Nanjing Hanzhong mapping equipment Co.,Ltd. |
|
High accuracy HTS-220R total station without prism
Chinese Popular Cheap and Fine Total Station for Sale
*Detail data of the Cheap and Fine Total Station:
***Brief Description of Important Operations***
Distance Measurement: Electronic distance measuring (EDM)
instrument is a major part of total station. Its range varies from
2.8 km to 4.2 km. The accuracy of measurement varies from 5 mm to
10 mm per km measurement. They are used with automatic target
recognisers. The distance measured is always sloping distance from
instrument to the object. Angle Measurements: The electronic
theodolite part of total station is used for measuring vertical and
horizontal angle. For measurement of horizontal angles any
convenient direction may be taken as reference direction. For
vertical angle measurement vertical upward (zenith) direction is
taken as reference direction. The accuracy of angle measurement
varies from 2 to 6 seconds.
***Data Processing of the Cheap and Fine Total Station***
This instrument is provided with an inbuilt microprocessor. The
microprocessor averages multiple observations. With the help of
slope distance and vertical and horizontal angles measured, when
height of axis of instrument and targets are supplied, the
microprocessor computes the horizontal distance and X, Y, Z
coordinates. The processor is capable of applying temperature and
pressure corrections to the measurements, if atmospheric
temperature and pressures are supplied.
Display: Electronic display unit is capable of displaying various
values when respective keys are pressed. The system is capable of
displaying horizontal distance, vertical distance, horizontal and
vertical angles, difference in elevations of two observed points
and all the three coordinates of the observed points.
Electronic Book: Each point data can be stored in an electronic
note book (like compact disc). The capacity of electronic note book
varies from 2000 points to 4000 points data. Surveyor can unload
the data stored in note book to computer and reuse the note book.
***Use of Cheap and Fine Total Station***
The instrument is mounted on a tripod and is levelled by operating
levelling screws. Within a small range instrument is capable of
adjusting itself to the level position. Then vertical and
horizontal reference directions are indexed using onboard keys. It
is possible to set required units for distance, temperature and
pressure (FPS or SI). Surveyor can select measurement mode like
fine, coarse, single or repeated.
When target is sighted, horizontal and vertical angles as well as
sloping distances are measured and by pressing appropriate keys
they are recorded along with point number. Heights of instrument
and targets
can be keyed in after measuring them with tapes. Then processor
computes various information about the point and displays on
screen. This information is also stored in the electronic note
book. At the end
of the day or whenever electronic note book is full, the
information stored is downloaded to computers.
The point data downloaded to the computer can be used for further
processing. There are software like auto civil and auto plotter
clubbed with AutoCad which can be used for plotting contours at any
specified interval and for plotting cross-section along any
specified line.
***Advantages of the Cheap and Fine Total Stations***
The following are some of the major advantages of using total
station over the conventional surveying instruments:
1. Field work is carried out very fast.
2. Accuracy of measurement is high.
3. Manual errors involved in reading and recording are eliminated.
4. Calculation of coordinates is very fast and accurate. Even
corrections for temperature and pressure are automatically made.
5. Computers can be employed for map making and plotting contour
and cross-sections. Contour intervals and scales can be changed in
no time.
However, surveyor should check the working condition of the
instruments before using. For this standard points may be located
near survey office and before taking out instrument for field work,
its working is checked by observing those standard points from the
specified instrument station.