diff --git a/src/common/elastic/utils.ts b/src/common/elastic/utils.ts
index 5a7d4ce1..eb82cd3e 100644
--- a/src/common/elastic/utils.ts
+++ b/src/common/elastic/utils.ts
@@ -1,17 +1,13 @@
+import { WGS84Coordinate } from '../interfaces';
+
 /* eslint-disable @typescript-eslint/naming-convention */
 export const boundingBox = (
   bbox: number[]
 ): {
   geo_bounding_box: {
     geometry: {
-      top_left: {
-        lon: number;
-        lat: number;
-      };
-      bottom_right: {
-        lon: number;
-        lat: number;
-      };
+      top_left: WGS84Coordinate;
+      bottom_right: WGS84Coordinate;
     };
   };
 } => ({
@@ -29,17 +25,12 @@ export const boundingBox = (
   },
 });
 
-export const geoDistance = (params: {
-  radius: number;
-  lon: number;
-  lat: number;
-}): {
+export const geoDistance = (
+  params: WGS84Coordinate & { radius: number }
+): {
   geo_distance: {
     distance: string;
-    geometry: {
-      lon: number;
-      lat: number;
-    };
+    geometry: WGS84Coordinate;
   };
 } => ({
   geo_distance: {
diff --git a/src/common/interfaces.ts b/src/common/interfaces.ts
index 7d98367f..ca49a24a 100644
--- a/src/common/interfaces.ts
+++ b/src/common/interfaces.ts
@@ -36,3 +36,8 @@ export interface Geometry {
 export interface FeatureCollection<T extends Feature> extends GeoJSONFeatureCollection {
   features: T[];
 }
+
+export interface WGS84Coordinate {
+  lat: number;
+  lon: number;
+}
diff --git a/src/common/utils.ts b/src/common/utils.ts
index e618aa7c..2354277a 100644
--- a/src/common/utils.ts
+++ b/src/common/utils.ts
@@ -6,7 +6,7 @@ import { Tile } from '../tile/models/tile';
 import { Route } from '../route/models/route';
 import { FIELDS } from './constants';
 import { utmProjection, wgs84Projection } from './projections';
-import { FeatureCollection } from './interfaces';
+import { FeatureCollection, WGS84Coordinate } from './interfaces';
 
 export const formatResponse = <T extends Item | Tile | Route>(elasticResponse: estypes.SearchResponse<T>): FeatureCollection<T> => ({
   type: 'FeatureCollection',
@@ -78,16 +78,9 @@ export const convertWgs84ToUTM = (
 };
 /* eslint-enable @typescript-eslint/naming-convention */
 
-export const convertUTMToWgs84 = (
-  x: number,
-  y: number,
-  zone: number
-): {
-  lat: number;
-  lng: number;
-} => {
+export const convertUTMToWgs84 = (x: number, y: number, zone: number): WGS84Coordinate => {
   const [longitude, latitude] = proj4(utmProjection(zone), wgs84Projection, [x, y]);
-  return { lat: latitude, lng: longitude };
+  return { lat: latitude, lon: longitude };
 };
 
 export const validateTile = (tile: { tileName: string; subTileNumber: number[] }): boolean => {
diff --git a/src/item/controllers/itemController.ts b/src/item/controllers/itemController.ts
index a06d2457..1a8f5776 100644
--- a/src/item/controllers/itemController.ts
+++ b/src/item/controllers/itemController.ts
@@ -7,17 +7,9 @@ import { injectable, inject } from 'tsyringe';
 import { SERVICES } from '../../common/constants';
 import { ItemManager } from '../models/itemManager';
 import { Item } from '../models/item';
-import { GeoContext } from '../../common/interfaces';
+import { FeatureCollection, GeoContext } from '../../common/interfaces';
 
-type GetResourceHandler = RequestHandler<
-  undefined,
-  {
-    type: string;
-    features: (Item | undefined)[];
-  },
-  undefined,
-  GetItemsQueryParams
->;
+type GetItemsHandler = RequestHandler<undefined, FeatureCollection<Item>, undefined, GetItemsQueryParams>;
 
 export interface GetItemsQueryParams {
   command_name: string;
@@ -40,7 +32,7 @@ export class ItemController {
     this.createdResourceCounter = meter.createCounter('created_resource');
   }
 
-  public getItems: GetResourceHandler = async (req, res, next) => {
+  public getItems: GetItemsHandler = async (req, res, next) => {
     try {
       const { command_name: commandName, tile, sub_tile, geo_context, reduce_fuzzy_match, size } = req.query;
       const response = await this.manager.getItems(
diff --git a/src/latLon/DAL/latLonRepository.ts b/src/latLon/DAL/latLonRepository.ts
index 1e884426..e173010c 100644
--- a/src/latLon/DAL/latLonRepository.ts
+++ b/src/latLon/DAL/latLonRepository.ts
@@ -3,6 +3,7 @@ import { DataSource } from 'typeorm';
 import { FactoryFunction } from 'tsyringe';
 import { LatLon as LatLonDb } from './latLon';
 
