Convert GeoPDF to GeoTiff
GeoPDF maps are typically produced by US government agencies. While not directly usable with Potlatch or JOSM, they can be converted into GeoTiff images. GeoTiff images can be used as a layer in JOSM. GDAL must be installed on your computer. Binaries are available for Linux, Mac and PC.
The command line for converting a GeoPDF to a GeoTiff is:
gdal_translate -of GTiff -co "TILED=YES" -co "TFW=YES" NOCAmap1.pdf NOCAmap1_geo.tiff
The ImportImagePlugin needs to be installed in JOSM to use GeoTiff images.