Spectra-precision FAST Survey User Manual download pdf (Page 65)

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Known Base Position

Unknown Base Position

Using a

background Map

in FAST Survey

Click on the link below to read a tutorial on how to use an

image file as a background map:

http://update.carlsonsw.com/

kbase_main.php?action=display_topic&topic_id=477

Choice Case of Use

Previously Sur-

veyed Point

Choose this option if the base is installed on a point you sur-

veyed earlier and the latitude, longitude and ellipsoidal height

of this point are saved in the open job. In this case, select this

point from the job’s point list or select it graphically on the map

of the working area.

Use Local Coor-

dinates

Choose this option if the coordinates of the point where the

base is installed are known and expressed in the projection

system used in the job.

You can enter the local coordinates either manually or by

choosing a point from the job’s points list. In this case, and

unlike the previous choice, the point from the points list is

defined with local instead of geographical (lat, lon, height)

coordinates.

Read from File

Choose this option if the geographical coordinates of the base

were saved earlier to a REF file. Then select this file to load

the position held in this file as the base position.

Choice Case of Use

Read from GPS

Choose this option if you want the base receiver to determine

its own WGS84 coordinates.

The coordinates will be determined to within 1-3 meters as the

autonomous GPS or S-DGPS mode is used in this case. To

improve the accuracy of the computation, FAST Survey

prompts you to take several readings (typically 10 readings or

x readings over a certain period of time) so that all these read-

ings can be averaged to provide a more accurate position

solution for the base.

Enter Lat/Lon

Choose this option if you know and want to enter manually the

latitude, longitude and ellipsoidal height of the base location,

rather than ask the receiver to compute them by itself.

The coordinates should be entered in the “dd.mmssss” format

for latitude and longitude.

Enter Grid Sys-

tem Coordinates

Choose this option to freely enter base coordinates expressed

in the projection system used in the job. You may enter them

manually or derive them from a point in the points list or a

point you select on the map of the working area.

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Spectra-precision FAST Survey User Manual Page 65

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