Oregon County Surveyors

The purpose of this Association is to promote public works activities, including the construction and maintenance of roads and appurtenances to recognized engineering standards in the counties; to promote the professional application of land surveying; to promote the ethical practices of these professions; and by the exchange of ideas, give all counties in Oregon the advantages of these professions in all phases of county services.

http://www.aocweb.org/surveyors/

Nikon NPL-632 Total Stations deliver a versatile, easy-to-use platform to help you get the job done right

NIKON NPL-632

$8,610.00

Nikon NPL-632 Total Stations deliver a versatile, easy-to-use platform to help you get the job done right. Featuring a CompactFlash (CF) slot and a USB port, the NPL-632 total station make data transfer a breeze. The NPL-632 has reflectorless capabilities that expand the environments you can survey without sacrificing speed or accuracy—you can survey in areas where using a prism would be impossible or dangerous. Up to 650' away to most surfaces, the NPL-522 maintains mm accuracy and pin-point sighting. The Nikon exclusive focus targeting system eliminates reflected shot distance errors experienced by other brands. 1" Angle Reading / 2" Din / 650' Prismless Range / 16,400' EDM Range with single Prism / 26X Scope / Long Battery Life / Waterproof IPX-6 Construction

Combined with the powerful On-Board Data Collection ,
Stakeout & COGO software this multi-media , Prismless
Total Station is a turnkey stand alone solution for most any
Land Surveying application. The USB memory slot accepts
any STD USB memory stick and allows (with the included
PC software "Connex") , the fastest dtat mamgement in the
business.

BTS series Total Station

Product Description

Index: Telescope
Length of sleeve: 150mm
Aperture: 45mm
Telescope: 30x
Image: Erect
Field of view : 1o30'
Shortest distance: 1.5m

Electronic measurement:
Mode of measurement: Measuring Mode
Signal collection: 2 Signals for horizontal 1 Signal for vertical
Accuracy: 2"
Minimum reading: 1"/5"
Diameter of circles: 71mm
LCD: Double Chinese digital

Compensator
Sensor: Compensation
Range of compensation: +/-3'
Accuracy of compensation: +/-5"

Date communication
Date output interface: RS232C

Optical plummet
Magnification: 3x
Field of view: 5o
Range of focusing: 0.5m-infinite

Bubble
Plate level: 30"/2mm
Circular level: 8'/2mm

Lllumination
LCD: yes

Battery:
Specification: Rechargeable batteries
Time Complete unite: 4h
Time Angle measurement: 20h
Voltage: 7.2V
Capability: 2.2Ah

Instrument
Dimension: 114x375x342
Weight: 5.6Kg

Measuring distance
Measurement: 1.5Km/single prism 2.1Km/triple prisms
Measuring accuracy: +/-(5mm+3ppm)

Minimum reading
Measuring mode: 1mm(0.001ft)
Tracking mode: 10mm(0.01ft)

Measuring speed
Accurate measuring mode: 2.5seconds
Tracking mode: 0.5seconds
Range of atmosphere correction: -99ppm-+99ppm (step 1ppm)
Range of prism constant correction: -99ppm-+99ppm (step 1ppm)

Memory points inside: 8000

Theodolite Survey in surveying theory and practice

To verify the reliability of the Survey of some map, we decided to test the angular distances between monuments using a theodolite. a tall multi-storied building was selected as the base of the theodolite readings. The roof offers a good view of all the main monuments.

The theodolite was calibrated and aligned to magnetic north (MN) with a compass and positioned on the south-east corner of the building. Readings were taken in clockwise order from MN, starting with site no. 1. The angular difference between a) two monuments and b) the gross offset from MN was measured and recorded. Due to obstruction by a water tank of the field of view between angles 240° and 350° along the Western horizon, the theodolite was repositioned on the NW corner of the building, reset and re-calibrated with the standard reference and the NS baseline. Due to these adjustments, both theodolite positions can be taken as one, called TP. Interestingly, no monuments were found in line with magnetic north or south, such that the north-south is not emphasised. In contrast, the east-west line is prominently represented in both the terrestrial and celestial schemes. To us, this suggests that the east-west line is the more important basis of calculation in astronomy.

