Presentatie GeoBuzz 2018: MD-kwadraat (Marco Duiker): Werken met de BGT

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De BGT is een mooi maar complex product. In de dagelijkse praktijk valt het werken met de BGT in een GIS-pakket als QGIS niet mee. Vaak gaat er ongemerkt (!) heel wat mis waardoor bijvoorbeeld in analyses verkeerde resultaten ontstaan. In deze presentatie wordt uitgelegd waarom de wijze waarop wij de BGT (en andere basisregistraties) opslaan in gml leidt tot fouten in het gebruik in een GIS-pakket. Uiteraard wordt ook uitgelegd hoe deze fouten op te sporen en te voorkomen. Voor mensen die niet geïnteresseerd zijn in de mogelijke fouten en oplossingen wordt een methode gepresenteerd die “gewoon werkt” in QGIS.

Data & Analytics

MD-kwadraat
alles geo!
Werken met de BGT
Marco Duiker
“Ik wist niet dat SIMCITY
ook in het echt bestond”
Demis Tigchelaar

MD-kwadraat
alles geo!
Werken met de BGT
Open data
Op veel manieren beschikbaar
Wat werkt voor welk probleem?

MD-kwadraat
alles geo!
Services PDOK (WMTS)
Web Mapping Tiling Service (WMTS)
2 Kant en klaar opgemaakte kaarten
2 GEEN Attribuut informatie op een punt !
2 Nuttig voor het maken van een kaartje

MD-kwadraat
alles geo!
Services PDOK (WFS)
Web Feature Service (WFS)
2 Beta
2 Max. 100 features als resultaat
2 GEEN response paging !
2 Nuttig als je (geautomatiseerd) een bevraging wilt doen
waar < 100 features terugkomen.
2 Voorbeeld ?

MD-kwadraat
alles geo!
Services + en -
2 X-platform
2 Lekker makkelijk
2 Erg beperkt qua toepassing

MD-kwadraat
alles geo!
Download site PDOK: GML
Download tegels
2 GML bestand met alle objecten

MD-kwadraat
alles geo!
Inlezen GML
Inlezen GML in een GIS
2 Punten, lijnen en vlakken
2 Meervoudige attributen

MD-kwadraat
alles geo!
Inlezen GML Problemen
Punten, lijnen en vlakken bij 1 object
2 Splitsen over meerdere lagen
2 → 1 object id in meerdere lagen!
2 Wat is de belangrijkste geometrie?
2 Verkeerde gok missende geometrie→

MD-kwadraat
alles geo!
Inlezen GML Problemen
Meervoudig voorkomende attributen
2 Samenvoegen in 1 veld
2 Lastig bij analyseren of

MD-kwadraat
alles geo!
Inlezen GML Problemen
Meervoudig voorkomende attributen
… met meerdere geometrieen
2 Openbareruimtelabel
2 1 label
2 2 punten
2 2 hoeken
2 List voor labels: objecten dupliceren
2 1 object id op meerdere regels
2 Pand
2 Idem? Maar dan alleen voor de punten ...

MD-kwadraat
alles geo!
Inlezen GML
Resultaat
2 Heeeeeel veeeeeel lagen
2 Dataverlies

MD-kwadraat
alles geo!
Inlezen GML
Visualisatie?

MD-kwadraat
alles geo!
GML: + en -
2 Alle data
2 Moeilijk inlezen alsnog dataverlies→
2 X-platform
2 Heeeel veeeel lagen
2 Moeilijk visualiseren

MD-kwadraat
alles geo!
NL Extract
2 Tooling voor het inlezen van o.a. BGT in PostGIS
2 Maandelijkse downloads
2 Visualiseren mbv QGIS project JW van Aalst

MD-kwadraat
alles geo!
NL Extract + en -
2 PostGIS nodig (krachtige analyse mogelijkheden)
2 X-platform
2 Downloads: Heel Nederland in 1 keer
2 Tooling: moeilijk te installeren (onder windows)
2 Voor de Power User

MD-kwadraat
alles geo!
BGT Import Plugin (QGIS)
2 Download GML van de BGT download site
2 Import naar GeoPackage (zonder dataverlies)
2 Styling wordt toegevoegd

MD-kwadraat
alles geo!
BGT Import Plugin (QGIS)

MD-kwadraat
alles geo!
BGT Import Plugin + en -
2 NIET X-platform
2 Makkelijk installeren
2 Makkelijk gebruiken
2 Visualisatie
2 Geen dataverlies
2 Nog steeds heeeeel veeeel lagen

MD-kwadraat
alles geo!
Veel lagen: Scriptje SuperSum

MD-kwadraat
alles geo!
SuperSum QGIS3?
https://gist.github.com/MarcoDuiker/

MD-kwadraat
alles geo!
Conclusies
Kaartje: Service PDOK: WMTS
Beetje data: Service PDOK: WFS
Power Users: NL-Extract
De rest (QGIS): BGT Import plugin
GML inlezen is lastig
– Moeten we nu echt zulke modellering gebruiken?
PAS BIJ GML INLEZEN ALTIJD OP VOOR DATAVERLIES

