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5. Altitude consideration

5. Perspective Five: Altitude consideration
Currently, only NAC has an extension to handle altitude. XX code also has it. To handle altitude, you need to be careful that altitude from sea level, from geoid level, or from ground. Also, it could be negative number. Sometimes, it is more convenient to use floor number than altitude in meter or feet.
Most GEOCODEs can handle only latitude and longitude.