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Turn any map image into a Ditch Assist map layer.

Drop in a screenshot of a cut/fill map, elevation map, drainage design, or drone photo. Position it on real satellite imagery below, then download the matching image + world file pair Ditch Assist uses to load it in the right spot — runs entirely in your browser, nothing is uploaded. Got a GeoTIFF? It converts to JPG and drops into place automatically.

Ditch Assist™ is a free RTK GPS grade-control app for drainage and earthworks — this tool prepares map layers for it. See what Ditch Assist is →

How it works

Four steps, no upload.

1

Load your image

Drop in a JPG or PNG screenshot of the map, design, or photo you want to reference — or a GeoTIFF, which converts to JPG automatically.

2

Find the field

Search a location or pan and zoom the satellite map to the right spot.

3

Line it up

Drag the corner handles or the image itself until it matches the ground below it.

4

Download and use it

Download the image and world file together — they come out with matching names — then load both into Ditch Assist™ as a custom map layer.

FAQ

Image georeferencer questions.

World filesWhat is a world file, and why do I need one?

A world file (.jgw for JPG, .pgw for PNG) is a small text sidecar file that tells mapping software exactly where an image sits on the earth — its corner coordinates and pixel size. Keep it in the same folder as the image, with the same file name — this tool downloads both together with matching names — and Ditch Assist can load the image as a map layer in the correct real-world position.

Image typesWhat kind of image should I upload?

Any screenshot or exported image you want to see as a reference layer on top of the field map — a cut/fill map, an elevation map, a drainage design, a drone photo, or an old survey drawing. JPG and PNG load as-is; a TIFF or GeoTIFF is converted to JPG in your browser, and a GeoTIFF with embedded location data is placed on the map automatically.

AccuracyHow accurate does the placement need to be?

As accurate as you can get it visually against the satellite imagery. Drag the corner handles or the whole image, or type exact coordinates in the North/South/East/West fields for precise placement. There is no rotation support — align images that are already roughly north-up.

PrivacyDoes anything get uploaded anywhere?

No. Your image is read directly in the browser and never leaves your device. The only network requests are for satellite map tiles and, if you use the search box, an optional location lookup.