Example of DOV search methods for boreholes (boringen)¶

Use cases explained below¶

Get boreholes in a bounding box
Get boreholes with specific properties
Get boreholes in a bounding box based on specific properties
Select boreholes in a municipality and return depth
Get boreholes based on fields not available in the standard output dataframe
Get borehole data, returning fields not available in the standard output dataframe
Get boreholes in a municipality and where groundwater related data are available

[1]:

%matplotlib inline
import inspect, sys
import warnings; warnings.simplefilter('ignore')

[2]:

# check pydov path
import pydov

Get information about the datatype ‘Boring’¶

[3]:

from pydov.search.boring import BoringSearch
boring = BoringSearch()

A description is provided for the ‘Boring’ datatype:

[4]:

boring.get_description()

[4]:

'In de DOV-databank is elke waarneming van grondlagen een boring. Bij de meeste boringen wordt er met een boortoestel een gat gemaakt in de ondergrond om de verschillende grondlagen te kunnen beschrijven. Aan de hand van een boring krijg je een beeld van het materiaal in de ondergrond met toenemende diepte. Afhankelijk van het doel waarvoor de boring geplaatst wordt, zal men een geschikte boormethode toepassen. Boringen worden geplaatst voor verkennend bodemonderzoek, monstername van het sediment en/of grondwater, bepaling van bodemfysische parameters, milieuhygiënisch onderzoek,… Afhankelijk van de diepte, soort materiaal, en het al dan niet boren tot onder de grondwatertafel kan men kiezen uit verscheidene systemen voor handmatig of machinaal te boren. Het bodemmateriaal dat vrijkomt, kan gebruikt worden om een profiel van de ondergrond op te stellen of om er grondmonsters van te nemen om verdere analyses op uit te voeren. Vaak is het de bedoeling een put uit te bouwen zodat water kan gewonnen worden (zie ook grondwatermeetnet en grondwatervergunningen). Soms worden boringen uitgevoerd om een aantal geotechnische karakteristieken te bepalen of om wetenschappelijk onderzoek uit te voeren. Oppervlakkige waarnemingen van de ondergrond noemen we ook boringen. Vooral rond 1900 beschreven een aantal geologen vaak de oppervlakkige lagen. In de databank staan er dan ook verschillende boringen met een diepte van 0 meter. Het gaat vooral om weginsnijdingen of om zichtbare lithologische kenmerken langs de oppervlakte.'

The different fields that are available for objects of the ‘Boring’ datatype can be requested with the get_fields() method:

[5]:

fields = boring.get_fields()

# print available fields
for f in fields.values():
    print(f['name'])

id
boornummer
pkey_boring
rapport
diepte_boring_tot
datum_aanvang
namen
putnummer
x
y
start_boring_mtaw
gemeente
uitvoerder
doel
methode
erkenning
opdrachtgever
informele_stratigrafie
formele_stratigrafie
lithologische_beschrijving
gecodeerde_lithologie
hydrogeologische_stratigrafie
quartaire_stratigrafie
geotechnische_codering
informele_hydrostratigrafie
doorheen_quartair
dikte_quartair
tertiair_onder_quartair
opdrachten
eerste_invoer
geom
diepte_boring_van
boorgatmeting
diepte_methode_van
diepte_methode_tot
boormethode
mv_mtaw

You can get more information of a field by requesting it from the fields dictionary: * name: name of the field * definition: definition of this field * cost: currently this is either 1 or 10, depending on the datasource of the field. It is an indication of the expected time it will take to retrieve this field in the output dataframe. * notnull: whether the field is mandatory or not * type: datatype of the values of this field

[6]:

fields['diepte_boring_tot']

[6]:

{'name': 'diepte_boring_tot',
 'definition': 'Maximumdiepte van de boring ten opzichte van het aanvangspeil, in meter.',
 'type': 'float',
 'notnull': False,
 'query': True,
 'cost': 1}

