---
title: Automatic volumes
description: Learn how to use the Automatic Volumes tool in the SkySnap geoportal, from setup and section generation to Analytics results, recalculating individual sections, and creating volume reports.
---

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# Automatic volumes

## The automatic volume tool generates volume sections in bulk along a road or railway axis based on chainage. Instead of defining each solid manually, you specify the axis, range, surfaces, and interval, and the portal divides the section into segments and calculates the cut, fill, and net volume for each of them.

---

 

**Table of contents:**

[Requirements](https://help.skysnap.com/en/automatic-volume-calculation#requirements)

[Process automation](https://help.skysnap.com/en/automatic-volume-calculation#process_automation)

[Results in the Analytics tile](https://help.skysnap.com/en/automatic-volume-calculation#results)

[Recalculating individual sections](https://help.skysnap.com/en/automatic-volume-calculation#recalculating_individual_sections)

 

---

### Requirements

To use this tool, the project must contain: 

- a vector **line layer** representing the axis (e.g. a road axis or railway tracks),
- **elevation raster** required for volume calculations.

**IMPORTANT:** The axis must be uploaded as a dedicated **“mileage”** data type and must include a **start** attribute that defines the chainage at which the section begins. Based on this attribute, the portal assigns the correct chainage to each section. Without the **start** attribute, the data will not be processed correctly. 

### Process automation

The “Automations” tile is located in the left-hand panel. There, select **Automatic volumes** to generate automatic volume sections based on the axis and mileage. 

![](https://help.skysnap.com/hs-fs/hubfs/01_panel_automatyzacje-png.png?width=245&height=373&name=01_panel_automatyzacje-png.png)

In the **“Automatic volumes”** window, complete the following parameters: 

- **Choose center line** - the line layer along which the sections will be generated,
- **Choose range** - a vector layer defining the range of calculation area,
- **Choose surface** - the base surface,
- **Choose reference surface** - the comparison surface. The volume is calculated between these two surfaces,
- **Start station / End station** - the section mileage (two fields: km + m),
- **Cross sections interval \[m\]** - the frequency of sections generation.

 **ATTENTION:** The cross section interval is now expressed in **\[m\]** instead of \[km\]. 

Click **“START PROCESSING.”** 

**![automatic\_volumes\_form\_km\_to\_m](https://help.skysnap.com/hs-fs/hubfs/automatic_volumes_form_km_to_m.png?width=377&height=541&name=automatic_volumes_form_km_to_m.png)**

When processing is complete, the message **“Automatic volumes generated successfully”** will appear. 

![](https://help.skysnap.com/hs-fs/hubfs/03_komunikat_sukces-png.png?width=356&height=185&name=03_komunikat_sukces-png.png)

 

### Results in the Analytics tile

The generated sections will appear in the **Analytics** tile. Once processing is complete, the volumes boundaries are automatically displayed on the map along the axis, labeled with volume value. 

![](https://help.skysnap.com/hs-fs/hubfs/image-png-Jul-21-2026-08-17-12-5013-AM.png?width=670&height=360&name=image-png-Jul-21-2026-08-17-12-5013-AM.png)

Click any section to open the properties panel. The **Surfaces volume** section displays: 

- **Area 2D** - the 2D area of the section,
- **Cut** - excavation volume,
- **Fill** - embankment volume,
- **Net volume** - the net balance of cut and fill.

 

### Recalculating individual sections

Each section can be recalculated individually by changing the surface and reference plane. In the section panel, expand **Surfaces** and set: 

1. **Surface** - the surface against which the volume is calculated,
2. **Base plane** - the reference plane:  
     1. Interpolation,
     2. Comparison map,
     3. Custom height - local max and min height or specified height.

In the **Settings** section, set **Choose label** - the value displayed as the section label on the map:

- Name,
- Area 2D,
- Cut,
- Fill,
- Net volume,
- Cut/Fill/Net.

Click **“SAVE CHANGES & RECALCULATE.”** The values in the table and the label on the map will be updated. 

![](https://help.skysnap.com/hs-fs/hubfs/08_panel_po_przeliczeniu-png.png?width=431&height=580&name=08_panel_po_przeliczeniu-png.png)

A color palette is also available in the section panel to change the section color on the map. 

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