imd_distrcitwise_warnings

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IMD Warnings

Get IMD Warning for a location ( actually of the district the location belongs to). Go to the blog post below for all the details.

Blog: https://thejeshgn.com/2024/09/11/simple-imd-alerts/

Credit : https://mausam.imd.gov.in/responsive/subDivisionWiseWarningGIS.php

URL Format

where

lat = latitude
lon = longitude
format = html or json

defaults

If no lat or lon given, it will take bangalore's.
defaults : If no format is given then it is html

Examples:

Bangalore, KA https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=12.9796&lon=77.5906
Thrissur, KL https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=10.527611&lon=76.214389
Lalitpur, UP https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=24.6936599&lon=78.412621
Vishisha, MP https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=23.5210259&lon=77.809569

Code

HTTP

// bangalore https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=12.9796&lon=77.5906

// lalitpur up https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=24.6936599&lon=78.412621

// vishisha MP https://thejeshgn-imd_distrcitwise_warnings.web.val.run/?lat=23.5210259&lon=77.809569

export default async function(req: Request): Promise<Response> {

const url = new URL(req.url);

const lat = parseFloat(url.searchParams.get("lat") || "12.9796");

const lon = parseFloat(url.searchParams.get("lon") || "77.5906");

const format = url.searchParams.get("format") || "html";

// 1 degree of latitude is roughly 111 kilometers

const latOffset = 0.0045; // ~500 meters

// Adjust the longitude offset by the latitude's cosine to account for the Earth's curvature

const lonOffset = latOffset / Math.cos(lat * (Math.PI / 180));

const minLat = lat - latOffset;

const minLon = lon - lonOffset;

const maxLat = lat + latOffset;

const maxLon = lon + lonOffset;

const bbox = minLon + "," + minLat + "," + maxLon + "," + maxLat;

// crude hack but works for now

const now = new Date();

const utcOffset = 5.5 * 60; // IST is UTC+5:30

const istDate = new Date(now.getTime() + utcOffset * 60 * 1000);

// const today = istDate.toISOString();

const today = istDate.toISOString().replace("Z", "+05:30");

const osmand_web = "http://osmand.net/go.html?z=16&lat=" + lat + "&lon=" + lon;

const gmaps_poi = "https://www.google.com/maps?&hl=en&t=m&z=12&ll=" + lat + "," + lon + "&q=" + lat + "," + lon;

const osm = "http://www.openstreetmap.org/?&zoom=16&layers=M&mlat=" + lat + "&mlon=" + lon;

const geo_uri = "geo:" + lat + "," + lon;

const dist_nowcast_warnings =

"https://reactjs.imd.gov.in/geoserver/imd/wms?service=WMS&request=GetMap&layers=imd%3ANowcast_StateDistrict_Merged&styles=&format=image%2Fsvg&transparent=true&version=1.1.1&width=256&height=256&srs=EPSG%3A4326&bbox="

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thejeshgn-imd_distrcitwise_warnings.web.val.run

Updated: September 11, 2024