Optionally, if the values of the field have a specific domain the possible values are listed as values:

[7]:

fields['methode']['values']

[7]:

{'Meerdere technieken': None,
 'avegaarboring': None,
 'droge boring': None,
 'edelmanboring': None,
 'geen boring': None,
 'gestoken boring': None,
 'graafmachine': None,
 'handboring': None,
 'kernboring': None,
 'lansen': None,
 'lepelboring': None,
 'luchthamer': None,
 'luchthevelboren of air-lift boren': None,
 'meerdere technieken': None,
 'omgek. spoelboring': None,
 'onbekend': None,
 'pulsboring': None,
 'ramkernboring': None,
 'rollerbit': None,
 'slagboring': None,
 'spade': None,
 'spiraalboring': None,
 'spoelboring': None,
 'steenboring': None,
 'trilboring': None,
 'zuigboring': None}

Example use cases¶

Get boreholes in a bounding box¶

Get data for all the boreholes that are geographically located within the bounds of the specified box.

The coordinates are in the Belgian Lambert72 (EPSG:31370) coordinate system and are given in the order of lower left x, lower left y, upper right x, upper right y.

[8]:

from pydov.util.location import Within, Box

df = boring.search(location=Within(Box(153145, 206930, 153150, 206935)))
df.head()

[000/001] .
[000/001] .

[8]:

	pkey_boring	boornummer	x	y	mv_mtaw	start_boring_mtaw	gemeente	diepte_boring_tot	datum_aanvang	uitvoerder	boorgatmeting	diepte_methode_van	diepte_methode_tot	boormethode
0	https://www.dov.vlaanderen.be/data/boring/1974...	GEO-74/254-b1	153147.0	206931.0	14.12	14.12	Antwerpen	14.05	1974-07-02	Rijksinstituut voor Grondmechanica	False	0.0	1.30	lepelboring
1	https://www.dov.vlaanderen.be/data/boring/1974...	GEO-74/254-b1	153147.0	206931.0	14.12	14.12	Antwerpen	14.05	1974-07-02	Rijksinstituut voor Grondmechanica	False	1.3	13.50	pulsboring
2	https://www.dov.vlaanderen.be/data/boring/1974...	GEO-74/254-b1	153147.0	206931.0	14.12	14.12	Antwerpen	14.05	1974-07-02	Rijksinstituut voor Grondmechanica	False	13.5	14.05	lepelboring

The dataframe contains one borehole where three methods (‘boormethode’) were applied for its construction. The available data are flattened to represent unique attributes per row of the dataframe.

Using the pkey_boring field one can request the details of this borehole in a webbrowser:

[9]:

for pkey_boring in set(df.pkey_boring):
    print(pkey_boring)

https://www.dov.vlaanderen.be/data/boring/1974-010351

Get boreholes with specific properties¶

Next to querying boreholes based on their geographic location within a bounding box, we can also search for boreholes matching a specific set of properties. For this we can build a query using a combination of the ‘Boring’ fields and operators provided by the WFS protocol.

A list of possible operators can be found below:

[10]:

[i for i,j in inspect.getmembers(sys.modules['owslib.fes2'], inspect.isclass) if 'Property' in i]

[10]:

['PropertyIsBetween',
 'PropertyIsEqualTo',
 'PropertyIsGreaterThan',
 'PropertyIsGreaterThanOrEqualTo',
 'PropertyIsLessThan',
 'PropertyIsLessThanOrEqualTo',
 'PropertyIsLike',
 'PropertyIsNotEqualTo',
 'PropertyIsNull',
 'SortProperty']

In this example we build a query using the PropertyIsEqualTo operator to find all boreholes that are within the community (gemeente) of ‘Herstappe’:

[11]:

from owslib.fes2 import PropertyIsEqualTo

query = PropertyIsEqualTo(propertyname='gemeente',
                          literal='Herstappe')
df = boring.search(query=query)

df.head()

[000/001] .
[000/002] ..

