Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Google Earth elevation precision

Discussion in 'General Discussion' started by matti, Sep 23, 2016.

  1. matti

    Joined:
    Mar 15, 2016
    Messages:
    401
    Likes Received:
    62
    According to the links below, "in many areas Google Earth uses SRTM (Shuttle Radar Topographic Mapping) data, which offers something like 16m vertical accuracy at 90m horizontal grid spacing. Google Earth doesn't use exclusivly SRTM data, and some places augment it with higher-resolution datasets.

    Individual points are fairly accurate in most cases where the terrain is fairly flat. In mountainous terrain the elevation data is less accurate because the point you are evaluating is not directly on a measured sample point and Google Earth is interpolating between measured points. If you are measuring a road that is in a canyon with steep walls, you can have some variations from point to point".

    Did I get that right?

    Google Groups

    http://dds.cr.usgs.gov/srtm/version2_1/Documentation/MIL-PDF-89020B.pdf
     
  2. alokbhargava

    Joined:
    Sep 28, 2015
    Messages:
    5,145
    Likes Received:
    1,664
    Location:
    San Francisco, CA
    Google earth is pretty accurate for flat areas whereas it loses accuracy on mountainous terrains due to averaging methods used.


    Sent from my iPhone using PhantomPilots