[Bug] Incorrect SvgSelector for Los Angeles 1949 Vol. 14 p1404

[danvk]

Describe the problem

Los Angeles 1949 Vol. 14 p1404 is (correctly) split into two regions, each of which is georeferenced. The OIM UI displays this all correctly.

When you download the IIIF Georef AnnotationPage
from https://oldinsurancemaps.net/map/sanborn00656_064, however, you see the following two SvgSelectors:

[
  {
    "id": "https://oldinsurancemaps.net/iiif/resource/57212/",
    "type": "Annotation",
    "label": "Los Angeles, Calif. | 1949 | Vol. 14 p1404 [1]",
    "target": {
      "selector": {
        "type": "SvgSelector",
        "value": "<svg><polygon points=\"393.61413608172074,289.82282644404813 481.28987042021373,2607.940217953901 408.41955415218314,4392.218380697355 421.1152234035842,7877.548625059436 2885.4820089594878,7943.460655219209 2966.0059586676152,4234.703219082494 2914.371448366465,238.08853508922607 393.61413608172074,289.82282644404813\" /></svg>"
      }
    }
  },
  {
    "id": "https://oldinsurancemaps.net/iiif/resource/57213/",
    "type": "Annotation",
    "label": "Los Angeles, Calif. | 1949 | Vol. 14 p1404 [2]",
    "target": {
      "selector": {
        "type": "SvgSelector",
        "value": "<svg><polygon points=\"261.75655261841166,379.9985145092728 243.8044723739631,7970.013894542539 2175.473540617598,7961.684690188122 2252.405192793288,4196.569775239307 2185.532399644916,325.8846970850252 261.75655261841166,379.9985145092728\" /></svg>"
      }
    }
  }
]

Here's what those SvgSelectors look like on the original image:

Expected behavior

One SvgSelector should select part of the left region of the image, and the other should select part of the right region of the image. (The GCPs are all correct, it's just the SvgSelector that has a problem.)

To Reproduce

Unclear, I'm just looking at the finished product with the bug.

Environment info:

n/a

Additional context

n/a

[mradamcox]

Interesting, I believe this is the same issue I remember seeing a while ago with one or two of the San Francisco volumes, though I never looked deeper into it. Thanks for making this ticket. Ultimately, the SVG selector coordinates get retroactively transformed during the generation of the IIIF annotation, so this must be an edge case due to these particular types of splits, where a page is split directly in half. Will need further investigation.