Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Whats the difference between GEOID96 and GEOID99 (in plain English, please)?

April 26, 2017difference English geoid96 geoid99 plain

0

Posted

Whats the difference between GEOID96 and GEOID99 (in plain English, please)?

1 Answer

0

Posted

Put simply, GEOID99 is an improved version of GEOID96. There was better data in GEOID99 and better computational methods in GEOID99. That meant, overall, a better geoid model. This is most obviously seen in the comparison of each geoid model to GPS on leveled benchmarks. GEOID96 had an absolute agreement of +/- 5.5 cm (1 sigma) relative to 2951 GPS-BMs. GEOID99 has an absolute agreement of +/- 4.6 cm (1 sigma) relative to 6169 GPS-BMs.