People in parks are more positive, and those around areas like major transport hubs more negative, according to our analysis of 2.2 million tweets in Melbourne.

Around the world we are seeking to improve the wellbeing of people living in cities. One way is by providing public access to green spaces such as parks. But how do we assess the benefits and identify which parks, and which elements of a park, best promote wellbeing?

To date, researchers have examined the wellbeing benefits of parks using intrusive questionnaires, interviews and physiological tests. We now have technology, including smartphones, apps and social media posts, that we can use to observe these benefits in detail, across very large scales.

Our findings add to the evidence that parks are important for creating smarter, healthier and more liveable cities.

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Hundreds of millions of people around the world use Twitter for updating their family, friends and followers about their daily activities, thoughts and feelings.

People sometimes post public tweets that are linked to the location they are sending from. The words in each tweet can be analysed for their emotional content (referred to as sentiment).

Sentiment analysis categorises each word as positive, negative or neutral, to give an overall score for each tweet.

We averaged tweets across the parks that they were posted from, to give an overall positivity/negativity score for each park.

On average, tweets by people in parks express more joy, anticipation and trust, and lower levels of anger and fear, compared to tweets by people in built-up areas. Being near parks also reduced negativity, but did not affect positivity.

Each tweet is tagged with the time it's posted. Tweet sentiment scores can also be averaged across specific periods, such as hour, day or month.

Beyond the general positive effects of parks compared to built-up areas, we found some general patterns that show people tend to be influenced by the time they are tweeting.

Across the day, from lunch to the end of the work day, people tended to express less and less positivity, before bouncing back in the evening. This change seems to mirror general schooling and working life — that is, how people experience and recover from their work.

Similarly, there is a general pattern of people being more positive on weekends than weekdays. Though this pattern is similar for both parks and built-up areas, parks seem more positive than built-up areas regardless of the day of week.

People might be happier in parks for several reasons. Parks can help them to recover from the stress and mental strain of living in cities, and provide a place to exercise, meet other people, or host special events such as music festivals.

We know parks are great places, but we are still working out exactly why they're great. Knowing more about this will help us make even better parks. Making the best use of public open space and green space is really important as more and more people live in cities around the world.

- The Conversation