- Pengertian
- Syarat – syarat theodolite
2.sumbu kedua haarus benar – benar mendatar.
3.garis bidik harus tegak lurus sumbu kedua / mendatar.
4.tidak adanya salah indeks pada lingkaran kesatu.
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Diposting oleh Unknown on Sep 29, 2009
Diposting oleh Unknown on Aug 21, 2009
survei dengan menggunakan theodolite dilakukan bila situs yang akan dipetakan luas dan atau cukup sulit untuk diukur, dan terutama bila situs tersebut memiliki relief atau perbedaan ketinggian yang besar. Dengan menggunakan automatic level atau theodolite total station ini, keseluruhan kenampakan atau gejala akan dapat dipetakan dengan cepat dan efisien (farrington 1997).
Alat-alat yang diperlukan: sebuah survey theodolite, tripod, levelling stave, buku catatan, pensil, patok berbendera untuk menandai situs.
Cara pembacaan sudut berbeda antara satu tipe alat theodolite dengan tipe yang lain. Tiap alat theodolite mempunyai sebuah skala vernier. Skala ini akan memberikan hasil pembacaan derajat dan menit.
http://dsanji.blogspot.com
Diposting oleh malamjumat on Aug 5, 2009
Theodolite is a measuring instrument capable of measuring azimuth and elevation angles to very high accuracy. When computing power and high precision laser distance measuring capability is added, the laser theodolite that results can measure or locate three dimensional "point-in-space" positions within a sphere of 5 millimeter radius.
I had previously surveyed this site with the instrument, including all the buried pipe and conduit runs as I installed them. The lower line of posts for the solar structure are dangerously close to the septic leach field, so it was important to place them accurately to avoid augering into a septic line.
Moreover I believed that precision placement would be critical to the success of erecting the support structure. It's hard enough to thread a lot of heavy precut pipes together in mid-air, but sloppy tolerances would make this 100-foot long monster the mother of all plumber's nightmares.
Using the laser theodolite is a 2-person procedure - one at the instrument and one at the cooperative retro-reflector target. When the laser theodolite level locates a stakeout point it displays the distance to that spot and projects a pair of parallel visible laser beams right to the spot. One beam blinks and the other is solid. The target person can pace the indicated distance, then look back and move from side to side to reach the point where the beam transitions from blink to solid. The target is thus placed and another measurement reveals the error for another try. This iterative procedure quickly converges on the precise location.
Elaine (my wife) is not a technocrat and therefore has limited patience as the target person. So I constructed a replacement for her. It is a simple XY table, made of waxed MDF, with leveling feet and a mount for the retro-reflector target.
The XY table is placed at an approximate location facing the laser theodolite, which measures its location and indicates the error in XY movement. If the error is large, the table must be relocated by the approximate amounts. If the error is small, the table is moved in its ways by the indicated amounts. Another measurement is taken and the procedure repeats. When the measured error is acceptable (usually after three measurements) the retro-reflector is lifted from the table and a marker spike is dropped through the hole into the ground.
http://prossen.com
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Diposting oleh malamjumat on Jul 30, 2009
Diposting oleh Unknown on Jul 14, 2009
in today's theodolites laser auto level and theodolites laser liner, 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 theodolite laser auto level and theodolites laser liner 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 laser theodolite and theodolite level, costing up to $10,000 apiece, are equipped with integrated electro-optical distance measuring devices, generally infrared based, 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. this technique laser theodolite and theodolite level is called a resection solution or free station position surveying and is widely used in mapping surveying. the instruments theodolite, "intelligent" level theodolite called self-registering tacheometers or "level theodolite 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 as data collectors for this purpose.
http://en.wikipedia.org/wiki/theodolite
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Diposting oleh Unknown on Jul 10, 2009
http://en.wikipedia.org/wiki/theodolite
Diposting oleh Unknown on Jun 30, 2009
Diposting oleh Wikey on Jun 23, 2009
Untuk menentukan titik utara selatan terdapat beberapa cara, yaitu dengan menggunakan alat theodolite dari toko alat survey, alat survey tongkatistiwa (sundilan), teropong, kompas. Di antara cara-cara tersebut di atas, yang paling mudah, murah, dan memperoleh hasil yang teliti adalah dengan mempergunakan tongkat istiwa atau alat theodolite.
Caranya, tancapkan sebuat tongkat lurus atau theodolite pada sebuah pelataran datar yang berwarna putih cerah. Panjang tongkat theodolite sekitar 30 cm dan berdiameter satu cm. Ukurlah dengan lot dan waterpass sehingga pelataran betul-betul datar dan tongkat betul-betul tegak lurus terhadap pelataran. Lalu, lukislah sebuah lingkaran berjari-jari sekitar 20 cm yang berpusat pada pangkal tongkat tadi.
Kemudian, amati dengan teliti bayang-bayang tongkat beberapa jam sebelum tengah hari sampai sesudahnya. Semula, tongkat akan mempunyai bayang-bayang panjang menunjuk ke arah Barat. Semakin siang, bayang-bayang semakin pendek, lalu berubah arah sejak tengah hari. Kemudian semakin lama bayang-bayang akan semakin panjang lagi menunjuk ke arahTimur. Dalam perjalanan seperti itu, ujung bayang-bayang tongkat akan menyentuh lingkaran sebanyak dua kali pada dua tempat, yaitu sebelum tengah hari dan sesudahnya.
Selanjutnya kedua sentuhan itu kita beri tanda dan hubungkan antara keduanya dengan garis lurus. Garis ini merupakan arah Barat-Timur secara tepat. Lalu lukislah garis tegak lurus pada garis Barat-Timur tersebut, maka akan memperoleh garis Utara-Selatan yang persis menunjuk titik Utara sejati.
bakosurtanal.go.id/
Untuk informasi lebih lanjut, silahkan lihat di Alat Survey ~ Jual Alat Survey ~ Toko Alat Survey ~ Survey Theodolite ~
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