[11]:

	pkey_boring	boornummer	x	y	mv_mtaw	start_boring_mtaw	gemeente	diepte_boring_van	diepte_boring_tot	datum_aanvang	uitvoerder	boorgatmeting	diepte_methode_van	diepte_methode_tot	boormethode
0	https://www.dov.vlaanderen.be/data/boring/2016...	kb33d106e-B236	224687.4	158191.0	124.0	124.0	Herstappe	0.0	6.0	NaN	Belgische Geologische Dienst (BGD)	False	0.0	6.0	gestoken boring
1	https://www.dov.vlaanderen.be/data/boring/1993...	kb41d120e-B1027	224820.0	157794.0	132.0	132.0	Herstappe	0.0	50.0	1993-09-02	Peeters-Ramsel	False	0.0	50.0	onbekend

Once again we can use the pkey_boring as a permanent link to the information of these boreholes:

[12]:

for pkey_boring in set(df.pkey_boring):
    print(pkey_boring)

https://www.dov.vlaanderen.be/data/boring/2016-125511
https://www.dov.vlaanderen.be/data/boring/1993-096210

Get boreholes in a bounding box based on specific properties¶

We can combine a query on attributes with a query on geographic location to get the boreholes within a bounding box that have specific properties.

The following example requests the boreholes with a depth greater than or equal to 2000 meters within the given bounding box.

(Note that the datatype of the literal parameter should be a string, regardless of the datatype of this field in the output dataframe.)

[13]:

from owslib.fes2 import PropertyIsGreaterThanOrEqualTo

query = PropertyIsGreaterThanOrEqualTo(
            propertyname='diepte_boring_tot',
            literal='2000')

df = boring.search(
    location=Within(Box(200000, 211000, 205000, 214000)),
    query=query
    )

df.head()

[000/001] .
[000/006] ......

[13]:

	pkey_boring	boornummer	x	y	mv_mtaw	start_boring_mtaw	gemeente	diepte_boring_tot	datum_aanvang	uitvoerder	boorgatmeting	diepte_methode_van	diepte_methode_tot	boormethode
0	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102782	201775.5	212960.0	25.0	25.0	Mol	3600.0	NaN	NaN	False	0.0	0.0	onbekend
1	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102783	201798.0	212963.0	25.0	25.0	Mol	3600.0	NaN	NaN	False	0.0	0.0	onbekend
2	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102784	201768.0	212959.0	25.0	25.0	Mol	4905.0	2017-12-13	THV Daldrup - Smet	True	0.0	207.0	zuigboring
3	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102784	201768.0	212959.0	25.0	25.0	Mol	4905.0	2017-12-13	THV Daldrup - Smet	True	207.0	4905.0	spoelboring
4	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102785	201790.5	212962.0	25.0	25.0	Mol	4341.0	2016-03-02	THV Daldrup - Smet	True	0.0	4341.0	spoelboring

We can look at one of the boreholes in a webbrowser using its pkey_boring:

[14]:

for pkey_boring in set(df.pkey_boring):
    print(pkey_boring)

https://www.dov.vlaanderen.be/data/boring/2016-148766
https://www.dov.vlaanderen.be/data/boring/2016-148765
https://www.dov.vlaanderen.be/data/boring/2016-148763
https://www.dov.vlaanderen.be/data/boring/2016-148767
https://www.dov.vlaanderen.be/data/boring/2016-148770
https://www.dov.vlaanderen.be/data/boring/2016-148764

Select boreholes in a municipality and return depth¶

We can limit the columns in the output dataframe by specifying the return_fields parameter in our search.

In this example we query all the boreholes in the city of Ghent and return their depth:

[15]:

query = PropertyIsEqualTo(propertyname='gemeente',
                          literal='Gent')
df = boring.search(query=query,
                   return_fields=('diepte_boring_tot',))
df.head()

[000/001] .

