Abstract: Manual, semi-automated or automated image-based electronic manifests of locate operations. Multiple image layers may be selectively enabled or disabled for display to facilitate comparative viewing of different base images and/or categories of information overlaid on the base image(s) relating to the locate operation. Accuracy indicators and/or calibration factors may be employed to ensure geographic integrity and appropriate registration of displayed information. In one example, revision layers are employed so that “raw” data, modified data, and/or annotated images may be maintained and locked to prevent unauthorized modifications. Limited access files also may be employed to prevent unauthorized edits to or use of manifests. If a digital base image is not available or of poor quality, base images may be sketched manually (e.g.