Abstract

This high-fidelity mockup presents an interactive web map of the allotment gardens (Kleingärten) located in the Berlin district of Marzahn-Hellersdorf. The spatial data has been retrieved via public WFS services provided by the Berlin Geoportal and processed using sf, ows4R, and tmap in R. The application aims to provide both a visually appealing and data-rich representation of the spatial distribution, attributes, and administrative affiliations of allotment gardens in the assigned district.

The map includes customized styling and interactive pop-ups for each garden parcel. It allows users to explore individual features.

Objective

The main objective of this mockup is to visualize the spatial distribution and selected attributes of allotment gardens in Marzahn-Hellersdorf using a fully interactive and aesthetically refined map interface.

Data Sources

Two datasets were accessed using WFS (Web Feature Service) from the Berlin Geoportal:

Both datasets were retrieved in GML2 format and projected in ETRS89 / UTM Zone 33N (EPSG:25833).

Methodology

The datasets were imported and preprocessed using the sf and ows4R libraries. Spatial filtering was applied to extract only those features that are fully contained within the Marzahn-Hellersdorf district. Overlapping gardens were excluded from the final visualization based on administrative ownership.

Column names were standardized, and attribute values were recoded to improve readability.

Final Visualization, Map Design and Interaction

Key design features include:

The allotment gardens are displayed in red and the district border is displayed in orange. The allotment gardens are displayed with a fill color of red and a border color of black.