Orthomorphic is a classical British term. OziExplorer does not support this projection but mathematically it is synonymous with the Lambert Conformal Conic, which is supported. On the border of the maps we find information of the projection used: When searching the internet I discovered that I had to understand where I was searching for.Ī map projection is a means of projecting the spherical earth onto a flat plane. The projection and the datum for this mapserie are both not supported by OziExplorer. To do this calibration you need data about the projection and the datum of the map. With the freeware program Irfanview you can open these files and save in another format.Ī digital map is an image which has been georeferenced (calibrated) so OziExplorer can use any pixel position on the map to determine the true geographic position.
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You can download them in Jpeg2000 format, because this is not a widely supported format you have to convert them to a more common format. These maps are made by the US Army Map Service during World War II. In the Map Collection section of the Library of Congress I found a nice serie of Dutch 1:25000 topographic maps, called M831. Searching the internet, testing and help from experts (Louisiana State University, University of Twente, Kadaster Netherlands and the OziExplorer user forum) was needed, in this blog I publish my findings toĢ: Calculate missing datum shift parameters. Using historical maps in OziExplorer can be a challenge because of the many standards used in the world of cartography software.