Page History

h2. General


{html}
<!-- 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>    
{html}
{html}
<img src="http://lab.linkeddata.deri.ie/2010/lod-badges/img/data-badge-3.png" alt="three star open Web data" />
{html}


h2. Formats

The data is available in pointclouds (las) and as a map (tiff).




h2. Services

Using the AHN2 as a background map can be done using one of the WMS services:

The full list is available at [https://www.pdok.nl/nl/producten/pdok-services/overzicht-urls]

The relevant url's are:
WMS:
- [http://geodata.nationaalgeoregister.nl/ahn1/wms]
- [http://geodata.nationaalgeoregister.nl/ahn2/wms]

WFS:
- [http://geodata.nationaalgeoregister.nl/ahn1/wfs]
- [http://geodata.nationaalgeoregister.nl/ahn2/wfs]

WMTS:
- [http://geodata.nationaalgeoregister.nl/tiles/service/wmts/ahn1]
- [http://geodata.nationaalgeoregister.nl/tiles/service/wmts/ahn2]

WCS
- [http://geodata.nationaalgeoregister.nl/ahn1/wcs]
- [http://geodata.nationaalgeoregister.nl/ahn2/wcs]

If you're using QGIS you can use the [pdok plugin|http://plugins.qgis.org/plugins/pdokservicesplugin/] which is very [handy|http://www.qgis.nl/2012/10/20/eenvoudige-pdok-services-plugin-voor-qgis/] (in dutch).

h2. 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]


h2. Examples

h4. Qgis

Load the PDOK plugin. Add the AHN2 WMTS service from the list (for viewing). You should see something like:

!ahn2_in_qgis.png|thumbnail!

h4. Python

Notebook: [https://svn.oss.deltares.nl/repos/openearthtools/trunk/python/notebooks/ahn2.ipynb]

h4. Matlab

OpenEarthTOols has a function {{wcs}} and {{wms}} for using the web services, which can be dowloaded [here|https://svn.oss.deltares.nl/repos/openearthtools/trunk/matlab/applications/arcgis/] after [registration|Join+OpenEarth].

{code}
server = 'http://geodata.nationaalgeoregister.nl/ahn2/wms?';
[url,OPT,lim] = wcs('server',server,...
    'coverage','ahn2:ahn2_5m',... % shoudl not work: GeoTIFF (case)
    'format','GeoTiff',...
    'crs','epsg:4326',...
    'axis',[94000 466000 96000 468000],...
    'resx',5,'resy',5);
{code}

!ahn2_ahn2_5mGeoTIFF.png|width=400px!

h4. otherOther

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 v1.1.0, only 1.0.0 and 1.1.1.
The WMTS layer does not seem to work when zoomed out in QGIS.