Geospatial raster · measured in your browser

Browse a 100-megapixel government COG.

Pan, zoom, inspect bands, and measure the exact range requests used for each viewport. The Kentucky aerial survey opens automatically.

Direct object storageWorker decodeBounded viewport readsNo API key

COG Range Lab

Aerial imagery and terrain

Pan the autoloaded Kentucky survey, switch to USGS elevation for Hillshade, or enter a CORS-enabled GeoTIFF URL.

Open another URLCOG or GeoTIFF

HTTPS GeoTIFF URL

Remote servers must allow CORS, byte-range GET requests, and a readable object size through Content-Range or Content-Length.

Choose a sourceDirect browser access

DatasetOverviewBandDisplay

CRS pendingOverview pendingViewport pendingAuto contrast pending

Raster Analysis

Analyze the active viewport.

Operations run on the current bounded region. Point values come from the cursor position.

Open a raster to see how each operation maps to its bands.

Open a raster, then choose an operation.

GeoZarr Cube Lab

Select dimensions before chunks.

The reader discovers declared metadata paths without listing a remote bucket. Time, band, vertical, and custom dimensions stay selectable.

Open another storeZarr v2 or v3

GeoZarr store root

Choose a storeDirect object-store access

DatasetLevelBandTimeVerticalDisplay

CRS pendingLevel pendingViewport pendingAuto contrast pending

Capability Matrix

Support generated from executable evidence.

Partial and unsupported states remain visible. Full claims and test references are available in geo-capabilities.json.

FormatAccessShapeGridModeEvidence

8 formats shown

Format	Local open	Remote open	Range access	Region read	Multiscale	Rotated affine	Pixel is area	Pixel is point	Unknown CRS	Bands	Time	Vertical	Nodata	Scale and offset	Target grid	Reprojection	Writer
GeoTIFF `purejsimage/geo/readers/geotiff`	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Unavailable	Metadata only	Tested	Metadata only	Tested	Tested	Out of scope
COG behavior `purejsimage/geo/readers/geotiff`	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Fixture-limited	Fixture-limited	Tested	Unavailable	Metadata only	Tested	Metadata only	Tested	Tested	Out of scope
GeoZarr `purejsimage/geo/readers/geozarr`	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Tested	Fixture-limited	Tested	Tested	Out of scope
Image plus world file `purejsimage/geo/readers/world-file`	Tested	Tested	Fixture-limited	Fixture-limited	Unavailable	Tested	Tested	Unavailable	Tested	Fixture-limited	Unavailable	Unavailable	Unavailable	Unavailable	Tested	Tested	Out of scope
ENVI `purejsimage/geo/readers/envi`	Tested	Fixture-limited	Tested	Tested	Unavailable	Unsupported	Tested	Unavailable	Tested	Tested	Unavailable	Unavailable	Tested	Tested	Tested	Tested	Out of scope
Esri ASCII Grid `purejsimage/geo/readers/esri-ascii-grid`	Tested	Fixture-limited	Unsupported	Fixture-limited	Unavailable	Unavailable	Tested	Tested	Tested	Unavailable	Unavailable	Metadata only	Tested	Unavailable	Tested	Fixture-limited	Out of scope
SRTM HGT `purejsimage/geo/readers/srtm-hgt`	Tested	Fixture-limited	Tested	Tested	Unavailable	Unavailable	Unavailable	Tested	Unavailable	Unavailable	Unavailable	Metadata only	Tested	Unavailable	Tested	Tested	Out of scope
Classic NetCDF / CF `purejsimage/geo/readers/netcdf`	Tested	Tested	Tested	Tested	Unavailable	Unsupported	Unavailable	Tested	Tested	Fixture-limited	Tested	Tested	Tested	Tested	Tested	Fixture-limited	Out of scope

Package boundaries

Safe defaults remain visible.

URLs and metadata render as untrusted text.
Cancellation reaches range reads, chunk reads, decoding, and analysis.
Cross-CRS reprojection requires a caller-supplied transform provider.
CORS, Range, codec, metadata, grid, and CRS errors keep their original diagnostic.
Required browser tests use deterministic local servers. Public sources remain opt-in smoke tests.

Build it with PureJsImage

Read the active viewport with public APIs.

This TypeScript follows the source, overview, dimensions, bands, and viewport selected above. Switch between the COG and GeoZarr labs to see the imports and bounded read update.

geo-viewport.ts · current selection