Ashtech Z-Surveyor Service Manual download pdf (Page 37)

Survey Preparation & Execution 29

Surveying

a new data file. Data will be recorded at an interval of 20 seconds, i.e once

very 20 seconds, a data sample will be written to memory. This is the default

factory setting for recording interval. If desired, the recording interval can be

changed. For static survey method, recording intervals of 5 to 30 seconds are

commonly used. The interval can be changed either through the interface on

the Z-Xtreme receiver or by using the handheld computer running the field

application software. Refer to the appropriate manuals for details on how to

perform this task.

If you want to change the recording interval, it is important to set the same recording interval for all

receivers used in the survey. GPS surveying depends on simultaneous data being collected by all

GPS receivers used. If one receiver is set to a recording interval of 20 seconds and the other is set

to 5 seconds, there will only be common data once every 20 seconds.

7. Record point ID, descriptor, and HI

Point ID and HI are important attributes of the point being surveyed. Each

point in the survey requires a unique point ID. If a specific point is observed

more than once during the survey, the same point ID is assigned to this point

each time. Both the point ID and HI are required for each observation during

data processing.

There are two places where the point attribute information can be recorded

(ID, descriptor, HI). One place is on an observation log sheet. For each

observation, an observation log sheet should be filled out, containing the

attribute information of the point being observed along with additional

information about the observation. The log sheet accompanies the raw data

for use during data post-processing. The post-processing software that is

included with the Z-Xtreme surveying system includes the ability to print

observation log sheets for use during data collection.

In addition to recording the point attribute information in the observation log,

attribute information can also be entered into the GPS receiver for storage.

The attribute information will be stored along with the raw GPS data. This

attribute information is entered via either the interface on the Z-Xtreme

receiver or using the handheld and field application software.

Entry of point attribute information into the GPS receiver during data collection

is optional. During data processing, point attribute information can be

manually transferred from the observation log sheets into the processing

software prior to processing of the data. If the attribute information is entered

into the receiver during data collection, this manual entry step during data

processing can be skipped.

8. Verify operation

Perform the following observations to determine if the GPS system is

functioning properly:

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