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trexr
applications in resource management

Josh Erickson

USDA-Forest Service

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About Me

  • Hydrologist (day job); Kootenai National Forest
2

About Me

  • Hydrologist (day job); Kootenai National Forest

  • Focus is leveraging computing platforms (R, Python, GEE) for resource management work.

3

About Me

  • Hydrologist (day job); Kootenai National Forest

  • Focus is leveraging computing platforms (R, Python, GEE) for resource management work.

  • In my free time I like work on open source packages in R; {tidyrgee}, {gwavr}, {whitewater}

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Shout out

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Shout out

Joe Fortier - Northern Region Geospatial Group

6

Shout out

Joe Fortier - Northern Region Geospatial Group

Sam Lammie - NRGG Program Manager

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Shout out

Joe Fortier - Northern Region Geospatial Group

Sam Lammie - NRGG Program Manager

weblidar-treetop - A lot of inspiration was built off of this!

8

Outline

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Outline

  • Quick overview of the app.
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Outline

  • Quick overview of the app.
  • Go through a demo of the app.
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Outline

  • Quick overview of the app.

  • Go through a demo of the app.

  • Possible use case (toy example).

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What is trexr?

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What is trexr?

  • {trexr} stands for Tree Exploration in R
14

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

15

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

  • Provides users the ability to look at canopy height models (CHM) in a few different ways.

16

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

  • Provides users the ability to look at canopy height models (CHM) in a few different ways.

    1. Descriptive Stats
17

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

  • Provides users the ability to look at canopy height models (CHM) in a few different ways.

    1. Descriptive Stats

    2. Graphs

18

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

  • Provides users the ability to look at canopy height models (CHM) in a few different ways.

    1. Descriptive Stats

    2. Graphs

    3. Interactive Maps

19

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

  • Provides users the ability to look at canopy height models (CHM) in a few different ways.

    1. Descriptive Stats

    2. Graphs

    3. Interactive Maps

    4. 3-d Visualization

20

What is trexr?

  • {trexr} stands for Tree Exploration in R

  • A free open source software (FOSS) application ( ); essentially a tool...

  • Provides users the ability to look at canopy height models (CHM) in a few different ways.

    1. Descriptive Stats

    2. Graphs

    3. Interactive Maps

    4. 3-d Visualization

Units

  • Hopefully a tool for natural resource practitioners to use!
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Advantages vs. Disadvantages


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Advantages

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Advantages

  • Great for winter time eda or time sensitive analysis
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Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

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Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

  • Works well next to a GIS platform

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Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

  • Works well next to a GIS platform

  • Really helps with planning and visualizing outliers.

27

Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

  • Works well next to a GIS platform

  • Really helps with planning and visualizing outliers.

Disadvantages (IMO)

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Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

  • Works well next to a GIS platform

  • Really helps with planning and visualizing outliers.

Disadvantages (IMO)

  • Language specific (R)
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Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

  • Works well next to a GIS platform

  • Really helps with planning and visualizing outliers.

Disadvantages (IMO)

  • Language specific (R)

  • Not programmed asynchronously

30

Advantages

  • Great for winter time eda or time sensitive analysis

  • Crop images, different mapping layers, stats, etc.

  • Works well next to a GIS platform

  • Really helps with planning and visualizing outliers.

Disadvantages (IMO)

  • Language specific (R)

  • Not programmed asynchronously

  • Not a GIS

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DEMO


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Resource Applications

  • Explore some potential units for planning/recon, etc
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Resource Applications

  • Explore some potential units for planning/recon, etc

  • Good for winter time, safety reasons or quick eda

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Flow

  • Bring in units

Units

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Flow

  • Bring in units

Units

  • Extract CHM, stats, etc.

Units

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Flow

  • Bring in units

Units

  • Extract CHM, stats, etc.

Units

  • Visualise

Units

37

Stats

  • Some things that I've found useful are skewness, kurtosis and coefficient of variation (cv).
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Stats

  • Some things that I've found useful are skewness, kurtosis and coefficient of variation (cv).

Units

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Stats

  • Some things that I've found useful are skewness, kurtosis and coefficient of variation (cv).

Units

Units

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+−
pa_trees_sf - coefficient_of_variation
0.50.60.70.80.91.01.1

NA
1 km
3000 ft
Leaflet | Tiles © Esri — Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community
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Created with Highcharts 9.3.1SkewnessTree/AcreComparing CHM Skewness and Tree/Acrecolor is Coefficient of Variation (sd/mean)-0.5-0.2500.250.50.7511.251.51.7522.2505101520253035
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How to get trexr

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How to get trexr

Units

  • Or you can use with citrix! Follow these awesome tutorials by Joe Fortier to get you going!
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How to get trexr

Units

  • Or you can use with citrix! Follow these awesome tutorials by Joe Fortier to get you going!

  • Documentation from NRGG coming soon.

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The End

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About Me

  • Hydrologist (day job); Kootenai National Forest
2
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