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.
Ground Control Point File Converter
Move ground control points between Pix4D, Agisoft Metashape, Emlid and OpenDroneMap. Small files, and every drone surveyor hits this the first time they change software.
Drop a ground control point file here
Read on your device · nothing is uploaded
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.
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 flight logs work?
Any CSV export: Airdata, PhantomHelp, Litchi, DJI Flight Record converters and the rest. The columns are found by name, so the order does not matter. The .txt files the DJI app writes are an encrypted binary format and cannot be read in a browser — run them through a log service first and bring the CSV here.
Which ground control point formats?
Pix4D, Agisoft Metashape, Emlid and OpenDroneMap, read and written. The reader works out which layout it is looking at from the columns rather than being told, including the projection line an OpenDroneMap file starts with.
Does the GCP converter reproject?
No. It converts the layout, not the coordinate system — the numbers pass through unchanged. If the two packages expect different systems, reproject first with the coordinate converter here, then convert the layout.
How can a huge GeoTIFF report instantly?
A TIFF keeps its metadata in a directory that is a few kilobytes long. The tool reads the first sixteen bytes to find where that directory sits, then reads only that part. A two gigabyte orthophoto is answered from about half a megabyte, and no pixels are decoded.
My GeoTIFF says it has no coordinate system.
Then it genuinely carries none. That is common with images exported from photo software rather than GIS. Look for a .tfw or .prj file beside it, which holds the georeferencing separately.
Is anything uploaded?
No, and it matters more here than anywhere else on the site. A survey deliverable under contract never leaves your machine.
Other coordinate tools
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GCP Converter
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Compare Two Layers
Attribute Editor
File Inspector
Simplify a Layer
Buffer
Clip and Difference
Dissolve
Spatial Join
Area and Perimeter
Geometry Info
UTM to Latitude Longitude
DMS to Decimal Degrees
Everest / Kalianpur to WGS 84
GeoJSON Validator
Coordinate Converter