See the Ground in Three Dimensions

Satellite imagery draped over real elevation, drawn in your browser. Pick a valley in the Sahyadris or the Himalaya, turn it, come down into it. A contour map tells you the slope is there; this shows you what it is.

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The heights are real; the exaggeration is not. Elevation is SRTM and national survey data from the Mapzen and AWS open archive — the same heights every GIS uses — at about thirty metres between samples where the coverage is best. The imagery is ordinary satellite tiles. The only invented figure is the vertical scale, which starts at 1.6× because a real valley at true scale looks flatter than people expect, and every 3D map you have seen was quietly doing the same. Slide it to 1 for the ground as it is. At thirty-metre spacing a gully narrower than that is not in the data at all, so this shows the shape of a landscape rather than the detail of a slope.

Drawn with MapLibre GL, which is open source under a BSD licence and is the engine most of this industry uses for terrain.

Why this matters here

Older Indian survey and revenue records sit on the Everest spheroid, not WGS 84. Treating one as the other puts everything a few hundred metres out — enough to move a plot boundary onto a neighbour.

Indian systems included

Kalianpur 1880, 1937 and 1975, the India zone grids, UTM zones 42N to 47N on both WGS 84 and Indian datums, and the WGS 84 state systems.

Bulk paste

Paste a column straight out of a spreadsheet. Anything after the first two values is carried through as a label, and the result downloads as CSV.

Nothing leaves your device

The arithmetic runs in your browser with proj4. No coordinate is transmitted, logged or stored anywhere.

Frequently asked questions

Which coordinate systems are supported?

WGS 84 and Web Mercator, UTM zones 42N to 47N on both WGS 84 and Indian datums, the Kalianpur India zone grids, and the WGS 84 state systems including Maharashtra. Each is listed with its EPSG code so you can check it against your source.

How accurate is the datum shift?

Transformations use the standard seven-parameter shifts published for each datum. Between Everest-based Indian datums and WGS 84 the difference is a few hundred metres, so using the wrong one is immediately obvious on the map preview.

Can I convert a whole list at once?

Yes. Switch to the bulk tab and paste a column. Comma, tab, semicolon or space separated all work, and anything after the first two values is kept as a label. Download the result as CSV.

Which value goes in which box?

Easting or longitude on the left, northing or latitude on the right. The labels change with the system you pick, so you never have to remember. Bulk mode has a swap option.

Is anything uploaded?

No. Everything runs in your browser using proj4, so no coordinate ever leaves your device.

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