Capture

The Capture tab is used to specify data capture rules for your GPS receiver.

Enable Averaging

When checked, averaging is activated for the GPS capture of Points and Vertices. When averaging is activated the Geography tab of the Feature Properties dialog can not be hidden, as the Geography tab displays progress of averaging. For more information on hiding tabs in the Feature Properties dialog, refer to the Customizing ArcPad help.

The default is unchecked.

Points

Enter the number of continuous GPS fixes you want to average when capturing a point feature with the GPS. Averaging multiple GPS fixes tends to improve the accuracy of the captured point. It is recommended that at least 20 and up to 180 GPS fixes be used when averaging points.

The default is 10.

Vertices

Enter the number of continuous GPS fixes you want to average when capturing a vertex of a polyline or polygon feature with the GPS. Averaging multiple GPS fixes tends to improve the accuracy of the captured vertex. It is recommended that at least 20 and up to 180 GPS fixes be used when averaging vertices.

The default is 5.

Streaming Position Interval

Enter the capture position interval you want to use when capturing continuous vertices of a polyline or polygon feature with the GPS. For example, an interval of 3 results in every third GPS position being captured. So if your GPS receiver is configured to output positions every 5 seconds, an interval of 3 would result in a vertex being captured every 15 seconds.

The default is 1.

Streaming Distance Interval

Enter the capture distance interval you want to use when capturing continuous vertices of a polyline or polygon feature with the GPS. For example, an interval of 3 m means that a vertex will only be captured if the distance from the current GPS position to the previously captured vertex is 3 m or more.

It is recommended that you specify the distance interval when using a GPS and the Offset Polyline/Polygon tool to capture lines or polygons. Specifying a distance interval slightly greater than the accuracy of the GPS will help to eliminate spikes when moving at low speeds or when standing still. The less accurate a GPS receiver, the more the GPS position will “move” at low speeds or when standing still. For example, consumer GPS receivers have an accuracy of 5 to 10 m. Specifying a streaming distance interval of 10 m, or even 15 m, will avoid spikes in the line or polygon when moving at low speeds.

The default is 10 m. Default units are based on the current map projection’s units. However, if the current map projection units are in degrees, the distance interval units are the display units specified on the Display tab of the ArcPad Options dialog box.