[15]:

	diepte_boring_tot
0	42.0
1	32.0
2	59.0
3	11.0
4	27.0

[16]:

df.describe()

[16]:

	diepte_boring_tot
count	3228.000000
mean	17.513166
std	33.892332
min	0.000000
25%	2.000000
50%	6.500000
75%	20.000000
max	660.000000

By discarding the boreholes with a depth of 0 m, we get a different result:

[17]:

df[df.diepte_boring_tot != 0].describe()

[17]:

	diepte_boring_tot
count	2571.000000
mean	21.988526
std	36.659225
min	0.100000
25%	5.000000
50%	10.000000
75%	22.000000
max	660.000000

[18]:

ax = df[df.diepte_boring_tot != 0].boxplot()
ax.set_ylabel("Depth (m)");
ax.set_title("Distribution borehole depth Gent");

../_images/notebooks_search_boringen_39_0.png

Get boreholes based on fields not available in the standard output dataframe¶

To keep the output dataframe size acceptable, not all available WFS fields are included in the standard output. However, one can use this information to select boreholes as illustrated below.

For example, make a selection of the boreholes in municipality the of Antwerp, for which a hydrogeological interpretation was performed:

[19]:

from owslib.fes2 import And

query = And([PropertyIsEqualTo(propertyname='gemeente',
                               literal='Antwerpen'),
             PropertyIsEqualTo(propertyname='hydrogeologische_stratigrafie',
                               literal='True')]
            )
df = boring.search(query=query,
                   return_fields=('pkey_boring', 'boornummer', 'x', 'y', 'diepte_boring_tot', 'datum_aanvang'))
df.head()

[000/001] .

[19]:

	pkey_boring	boornummer	x	y	diepte_boring_tot	datum_aanvang
0	https://www.dov.vlaanderen.be/data/boring/1937...	kb7d14e-B82	145457.0	224973.5	10.0	1937-01-01
1	https://www.dov.vlaanderen.be/data/boring/1969...	kb7d14e-B110	143700.4	228086.3	12.0	1969-01-01
2	https://www.dov.vlaanderen.be/data/boring/1966...	kb7d14e-B115	143067.0	227707.6	66.0	1966-01-01
3	https://www.dov.vlaanderen.be/data/boring/1966...	kb7d14e-B117	144770.5	223430.6	49.0	1966-01-01
4	https://www.dov.vlaanderen.be/data/boring/1970...	kb7d14e-B121	143597.8	223498.6	11.9	1970-01-01

Get borehole data, returning fields not available in the standard output dataframe¶

As denoted in the previous example, not all available fields are available in the default output frame to keep its size limited. However, you can request any available field by including it in the return_fields parameter of the search:

[20]:

query = PropertyIsGreaterThanOrEqualTo(
            propertyname='diepte_boring_tot',
            literal='2000')

df = boring.search(query=query,
                   return_fields=('pkey_boring', 'boornummer', 'diepte_boring_tot',
                                  'informele_stratigrafie', 'formele_stratigrafie', 'lithologische_beschrijving',
                                  'gecodeerde_lithologie', 'hydrogeologische_stratigrafie', 'quartaire_stratigrafie',
                                  'geotechnische_codering', 'informele_hydrostratigrafie'))

df.head()

[000/001] .

[20]:

	pkey_boring	boornummer	diepte_boring_tot	informele_stratigrafie	formele_stratigrafie	lithologische_beschrijving	gecodeerde_lithologie	hydrogeologische_stratigrafie	quartaire_stratigrafie	geotechnische_codering	informele_hydrostratigrafie
0	https://www.dov.vlaanderen.be/data/boring/1981...	kb8d7e-B224	2517.0	True	True	True	False	False	False	False	False
1	https://www.dov.vlaanderen.be/data/boring/1952...	kb8d17e-B272	2705.0	True	True	True	True	True	False	False	False
2	https://www.dov.vlaanderen.be/data/boring/1935...	kb17d31e-B197	2034.0	True	True	False	True	True	False	False	False
3	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102782	3600.0	False	False	False	False	False	False	False	False
4	https://www.dov.vlaanderen.be/data/boring/2016...	B/1-102783	3600.0	False	False	False	False	False	False	False	False

