Shall serve a dual purpose of positioning points to facilitate the survey of land parcels in difficult areas where it satisfies the accuracy standard set by the principle of graduated accuracy, consistent with land use, as may be specified by instructions, or provide graphical positioning of unavailable map detail for completion of the LIM. Detailed instructions on the procedures shall be issued by the LMB Director.

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Orthophoto maps provide geometrically corrected aerial imagery where distances on the image match true ground distances. This makes it possible to position survey points accurately in difficult areas and still meet the graduated accuracy standards tied to land use. At the same time, they supply graphical representations of map detail that may be unavailable in existing maps, enabling the LIM to be completed with up-to-date features. That dual capability—precise field positioning and filling in missing map detail—fits the stated purpose, with procedures to use them issued by the LMB Director. The other map types don’t offer this combination: a land information map is the end product, a projection map centers on coordinate systems, and a topographic map emphasizes terrain but not the precise, rectified positioning or filling of missing LIM details.