Field trip

How high is that thing?

Yesterday in the Great Smokies
Webcam archive

GEO 409: Advanced GIS

Location & time

• POT's south courtyard
• 11 am, Thursday, March 13.

Set up

• Our maps show heights of above ground features.
  • height = DSM - DEM
  • Are they accurate?

Testing

• Measure the height of a feature in the field.
• Can we do everything we need on a phone?
• I'll use these apps: Avenza Maps and Theodolite (or similar trigonometry app).

2022 Case study

• Measure the height of a parking garage access ramp.
• DSM - DEM = 15' 3"
• Field measurement = 15' 2" using lidar Measure tool on iPhone.

Our study

• Measure the tree heights
• and compare to the height in our canopy model.

Phone requirements

• Load a height model map
• on Avenza Maps.
• Optional: install an app that measures angles.

Math requirements

• h = (tan(a) * d) + b
• Where
  • h = feature height
  • a = angle from bottom to top of feature
  • d = distance to feature
  • b = eyeball height
• Peruse the trigonometry section
• on this website

Web page requirements

• In order to get your map on your phone, you'll need to create a web page.
• Like this page

## Follow lesson section on Publishing maps to the web --- Example Markdown ```md # GEO409 Field Trip Maps Maps for field trip to measure tree canopy  Kentucky counties with selected land cover types – [Download geospatial PDF](Ky-landcover.pdf)  UKy central campus canopy model – [Download geospatial PDF](campus-canopy-model.pdf) Maps created by boydx for GEO409, Spring 2025, University of Kentucky Department of Geography ``` --- Need a map URL? ```md https://ionajo.github.io/geo409-field-trip/maps/campus-canopy-model.pdf ``` --- Check out these 2024 sites [Nick](https://nmooregray.github.io/geo409-field-trip/) [Hayden](https://haydenjhanc.github.io/GEO-409-MOD-4/) [Sam](https://sgla226.github.io/geo409-field-trip-maps/) [Delancey](https://delanceymorse.github.io/geo409-field-trip/) [Abby](https://abbymn.github.io/geo-409/) [Connor](https://github.com/rommimes/Geo409-Field-Trip) [Parker](https://schimpffafa.github.io/geo409-field-trip/) [Noah](https://github.com/N-Wormald/Trees-and-Landcover)