A method for gap filling geographic information service data includes determining a bounding region at or near an initial alignment. The method also includes determining the initial alignment within the bounding region. A corridor buffer is generated at or near the initial alignment, and within the bounding region. Cost layer data is processed. Incompleteness of a number of polygon-bounded areas is determined based on the cost layer data. Partial completeness of the polygon-bounded areas and completeness of the polygon-bounded areas are also determined based on the cost layer data. A synthetic completeness of the number of polygon-bounded areas is generated based on the incompleteness, the partial completeness, synthetic completeness, and completeness of the polygon-based areas. A rasterized cost map including the completeness and the synthetic completeness of the polygon-bounded areas is stored at the processor(s) and in memory (ies).