ClueTrust KB

Why do my raster files show up upside down?

If you download imagery from sites on the internet for use in Cartographica, you may occasionally find that the data is either not georeferenced or contains the georeferencing information in a location or format that Cartographica cannot understand.  This often results in imagery not being placed correctly, or having an inappropriate orientation (it may appear upside-down or backwards).

Depending on the specifics of the problem, there are different solutions, but these problems are usually easily solved. 

In most cases, you will find that there is somewhere a corresponding "world" file extension ending with a "w" somewhere in the downloaded data (or nearby), which contains the georeferencing information for the image.   In the case of .tif files, the file has the same name and ends with .tfw, for .jpg, it should be .jpw, etc.

For example, if you download the miniscale_gb dataset from the Ordnance Survey in the UK, you will receive a folder named data that contains the MiniScale_(no_grid)_R12.tif, MiniScale_(with_grid)_R12.tif, etc. files and another folder within that folder named "georeferencing files".    The "georeferencing files" folder contains a folder named "TFW" which itself contains the files MiniScale_(no_grid)_R12.tfw, MiniScale_(with_grid)_R12.tfw, etc.

Once you have found the corresponding world file, place it in the same folder as the original image file and then open the image file with Cartographica.   Cartographica should then recognize the data and appropriately locate and orient it on the map.

If you do not have georeferencing information for a map, you will need to georefernce it yourself using the instructions in Cartographica's Help menu.

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