introduction to mapping · 2020-01-21 · collecting field data compass navigation digital...
TRANSCRIPT
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Michael I Jones, PhD
UC Cooperative ExtensionForestry AdvisorMendocino, Lake, and Sonoma, Co.
Slides adapted from Ariel Thomson, Ricky Satomi, and UC IGIS
Introduction to MappingWe’re not lost
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Why?
▪ Necessary for management plan
▪ “Big Picture” view of yourforest
▪ Identify: boundaries (property, unit, etc.), forested areas for treatment, important features, etc.
▪ Help you identify your objectives
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Example Map
Jason Wells
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Key Ingredients
▪ Data Layers
▪ Point and Line Features
▪ Label, Label, Label
Collecting Field Data
▪ Compass Navigation
▪ Digital Navigation
What’s in a Map?
Image credit: ESRI
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Step 1: Layer your Ingredients
Features
Background
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▪ Satellite
▪ Contour Map
▪ Assessor Parcel Map
Step 2(a): Locate Background Layer
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▪ Satellite
▪ Contour Map
▪ Assessor Parcel Map
Step 2(a): Locate Background Layer
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Step 2(b): Locate Features
a single ‘thing’ on the ground
Tree Location
Contours Rivers
Parcels and Roads
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▪ Title
▪ North Arrow
▪ Scale
Step 3: Stack and Label
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(1) Map and
compass
PointsCollecting Features
(2) Handheld GPS Systems
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▪ Initiated after Revolutionary War around 1785.
▪ System to distribute land to Revolutionary War soldiers and later Railroad Companies
▪ Created section grid system with physical monumented survey corners
▪ Survey based on base lines (horizontal) and meridians (vertical)
Public Land Survey System (PLSS)
US BLM
Daniel Palma
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Compass and Map
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▪ 24 -32 active NAVSTAR satellites make up civilian GPS
▪ At least 6 satellites are visible from any spot on Earth
▪ 6 orbit planes, each with 4 operational satellites in each
▪ Orbiting 12,500 miles above earth at ~ 7,000 mph (medium Earth orbit)
▪ 2 complete orbits in less than 24 hours
▪ 4 or more GPS satellites used to compute X, Y, and Z
Global Positioning System
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Data Collection and Visualization
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Mobile MapsEXERCISE
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Avenza: Adding Basic Map
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Avenza: Adding Point Features
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Avenza: Other Features
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Compass and Map
1. Bring the paper map with you
2. Draw in the features you find and or would expect to find
Hands-on Activity
Digital GPS
1. Open the Avenza App
2. Add points for discrete features
3. Add lines for continuous features
Go into the field and map out the selected area. (Select One) of the mapping methods below to collect information about the features you find on the landscape. Locate as many as you can find, then meet back in the classroom to discuss.
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Found Features
▪ Road
▪ Unit Boundary
▪ Stream
▪ Stream Crossing
What did you find?
What else?
▪ Road Surface Type
▪ Condition of crossing
▪ Culvert type
▪ Tree health
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Example
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▪ Export layers as kml
▪ Open in Google Earth
▪ Print as image
Export Map