Abstract: The article studies GIS and geoportal adaptation of multi-sheet plans of mid 19th century territories. The authors have revealed a layer of complexes of multi-sheet large-scale cartographical works of the mid 19th century presented in the form of territory plans on certain locations. One complex of 65 sheets belongs to Vetluzhskiy Uezd of Kostromskaya Guberniya. Other guberniyas can also boast such complexes. The plans demonstrate the boarders of landownings, populated regions and areas. To create various raster electronic maps the authors have suggested to use a method based on the evaluation of parameters of the sheet grid followed by virtual combining of plan sheets and formation of the agreed complex of raster electronic maps with preset parameters. They suggest to use raster electronic maps for geocoding the list of populated territories. The main conclusion is the possibility to use this approach for creating databases with raster electronic maps covering multi-sheet complexes of mid 19th century territory plans which can be further employed in GIS or geoportals when computerizing historical studies. The creation of such databases will add existing information resources covering large-scale topographic boundary maps of 8 guberniyas made by A.I. Mende and military topographic maps thus expanding research opportunities.