Spectra-precision FAST Survey Bedienungsanleitung PDF herunterladen (Seite 53)

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Helmert Localization

1. With your job open in FAST Survey, tap on the Equip tab

and then on the Localization button.

2. Tap on the GPS tab and select “Helmert” from the Multi

Point Method field.

3. Tap on the By Helmert tab and then enter the seven

parameters defining the new datum of the local grid.

4. Tap . The localization process is now complete and

active. This means every new point you will now survey will

be expressed on the local grid.

Computing Helmert Parameters from a Multi-Point

Localization File

• Follow the instructions to perform a multi-point

localization.

• After all the points have been defined, tap on the By

Helmert tab.

• Tap on the Calc from Pts button. FAST Survey computes the

seven Helmert parameters and displays the result in the

corresponding fields.

• To save the seven parameters as a TXT file, tap on the

Output to Text File button and name the file.

Using a Geoid File

in the Localization

Process

A l

ibrary of geoids is available from the Spectra Precision

website. Once you have downloaded the desired geoid, you

need to use the Extract tool, also available and

downloadable from the same web page, to convert the geoid

into a GSF file, the only format FAST Survey can work from.

The converted file can then be downloaded to the data

collector through the USB connection.

The details of the procedure are given below. Note that the

Extract Tool can also be used to reduce the geographical

extent of the geoid before you download it to the data

collector.

Downloading a Geoid to your Computer

• Use your office computer to go to the web page: http://

resources.ashtech.com/GEOIDS,

• Select the desired geoid by clicking on the corresponding

link. You are then prompted to save the

Install_<Geoid_Name>.exe file on your computer.

• Click Save File and wait until the download is complete.

•Run the Install_<Geoid_Name>.exe file on your computer.

Follow the instructions on the screen to complete the

installation.

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