Unity has a vertical field of view.
So let's supose that for Screen Height is 1080, the scale should be equal to 1.
When starting the application and resizing the screen, set scale = 1080 / New Screen Height.

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I do not need your working project.
I need ANY scene where I can check it out.

Each zoom has a different scale. I need the object on which the "Canvas" with the "World Space" mode, on any zoom, be of such a scale that it is exactly the same size as the object, but is in the Canvas hierarchy.
In NGUI, this is done using the ScreenHeight / ScreenWidth coefficient. But the map also takes into account "Distance a camera".

Help!)

There are objects on the map. When the object is beyond the boundaries of sight of the camera, it is attached to the edge of the screen, passing in the Canvas UI.
The picture shows that the objects that are visible to the camera are markers on the map and their scale is ~2 times larger than it should be.
This screenshot is made at a distance of the camera = 1000, with a screen resolution of 720 x 1480

Why should it be -40?
This can be any value that the marker occupies on the screen when scale = 1.
If you move the camera very close to the map, it will show you very big value.

What's wrong?

        public void CalculateScaleByResolution() {
            if (OnlineMaps.instance == null) {
                return;
            }
            float lon = 38;
            float lat = 45;
            int zoom = OnlineMaps.instance.zoom;
            OnlineMaps.instance.projection.CoordinatesToTile(lon, lat, zoom, out double tx, out double ty);
            float markerHeight = JourneyObject.instance.sizeElement;
            double ty2 = ty - markerHeight / 256;

            OnlineMaps.instance.projection.TileToCoordinates(tx, ty2, zoom, out double lon2, out double lat2);

            var res1 = OnlineMapsControlBase.instance.GetScreenPosition(new Vector2(lon, lat));
            var res2 = OnlineMapsControlBase.instance.GetScreenPosition(new Vector2((float)lon2, (float)lat2));

            Debug.Log("res1 = " + res1);
            Debug.Log("res2 = " + res2);

            res1 -= res2;
            Debug.Log("res3 = " + res1);

            var val = markerHeight / res1.y;
            Debug.Log("val = " + val);
        }

2. Subtract from Tile Y the height of the marker texture in pixels divided by 256.
double ty2 = ty - markerHeight / 256.

3. Convert the new tile position to geographical coordinates.
OnlineMaps.instance.projection.TileToCoordinates

4. Convert the original and new coordinates to the screen positions.
OnlineMapsControlBase.GetScreenPosition
http://infinity-code.com/doxygen/online … b35214c35b

5. Subtract the second screen position from the first screen position to calculate the screen height of the marker when scale = 1.

6. Use this value to calculate the required scale.