Convert symbology

Convert between letter based symbol identification codes (SIDC) and number based SIDCs (MILSTD 2525C ↔ 2525D / APP-6 C ↔ D ). The mappings from 2525C to 2525D are based on data from the Joint Military Symbology Markup Language (JMSML) project.

Limitations

Please note that it is not possible to convert every symbol identification code. Most symbols from 2525C/APP-6C are available in 2525D/APP-6D. However, many symbol variants from 2525D/APP-6D does not exist in older versions.

Most of the available mappings are for symbols that are ment to be drawn. Some symbol codes exists only for hierarchical purposes and the conversion process may fail for these symbol codes. In these cases, the conversion process will try to pick the closest matching symbol code.

Feel free to open an issue or start a discussion if you find a symbol that is not converted correctly.

Installation

# or pnpm or yarn
npm install @orbat-mapper/convert-symbology

Usage

import { convertLetterSidc2NumberSidc } from "@orbat-mapper/convert-symbology";

const { sidc } = convertLetterSidc2NumberSidc("SFGPUCIC---E---");
console.log(sidc); // "10031000151211000002"

You can also convert from a number based SIDC to a letter based SIDC:

import { convertNumberSidc2LetterSidc } from "@orbat-mapper/convert-symbology";

const { sidc } = convertNumberSidc2LetterSidc("10031000151211000002");
console.log(sidc); // "SFGPUCIC---E---"

The conversion functions return an object with the following properties:

• sidc - a string with the converted number or letter based SIDC. If the conversion failed, the sidc property will be an empty string.
• match - a string indicating the type of match found during the conversion process. Possible values are exact, partial, closest and failed
• success - a boolean flag indicating if the conversion was successful. If true the match property will be exact. If false the match property will be eiter partial, closest or failed.

Examples:

import { convertLetterSidc2NumberSidc } from "@orbat-mapper/convert-symbology";

// convert TACGRP.MOBSU.OBST.AVN (a hierarchical symbol with no graphic representation)
const { sidc, match, success } =
  convertLetterSidc2NumberSidc("G-M-OH---------");
// Protection Points - Vertical Obstructions
console.log(sidc); // "10032500002820000000"
console.log(match); // "exact";
console.log(success); // true;

// convert TACGRP.MOBSU.OBST.AVN.TWR (a hierarchical symbol with no graphic representation)
const { sidc, match, success } =
  convertLetterSidc2NumberSidc("G-M-OHT--------");
// Does not exist in 2525D. Picking closest Protection Points - Vertical Obstructions - Tower High
console.log(sidc); // "10032500002820020000"
console.log(match); // "closest";
console.log(success); // false;

import { convertNumberSidc2LetterSidc } from "@orbat-mapper/convert-symbology";

const { sidc, match, success } = convertNumberSidc2LetterSidc(
  "10031000151211000002",
);
console.log(sidc); // "SFGPUCIC---E---"
console.log(match); // "exact";
console.log(success); // true;

// Convert "Bicyle equipped infantry with dog".
const { sidc, match, success } = convertNumberSidc2LetterSidc(
  "10031000001211002004",
);
// This symbol does not exist in 2525C. Picking partial match Unit - Combat . Infantry
console.log(sidc); // "SFGPUCI--------"
console.log(match); // "partial";
console.log(success); // false;

API

convertLetterSidc2NumberSidc()

Type declarations

function convertLetterSidc2NumberSidc(
  letterSidc: string,
  options?: Letter2NumberOptions,
): Letter2NumberResult;

interface Letter2NumberOptions {}

interface Letter2NumberResult {
  sidc: string;
  success: boolean;
  match: MatchType;
}

type MatchType = "exact" | "partial" | "closest" | "failed";

convertNumberSidc2LetterSidc()

Type declarations

function convertNumberSidc2LetterSidc(
  numberSidc: string,
  options?: Number2LetterOptions,
): Number2LetterResult;

interface Number2LetterOptions {}

interface Number2LetterResult {
  sidc: string;
  success: boolean;
  match: MatchType;
}

type MatchType = "exact" | "partial" | "closest" | "failed";

Credits

The mappings from 2525C to 2525D are based on data from the Joint Military Symbology Markup Language (JMSML) project. Thank you ESRI for making this data available!