# Volume Help - Sand in a bay, on a slope **URL:** \ **Category:** PIX4Dmapper\ **Created:** [May 23, 2021, 8:52pm UTC](https://community.pix4d.com/t/volume-help-sand-in-a-bay-on-a-slope/18228 "2021-05-23T20:52:10Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![Blaz](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/blaz/32/4344_2.png) [@Blaz](https://community.pix4d.com/u/Blaz)\ **Post date:** [May 25, 2021, 11:48am UTC](https://community.pix4d.com/t/volume-help-sand-in-a-bay-on-a-slope/18228/5 "2021-05-25T11:48:21Z")
Hi @operations1, In order to adjust the height of an individual vertex, you will need to switch to the rayCloud and: - Edit the height of the vertices in rayCloud. When the volume is drawn vertices are created as MTPs. **These MTPs can be modified to 3D GCPs (Ground Control Points) in the rayCloud view. This enables you to give specific coordinates to each point (z), e.g. based on a previous survey of the area or as a height of the surrounding area.** More here: > [@Volume vertices](https://community.pix4d.com/t/volume-vertices/6653/2): > > Hi Kevin, Thank you for the detailed description. I believe that I understood it and that we are on the same page. Well, at least I hope so (: The scenario you are facing is quite difficult and there is no straightforward solution on how to calculate the volume of this specific stockpile.  It might be possible to get an estimation of the volume if you divide it into two part, the volume until the base of the batter (1), and the volume from the base of the batter to the top of it (2). The volu… --- _[View the full topic](https://community.pix4d.com/t/volume-help-sand-in-a-bay-on-a-slope/18228)._