This section aims at preserving Christian Heritage site by detecting changes to them and their surroundings over time. To support this goal, the page draws on satellite imagery and atmospheric data, which together provide a detailed picture of both physical and environmental threats to these sites.

The satellite imagery used here comes in two main forms: FCI (False Color Imagery) and radar imagery.

FCI (False Color Imagery) refers to optical images that extend beyond the visible spectrum into the near-infrared band. By capturing wavelengths invisible to the human eye, false-color composites make it easier to distinguish between different types of land cover, vegetation, water, and man-made structures. This makes them particularly useful for identifying changes in the built environment over time.

Radar imagery, by contrast, is acquired by spaceborne radar systems (such as Synthetic Aperture Radar, or SAR). Unlike optical imagery, radar can penetrate cloud cover and operate independently of daylight, making it a reliable tool for monitoring sites under a wide range of conditions. Radar is especially sensitive to surface roughness and structural changes, which helps in detecting alterations to buildings and terrain.

The map integrates both current and past FCI and radar images, allowing for direct temporal comparison. The comparison layers highlight newly constructed structures in green and demolished structures in red, providing a clear visual representation of change over time. This makes it possible to identify destruction or significant infrastructure changes occurring in and around Christian Heritage sites.

In addition, the map incorporates atmospheric concentration data for nitrogen dioxide (NO₂) and ozone. These gases are included because both are known to contribute to the deterioration of building materials—NO₂ as a precursor to acid rain and ozone as a strong oxidant—making them relevant factors in assessing long-term damage to heritage structures.