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18 Cabrillo College Engineering 1A - Surveying LABORATORY NO THEODOLITE: ANGLE ABOUT A POINT Objectives: To measure the angles about a point by repetition using a theodolite. Equipment: Theodolite, tripod, carpenter s level (?) Procedure: (1) Each survey crew will choose one of the triangles used in Lab No. 2. (2) Set up your tripod (without the theodolite) in the center of your triangle so that the plate (flat part on top) is approximately horizontal. (3) Connect the theodolite to the tripod by use of the screw under the tripod. Position the theodolite in the center of the tripod. (4) Level your instrument and rotate the theodolite in different positions (90, 180, 270, & 360 ) ensuring that the instrument is indeed leveled. (5) Once leveled, look through the optical plumb. The location you see on the ground will be Point X. (6) Check the leveling and repeat Step No. 5 if necessary. (7) Focus the telescope and the eyepiece to eliminate parallax. (8) Measure the angle clockwise between Points A & B, Points B & C, and Points C & A with the angle set back to zero at the start of each measurement. The angles will be measured by repetition (demonstrated in class). Report the angle to the smallest increment that can be measured with your theodolite. Note: Each survey crew member will have her/his own notes. (9) Compute the average angle from the angles measured by repetition. (10) Sum up the average measured angles. (11) Compute the angle closure as compared to ' or ' 00". Rev 10/5/ kh
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20 Cabrillo College Engineering 1A - Surveying 113 LABORATORY NO THEODOLITE: INTERIOR ANGLES Objectives: To measure the interior angles of a triangle by repetition using a theodolite. Equipment: Theodolite, Tripod, Carpenter s Level (?) Procedure: (1) A triangle with a set of three monuments (ginnies) labeled A, B and C will be assigned to each party. (2) Set up your tripod (without the theodolite) over Point A so that the plate is approximately horizontal. (3) Connect the theodolite to the tripod by use of the screw under the tripod. Position the theodolite in the center of the tripod. (4) Check height of instrument, making sure eyepiece is at a comfortable height to look through. (5) Step down on one leg of the tri-pod and position yourself on the opposite side of the tripod between the two other legs. (6) Adjust legs to level top plate of tripod. (7) Look through the optical plumb while holding onto two tripod legs. Using the third (opposite leg) as a pivot point, rotate or move up and down until you see the tac through the optical plumb. (8) Level your instrument and rotate the theodolite in different positions (90, 180, 270, & 360 ) ensuring that the instrument is indeed leveled. (9) If the optical plumb does not site in the center of the iron stake, loosen the screw connecting the theodolite and the tripod (do not unscrew completely) and slide the theodolite along the plate until the optical plumb sites in the center of the iron marker. (10) Check the leveling and repeat from Step No. 4 if necessary. (11) Focus the telescope and the eyepiece to eliminate parallax. (12) Measure angle A by siting in Point B at 00 00' 00" and turning the theodolite clockwise to Point C. The angles will be measured by repetition. NOTE: Report all angles to the smallest increment that can be measured with your theodolite. (13) Move theodolite and set up on Point B. Repeat Steps 3 to 7. (14) Measure angle B by sitting in Point C at 00 00' 00" and turning the transit clockwise to Point A. The angles will be measured by repetition. Rev 10/5/ kh
21 113A (15) Move transit and set up on Point C. Repeat Steps 3 to 7. (16) Measure angle C by sitting in Point A at 00 00' 00" and turning the transit clockwise to Point B. The angles will be measured by repetition. (17) No magnet bearings will be measured for this lab. Computations: (1) Compute the average interior angles of the triangle from the angles measured by repetition. (2) Sum up the average measured angles. Be sure that the sum is within 01' N of the theoretical sum of ' 00", where N is the number of setups. (3) Adjust the angles by applying equal corrections to each angle. Adjusted values should be rounded off to the nearest 10, 1, 30", 10, etc... (whichever is the smallest increment of your instrument).
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23 Cabrillo College Engineering 1A - Surveying LABORATORY NO TOTAL STATION Objectives: To measure the interior angles of a traverse by repetition. To determine the horizontal lengths of all sides of a traverse. Equipment: Total station, tripod, prism and pole, extra battery, equipment manual Procedure: Interior Angle Measurement: (1) Each survey crew will choose one of the triangles used in Lab No. 2. (2) Set up your equipment on each point of the traverse and measure the interior angle by repetition. (3) Compute the average interior angles of the triangle from the angles measured by repetition. (4) Sum up the average measured angles. Be sure that the sum is within 01' N of the theoretical sum of ' 00", where N is the number of setups. (5) Adjust the angles by applying equal corrections to each angle. Adjusted values should be rounded off to the nearest 10, 1, 30", 10, etc... (whichever is the smallest increment of your instrument). Horizontal Distance Measurement: (1) Measure the horizontal distances of AB, BC and CA forward and backward. (2) Compute the average horizontal distance of each side of the triangle. The required precision of 1/5000 should be achieved. If the result is not within the 1/5000 allowed, the line must be remeasured.
