Agenda ► This week:  Map and compass practicum  Field maps ► Walk and estimate distances  Add bearings, scale  Sampling  Sampling statistics: Why.

Slides:

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Presentation transcript:

Agenda ► This week:  Map and compass practicum  Field maps ► Walk and estimate distances  Add bearings, scale  Sampling  Sampling statistics: Why randomness?

Compass and Map Field walking and orienting site features.

Before you begin ► You need to know your stride length  Set up a 100 ft tape and walk from 0 to 100 feet in a natural stride while counting steps.  Repeat 4 times  Add up the number of steps for all 4 trials  Divide the number of steps into 400. This is your average stride length. You can now estimate distance by counting strides.  How might this vary with terrain?

To orient a compass ► We will use a handy web site for compass preparation. ► Remember: the red arrow always points to magnetic north, not in the direction you want to go. ► The degree plate on a compass will turn to allow you to make measures or set a bearing.

Useful websites ► r/compass1.htm r/compass1.htm r/compass1.htm ► /facts/pdfs/fs pdf

To follow a course ► Find north, line up the needle and the arrow at 0/360 degrees ► Turn toward the direction you want to go. Realign the arrow on the plate with the needle. ► Read the degrees that now are showing at the top of the compass.

Phase I survey: Walking a compass transect. Line-of-sight.

Continuing on course ► Make a line of sight reading on a distant feature. As long as the needle stays aligned with the arrow and you aim at your distant line-of-sight target you will be on course. ► To change course you can again turn the plate to a new heading or to a specified bearing. Sight on a new feature and proceed.

To determine an alignment of a feature, such as a building. ► Orient yourself in such a place that will allow you to look along the feature’s axis. ► Align the compass so that the long edge is parallel to the feature. ► Adjust the arrow plate until it is aligned with the north arrow. ► Read the degrees (your bearing) from the scale at the top of the compass.

Compass and topo map ► Reading a topographic maps ► Understanding landform features and landscape ► bols/

Compass course ► Follow compass bearings and distances from station to station to retrieve tags. ► At each station there will be new bearings given to the next station. ► Use pacing to determine distances. ► Hand in all tags at completion of the course.