GIS Blog

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…And Standing Up Straight

In this post we cover New Zealand’s new gravity-based vertical datum, NZVD2016.  Along the way we’ll get familiar with the weirdly wonderful geoid and WGS84.  This post follows on from Keeping Our Heads Above Water, hence the title, and has benefited greatly from comments by LINZ’s Geodetic team – thanks! In a previous post we…

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Keeping Our Heads Above Water

In this post we discuss the highs and lows of sea level. So everyone knows where sea level is, right?  When we talk about elevation, we usually put it in the context of how far above (or below) sea level something is.  Simple, yes?  Well….not quite.  Sea level is one of those things that’s easily…

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