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Interpretation Strategies Image interpretation can involve different levels of complexity, for example, the recognition of a road or rail system would be easy to spot for an interpreter with some experience of the vertical perspective. A disused railways line could however be a little more difficult to interpret. However, often it is necessary to infer the existence of an object based upon characteristics of the feature's appearance on the image. A good example of this would be a buried gas pipeline. The actual pipeline cannot be seen but there are often changes to the ground surface caused by burial, which are visible on aerial images. Here for example soils could be better drained due to the sand and gravel used in backfill and a buried pipeline can be inferred by a lighter-toned linear streak across the image. This buried oil pipeline in Bemidji, Minnesota, USA is an obvious example.
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