General
The Actueel Hoogtebestand Nederland versie 2
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(AHN2),
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was
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made
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available
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2014-03-06.
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The
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dataset
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covers
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the
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topography
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of
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the
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Netherlands
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(nl),
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measured
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from
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2011
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through
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2012.
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| HTML |
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<img src="http://lab.linkeddata.deri.ie/2010/lod-badges/img/data-badge-3.png" alt="three star open Web data" />
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Formats
The data is available in pointclouds (las)
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and
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as
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a
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map
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(tiff).
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Services
Using the AHN2 as a background map can be done using one of the OGV web services:
The full list is available at https://www.pdok.nl/nl/producten/pdok-services/overzicht-urls
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.
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The
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relevant
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url's
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are:
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WMS:
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WFS:
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WMTS:
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WCS
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If
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you're
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using
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QGIS
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you
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can
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use
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the
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...
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which
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is
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very
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(in
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dutch).
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Downloading
To download the data use one of the atomfeeds to get a list of files.
https://www.pdok.nl/nl/producten/pdok-downloads/atomfeeds
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Examples
Qgis
Load the PDOK plugin. Add the AHN2 WMTS service from the list (for viewing). You should see something like:
Python
The OWSlib package is demonstrated in this Python Notebook: https://svn.oss.deltares.nl/repos/openearthtools/trunk/python/notebooks/ahn2.ipynb
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accessible
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after
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free
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for
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OpenEarth.
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Web
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browser
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For
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using
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WMS
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or
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WCS
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in
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a
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we
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browser
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see
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our
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or
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:
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Matlab
OpenEarthTools has Matlab OGC functions wcs and wms for using the AHN(2)
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web
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services,
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which
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can
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be
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dowloaded
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accessible
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after
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free
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for
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OpenEarth.
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We
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use
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WCS
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here
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so
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we
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can
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use
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our
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own
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colormap
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to
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highlight
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details
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(West
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of
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Netherlands
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is
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roughly
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between
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-5
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for
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polders
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and
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+25
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for
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dunes)
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rather
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then
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WMS
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which
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has
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a
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fixed
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colormap
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(needed
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to
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accommodate
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the
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full
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DEM
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range
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incl.
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Vaalserberg
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at
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+322m)
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} server = 'http://geodata.nationaalgeoregister.nl/ahn2/wms?'; [url,OPT,lim] = wcs('server',server,... 'coverage','ahn2:ahn2_5m',... 'format','GeoTiff',... % only format offered 'crs','epsg:28992',... % RD 'axis',[94000 466000 96000 468000],... % around Kaag 'resx',5,'resy',5); % 5m, native resolution urlwrite(url,['tmp',OPT.format]); im = imread(['tmp',OPT.format]); im(im<-3.402e+38)=NaN; % ahn2 %im(im==-32768 )=NaN; % ahn1 pcolorcorcen(OPT.x,OPT.y,double(im)) tickmap('xy') {code} !ahn2_ahn2_5mGeoTIFF.png! _Note the elevated railway track, the higher elevations of the old dunes of Warmond, the lower elevations in the peat/polders in Leiden North, the deblanked waterways, the townhouse blocks with the deblanked ditches, but also the unfiltered points band in the Kaag lake._ h4. Other Grontmij made a nice [overview of possible use cases|http://www.slideshare.net/XanderBakker/ahn2-voor-waterbeheer-gis-conferentie-2012-grontmij]. h2. Issues The WCS of PDOK.nl does not seem to support |
Note the elevated railway track, the higher elevations of the old dunes of Warmond, the lower elevations in the peat/polders in Leiden North, the deblanked waterways, the townhouse blocks with the deblanked ditches, but also the unfiltered points band in the Kaag lake.
Other
Grontmij made a nice overview of possible use cases.
Issues
The WCS of PDOK.nl does not seem to support v1.1.0,
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only
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1.0.0
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and
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1.1.1.
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The
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WMTS
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layer
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does
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not
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seem
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to
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work
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when
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zoomed
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out
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in
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QGIS.
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The
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elements
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in
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the
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all
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have
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the
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same
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polygon
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(50.6
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3.1
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50.6
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7.3
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53.7
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7.3
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53.7
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3.1
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50.6
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3.1).
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There
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is
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a
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kaartblad_index
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layer
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in
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the
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WFS.
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This
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can
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be
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used
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to
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find
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the
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correct
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coverage
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of
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each
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las
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file.
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Structured
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info
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The
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following
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text
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follows
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the
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convention
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and
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is
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used
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for
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structured
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search
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engines.
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See
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html
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source
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for
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details.
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| HTML |
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<!-- Metadata in schema.org format -->
<div itemscope itemtype="http://schema.org/Dataset">
The <a href="http://www.ahn.nl" itemprop="name">Actueel Hoogtebestand Nederland</a> versie 2
(<span itemprop="name">AHN2</span>), was made available <span itemprop="datePublished">2014-03-06</span>.
The dataset covers the topography of <span itemprop="spatial" itemscope itemtype="http://schema.org/Country">the Netherlands (<span itemprop="address">nl</span>)</span>, measured <span itemprop="temporal" itemscope itemtype="http://schema.org/DateTime"> from <span itemprop="startTime">2011</span> through <span itemprop="endTime">2012</span>.
</div>
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