Get boreholes in a municipality and where groundwater related data are available¶

The following full example return all boreholes where gemeente is ‘Antwerpen’ and either putnummer is not empty or doel starts with ‘Grondwater’ or erkenning is ‘2. Andere grondwaterwinningen’.

[21]:

from owslib.fes2 import PropertyIsLike
from owslib.fes2 import PropertyIsNull
from owslib.fes2 import Or
from owslib.fes2 import Not

query = And([PropertyIsEqualTo(propertyname='gemeente',
                               literal='Antwerpen'),
             Or([Not([PropertyIsNull(propertyname='putnummer')]),
                PropertyIsLike(propertyname='doel',
                               literal='Grondwater%'),
                PropertyIsEqualTo(propertyname='erkenning',
                                  literal='2. Andere grondwaterwinningen')]
               )]
           )
df = boring.search(query=query)
df.head()

[000/001] .
[000/173] ..................................................
[050/173] ..................................................
[100/173] ..................................................
[150/173] .......................

[21]:

	pkey_boring	boornummer	x	y	mv_mtaw	start_boring_mtaw	gemeente	diepte_boring_tot	datum_aanvang	uitvoerder	boorgatmeting	diepte_methode_tot	boormethode
0	https://www.dov.vlaanderen.be/data/boring/1967...	kb7d14e-B183	144379.9	222861.3	9.04	9.04	Antwerpen	12.0	1967-01-01	Smet - Dessel	False	12.0	spoelboring
1	https://www.dov.vlaanderen.be/data/boring/1967...	kb7d14e-B184	144631.1	222928.6	8.60	8.60	Antwerpen	17.0	1967-01-01	Smet - Dessel	False	17.0	spoelboring
2	https://www.dov.vlaanderen.be/data/boring/1967...	kb7d14e-B185	144883.9	223009.9	8.20	8.20	Antwerpen	12.0	1967-01-01	Smet - Dessel	False	12.0	spoelboring
3	https://www.dov.vlaanderen.be/data/boring/1967...	kb7d14e-B186	144712.5	222672.3	8.55	8.55	Antwerpen	12.0	1967-01-01	Smet - Dessel	False	12.0	spoelboring
4	https://www.dov.vlaanderen.be/data/boring/1967...	kb7d14e-B187	144969.5	222737.8	8.25	8.25	Antwerpen	12.0	1967-01-01	Smet - Dessel	False	12.0	spoelboring

Visualize results¶

Using Folium, we can display the results of our search on a map.

[22]:

# import the necessary modules (not included in the requirements of pydov!)
import folium
from folium.plugins import MarkerCluster
from pyproj import Transformer

[23]:

# convert the coordinates to lat/lon for folium
def convert_latlon(x1, y1):
    transformer = Transformer.from_crs("epsg:31370", "epsg:4326", always_xy=True)
    x2,y2 = transformer.transform(x1, y1)
    return x2, y2

df['lon'], df['lat'] = zip(*map(convert_latlon, df['x'], df['y']))
# convert to list
loclist = df[['lat', 'lon']].values.tolist()

[24]:

# initialize the Folium map on the centre of the selected locations, play with the zoom until ok
fmap = folium.Map(location=[df['lat'].mean(), df['lon'].mean()], zoom_start=12)
marker_cluster = MarkerCluster().add_to(fmap)
for loc in range(0, len(loclist)):
    folium.Marker(loclist[loc], popup=df['boornummer'][loc]).add_to(marker_cluster)
fmap

[24]:

Make this Notebook Trusted to load map: File -> Trust Notebook