Just about anything that can be seen from the air can be photographed; they could be doing nothing more than flying an aircraft overhead and taking pictures.
As far as whether you're being harassed, there aren't enough facts to say one way or the other, but as far as the photographs being illegal, based on what you've provided by way of information, they don't sound like they're illegal.
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Is the City telling you that you need to clean up your yard? Do you have a lot of "stuff" in your backyard or house? Are they claiming you have a hoarding type of situation? Many cities have local ordinances that will allow them to cite, fine, and even place a property in receivership if they believe the conditions of the property are such that put the owner, neighbors, or community in harm or at risk. In some situations, cities can get court orders requiring people to clean up their properties and if they do not, then the owners can face criminal charges. This is even more so if there are children living at the home. The easiest way to get them off your back is to do what they are asking. Many times you do not have to clean up everything, but at least make a dent in the clutter.
As for the photographs, if you are that worried about people looking into your backyard, you can always place tarps over your yard, but as my colleague has said, taking pictures of your backyard from an airplane is not illegal or an invasion of your privacy.
Ms. Peddy Berg is licensed to practice law in Arizona and California (currently inactive); and her office is located in Scottsdale, Arizona. You can contact Ms. Peddy Berg by calling her office at (480) 382-3109; or contacting her through her website www.thepeddyberglawfirm.com. In accordance with AVVO terms and conditions, this answer does not constitute legal advice, and should not be relied upon. Answering this question does not create an attorney-client relationship with Ms. Peddy Berg or The Peddy Berg Law Firm, PLLC. Each state has different laws, every situation is specific to its given facts, and it is impossible to evaluate and provide advice on a legal issue without first doing a full analysis of the facts and documentation via an individual consultation.
The prior answers are correct. Beyond that, did abutting property owners give them permission to cross their land to reach your fencing? Beyond that, what statutes, ordinances or regulations is the city claiming apply to your possessions? Read them and if you can, be prepared to argue that your storage practices do not violate them. But as I presume you are elderly, is this really worth it. Sell the stuff if you can and then enjoy your life.