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Launch Interactive Fetch App with File Upload

Source: R/shiny_app.R
fetch_app_upload.Rd

Launch a standalone Shiny app where users can upload a CSV file with GPS coordinates, and the app will automatically download lake boundaries, calculate fetch, and display interactive results.

Usage

fetch_app_upload(title = "Lake Fetch Calculator")

Arguments

title

Optional app title (default: "Lake Fetch Calculator")

Value

Launches a Shiny app (does not return)

Details

Requires the shiny, leaflet, and base64enc packages (suggested dependencies).

The app workflow:

  1. Upload a CSV file with latitude/longitude columns

  2. App downloads lake boundaries from OpenStreetMap

  3. Calculates fetch for all uploaded points

  4. Displays interactive map with results

  5. Click anywhere on a lake to analyze additional points

  6. Download results as CSV or GeoPackage

CSV file requirements:

  • Must have columns starting with "lat" and "lon" (case-insensitive)

  • Optional "Site" column for point names

  • Additional columns are preserved in output

Examples

if (interactive()) {
  # Launch the upload app
  fetch_app_upload()
}