# Measure Distances and Areas
The tools available in the **Measurements** panel allow you to measure distances and areas (area and perimeter) on the map.
The **Measurements** panel contains all measurement tools available in the application.
To open the panel, click the **Measurements** button . The icon changes color .
## Using the Measurements Panel
1. Select a measurement tool by clicking its icon. See the [Measurement Tools](#measurement-tools) section for details.
2. Select the Snap option if needed. See the [Snap Tool](#snap-tool) section for details.
3. Choose the layer to which measurements will snap.
4. Perform measurements. You can use multiple tools; measurements accumulate on the map, and the measured distances and/or areas are displayed in the corresponding tool card. The total number of measurements appears in the panel.
Additional controls allow you to:
* View the number of measurements performed
* Select measurements to edit or delete them
* Delete all measurements
* Access measurement help
## Measurement Tools
### Distance
This tool allows you to measure distances. The unit of measurement is defined in the [User Settings](https://docs.jmapcloud.io/en/jmap-ng/jmap-ng-user-guide/introduction/user-profile-and-settings).
1. Click the **Distance** tool to activate it. Instructions appear in the help area at the bottom of the map.
2. Click once the map to start measuring.
3. Click the map to define the vertices of the line.
4. Double-click or press the **Spacebar** to complete the measurement. The length of each segment and the total line length are displayed on the map. The total distance also appears in the **Distance** card.
5. Repeat as needed. The lines remain displayed on the map, and the cumulative total distance appears in the **Distance** card.
6. Click the Delete button in the **Distance** card to remove the lines.
### Area
This tool allows you to measure areas by drawing polygons. The unit of measurement is defined in the [User Settings](https://docs.jmapcloud.io/en/jmap-ng/jmap-ng-user-guide/introduction/user-profile-and-settings).
1. Click the **Area** tool to activate it.
2. Click once the map to start measuring.
3. Click to define the vertices of the polygon.
4. Double-click or press the **Spacebar** to complete the measurement. The length of each segment, the perimeter, and the area are displayed on the map. The area also appears in the **Area** card.
5. Repeat as needed. The polygons remain displayed on the map, and the cumulative total area appears in the **Area** card.
6. Click the Delete button in the **Area** card to remove the measurements.
### Circular Area
This tool allows you to measure circular areas by drawing circles on the map. The unit of measurement is defined in the [User Settings](https://docs.jmapcloud.io/en/jmap-ng/jmap-ng-user-guide/introduction/user-profile-and-settings).
1. Click the **Circular Area** tool to activate it.
2. Click once the map to define the center of the circle.
3. Drag to set the radius.
4. Click the map or press the **Spacebar** to complete the measurement. The radius, circumference, and area are displayed on the map. The area also appears in the **Circular Area** card.
5. Repeat as needed. The circles remain displayed on the map, and the cumulative total area appears in the **Circular Area** card.
6. Click the Delete button in the **Circular Area** card to remove the circles.
## Snap Tool
The **Snap** function allows the pointer to snap to features (points, vertices, or line segments) of the selected layer, resulting in more precise measurements.
To use the Snap tool:
1. Enable the **Snap** option.
2. Select the layer to which measurement vertices should snap.
When the pointer approaches a point, vertex, or line segment of the selected layer, it automatically snaps to that feature. Click to define the vertex of your measurement.
## Modify Measurements
You can modify the shape or location of measurements, or delete them.
You can modify one measurement shape at a time. You can move or delete multiple measurements at once.
### Modify the Shape of a Measurement
1. Click **Select** to enable selection mode.
2. Double-click the measurement to modify. Its vertices appear.
3. Click a vertex to select it (it becomes highlighted).
4. Drag and drop the vertex to change the shape.
5. Click the map to complete the modification.
### Move Measurements
1. Click **Select** to enable selection mode.
2. Click a measurement to select it. Its vertices appear.
3. Hold the SHIFT key and click additional measurements to add them to the selection.
4. Drag and drop the selected measurements to the desired location.
5. Click the map to deselect the measurements.
### Delete Measurements
1. Click **Select** to enable selection mode.
2. Click a measurement to select it.
3. Hold the SHIFT key and click additional measurements to add them to the selection.
4. Click **Delete**. The button displays the number of selected measurements in parentheses. The selected measurements are removed.
. The icon changes color 
.
in the **Distance** card to remove the lines.
### Area
This tool allows you to measure areas by drawing polygons. The unit of measurement is defined in the [User Settings](https://docs.jmapcloud.io/en/jmap-ng/jmap-ng-user-guide/introduction/user-profile-and-settings).
1. Click the **Area** tool to activate it.
2. Click once the map to start measuring.
3. Click to define the vertices of the polygon.
4. Double-click or press the **Spacebar** to complete the measurement. The length of each segment, the perimeter, and the area are displayed on the map. The area also appears in the **Area** card.
5. Repeat as needed. The polygons remain displayed on the map, and the cumulative total area appears in the **Area** card.
