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ЗТК III курс soil management.doc
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II. Match Ukrainian and English equivalents:

  1. modern theodolite

  2. reading out circles

  3. rotary encoder

  4. electronic measurement of time differences

  5. focal plane

  6. residual target offset

  7. embedded software

  8. electro-optical distance measuring device

  9. three-dimensional vectors

  10. pre-existing coordinate system

  11. mapping surveying

  12. saving data

  13. external data storage device

  1. вимірні вектори

  2. залишкове відхилення цілі

  3. обертальний кодуючий пристрій

  4. фокальна плоскість

  5. картографування

  6. зовнішній пристрій для збереження інформації

  7. раніше існуюча система координат

  8. вбудоване програмне забезпечення

  9. електрооптичний пристрій для вимірювання відстані

  10. електронне вимірювання різниці часів

  11. зчитування окружностей

  12. сучасний теодоліт

  13. збереження даних

III. Read and translate the text: Modern theodolites

Modern theodolite Nikon DTM-520. In today's theodolites, the reading out of the horizontal and vertical circles is usually done electronically. The readout is done by a rotary encoder, which can be absolute, e.g. using Gray codes, or incremental, using equidistant light and dark radial bands. In the latter case the circles spin rapidly, reducing angle measurement to electronic measurement of time differences. Additionally, lately CCD sensors have been added to the focal plane of the telescope allowing both auto-targeting and the automated measurement of residual target offset. All this is implemented in embedded software.

Also, many modern theodolites are equipped with integrated electro-optical distance measuring devices, allowing the measurement in one go of complete three-dimensional vectors -- albeit in instrument-defined polar co-ordinates -- which can then be transformed to a pre-existing co-ordinate system in the area by means of a sufficient number of control points. The technique is called free station position surveying and is widely used in mapping surveying. The instruments, "intelligent" theodolites called self-registering tachometers or "total stations", perform the necessary operations, saving data into internal registering units, or into external data storage devices. Typically, ruggedized laptops or PDAs are used for this purpose.

IV. Answer the questions:

1. How is the reading out of the horizontal & vertical circles done in today’s theodolites?

2. What is reading done by?

3. What types of encoder are mentioned in the text?

4. What is angle measurement reduced to?

5. What do CCD sensors allow?

6. What do electrooptical distance measuring devices allow?

7. What technique is used in mapping surveying?

8. What are “total stations”?

9. What are the functions of “total station”?

V. Match the term with its definition:

  1. encoder -

  2. CCD sensor -

  3. electro-optical distance measuring device -

  4. total station -

  1. “intelligent” theodolite;

  2. the device implemented in embedded software;

  3. the equipment read out the horizontal and vertical circles;

  4. the instrument allows the measurement in one go of complete three-dimensional vectors