COG Viewer & Analyzer
On-demand loading — only downloads what you need
1 · Data
2 · Terrain
1
Add Data
Paste a COG URL or drop a local .tif anywhere.
COG File URL
Load Header
or try:
Sentinel-2 RGB (Tokyo)
Sentinel-2 NIR (Tokyo)
DEM 10 m (Grand Canyon)
DEM (Mt. Fuji)
▶ Inspect (IFDs / tags / GeoKeys)
2
Select & Fetch
Draw a box on the area you want, then fetch the data.
Draw Box
Full Extent
Clear
No region selected
Output Resolution
128 × 128 — fast preview
256 × 256 — balanced
512 × 512 — detailed
1024 × 1024 — high detail
Render
Single band
RGB compose
Band
R · G · B
Palette
Stretch
auto (min/max)
percentile 2-98
manual
Fetch & Render
3
Analyze
Run statistics on the fetched data.
Analyze Region
Pixel Value (hover)
Hover over rendered area
Copy as Python
rasterio
rioxarray
Copy
Paste into a Jupyter cell. Reproduces the same overview level + window the viewer used.
1
Simulation Grid
Resample the selected region onto a grid with square cells.
Grid
256 — fast
512 — balanced
1024 — detailed
No grid built
Build Grid
2
Terrain
Hillshade, slope and aspect from the elevation grid.
Sun az
315°
Sun alt
45°
Z factor
1×
Compute Terrain
Overlay
Hillshade
Slope
Aspect
None
Opacity
85%
Computed on a resampled overview grid, not full resolution. Derivatives use Horn's 3×3 method; NoData cells act as walls.
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