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Samenvatting Bim 1.4

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built environment hva - Samenvatting bim 1.4

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BIM HOORCOLLEGE 1 – GIS
GIS: Geografisch Informatie Systeem

Vroeger was GIS het terrein van de specialist (geodeet)



GIS: Datebase

- GIS-software legt de relatie tussen de geografische gegevens (locatie) eb de
attribuutgegevens.

GIS Informatie overheid

- Nationaal Georegister
- PDOK Publieke diensten op de kaart
- AHN Actuele Hoogtekaart Nederland

Vorm van de aarde

Nederland: NAP (Normaal Amsterdams Peil)

- Geoïde (gemiddeld zeeniveau)
- Afwijking t.o.v. van ellipsoïde nodig om hoogtes te berekenen uit gps-gegevens.

Kaartprojecties




Een kaartprojectie is altijd een compromis




1

,Coördinatensystemen
ITRS

- Wereldcoördinatensysteem gebaseerd op best passende ellipsoïde voor de hele wereld.
- Plaattectoniek: ligging plaatsen verandert t.o.v. elkaar
- Vergeleken sterren quasars als vaste referentiepunten.

WGS84

- Voor gps: Regelmatige updates
- Correcties voor o.a. plaat tektonische verschuivingen.

ETRS89

- Voor nauwkeurige plaatsbepaling is coördinatenstelsel gewenst dat zo min mogelijk
‘’verschuift’’
- Voor Europa is dit ERTS89
- Referentiepunt op Euraziatische plaat
- Deze beweegt ongeveer 2cm per jaar in Noordoostelijke richting




2

, Soorten GIS

- Raster – GIS
- Vector – GIS




GIS Analyse

- Buffers
- Overlay Analyse

3

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