SRTM and ASTER tidal refences

yianniyianni Global Mapper UserPosts: 100Trusted User
Hi all,

does anyone know what SRTM and ASTER are referenced to? Lowest / Highest Astronomical Tide or Mean Water Level etc?

thanks all

y

Best Answer

  • CarrickConCarrickCon Posts: 55
    Answer ✓
    HI Yianni,

    A quick Google search indicates that the vertical datum of ASTER DEM and SRTM is mean sea level and is based on the WGS84 Earth Gravitational Model (EGM 96) geoid

    However, be careful as while such data is often adequately accurate in a relative sense, it is not very accurate in a vertical sense (here in Western Australia there is +/- 3 to 4 m difference between both datasets and Australian Height Datum). There are many peer reviewed papers discussing the vertical accuracy of SRTM and ASTER data online.

    Cheers,
    /al
                            

Answers

  • Sorry Yianni I should have said the following above "However, be careful as while such data is often adequately accurate in a relative sense, it is not very accurate in an absolute sense". My bad! 
  • yianniyianni Global Mapper User Posts: 100Trusted User
    Hello

    many thanks for this! I have been googling it as well but wasn't getting anywhere so I came here to check with the global mapper crew.

    much appreciated!

    yiannis
Sign In or Register to comment.