes.isValid('NPHTQORL9XKP');
console.log("isValid2", isValid2);

const isValidPartial1 = iotaAreaCodes.isValidPartial('JAHAS');
console.log("isValidPartial1", isValidPartial1);

const isValidPartial2 = iotaAreaCodes.isValidPartial('NPAAAAAA9');
console.log("isValidPartial2", isValidPartial2);

const extracted = iotaAreaCodes.extract('NPHTQORL9XKP999999999');
console.log("extracted", extracted);

const dimensions = iotaAreaCodes.getPrecisionDimensions(4);
console.log("dimensions", dimensions);

const increasePrecision1 = iotaAreaCodes.increasePrecision('NPHTQORL9');
console.log("increasePrecision1", increasePrecision1);

const decreasePrecision1 = iotaAreaCodes.decreasePrecision('NPHTQORL9');
console.log("decreasePrecision1", decreasePrecision1);

const setPrecision1 = iotaAreaCodes.setPrecision('NPHTQORL9', 4);
console.log("setPrecision", setPrecision1);

Will output:

IOTA Area Code NPHTQORL9XK
IOTA Area Code High Precision NPHTQORL9XKP
IOTA Code Area {
  latitude: 52.52956250000001,
  longitude: 13.413046874999981,
  codePrecision: 11,
  latitudeLow: 52.529550000000015,
  latitudeHigh: 52.529575000000015,
  longitudeLow: 13.413031249999982,
  longitudeHigh: 13.413062499999983
}
Open Location Code 9F4MGCH7+R6F
IOTA Area Code ZHRT9TT
isValid1 false
isValid2 true
isValidPartial1 false
isValidPartial2 true
extracted NPHTQORL9XKP
dimensions {
  blocksSizeDegrees: 1,
  blocksSizeDegreesFormatted: "1°",
  sizeMetres: 110000,
  sizeMetresFormatted: "110km"
}
increasePrecision1 NPHTQORL9QP
decreasePrecision1 NPHTQOAA9
setPrecision NPHTAAAA9

API Reference

See the API reference for the Javascript implementation here.

Examples

To see the IACs in actions a demonstration application using this library can be found in the ./examples/ folder. This example is deployed to https://iota-poc-area-codes.dag.sh if you'd like to simply test it.

License

MIT License - Copyright (c) 2019 IOTA Stiftung

Changelog

v0.1.1

• isValid now uses OLC.isFull instead of OLC.isValid for checking Open Location Codes