nz2015--dem38m-only.zip

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a 130mb zip file of New Zealand mesh BGL's for FSX, lod10


Enter ZERO dollars if you want it for free.


It's included with the nz2015 sample photoreal textures zip file at https://gumroad.com/l/XiwcJ, but if you only need the DEM, grab it from here.

Use all thirteen BGL's to get multiple levels of detail.


I compiled it from the publicly released, Geographx-gridded, LINZ contour, coastline, and spot height data, more fully described below.

This Digital Elevation Model has some deficiencies, such as, incorrect riverbed heights, flattened hilltops, noticeable defects in the Milford Sound area, and general steppiness proximate the source contour lines.

Its height accuracy will be better than SRTM or ASTER-GDEM based meshes, but will lack their detail in low-slope areas, as it is constructed from contour lines with a 20m vertical interval, coastlines, and spot heights.

Use this if you don't have a better third party NZ DEM.


It was used in all my 'road trip' videos

https://www.youtube.com/user/antdavisonNZ/search?query=road+trip


click on the distorted global background image to return to my product listings

link to my products

https://gumroad.com/antdavison


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The Geographx New Zealand Digital Elevation Model version 2.1 covers the three main islands of New Zealand (North Is, South Is, Rakiura/Stewart Is) at a cell resolution of 8 metres.

It is prepared primarily from 1:50 000 topographic data from Land Information New Zealand (the LINZ classes used are contour, height, coastline, island, lake, lagoon, pond, reservoir, sand, mud, shingle, reef, shoal, rock (polygons and points) and rock outcrop), with 3-second SRTM data used in a supporting role.

The main criterion in its production is the detailed and accurate depiction of natural landforms. It is therefore suitable primarily for cartographic visualisation. It may also be useful for terrain analysis, before the acquisition of high-resolution data for a region of interest.

Spatial accuracy is nominally the same as for the LINZ source data: 90% of well-defined points are within ±22 metres horizontally and within ±10 metres vertically.


Waterbody elevations

In version 2.1, all LINZ waterbody classes (lake, lagoon, pond and reservoir) are given either a validated LINZ height, or an estimated height.

Validation was performed by correlating LINZ waterbody elevations to the height of the underlying contour, the correlation being used to identify outlying values, which were validated, excluded or (in the case of obvious typographical errors) corrected.  

A revised correlation, along with constrained SRTM heights and information about local convexity or concavity, was then used to estimate all waterbody heights. Parameters were adjusted to minimize RMS difference between estimated height and validated LINZ heights.

Waterbodies with no LINZ elevation (or with an invalidated elevation) were then given the estimated height.


Coastal elevations

Coastal features have been assigned representative elevations. The LINZ coastline and island outlines depict not mean sea level, but high water mark (generally the line of visible debris), and are assigned a constant elevation of 1.5m. Coastal sand, mud and shingle are given elevation 1.0m, while coastal rock, reefs and shoals are assigned 0.5m.

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nz2015--dem38m-only.zip

1 rating
I want this!