What you will need
- QGIS - an open source gis program you can download it here
- Your imagery or your map that is already georefrenced
In this example we will take a tiff file download from aerial imagery processed using mapsmadeeasy. But you can use any georeferenced file. You can even style your own maps.
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Steps
1. Download your file
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2. Bring it into QGIS
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3. Re-project it to web mercator (3857)
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4. Tile it using QGIS tools
5. Zip it up