Mapmaking has been vastly improved with the use of aerial Photography and radar. The level of accuracy has increased and remote areas are now accessible.
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The main tool is Doppler radar, which can remotely measure wind speed and direction. This can be used to find rotation in a storm associate with a possible tornado. Another, recently developed tool is dual-polarized radar. Unlike conventional radar, this radar can distinguish between rain, hail, and tornadic debris.
Magellan, a JPL-led project, used synthetic aperture radar to map Venus. Martin Marietta in Denver built the spacecraft, Hughes in El Segundo built the radar.
ground clutter and evaporation are the limitations of radar maps
yes
they are not always correct