refactor: switch API access

now using R bindings from eneller/openSkies instead of raw REST access

.gitignore

@@ -61,3 +61,5 @@ rsconnect/
 *.pdf
 *.html
 bib
+
+.env

README.md

@@ -29,3 +29,5 @@ Use [renv](https://rstudio.github.io/renv/articles/renv.html) to install the cor
 ``` r
 renv::restore()
 ```
+
+[OpenSky](https://opensky-network.org) access also requires credentials placed in a `.env` file, for which an example is provided in `.env.example`.

main.Rmd

@@ -1,15 +0,0 @@
----
-title: "Topic 8"
-output: html_document
-date: "`r Sys.Date()`"
----
-
-```{r setup, include=FALSE}
-knitr::opts_chunk$set(echo = TRUE)
-```
-
-# Download data
-from OpenSky https://opensky-network.org/datasets/states/#flights/
-```{r download}
-library(openSkies)
-```

src/.env.example

@@ -0,0 +1,2 @@
+OPENSKY_CLIENT_ID=changeme
+OPENSKY_CLIENT_SECRET=changeme

src/main.Rmd

@@ -0,0 +1,66 @@
+---
+title: "Topic 8"
+output:
+  pdf_document: default
+  html_document: default
+date: "`r Sys.Date()`"
+---
+
+```{r setup, include=FALSE}
+knitr::opts_chunk$set(echo = TRUE)
+```
+
+```{r preamble, message=FALSE}
+# Load Libraries
+library(dplyr)
+library(lubridate)
+library(readr)
+library(utils)
+library(openSkies)
+library(dotenv)
+library(httr)
+library(jsonlite)
+library(trajr)
+```
+
+# Download flights 
+```{r opensky}
+
+time_now <- Sys.time()
+creds <- getCredentials(
+  client_id = Sys.getenv('OPENSKY_CLIENT_ID'),
+  client_secret = Sys.getenv('OPENSKY_CLIENT_SECRET'))
+
+# get departures from Frankfurt airport
+departures <- getAirportDepartures(airport = "EDDF", startTime = time_now - hours(1), endTime = time_now, credentials = creds )
+
+getFlights <- function(icao, time, creds){
+  flights <-getAircraftFlights(icao, startTime =  time - days(1), endTime = time, credentials = creds )
+  return(flights)
+}
+icao <- departures[[1]][["ICAO24"]]
+flights <- getFlights(icao,Sys.time(), creds)
+# TODO map from all available flights to tracks
+query <- list(icao24= icao, time=as.numeric(flights[[1]][["departure_time"]]))
+
+response <-makeAuthenticatedRequest('tracks/all',query, creds)
+track_data <- fromJSON(content(response, as = "text", encoding = "UTF-8"))
+if (!is.null(track_data$path) && length(track_data$path) > 0) {
+    
+    route_df <- as.data.frame(track_data$path)
+    colnames(route_df) <- c("time", "lat", "lon", "alt", "heading", "on_ground")
+    
+    message("Loading of route successfull! Points: ", nrow(route_df))
+    
+    plot(route_df$lon, route_df$lat, type="o", pch=20, col="blue", 
+         main=paste("Geographic route of", icao),
+         xlab="Longitude", ylab="Latitude")
+    
+    plot(route_df$time, route_df$alt, type="l", col="red", lwd=2,
+         main=paste("Altitude profile of", icao),
+         xlab="Time (Unix)", ylab="Height (Meter)")
+    
+  } else {
+    print("No path points from api")
+  }
+```

src/slides.Rmd

@@ -0,0 +1,33 @@
+---
+title: "Topic 8"
+date: "`r Sys.Date()`"
+output: beamer_presentation
+---
+
+```{r setup, include=FALSE}
+knitr::opts_chunk$set(echo = FALSE)
+# {cat, child="../README.md"}
+```
+
+## Task
+Develop an R-based software, which will perform the following tasks:
+
+1.  download from the OpenSky Network online database the observations of the trajectory of a randomly selected aircraft on a randomly selected flight over at least five days, in uninterrupted continuity (1)
+
+2.  perform the selections in the graphical user interface (GUI) of your R script,
+
+3.  determine the characteristics of each trajectory according to the parameters: diffusion distance, straightness, duration of travel, mean travel velocity and fractal dimension (2),
+
+4.  using the R library trajr, (4) perform basic statistical analysis of the parameters of daily trajectories from (3): arithmetic mean, variance, quartiles, boxplot, estimate of the density function of the experimental statistical distribution, analyze and interpret them.
+
+
+## Methodology
+
+1. acquire data using the OpenSky API
+
+2. use 
+
+## Contribution
+
+- extended functionality of the `openSkies` R package and created a merge request
+