Find Your Plot on the Satellite Map from an Old Mouza Map

Land left by a father, a plot bought from abroad, an ancestral homestead you haven't seen in years: the papers are all there, but out in the field every rice paddy and ridge looks the same. The plot is clear on the Mouza map, yet matching that old drawing to today's roads and houses is hard.

The idea behind the fix is simple. Match a few places that appear on both the Mouza map and the satellite image, and the rest of the map's plots settle onto the satellite image in roughly the right place. "Roughly" is the word that matters most here, and this guide is open about why.

How it works: matching landmarks

On the Mouza map, pick a few places that still exist on the ground: road junctions, bridges, culverts, canal crossings, mouza boundary corners. These are your landmarks. Then show where each one is today, either by finding it on the satellite image or by standing on it and using your phone's GPS. Two matched landmarks are enough to place the map; a third and fourth give a check, showing how many metres each landmark is off.

Learned in the field: put landmarks near the plot

In the first field test, in a village in Chattogram, two landmarks were placed far from the plot. The plot near the landmarks landed in the right place, but plots further away drifted in distance and a little in angle. The fault wasn't the calculation; it was the hand-drawn sheet. So the advice changed:

• Mark three or four landmarks close to the plot, about 100 to 300 metres away.
• Put them on different sides. With every landmark on one side, the other side drifts.
• Choose things that don't move. Avoid riverbanks and pond edges; they shift over the years.

Step by step

1. Get the map's scale right first

The Mouza map you measured on needs the right scale, ideally checked against the chain scale bar. With the wrong scale, no amount of landmark matching will help.

2. Mark landmarks, at home if you like

Put the crosshair on a road junction, bridge or mouza corner on the Mouza map and mark it. You can do this before you ever go to the field.

3. Match each landmark

Zoom into the satellite image until the junction or bridge is clear and set it there, or go to the field, stand on the exact spot and match it with GPS. GPS matches are more reliable, and the phone shows how far away each landmark is.

4. See your plots and compare

Once two landmarks are matched, your measured plots appear on the satellite image. Tap one to compare its area on the Mouza map with its area as placed, and check whether it lines up with the fences and ridges you can see.

5. Adjust by hand if you need to

If a far plot is slightly off, shift or turn it until it sits on the fences you see. That helps you read the picture, but remember that the position now comes from your own judgement, not from the map.

Why Google Earth export needs GPS landmarks

Landmarks you place by tapping on the satellite image are fine for viewing inside the app. But Google's terms don't allow positions taken from its imagery to be carried out of the app. So a Google Earth file can only be made when every landmark was matched by GPS while standing on the spot, with no hand adjustment. Then the position is entirely your own measurement.

Mistakes to avoid

• Landmarks far away. Two junctions a kilometre off will let the plot drift. Use close landmarks, all around it.
• Places that have changed. Riverbanks, ponds and newly cut roads won't match an old map.
• The wrong scale. If the Mouza map's scale is wrong, the plots on the satellite map will be the wrong size too.
• Treating the result as the boundary. This helps you find the land. For placing boundary posts, possession or a dispute, the amin's measurement is final.

The short version

Three or four permanent landmarks close around the plot, on different sides, matched by GPS where you can: that is enough to find an old Mouza map's plot on today's satellite image, roughly. "Where is the land?" gets its first answer on your phone; the final answer comes from an amin and the land office.

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Frequently asked questions