# Vertical derivative of Bouguer anomalies

**URL:** <https://forum.generic-mapping-tools.org/t/vertical-derivative-of-bouguer-anomalies/5636>\
**Category:** Q&A\
**Created:** [December 10, 2024, 4:52pm UTC](https://forum.generic-mapping-tools.org/t/vertical-derivative-of-bouguer-anomalies/5636 "2024-12-10T16:52:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TFJospin](https://avatars.discourse-cdn.com/v4/letter/t/eb9ed0/32.png) [@TFJospin](https://forum.generic-mapping-tools.org/u/TFJospin)\
**Post date:** [December 10, 2024, 4:52pm UTC](https://forum.generic-mapping-tools.org/t/vertical-derivative-of-bouguer-anomalies/5636/1 "2024-12-10T16:52:29Z")

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I would like to compute the vertical derivative of Bouguer anomalies using data in both geographical coordinates and projected coordinates (UTM). How should I proceed?

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**Author:** ![Joaquim](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/joaquim/32/16_2.png) [@Joaquim](https://forum.generic-mapping-tools.org/u/Joaquim)\
**Post date:** [December 11, 2024, 1:40am UTC](https://forum.generic-mapping-tools.org/t/vertical-derivative-of-bouguer-anomalies/5636/2 "2024-12-11T01:40:27Z")

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`grdfft -D`?