# Determining basins and seamounts using GMT spatial:

**URL:** <https://forum.generic-mapping-tools.org/t/determining-basins-and-seamounts-using-gmt-spatial/797>\
**Category:** Q&A\
**Tags:** gmt\
**Created:** [August 24, 2020, 12:33am UTC](https://forum.generic-mapping-tools.org/t/determining-basins-and-seamounts-using-gmt-spatial/797 "2020-08-24T00:33:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![hannahscholz](https://avatars.discourse-cdn.com/v4/letter/h/5f8ce5/32.png) [@hannahscholz](https://forum.generic-mapping-tools.org/u/hannahscholz)\
**Post date:** [August 24, 2020, 12:33am UTC](https://forum.generic-mapping-tools.org/t/determining-basins-and-seamounts-using-gmt-spatial/797/1 "2020-08-24T00:33:05Z")

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Hello,

I am trying to locate basins in the Carpentaria Gulf off the coast of Australia.  
I have been previously using gmt spatial commands like: _gmt spatial -Qe -fg_, to locate closed polygons, ‘seamounts’ in a sense.  
Would anyone know of a way to locate the centroid location of a basin, for example, an area in which the depth starts as 60m and then decreases to 80m over 5 miles then back up to 60m?

I have looked through the documentation on GMT but cannot find much about it.  
Any ideas or thoughts would be greatly appreciated.

Thank you 🙂  
Hannah