Ashtech ProMark 200 Spezifikationen PDF herunterladen (Seite 17)

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4. Choose the World Geodetic System or the country where

your field operations will take place.

5. In the field just underneath, choose the datum used

6. In the field just underneath, choose the projection used.

7. Choose the vertical datum in the last field. The default

possible choices are:

– Ellipsoid: Each altitude or height value is simply

determined with respect to the selected ellipsoid

(second field above).

– EGM84: Each altitude or height value is still initially

determined with respect to the selected ellipsoid but a

correction is applied to that value. The correction is

read from the EGM84 geoid (Earth Geoid Model 1984,

a global geoid model) and is specific to the computed

horizontal position.

Other geoid models may be downloaded to the receiver via

the ProMark Field CD from the Ashtech website. Once

downloaded, they are made available as possible choices

in the Vertical Datum field.

8. Tap OK to complete the job creation procedure. The

software closes the currently open job and opens the new

one instead.

NOTE: If none of the available horizontal systems and vertical

datums are suitable, then you can create a specific

coordinate system by tapping New on the coordinate system

selection screen. To create a new coordinate system, see

Defining a User System on page 12.

Subsequent Uses

of ProMark Field

The next time you launch ProMark Field, the program will

open the job you last opened.

If this job is no longer present in the receiver, then a message

will warn you that the program has been unable to open any

job. You will then have to create a new job or open an existing

one.

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Ashtech ProMark 200 Spezifikationen Seite 17