Balloon Mapping ~ Try DIY Aerial Cartography...

If you buy one of these Balloon Mapping kits...

...and follow handy illustrated guide...

...combining in a camera, a sodabottle, and some handy helium...

...then you accumulate aerial pix floating over a topography...

...and stitch them together via MapKnitter or the like... ...then you've done some lovely DIY cartography. Thanks PLOTS!