Capture geometry

There are multiple ways to capture points, lines, and areas in Survey123. Capture points by tapping the map, using your current location, or by searching for a location by name or coordinates. Draw lines and areas as a sketch, or vertex by vertex.

Capture points

You can capture points by panning the map so that it is centered at the location you choose, by tapping the capture at location button, or by searching for a location or map coordinate.

While panning the map, or when you tap the capture at location button, the coordinates of the current location are shown at the bottom of the map window. Tap these coordinates to add them to the search bar so that you can refine the values. To return to searching by location, tap the cancel button in the search bar.

When typing a map coordinate directly in the search box, enter comma-separated decimal coordinates. For example, the following coordinates will center the map at the Eiffel Tower in Paris: 48.858328, 2.294514.

Capture lines and areas

Lines and areas have two capture methods, sketch and vertex. The survey author defines which method is used by a survey. The user responding to the survey in either the Survey123 field app or web app cannot choose between the two.

Sketch

The sketch method captures the geometry in a single motion, with the capture completing once the user has stopped drawing this single line. To begin capturing sketch geometry, tap the Sketch button Sketch Geotrace Sketch Geoshape and begin drawing the shape on the map. When you finish sketching the geometry, stop interacting with the map. The geometry is then complete, with the geoshape connecting the beginning and end of the shape if necessary. The length of a geotrace, or the area and perimeter of a geoshape, is displayed below the map.

The sketch method also provides a smart shape option, which attempts to simplify the sketched geometry into an ellipse, rectangle, or triangle. To use smart sketching, tap the Smart Shapes button Smart Shapes and begin drawing the shape on the map. If the sketch is recognizable as an ellipse, rectangle, or triangle, the app automatically converts it. If the sketch doesn't resemble one of these shapes, no geometry is drawn.

When you finish drawing the geometry, either tap the Confirm button to accept this geometry and go back to your survey, or tap one of the drawing buttons to erase it and draw another geometry.

Response to a geotrace question

Vertex

The vertex method allows more precise geometric capture of a line or shape by placing vertices that connect together. To begin capturing vertex geometry, tap the Vertex button Vertex Geotrace Vertex Geoshape and tap the map to place the first vertex. You can place more vertices by tapping the map again or tapping the Capture Vertex at Location button Vertex from Location to place a vertex at the location of your device.

To move the map instead of placing vertices, tap the Pan and Zoom button Pan and Zoom to change map interactions to navigation mode. You can then capture a vertex at the map's central point with the Capture Vertex at Crosshair button Vertex from Crosshair.

If you place a vertex at the wrong position, tap the Undo button Undo in the lower right to remove the last vertex placed, drag the point to move it to a new location, or drag the point to the Delete button that appears at the top of the map window. When you finish, you can tap the Confirm button to accept this geometry and go back to your survey.

If vertex streaming is enabled by the survey author, the Follow button Follow will display. Tap this button to begin capture. Line or area vertices are captured at a nominated minimum distance interval as you move around. The default minimum distance interval is 10 meters, but this can be changed by the survey author. For more information, see Capture methods.