NAME
r.in.ahn - Imports the 0.5 meter resolution dtm or dsm from the AHN (Actueel Hoogtebestand Nederland (AHN), version 4.
KEYWORDS
dem,
raster,
import
SYNOPSIS
r.in.ahn
r.in.ahn --help
r.in.ahn [-tg] product=string output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -t
- Download whole tiles
- Download the selected product for the AHN tile that overlap with the current region. If enabled, a vector layer with the bounds of the AHN tiles will be saved, using the output name with as suffix _tiles
- -g
- Set to original computational region
- After downloading and importing the requested layer, set the region back to the original computation region.
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- product=string [required]
- product
- Choose which product to download (dsm or dtm)
- Options: dsm, dtm
- output=name [required]
- Name for output raster map
r.in.ahn imports the Actueel Hoogtebestand Nederland (
AHN, version 4) for the current region.
The AHN is a digital elevation model (DEM) of the Netherlands with a
resolution of of 0.5 meter.
There are two different layers available: the digital terrain model
(DTM) and a digital surface model (DSM). The user needs to select which
to download. The selected product will be downloaded for the
computation region. However, note that the region will adjusted to
ensure that the imported raster layer neatly aligns with and has the
same resolution (0.5 meter) as the original AHN data. The resulting
will always have the same or a larger extent than the original
computation region. If you want to store the current computational
region, make sure to first save it using g.region.
The AHN can also be downloaded in map sheets (tiles) of 6.5 by 5
kilometer. To download the area covered by one or more of these tiles,
the user can set the -t flag. This wil to download the area for
the tiles that overlap with the current computational region.
This location only works in a location with the project 'RD New'
(EPSG:28992). Attempts to run it in a location with another CRS will
result in an error message.
The region will be adjusted to ensure that the imported raster layer
neatly aligns with and has the same resolution (0.5 meter) as the
original AHN data. The user can set the -g flag to return the
region to the original computation region after the data is imported.
The addon uses the r.in.wcs addon in the background, so the
user will first need to install this addon.
Import the DTM for Fort Crèvecoeur, an fortress where the river
Old
Dieze flows into the
Maas river.
# Set the region for Fort Crèvecoeur
g.region n=416562 s=415957 w=145900 e=147003 res=0.5
# Download the DSM
r.in.ahn product=dsm output=dsm_crevecoeur
Figure: DSM map of Fort Crèvecoeur
Import the DTM for the tile that overlaps with the current region. Do
this by setting the
-t flag.
# Set the region for Fort Crèvecoeur
g.region n=416562 s=415957 w=145900 e=147003 res=0.5
# Download the DSM
r.in.ahn -t product=dsm output=dsm_crevecoeur2
The result will be a raster layer dsm_crevecoeur2 and a vector
layer dsm_crevecoeur2_tiles
Figure: DSM map of Fort Crèvecoeur. Left shows the extent (red
outline) after running example 2. The extent equals the extent of the
area (tile) for which the data was downloaded. Right shows the extent
(red outline) after running example 3. In this case, the extent is the
same as before running the example because the -g flag was
set.
Set the
-t flag to import the DTM for the tile that overlaps
with the current region. Set the
-g flag to keep the current
computation region after importing the requested data. Note, the
imported data will still have the resolution of, and will be aligned
to, the original AHN data.
# Set the region for Fort Crèvecoeur
g.region n=416562 s=415957 w=145900 e=147003 res=0.5
# Download the DSM
r.in.ahn -t -g product=dsm output=dsm_crevecoeur3
The result will be a raster layer dsm_crevecoeur3 and a vector
layer dsm_crevecoeur3_tiles
See the
AHN webpage for more information
about the AHN data (in Dutch).
Paulo van Breugel |
HAS green academy,
University of Applied Sciences |
Climate-robust
Landscapes research group |
Innovative Bio-Monitoring research group |
Contact:
Ecodiv.earth
SOURCE CODE
Available at:
r.in.ahn source code
(history)
Latest change: Sunday Aug 18 16:05:40 2024 in commit: f9d320e265329f9ec47c8a5ff0ce4876aa53e3e0
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