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
 const createLatLonRepository = (dataSource: DataSource) => {
   return dataSource.getRepository(LatLonDb).extend({
     async latLonToTile({ x, y, zone }: { x: number; y: number; zone: number }): Promise<LatLonDb | null> {
diff --git a/src/latLon/controllers/latLonController.ts b/src/latLon/controllers/latLonController.ts
index ae1ca70f..00633d6a 100644
--- a/src/latLon/controllers/latLonController.ts
+++ b/src/latLon/controllers/latLonController.ts
@@ -7,7 +7,7 @@ import { injectable, inject } from 'tsyringe';
 import { SERVICES } from '../../common/constants';
 import { LatLonManager } from '../models/latLonManager';
 import { Tile } from '../../tile/models/tile';
-import { FeatureCollection } from '../../common/interfaces';
+import { FeatureCollection, WGS84Coordinate } from '../../common/interfaces';
 
 type GetLatLonToTileHandler = RequestHandler<
   undefined,
@@ -23,29 +23,16 @@ type GetTileToLatLonHandler = RequestHandler<undefined, FeatureCollection<Tile>,
 
 type GetLatLonToMgrsHandler = RequestHandler<undefined, { mgrs: string }, undefined, GetLatLonToMgrsQueryParams>;
 
-type GetMgrsToLatLonHandler = RequestHandler<
-  undefined,
-  {
-    lat: number;
-    lon: number;
-  },
-  undefined,
-  GetMgrsToLatLonQueryParams
->;
+type GetMgrsToLatLonHandler = RequestHandler<undefined, WGS84Coordinate, undefined, GetMgrsToLatLonQueryParams>;
 
-export interface GetLatLonToTileQueryParams {
-  lat: number;
-  lon: number;
-}
+export interface GetLatLonToTileQueryParams extends WGS84Coordinate {}
 
 export interface GetTileToLatLonQueryParams {
   tile: string;
   sub_tile_number: number[];
 }
 
-export interface GetLatLonToMgrsQueryParams {
-  lat: number;
-  lon: number;
+export interface GetLatLonToMgrsQueryParams extends WGS84Coordinate {
   accuracy?: number;
 }
 export interface GetMgrsToLatLonQueryParams {
diff --git a/src/latLon/models/latLonManager.ts b/src/latLon/models/latLonManager.ts
index cbe322e5..df0214bc 100644
--- a/src/latLon/models/latLonManager.ts
+++ b/src/latLon/models/latLonManager.ts
@@ -8,7 +8,7 @@ import { convertWgs84ToUTM, validateTile, validateWGS84Coordinate } from '../../
 import { convertTilesToUTM, getSubTileByBottomLeftUtmCoor, validateResult } from '../utlis';
 import { BadRequestError } from '../../common/errors';
 import { Tile } from '../../tile/models/tile';
-import { FeatureCollection } from '../../common/interfaces';
+import { FeatureCollection, WGS84Coordinate } from '../../common/interfaces';
 
 @injectable()
 export class LatLonManager {
@@ -22,7 +22,7 @@ export class LatLonManager {
     this.dbSchema = this.config.get('db.postgresql.schema');
   }
 
-  public async latLonToTile({ lat, lon }: { lat: number; lon: number }): Promise<{
+  public async latLonToTile({ lat, lon }: WGS84Coordinate): Promise<{
     tileName: string;
     subTileNumber: number[];
   }> {
diff --git a/src/latLon/utlis/index.ts b/src/latLon/utlis/index.ts
index ae6e67de..aedc39ef 100644
--- a/src/latLon/utlis/index.ts
+++ b/src/latLon/utlis/index.ts
@@ -89,7 +89,7 @@ export const getSubTileByBottomLeftUtmCoor = (
     if (typeof coordiante === 'string') {
       throw new Error('coordinate is string');
     }
-    polygon.coordinates[0].push([coordiante.lng, coordiante.lat]);
+    polygon.coordinates[0].push([coordiante.lon, coordiante.lat]);
   }
 
   result.features[0].geometry = polygon;
diff --git a/src/route/DAL/queries.ts b/src/route/DAL/queries.ts
index 628a0ef3..c07f5309 100644
--- a/src/route/DAL/queries.ts
+++ b/src/route/DAL/queries.ts
@@ -1,7 +1,6 @@
 import { estypes } from '@elastic/elasticsearch';
 import { boundingBox, geoDistance } from '../../common/elastic/utils';
-import { Route } from '../models/route';
-import { GeoContext } from '../../common/interfaces';
+import { GeoContext, WGS84Coordinate } from '../../common/interfaces';
 
