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Altitude incorrect

Question asked by Tony Gilbert on Jul 13, 2018

We recently used Trimble Catalyst to collect ground control point data for a site we were mapping with our drone and it returned altitudes of around 83-92m after antenna height correction. However all spatial data for this site from lidar surveys and government mapping (GDA 94 Zone 56) shows the altitude to be around 40m AMSL. How do we account for this huge difference? And how do we correct it back to the standard altitudes?

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