Masih berada pada 1964. Antara perkembangan surveying di Amerika Syarikat adalah;
1964 Berlaku gempa bumi di Alaska. [Major response to Good Friday Alaska Earthquake].
1961-1976 Transcontinental Traverse (TCT) conducted to
improve the scale of the network for the space program with an accuracy of
1:1,000,000
Source: ngs noaa - link.
Alaska Earthquake 1964
source: history dot com - link
- - - - -
