MapZoomer Crisis Viewer is an interactive web application built for the purpose of "Rapid Situational Awareness" in the field during large-scale disasters.
In this operational prototype, using data from the Nepal Large-Scale Flood (Bhoto Koshi-Trishuli Flood) as a case study, we seamlessly integrate three axes on a single screen:
- Critical Location List (Spatial Axis)
- Disaster Timeline (Field Time Axis)
- Satellite Imagery Timeline (Data Acquisition Time Axis)
We have implemented an interface that allows intuitive Before/After comparison analysis of satellite images before and after the disaster using a slider.
- Multi-Sync of Spatial and Temporal Axes
When you select a disaster-affected location (e.g., Timure) in the left panel, the map center shifts and automatically focuses on the corresponding time on the "Disaster Timeline." Space and time are instantly synchronized. - Before / After Comparison Slider
Smooth comparison of satellite imagery before the disaster (2026-05-27) and after the disaster (2026-08-27). - 3D Terrain Analysis Mode
Switch to 3D terrain display (3D View) with a single button. Enables high-level understanding of landslide and river channel blockage expansion in steep mountainous terrain. - Bilingual Support (Multi-language Support)
Switch between Japanese UI and English UI with a single tap using the toggle button in the upper right.
- Frontend: MapLibre GL JS / TypeScript / HTML5 / CSS3
- Map Data & GIS: COG (Cloud Optimized GeoTIFF) / Vector Tiles / 3D Terrain Tiles
- Data Pipelines: STAC API / GDAL / OpenStreetMap
Individual Developer (Japanese solo developer)
Based on 30 years of experience in international news reporting, I built this application as an individual developer. Although I have been formally developing web applications and GIS for about a year, I am materializing the strong challenge I felt in the news field: "In a disaster situation where every second counts, I want to understand the situation in the field correctly and quickly."
- Geopera reconstruction: Rapid scientific reconstruction of the triggering mechanism, timeline, satellite comparison and estimates.
- Planet Crisis Response / Source Cooperative: STAC catalog for PlanetScope, SkySat and Pelican imagery (CC BY-NC 4.0).
- Copernicus EMSR927: Emergency mapping of flood extent and damage assessment.
- Reuters · Barrier lake monitoring & Verified location: Two barrier lakes, reported surface areas, natural drainage and verified coordinates for Barrier Lake A.
- OpenStreetMap contributors / ODbL
※This tool is not an official damage assessment or evacuation order. Please confirm announcements from local governments and public agencies.
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