Coding rabbits are looking for a treasure

Part one. Google earth in the fog

The weather this weekend was favorable, so the Team of Coding Rabbits , consisting of rabbitone and restorer , armed with a metal detector, decided to get out into the zone behind the swag. I didn’t want to go far, so we started searching for nearby anomalies.



Under the cut text and a half megabytes of pictures.



A field across the road from the office is quite suitable for searches, if it were not for tall grass and builders who decided to fence off half of the field with a fence. Let's see on the map.

The newest paper card available is 2003.


In Google Earth, almost the entire city is foggy, but you can view individual roads. We will use it to bind scanned cards. We are interested in maps of scales 1: 50,000, 1: 25,000, and so on. three-versts (3 versts in an inch).



1982 map - showing several buildings and a water tower. Later we found out from local residents that in Soviet times there was a farm on the field.



Polish map of the Military Geographical Institute - they were issued between 1919 and 1939. The map shows a separate courtyard.



Military topographic map of the provinces of 1856-61, three-layout. Letter F - Folvarok (manor). I do not have a full sheet, but on the site of the Wanderer I found a fragment posted for free .



Overlay maps on top of each other using tags in Google Earth. Snapping is carried out by eye on landmarks that do not change position (churches, cemeteries, geographical benchmarks).



After the overlay, the estate is over the farm - either because of inaccuracies in the map and overlay, or it really was.

I give an idea for a startup: mapping service with an archive of maps and temporal of the second frame to move to the old maps. Earn by downloading maps and GPS anchor points. Eeeh, a dream!

Part two. In field.

For searches we need:

• Metal detector (do not call it a mine detector - it detects not only mines, but not the device, but the head is looking for :) - Fisher F-4, a good model of last year.
• Shovel - without it in any way.
• Bottle of water - wash the finds from dirt.

When we went out into the field, we saw that it was all overgrown with half-rotted rapeseed, which we did not manage to remove. Near the construction site, the grader workers shifted a few centimeters of land - just as much as needed to remove the rape and leave future finds.




The device operates in two modes - dynamic and static (pin-point). In dynamic mode, you need to move the coil relative to the metal, in pin-point mode (like an inspection metal detector) - you can simply bring the coil to the metal, but the discriminator does not work (ferrous and non-ferrous metals are not distinguished).

The first signal. The figure shows the relative electrical conductivity of the metal. This conductivity corresponds to a copper object the size of a coin (arrow on the scale above). Depth - clear - 2..4 inches, which means the item found is really colored - rust and iron oxides give a similar, but smeared in depth signal.



Digging?



Read the sequel on Friday.

• We examine the zone
• First finds
• Clean and value
• A bit of history

Moved to a hobby .