August 5, 2020 NGS releases modernized National Spatial Reference System updates By David B. Zilkoski
June 3, 2020 Why users will need to perform GNSS occupations as part of a leveling project after 2022 By David B. Zilkoski
April 1, 2020 The differences between published Geoid18 and Geoid12B values in Southern Louisiana By David B. Zilkoski
February 5, 2020 The differences between Geoid18 values and NAD 83, NAVD 88 values By David B. Zilkoski
![Figure 27: GRACE Trend over CONUS from UTCSR RL06 Model [mm/yr] (Source: Figure 27 from Technical Report NOS NGS 69)](https://stage.gpsworld.com/wp-content/uploads/zilkoski-december-2019-column-image-19.jpg)