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Presentatie GeoBuzz 2018: MD-kwadraat (Marco Duiker): Werken met de BGT

1. MD-kwadraat alles geo! Werken met de BGT Marco Duiker “Ik wist niet dat SIMCITY ook in het echt bestond” Demis Tigchelaar

2. MD-kwadraat alles geo! Werken met de BGT Open data Op veel manieren beschikbaar Wat werkt voor welk probleem?

3. MD-kwadraat alles geo! Services PDOK (WMTS) Web Mapping Tiling Service (WMTS) 2 Kant en klaar opgemaakte kaarten 2 GEEN Attribuut informatie op een punt ! 2 Nuttig voor het maken van een kaartje

4. MD-kwadraat alles geo! Services PDOK (WFS) Web Feature Service (WFS) 2 Beta 2 Max. 100 features als resultaat 2 GEEN response paging ! 2 Nuttig als je (geautomatiseerd) een bevraging wilt doen waar < 100 features terugkomen. 2 Voorbeeld ?

5. MD-kwadraat alles geo! Services + en - 2 X-platform 2 Lekker makkelijk 2 Erg beperkt qua toepassing

6. MD-kwadraat alles geo! Download site PDOK: GML Download tegels 2 GML bestand met alle objecten

7. MD-kwadraat alles geo! Inlezen GML Inlezen GML in een GIS 2 Punten, lijnen en vlakken 2 Meervoudige attributen

8. MD-kwadraat alles geo! Inlezen GML Problemen Punten, lijnen en vlakken bij 1 object 2 Splitsen over meerdere lagen 2 → 1 object id in meerdere lagen! 2 Wat is de belangrijkste geometrie? 2 Verkeerde gok missende geometrie→

9. MD-kwadraat alles geo! Inlezen GML Problemen Meervoudig voorkomende attributen 2 Samenvoegen in 1 veld 2 Lastig bij analyseren of

10. MD-kwadraat alles geo! Inlezen GML Problemen Meervoudig voorkomende attributen … met meerdere geometrieen 2 Openbareruimtelabel 2 1 label 2 2 punten 2 2 hoeken 2 List voor labels: objecten dupliceren 2 1 object id op meerdere regels 2 Pand 2 Idem? Maar dan alleen voor de punten ...

11. MD-kwadraat alles geo! Inlezen GML Resultaat 2 Heeeeeel veeeeeel lagen 2 Dataverlies

12. MD-kwadraat alles geo! Inlezen GML Resultaat 2 Heeeeeel veeeeeel lagen 2 Dataverlies

13. MD-kwadraat alles geo! Inlezen GML Visualisatie?

14. MD-kwadraat alles geo! GML: + en - 2 Alle data 2 Moeilijk inlezen alsnog dataverlies→ 2 X-platform 2 Heeeel veeeel lagen 2 Moeilijk visualiseren

15. MD-kwadraat alles geo! NL Extract 2 Tooling voor het inlezen van o.a. BGT in PostGIS 2 Maandelijkse downloads 2 Visualiseren mbv QGIS project JW van Aalst

16. MD-kwadraat alles geo! NL Extract + en - 2 PostGIS nodig (krachtige analyse mogelijkheden) 2 X-platform 2 Downloads: Heel Nederland in 1 keer 2 Tooling: moeilijk te installeren (onder windows) 2 Voor de Power User

17. MD-kwadraat alles geo! BGT Import Plugin (QGIS) 2 Download GML van de BGT download site 2 Import naar GeoPackage (zonder dataverlies) 2 Styling wordt toegevoegd

18. MD-kwadraat alles geo! BGT Import Plugin (QGIS)

19. MD-kwadraat alles geo! BGT Import Plugin + en - 2 NIET X-platform 2 Makkelijk installeren 2 Makkelijk gebruiken 2 Visualisatie 2 Geen dataverlies 2 Nog steeds heeeeel veeeel lagen

20. MD-kwadraat alles geo! Veel lagen: Scriptje SuperSum

21. MD-kwadraat alles geo! Veel lagen: Scriptje SuperSum

22. MD-kwadraat alles geo! SuperSum QGIS3? https://gist.github.com/MarcoDuiker/

23. MD-kwadraat alles geo! Conclusies Kaartje: Service PDOK: WMTS Beetje data: Service PDOK: WFS Power Users: NL-Extract De rest (QGIS): BGT Import plugin GML inlezen is lastig – Moeten we nu echt zulke modellering gebruiken? PAS BIJ GML INLEZEN ALTIJD OP VOOR DATAVERLIES

Presentatie GeoBuzz 2018: MD-kwadraat (Marco Duiker): Werken met de BGT

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