 export interface RouteQueryParams {
   commandName: string;
@@ -61,17 +60,7 @@ export const queryForControlPointInRoute = (params: RouteQueryParams & Required<
           },
         },
         ...(params.geo?.bbox ? [boundingBox(params.geo.bbox)] : []),
-        ...(params.geo?.radius
-          ? [
-              geoDistance(
-                params.geo as {
-                  radius: number;
-                  lon: number;
-                  lat: number;
-                }
-              ),
-            ]
-          : []),
+        ...(params.geo?.radius ?? 0 ? [geoDistance(params.geo as WGS84Coordinate & { radius: number })] : []),
       ],
       filter: [
         {
diff --git a/src/route/controllers/routeController.ts b/src/route/controllers/routeController.ts
index 2232fde4..ce388fd3 100644
--- a/src/route/controllers/routeController.ts
+++ b/src/route/controllers/routeController.ts
@@ -5,20 +5,11 @@ import { RequestHandler } from 'express';
 import httpStatus from 'http-status-codes';
 import { injectable, inject } from 'tsyringe';
 import { SERVICES } from '../../common/constants';
-
 import { RouteManager } from '../models/routeManager';
 import { Route } from '../models/route';
-import { GeoContext } from '../../common/interfaces';
+import { FeatureCollection, GeoContext } from '../../common/interfaces';
 
-type GetResourceHandler = RequestHandler<
-  undefined,
-  {
-    type: string;
-    features: (Route | undefined)[];
-  },
-  undefined,
-  GetRoutesQueryParams
->;
+type GetRoutesHandler = RequestHandler<undefined, FeatureCollection<Route>, undefined, GetRoutesQueryParams>;
 
 export interface GetRoutesQueryParams {
   command_name: string;
@@ -40,7 +31,7 @@ export class RouteController {
     this.createdResourceCounter = meter.createCounter('created_resource');
   }
 
-  public getRoutes: GetResourceHandler = async (req, res, next) => {
+  public getRoutes: GetRoutesHandler = async (req, res, next) => {
     try {
       const { command_name: commandName, control_point, geo_context, reduce_fuzzy_match, size } = req.query;
       const response = await this.manager.getRoutes(
diff --git a/src/tile/controllers/tileController.ts b/src/tile/controllers/tileController.ts
index 27992fda..3e86c335 100644
--- a/src/tile/controllers/tileController.ts
+++ b/src/tile/controllers/tileController.ts
@@ -5,16 +5,13 @@ import { RequestHandler } from 'express';
 import httpStatus from 'http-status-codes';
 import { injectable, inject } from 'tsyringe';
 import { SERVICES } from '../../common/constants';
-
 import { TileManager } from '../models/tileManager';
 import { Tile } from '../models/tile';
+import { FeatureCollection } from '../../common/interfaces';
 
-type GetResourceHandler = RequestHandler<
+type GetTilesHandler = RequestHandler<
   undefined,
-  | {
-      type: string;
-      features: (Tile | undefined)[];
-    }
+  | FeatureCollection<Tile>
   | {
       type: string;
       message: string;
@@ -42,7 +39,7 @@ export class TileController {
     this.createdResourceCounter = meter.createCounter('created_resource');
   }
 
-  public getTiles: GetResourceHandler = async (req, res, next) => {
+  public getTiles: GetTilesHandler = async (req, res, next) => {
     try {
       const { tile, sub_tile, reduce_fuzzy_match, size } = req.query;
       const response = await this.manager.getTiles(
diff --git a/tests/unit/common/utils.spec.ts b/tests/unit/common/utils.spec.ts
index 62076f0b..df63e54c 100644
--- a/tests/unit/common/utils.spec.ts
+++ b/tests/unit/common/utils.spec.ts
@@ -10,6 +10,7 @@ import {
 } from '../../../src/common/utils';
 import config from '../../../config/test.json';
 import { FIELDS } from '../../../src/common/constants';
+import { WGS84Coordinate } from '../../../src/common/interfaces';
 import {
   itemElasticResponse,
   itemExpectedFormattedResponse,
@@ -40,7 +41,7 @@ describe('utils', () => {
 
   it('should convert UTM to WGS84', () => {
     const result = convertUTMToWgs84(630048, 4330433, 29);
-    expect(result).toMatchObject({ lat: 39.11335578352079, lng: -7.495780486809503 });
+    expect(result).toMatchObject({ lat: 39.11335578352079, lon: -7.495780486809503 });
   });
 
   it('should convert WGS84 to UTM', () => {
@@ -60,7 +61,7 @@ describe('utils', () => {
     expect(validateTile(tile as never)).toBe(expected);
   });
 
-  test.each([
+  test.each<[WGS84Coordinate, boolean]>([
     [{ lon: 50, lat: 50 }, true],
     [{ lon: 190, lat: 50 }, false],
     [{ lon: 50, lat: 190 }, false],