Ashtech Z-Surveyor Service Manual download pdf (Page 47)

Survey Preparation & Execution 39

Surveying

while walking. The ability to determine positions while observing a feature for a

period of time and the ability to determine positions while moving around the project

site results in two modes of positioning features of interest with the rover system.

These two modes are termed Continuous Kinematic and Stop&Go Kinematic.

Continuous Kinematic

The Continuous Kinematic mode of data collection is best used when positioning

linear features such as roads. The idea is to trace the feature to be positioned. As

you are walking along this feature, positions are being determined at a specified

interval, delineating the feature. Here is an example where this would be useful:

You have an as-built survey which includes a road approximately 100 feet in

length. You need to position the centerline of the road and the edge of

pavement on both sides. You walk out to the centerline with the rover system.

Using the handheld software, you instruct the system to determine a position

every 2 seconds (a point ID is generated automatically every 2 seconds). You

then walk along the centerline from beginning to end. When this data is

processed, you will see the centerline of the road delineated with a position

every 2 seconds for the time period which you were walking along the

centerline.

The Continuous Kinematic method is not as precise as the Stop&Go

Kinematic method since, with Continous Kinematic, each position is

determined with only one data sample, while with Stop&Go Kinematic,

multiple data samples are combined to produce a position. With Continuous

Kinematic, you can expect positions at the 0.03 – 0.05 meter (0.10 – 0.15 ft)

level.

Stop&Go Kinematic

The Stop&Go Kinematic mode of data collection is best used when positioning point

features. It can also be used to position linear features by collecting multiple points

to delineate the feature. Here is an example of how the method works:

In the same as-built survey, you have a number of point features to locate,

such as light poles and manhole covers. You position the rover pole over the

point feature to be located. Using the handheld software, you instruct the

system to collect 8 seconds of data at this location. The handheld software

will assign the same point ID to each data sample collected. When this data is

processed, all data samples collected at this location will be used to compute

one position for the point feature.

630045.book Page 39 Sunday, February 11, 2001 11:38 AM

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 57 58

No comments

Ashtech Z-Surveyor Service Manual Page 47