Managing Multiple Track Segments with DNR Garmin

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Managing Multiple Track Segments with DNR Garmin
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Objectives
Using DNR Garmin Download tracks Save track
segments to shapefiles
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Summary of Topics

• Multiple Track Features Scenario
• Download Tracks
• Save Polygon Feature as Shapefile
• Save Line Features as Shapefiles

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Data Collection Scenario

• Collected one polygon feature
• Saved Track (needed fire acres)
• Collected two line features

Dozer Line
Hand Line
3 Separate Track segments in the Active Track Log
Fire Perimeter
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Data Summary

• Have (GPS)
• 3 track segments
• polygon
• line
• line
• 1 saved track
• polygon

• Need (GIS)
• 1 fire perimeter polygon
• 1 dozer line
• 1 hand line

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Goal Save All Track Points to Single Shapefile
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Select Track Download
Download transfers a copy of data, does not
remove data from receiver
verify Coordinate System
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View Track Data Table
show/hide data table
scrollbar
scrollbar
resize window
watch download
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Select All Active Log Track Points
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...Save...
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...As Text File First!
A Text File should always be saved First as a
back up file to the ESRI (ArcView) Shapefile
Name should indicate all track points 20080319_rxw
ui_alltrackpts
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Status Window
Name 20080319_rxwui_alltrackpts.txt
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...Save Again...
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...As ArcView Shapefile...
Note points files already there
Projected shapefile uses projected coordinates.
Unprojected shapefile uses WGS84 coordinates.
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...As a Point
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Status Window
Name same as text file, extension
different 20080319_rxwui_alltrackpts.shp
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Locate Shapefile
Note file path
Note additional files
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Goal Save Multiple Shapefiles
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Select First Track Segment

• First segment is fire perimeter
• Second segment is dozer line
• Third segment is
• hand line

Select the first Active Log track segment
light blue-start of new track segment
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...Save...
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...As Text File First!
A Text File should always be saved First as a
back up file to the ESRI (ArcView) Shapefile
Name should indicate feature type 20080319_rxwui_p
erim.txt
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...Save Again...
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...As ArcView Shapefile...
Note all track points file already there
Name should indicate feature and shape type
20080319_rxwui_perim_pts.shp
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...As a Point
- Save to a Point Shape to ensure integrity -
Save to a Polygon ONLY if you are sure your data
is perfect
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...Save Again to ArcView Shapefile...
Note all track points file and perimeter points
listed
Name should indicate feature and shape type
20080319_rxwui_perim_poly.shp
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Save to Polygon
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Check Saved Files
Text file of all Active Log track points
Point shapefile of all Active Log track points
Point shapefile of fire perimeter track points
Text file of fire perimeter track points
Polygon shapefile of fire perimeter
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Lets Peek at your Work!
Give both shapefiles to GIS Specialist
Great!
Point Shapefile 20080319_rxwui_perim_pts.shp
Polygon Shapefile 20080319_rxwui_perim_poly.shp
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Select Second Track Segment

• First segment is fire perimeter
• Second segment is dozer line
• Third segment is
• hand line

light blue - start of new track segment
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...Save...
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...As Text File First!
A Text File should always be saved First as a
back up file to the ESRI (ArcView) Shapefile
Name should indicate feature type 20080319_rxwui_d
zline
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...Save Again...
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...As ArcView Shapefile...
Note other shapefiles
Name should indicate feature type
20080319_rxwui_dzline.shp
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...As a Point or a Line???
Point Shape ensures integrity
You can save to a Line ONLY if you are sure your
data is perfect
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Check Saved Files
Text file of Dozer Line
Shapefile of Dozer Line
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Select Third Track Segment

• First segment is fire perimeter
• Second segment is dozer line
• Third segment is
• hand line

last segment in table
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...Save...
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...As Text File First!
A Text File should always be saved First as a
back up file to the ESRI (ArcView) Shapefile
Name should indicate feature type 20080319_rxwui_h
andline
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...Save Again...
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...As ArcView Shapefile...
Note other saved shapefiles
Name should indicate feature type
20080319_rxwui_handline.shp
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...As a Point or a Line???
- Point Shape ensures integrity - Save to a Line
ONLY if you are sure your data is perfect
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Check Saved Files
Text file of Hand Line
Shapefile of Hand Line
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Review of Topics

• Multiple Track Features Scenario
• Download Tracks
• Save Polygon Feature as Shapefile
• Save Line Features as Shapefile

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Final Data Review Question

• GPS
• 3 track segments
• polygon
• line
• line
• 1 saved track
• polygon

• GIS
• 1 fire perimeter polygon
• 1 dozer line
• 1 hand line

All GIS shapefiles came from Active Track
Why didnt we use Saved Perimeter Track?
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Compare Geometry
Active Track Log
Saved Track
Which would be a better representation on a map?
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Compare Area Calculations
Active Track Acres Calculated in ArcGIS
Saved Track Acres Calculated in GPS
Saved Track Good estimated Acres!
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Review of Topics

• Multiple Track Features Scenario
• Download Tracks
• Save Polygon Feature as Shapefile
• Save Line Features as Shapefiles

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Conclusions

• Active Track Log
• Actual GPS positions
• Good depiction of features
• Saved Track
• Saves critical GPS positions only
• Creates linear shapes for curved features
• Good approximate acre calculation

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