Moments in Kentucky Legislative History

In a step toward settling Kentucky’s boundary dispute with Tennessee, the Kentucky General Assembly gave final approval on November 22, 1821, to a line marked by William Steele, surveyor for Kentucky, and Absalom Looney, surveyor for Tennessee. The entire dispute between the two states was not completely settled until 1859 with a boundary that cost Kentucky a considerable amount of territory.

Surveyor’s theodolite used by Robert Alexander to survey the southern border of the Jackson Purchase. At the behest of the legislature, Alexander was appointed by Gov. Gabriel Slaughter in 1819 to survey the Kentucky-Tennessee border in the former Chickasaw land between the Tennessee and Mississippi Rivers. Donated by Alex Alexander. KHS Collections.

THeodolite Optical

Product Description

Geo-Tech's best selling 5" electronic theodolite 
without compensator 

Features:  
Water resistant, sealed construction 
2 large LCD panels with easy to read numbers 
state of the art glass encoder 
Switchable horizontal and vertical angle readout 
Built in cross hair and display panel illumination 
Rechargeable on board battery & dry battery box supplied 
removable tribrach for multiple set ups 

Specifications  
Telescope: upright image 
Length: 155mm 
Objective aperture: 45mm 
Magnification: 30X 
Field of view: 1degree 30' 
Resolving power: 2.5" 
Shortest focus distance: 1.3m 
Electronic angle measurement: 360 or 400g 
Min. reading: 1"/5" 
Accuracy: 5" 
Optical plummet: 
Mag. 4x 
Field of view: 5degree 
Focusing range: 0.5m- 
Power supply: 
AAx4 (6hrs) 
rechargeable battery: 6v(15hrs) 
Weight: 4.4kg/6.8kg with case

Packing:	1unit/ctn
Model NO.:	GTH-05
Standard:	Export Standard
Productivity:	500units/year
Unit Price/Payment:	T/T, L/C
HS Code:	90152000
Trademark:	Geo-Tech,Neutural Packaging or customer's brand
Origin:	China
Min. Order:	10units
Transportation:	By air, by sea or by courier

Diagram of a Pibal Theodolite

This is a illustration depicting David White 6061, 47 and early Warren-Knight models 47, 474 and 84 etc. Pibal Theodolites. A few units were also produced in the 1940's by Seiler Instruments under contract. The illustration and units mentioned above differ slightly from the current Warren-Knight production units in the style of the battery case. See the Pibal Models pages located on this site for for information on the variants of theodolites that are similar to this one as well as some interesting others.

Note that Warren Knight also makes a digital unit that looks quite a bit different than this one. Other digital theodolites as well as currently marketed balloon theodolites are featured on the Manufacturer's Pages on this site.

There are at least three prism types used in balloon theodolite optical paths, and a radically different optical path utilized in a marine theodolite.

surveying in operation

Triangulation, as invented by Gemma Frisius around 1533, consists of making such direction plots of the surrounding landscape from two separate standpoints. After that, the two graphing papers are superimposed, providing a scale model of the landscape, or rather the targets in it. The true scale can be obtained by just measuring one distance both in the real terrain and in the graphical representation.

Modern triangulation as, e.g., practiced by Snellius, is the same procedure executed by numerical means. Photogrammetric block adjustment of stereo pairs of aerial photographs is a modern, three-dimensional variant.

In the late 1780s Jesse Ramsden, a Yorkshireman from Halifax, England who had developed the dividing engine for dividing angular scales accurately to within a second of arc, was commissioned to build a new instrument for the British Ordnance Survey. The Ramsden theodolite was used over the next few years to map the whole of southern Britain by triangulation.

In network measurement, the use of forced centering speeds up operations while maintaining the highest precision. The theodolite or the target can be rapidly removed from, or socketed into, the forced centering plate with sub-mm precision. Nowadays GPS antennas used for geodetic positioning use a similar mounting system. The height of the reference point of the theodolite—or the target—above the ground benchmark must be measured precisely.

The American transit gained popularity during the 19th century with American railroad engineers pushing west. The transit replaced the railroad compass, sextant and octant and was distinguished by having a telescope shorter than the base arms, allowing the telescope to be vertically rotated past straight down. The transit had the ability to 'flop' over on its vertical circle and easily show the exact 180 degree sight to the user. This facilitated the viewing of long straight lines, such as when surveying the American West. Previously the user rotated the telescope on its horizontal circle to 180 and had to carefully check his angle when turning 180 degree turns.