Starts a local 'shiny' app with a 'leaflet' map: switch between a roam mode
(free pan/zoom, no drawing) and a draw mode with a button, then click twice
on the map in draw mode to frame your region of interest as a rectangle;
pick a verified product variant and date range, preview the file manifest,
then batch-download with glass_fetch() in one click.
Usage
glass_app(port = getOption("shiny.port"))Arguments
- port
Port for the shiny server (see
shiny::runApp()).
Details
The app is thin: everything happens through the package functions, so the
same workflow is available non-interactively via glass_fetch().
The download directory can be picked with the built-in, in-page directory
browser (package 'shinyFiles'; no native modal, works in RStudio's Viewer
pane and in any browser); without 'shinyFiles' the path can simply be
typed in. A progress bar tracks each file during the batch download.
After a download, the map-header controls overlay a downsampled preview of the downloaded granules (fill/scale from the registry, multi-tile mosaics, cropped to the ROI and reprojected to EPSG:4326). Previously downloaded data can be brought in without re-downloading with the "Scan Import" button, which opens the same directory browser and recognizes GLASS granules by naming/code; the preview shows the first SDS layer of multi-band products. Requires 'shiny' and 'leaflet' (Suggested dependencies) to be installed. Base maps default to an unbiased Esri World Imagery layer; an Amap street layer is optional but uses GCJ-02 coordinates, so it is offset by roughly 500 meters from WGS84.