Geoscience Reference
In-Depth Information
Figure 1.15 Kendrick Reservoir Motion X GPS Track. Source of base map: Esri software.
Use the distance tool to answer the following question: How far were the
farthest erroneous pieces from the lake? Although it depends on where you
measure from, some of the farthest erroneous pieces were 600 meters from
the lake. Click on each dot to access the date and time each track point was
collected. How long did the erroneous components last? Again, it depends on
which points you access, but the erroneous components lasted about 10 min-
utes. At what time did the erroneous track begin correctly following Kerski's
walk around the lake? This occurred at 11:12 a.m. on the day of the walk.
How many laps around the lake did the author walk? The author walked
three laps. How far apart are the track points, on average? The track points
are about 10 meters apart. How much time elapses, on average, between
each point? About 10 points were collected each minute, so the time between
each point is about six seconds. As is visible on the map, as time went on,
the smartphone did a better job of locking onto the available GPS satellites,
to the point where the author was able to draw some letters to the southwest
of the reservoir. Zoom to these letters. What letters was the author trying to
draw? How high is each letter? The author was trying to draw the word “GIS,”
and each letter is about 42 meters “high.” How does the spatial accuracy of
the smartphone and the GPS signals it uses affect how large the letters have
 
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