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# 2102 Exam 1

### intro+Land Measurement

Question | Answer |
---|---|

Why do we need to inventory forest stands? | financial reasons management planning policy making research |

What is the main difference between sampling forest stands and sampling wildlife or fisheries population? | fish and wildlife move, making it more difficult to sample than trees |

I just bought a new 100-ft logger’s tape. What do I need to do before using it? | 1. find where 0 is 2. if its 10" or 12" |

If my pace is 12.4 paces/chain, how many paces do I need to cover a distance of 5.32 chains? | 12.4x5.32= 65.968paces multiply the numbers together, paces will be a bigger number |

If my pace is 13.1 pace/chain, and if it took me 145 paces to cover a distance AB, what is that distance in chains? | 145/13.1= 11.07ch divide, chains will be a smaller number |

I measured a distance and found it to be 25.81 chains by pacing, and 26.453 chains with the use of a measuring tape. What is my error percent in pacing? | error percentage= (total distance-paced distance/total distance)100 (26.453-25.81/26.453)100= 2.4% |

I paced a distance and calculate it in chains. How many decimals should I present the result? Explain | Paced- 2 decimals (approximate)/estimating= accurate to the nearest link measured- use 3 decimals to measure chains more accurate to nearest o.1 link |

Convert from one unit to another: 5.476 chains = ________ feet. 34 inches = ________ links. 73.61 chains = ________ mile. 450 sq.in. = ________ sq.ft. 78,124 sq.ft. = _________ acres. 54.7 sq.ch. = ________ acres. | 5.476 chains = 361.416 feet. 34 inches = 4.30 links. 73.61 chains = 0.92 mile. 450 sq.in. = 3.125 sq.ft. 78,124 sq.ft. = 1.793 acres. 54.7 sq.ch. = 5.47 acres. |

750 trees/ac = ________ trees/ha. 130 sq.ft./ac = ________ m2/ha. | 750 trees/ac = 1856 trees/ha. 130 sq.ft./ac = 30 m2/ha. |

Why is chain a preferred unit to measure length, as compared to feet? | 1. longer than a foot 2. easier to convert from CH2 to acres |

An observation is recorded as 7.600 inches, which implies a measurement that is precise to the nearest ______ inch. | thousandths |

Convert from S35W bearing to azimuth. | 215degrees SW |

Convert from 236 azimuth to bearing. | S56W |

1. you bought a new compass and used it to measure directions. You found out later that the declination on this compass was set at 0, instead of 5W which was the current declination at your locality. If the reading was N3W, what is the true bearing? | N2E |

From a given diagram, determine if it is east or west declination. | which ever side of the true north it is! |

. Suppose you want to measure direction, what are the first few things you have to do when you pick up a new compass? | 1. see if its bearing or azimuth 2. know each tick mark amount |

If you are walking in the direction of S35W, and now you want to turn 90 left, what is the bearing of the new direction? | S35E |

Same question as above, but you want to turn 180 instead | N35E |

What is the total interior angle of an n-sided polygon? | 180(n-2) |

Compute error of closure from a given closed traverse. | error of closer (%)= 100x (error of closing gap (ch)/total distance traveled (ch)) |

What is the name of the device used to measure map area? | planimeter/platometer, compass caliper |

What are the drawbacks of “metes and bounds” surveys? | it is a description rather than actual measurements, also outside world is variable. things can happen to trees, human error, and compass declimation |

. What is the name of the survey system that replaced the metes and bounds surveys? | US Public Land Survey System |

. What are the dimensions of a tract, township, and section? | tract: 24mi x 24mi township: 6mi x 6mi section 1mi x 1mi |

Identify on diagrams: township (e.g. T2S R3W), section, sub-section (e.g. E1/2 NW1/4), etc. | diagrams in notebook |

Given that the dot grids contain 25 dots per square inch, and that the scale of the map is 4 inches to the mile, compute area in acres of a tract covering 450 dots. | Xac = 40 x 450/25 = 720 4in = 80mi, 1in = 20mi, square 20mi = 40ac 40ac/25 dots = Xac/450 dots |

What does GPS stand for? What does GIS stand for? | GPS - global positioning system GIS - geographic information system |

Map scale: 1:300,000. I measured a tract 1.5 cm x 2 cm on the map. What is its area in hectares? Conversion factors: 1 m = 100 cm; 1 ha = 10,000 m2 | 1.5 cm x 2cm = 3cm^2 1cm = 300,000cm 3,000m 1cm2 = (3000)^2 m^2 |