How to increase the accuracy of geolocation?

Question

satellite navigation

Good evening.
My question is confusing, I only guess about the solution.
The task is the following.
There is, for example, a holiday village. You need to take photos of buildings and put an array of points on the map. There are no particular problems with this stage, I extract the coordinates from exif photos and transfer them to yandex maps. Everything seems to be fine, with one exception, the accuracy of the coordinates leaves much to be desired. The building may be on a neighboring site or in general, on the median strip of the route.
For this purpose, the customer purchased this miracle of bourgeois technology , he hopes that this will give an acceptable result in gps photo data.
I think that the reason is precisely this, that the gps module of the device under no circumstances will give the required accuracy.
Tell me how to solve this problem, how to get a satisfactory accuracy of coordinates, within a few meters? What device can take accurate coordinate data?

Answer 1

If you don’t want to mess with a soldering iron, you can take such a device for example . Allows you to save raw data of phase measurements, which makes it possible to post-process measurements. You really need a base station, but if you are not in a remote village, this should not be a problem. At worst, you can buy a second devay and use it as a base. With an accuracy of 5m, you can generally walk straight with him without worrying. At 1-2m, you will still need to stand for 10-15 minutes.

Answer 2

https://ru.aliexpress.com/item/VK2828U7G5LF-Replac...