The st_union function used to combine multiple geometries into a single one with dissolving internal borders. Combining several objects in spatial analysis is an essential process that enables analysts to work with data at an appropriate scale by creating meaningful spatial units into larger ones to create more manageable geographic entities,simplifies complex geometries, and supports a wide range of applications across various domains, including urban planning, environmental management, infrastructure development, and more.
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The paragraph you've provided is clear and conveys the intended information effectively. However, there are a couple of minor improvements you can make for clarity and readability:

Consider breaking the paragraph into two or more sentences for improved readability.

Use a semicolon or period to separate the explanation of the st_union function from the broader discussion of combining several objects in spatial analysis.

Here's a revised version of your text:

"The st_union function is used to combine multiple geometries into a single one while dissolving internal borders. Combining several objects in spatial analysis is an essential process that enables analysts to work with data at an appropriate scale. It involves creating meaningful spatial units by merging smaller ones into larger, more manageable geographic entities. This simplifies complex geometries and supports a wide range of applications across various domains, including urban planning, environmental management, and infrastructure development."

These changes make the text more reader-friendly and provide a clearer separation between the specific function and the broader concept of combining spatial objects.
