InteractiveGeo

• InteractiveGeo is a Julia package, built primarily on top of GLMakie and Rasters, for interactively visualizing and annotating raster data.

Usage

using Rasters, InteractiveGeo, RasterDataSources

# Load a Raster
files = getraster(WorldClim{Climate}, :wind; month=1:12)
r = Raster(files[1])

# Create an Interactive Map of the Raster
# The returned `features` object is an `Observable` that is populated based
# on features (polygons) drawn on the map.
features = draw_features(r)

# You can now add Markdown annotations to the polygon features
features[]["polygon_label"] = md"My notes"

# Finally, you can save features as GeoJSON
str = geojson(features[])  # String representation of the GeoJSON
write("features.geojson", str)  # Save the GeoJSON to a file

Graphical User Interface

The above GUI is launched via the draw_features function. The left panel contains the UI, and the right panel contains the map/raster.

Going top down, the UI contains the following components:

Display Settings

• Aggregate Function and Aggregate Scale. To avoid visualizing every pixel of a large raster, InteractiveGeospatial will aggregate the raster data into a smaller number of bins. These two inputs are passed to the Rasters.aggregate function.
• Remap Function. This function is applied to the raster data before visualization. For example, you can apply a logarithmic transformation to the data.
• Colormap. The color map used to visualize the raster data.

Draw Polygon

• Color. The color of the polygon and text displayed over the image.
• Clear Current Drawing. Clear the current drawing.
• Label (Unique Identifier). Polygons must be labeled with a unique name before they can be saved.
• Save to Return Value. Save the polygon to the returned Observable from the draw_features function.
• View Drawing. Display a previously-saved polygon over the image.