Find the distance using Geo Location fields.

Story: Contact has to visit a nearest branch for the respective work.

Idea: List the nearest business branches to a contact. Information can to be stored in Contact object text area field.

Snippet:

	list<Contact> conLst = new List<Contact>();
	list<BranchAddresses__c> otherAddressLst = [SELECT City__c, Geolocation__c FROM BranchAddresses__c];
	Double miles_constant_value = 100.00;
	for(Contact con : [SELECT Id, Geolocation__c, Branch_Distance__c FROM Contact]){
	set<string> brCitySet = new set<string>();
	Location conLocation = con.Geolocation__c;
	for(BranchAddresses__c br: otherAddressLst){
	Location brLocation = br.Geolocation__c;
	Double distance = conLocation.getDistance(brLocation, 'mi');
	if(conLocation.getDistance(brLocation, 'mi') < miles_constant_value){
	brCitySet.add(br.City__c + '--> ' + distance);
	}
	}
	con.Branch_Distance__c = null;
	if(!brCitySet.isEmpty()){
	for(string brStr: brCitySet)con.Branch_Distance__c += brStr + '\n';
	con.Branch_Distance__c = con.Branch_Distance__c.removeStart('null');
	conLst.add(con);
	}else if(brCitySet.isEmpty()){
	con.Branch_Distance__c = null;
	conLst.add(con);
	}
	}
	Database.SaveResult[] results = Database.Update(conLst, false);

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PS: I have created this idea keeping nearest ATM find concept in my thoughts. This is not a requirement as such.