# How to creat a bathymetric map showing the surrounding rivers?

**URL:** <https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632>\
**Category:** Q&A\
**Created:** [January 23, 2024, 2:39am UTC](https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632 "2024-01-23T02:39:10Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mdhrsumon14](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@mdhrsumon14](https://forum.generic-mapping-tools.org/u/mdhrsumon14)\
**Post date:** [January 23, 2024, 2:39am UTC](https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632/1 "2024-01-23T02:39:10Z")

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Hi! I am a beginner in GMT. I want to create a high-resolution background bathymetric map showing the surrounding rivers of the Indian Ocean (70°E to100°E and -5°N to 30°N) showing the elevation scale. Can anybody instruct me or help me by constructing the code to generate the map? Thanks in advance.

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**Author:** ![PlanetGus](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/planetgus/32/303_2.png) [@PlanetGus](https://forum.generic-mapping-tools.org/u/PlanetGus)\
**Post date:** [January 23, 2024, 6:07am UTC](https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632/2 "2024-01-23T06:07:46Z")

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See grdimage first (with remote dataset like @earth or others), then coast.  
Both are well documented 🙂

The general framework would be:  
`ˋ`  
gmt begin mymap png  
gmt grdimage -R(region) -J(projection) […] #first layer  
gmt coast […] # second layer, which remembers the region and projection from first one  
gmt end show  
ˋ`ˋ

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**Author:** ![thwbecker](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/thwbecker/32/1215_2.png) [@thwbecker](https://forum.generic-mapping-tools.org/u/thwbecker)\
**Post date:** [January 24, 2024, 4:07am UTC](https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632/3 "2024-01-24T04:07:48Z")

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Also, see for example

> **[(2) Image presentations — GMT 6.6.0 documentation](https://docs.generic-mapping-tools.org/dev/gallery/ex02.html)**

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**Author:** ![mdhrsumon14](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@mdhrsumon14](https://forum.generic-mapping-tools.org/u/mdhrsumon14)\
**Post date:** [January 28, 2024, 6:07am UTC](https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632/4 "2024-01-28T06:07:19Z")

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Thank you for your reply.  
However, I expect a more constructive and clear solution with an example to build up the map. Could you please help me by telling me the details with a complete example?  
I appreciate any help you can provide.

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**Author:** ![pwessel](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/pwessel/32/30_2.png) [@pwessel](https://forum.generic-mapping-tools.org/u/pwessel)\
**Post date:** [January 28, 2024, 9:08am UTC](https://forum.generic-mapping-tools.org/t/how-to-creat-a-bathymetric-map-showing-the-surrounding-rivers/4632/5 "2024-01-28T09:08:59Z")

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Don’t think you are exempt from reading the documentation?