You can save the information from a GPS device to a shapefile or geodatabase feature class. You can write individual points to the log or stream data. When streaming data, you can also filter the data by properties such as time or distance. To write data to a log, you must first either create a new log or open an existing log and append locations to it.
The log has the same spatial reference as the GPS device. Besides the actual coordinate values, you can save related information to the log’s attribute table.
The following are descriptions of the fields you can save to the log:
| Field | Description |
|---|---|
Latitude | The latitude value of the position. |
Longitude | The longitude value of the position. |
Altitude | The altitude of the position. The unit of measure is set in Display Properties. |
Date_time | The date and time of day of the position. |
Date | The date of the position. |
Time | The time of day of the position. If the log file is a shapefile, this field is written as a string type field using the time format specified in Windows Control Panel. |
Speed_KPH | The speed in kilometers per hour of the position. This is calculated using the coordinates and the date_time information of the current and previous positions. |
Heading | The direction in degrees as measured east of north of the current position. This is calculated using the previous position's coordinate. |
HDOP | The horizontal dilution of precision of the position. It reflects the effect of the current geometric satellite distribution. |
VDOP | The vertical dilution of precision of the position. It reflects the effect of the current geometric satellite distribution. |
PDOP | The positional dilution of precision of the position. This is a combination of the HDOP and VDOP and reflects the effect of the current geometric satellite distribution. |
DGPS_ID | The identification of the differential GPS unit. |
DGPS_age | The length of time since the last contact with the DGPS base station. |
Magnet_var | The magnetic variation of the position in degrees. |
Numof_sats | The number of satellites used to calculate the position. |
Avgsat_SNR | The average satellite signal-to-noise ratio. |
Sats_inuse | The number of satellites in use for the position. |
Quality | Quality indicator of the position. |