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25 Cabrillo College Engineering 1A - Surveying LABORATORY NO TOPOGRAPHIC MAPPING Objective: To produce a topographic map of a 10,000 square-foot area on Cabrillo s campus. Equipment: To be decided by survey crew. Procedure: (1) Choose a method of survey to determine the horizontal and vertical control of points. (2) Set up your field books clearly. (3) Choose an area whose size is at least 10,000 square feet. Be sure that the area chosen has an elevation change of at least 10 feet. Be sure that your area is bordered on sides by natural or artificial boundaries such as road, curb, tress, bottom of slope, etc (4) Choose a sufficient number of control points and determine their locations and elevations. These control points should include points on the boundary, high and low points and points where changes in slope occur. Also, locate all natural and artificial objects: trees, lights, water valves, drains, lawn boundaries, etc... Computation/Mapping: (1) Choose the scale, contour interval, and indexed contours for your topographic map. (2) Draw a topographic map with contour lines to scale using AutoCAD or another CAD package. [Contour lines may be drawn by hand with a black pen.] (3) Using the CAD software, plot the points on one layer, sketch the artificial/natural features (curbs, sidewalks, lawns, trees, etc ) on another layer, and the contour lines on another layer (contour lines can be drawn by hand). Notes: Plot the control points on your map with the point numbers above the point and the elevations below the point. Do not draw the contour lines on concrete or asphalt roads/paths, etc (4) Be sure to include the following: >Border: thick line ~1/4 from the edge of the paper with a title block (box) including the title, your company name, drawn by and date, checked by and date, scale. >Legend: box including the graphical symbols you have used with the features that they represent. What to turn in? Printout of the topographic map showing natural and artificial features and the contour lines (no point elevations except high or low points). Photocopy of the field book pages of all your survey crew showing the topo lab. the topo map with all layer thawed.
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27 120 Cabrillo College Engineering 1A --- Surveying LABORATORY NO COUNTY MAP INFORMATION Laboratory Assignment: Property Information and Maps Santa Cruz County Building 701 Ocean Street, Santa Cruz Please Note: Please go in groups of two or three. Go straight to the offices below --- do not go to the information desk. Follow the directions below --- ask for help only if you are totally lost. If you ask questions, introduce yourself as a Cabrillo engineering student. Your research at the county building will take you 1-2 hrs. Go to the Assessor s Office (1st Floor) [8am-5pm confirm on-line before you go]: 1. a. Using the Assessor s Map (colorful map on counter), find the approximate location of your property. b. Determine the map book number (circled number) from the Assessor s Map. c. Request the map book (by number) from the counter person. d. Turn to the page in the book that your property is on. This is your Parcel Map. e. Purchase a copy of the assessor s parcel map containing your property. (~$2.50) f. Determine the page number (upper right corner), the block number (~1/3 circle), and the parcel number (~1/4 circle). What is your Assessor s Parcel Number (APN)? For example: where: 037 (map book no.) 04 (page no.) 1 (block no.) * 49 (parcel no.) * Note: If no block number is given, the block number is assumed to be Using the computer or the microfise (plates), look up your APN and determine the following: who owns the property \ when the owner bought the property when the house was built Land value of the property print out info if you want House improvement value size of land and house how many bedrms/bathrms any other info / 3. Determine the Document Reference number of your property deed. This number is actually the Book (or Volume) and Page No. of your property deed. NOTE: The Assessor s Office Information is also on line at Santa Cruz County GIS webpage: Navigate through the County GIS map to find the information you need as referenced in the above steps.
28 120A Go to the Recorder s Office (2nd Floor) [8am-4pm confirm on-line before you go]: 1. Knowing the Book and Page No. of your property deed, find your property deed on the computer. If your property deed is older than 1997, the document number will be referenced as year-doc# (e.g ). 2. If you would like a copy of your property deed, fill out the white form requesting a copy. It will copy you $2.00 per page. 3. Write down the legal description ( metes and bounds ) of your property from the deed. If your deed does not include a description, use the sketch on the deed or the Assessor s parcel map to write your own description. Go to the Surveyor s Office (4th Floor) [limited hours of service]:. The survey counter resources are available on the Department of Public Work website. The county GIS can be accessed from #3 on the survey counter web page. NOTE: The Base Map Information at the Surveyor s Office is on line at gis.co.santa-cruz.ca.us/internet/survey/viewer.htm The survey maps can be viewed & downloaded on the web site. What to turn in? Type up the following (no copies of printouts): 1. Your property address and APN. 2. Owner of property, when the owner purchased it, value of land and improvements, when the house was built, and any other info determined in Assessor s Office. 3. The metes and bounds (legal description) for your property as determined from the property deed. If a metes and bounds does not appear on the property deed, write one yourself. 4. Section and township or rancho the property is contained in. 5. Recorded maps associated with your property volume and page number. Draw the following (no copies of maps): A plan view of your property drawn to scale showing lengths and bearings of the sides of your property as determined from the property deed or from the survey information. (State where you got the information for the drawing.) Attach the following: Your assessor s parcel map.
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