PGM maps with reference. Paid binding of general surveying plans (PGM). How fast is the binding

Several years ago, almost simultaneously with 3 layouts, even older ones appeared in the access - PGM cards. General surveying plans were mostly drawn up before 1800 and have a layout scale.

The usefulness of such a card in searching with a metal detector is 100% obvious, but ... I rarely open them, although there are all places where I dig. The first disappointment came when I could not tie them. Second, what can I see on them that is not on the 3rd layout? There are no fair tables (which is a pity).

It seems that there are old maps of high detail, on which even individual houses are indicated (in some places and sheds, cool!) ... But it is very difficult to get real practical use from them. Okay, it’s impossible to pinpoint coordinates exactly, but flaws come out even in the smallest details.

On the map of the PGM in the farm, 3 houses are indicated, at the point of detecting there are 5 of them. On the map they stand in a row, in reality there is a "chess" between them in 50 meters. And any inconsistency of such cards (and their summation) turns out to be empty time on the hunt.

Story 1

We found a farm on the PGM, which was not on the three-way layout ... And I know that the layouts have a very large error, and you should not rely on the coordinates. "Tied" to the hills that seem to have remained in place and were visible at the General Staff.

We arrived, wandered around for 3 hours with “crosses” trying to localize the house ... And they didn’t look for a brick, then such houses were wooden - they looked out for clay shards, “called out” horse meat, or even at least something from that time. Result 0.

There were several such attempts, and not only for me.

Story 2

We gathered for a plowed-up village. Based on the layout, they estimated the central estate, which was also called a stone house (at that time it was mega fat). It took 2 hours ... As a result, the real finds appeared only when we moved 200 meters from the originally planned point.

If we arrived and immediately set out on a wide reconnaissance (and did not stamp on the "exact" place), they would localize much faster.

Outcome

So it turned out that my main cards are. Accuracy is tolerable, detail is average. The most important thing is that I don’t waste so much time with them when localizing on the spot.

I specifically asked around my comrades - is there anyone real example how did the PGM map lead to the point of the cop? Moreover, such that the PGM is the only source of information, and without it these finds would not have been. So far we do not have such an example, although most of the PGM cards have))

P.S. Pay attention ➨ ➨ ➨ Bomb theme -. Look, you won't regret it.

On the network in the public domain there is great amount vintage cards. Most of which is plotted and therefore relatively easy to bind. These cards have been in circulation for a long time and almost all interesting places on them over the years, "knocked out" by search engines. But there is another type of maps that are bypassed: PGM (general surveying plans).

PGM characteristics:

Good scale (1-2 versts per inch)

Very detailed (all settlements, farms, roads and point objects)

The year of publication is usually from 1700 to 1820 - i.e. most monetarily interesting

Relatively little used by search engines due to the complexity of working with them

Binding the PGM is a difficult, very time-consuming task:

First, you need to accurately glue the card into one canvas. This is complicated by the fact that the number of fragments reaches fifty! In addition, cards are often glued to the canvas with a gap, which also requires preliminary gluing of the map sheets themselves, after which they are already glued into a huge canvas.

Color correction and contrast enhancement are performed. The cards are many years old, they are faded and poorly readable. We improve the quality of perception of information from maps.

PGM is not a classic map, but in fact - a drawing. There is no grid here to snap to, and errors in the image of objects can reach large quantities... And these errors must be minimized.

How do we link cards?

Professional software of surveyors is used. Landmarks from modern topographic maps and satellite images are taken as reference (reference) points. Then the map is "stretched" over these control points using triangulation, linear, affine or polynomial transformations (depending on the map). Several dozen points are used, the projection is selected. At the output, we get a file, straightened geometrically (in this case, it seems to be "spliced" so that the image more accurately corresponds to the terrain). We will convert this file to Ozf2 + map file format for you. Upon request, add kmz for Google Earth for free, rmp for Magellan Triton, jnx for new Garmins.

What is the binding accuracy?

The accuracy of the binding depends very much on the scale of your map, the year of compilation, the region (the farther from Moscow, the less accurate the maps are), edition and the degree of terrain change in a particular sheet. On average, the error in linking one-layout is less than 150 (usually 40-50) meters. For two versts PGM - 200-250 (usually 80-120) m. This does not mean that the entire map will have some kind of shift. On the contrary - most of the map will "fit" remarkably, but in some places there may be an error. On separate sheets far from civilization (Siberia, Russian north), the error may be higher.

How fast is the binding?

From day to week, depending on employment. When ordering, the deadline must be indicated. Please take into account the complexity of the work and order the binding in advance.

Sources of maps?

Most of the PGMs are freely available, some are in our private collection. You can also send your cards.

How to send cards?

As you wish. We can provide FTP, or upload to Yandex.Disk, for example, and send a link to the mail.

Example:

Cost and payment

The cost of binding one county - from 400 to 1500 rubles (depending on the complexity, the number of sheets and the need to glue them together). Payment is possible in electronic currencies, through express payment terminals or in another way convenient for you as agreed.