1 / 11

Point-surface interpolation

Point-surface interpolation. Day 1: point-surface interpolation. Principles Tobler’s First Law of Geography and spatial interpolation Classification of methods Common methods Thiessen polygons Trend surfaces Inverse distance weighting (IDW) TINs Geostatistical Analyst in ArcMap.

gerek
Download Presentation

Point-surface interpolation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Point-surface interpolation

  2. Day 1: point-surface interpolation • Principles • Tobler’s First Law of Geography and spatial interpolation • Classification of methods • Common methods • Thiessen polygons • Trend surfaces • Inverse distance weighting (IDW) • TINs • Geostatistical Analyst in ArcMap

  3. Principles of interpolation • Tobler’s First Law of Geography • “Everything is related to everything else, but near things are more related than distant things.”1 • Spatial interpolation • The procedure of estimating the values of properties at unsampled sites within an area covered by existing observations • important in addressing problem of data availability • quick fix for partial data coverage • interpolation of point data to raster surface • role of filling in the gaps between observations 1W. R. Tobler, (1970) "A computer movie simulating urban growth in the Detroit region". Economic Geography, 46(2): 234-240.

  4. Classification of methods • Methods of spatial interpolation: • many different methods available • e.g. Thiessen polygons • e.g. Inverse distance weighting • classification according to: • exact or approximate • deterministic or stochastic • local or global • gradual or abrupt • Remember! Tobler’s First Law of Geography

  5. Common methods • Thiessen polygons • Gradual or abrupt? • Exact or approximate? • Local or global? • Deterministic or stochastic?

  6. Common methods • Trend surfaces • Gradual or abrupt? • Exact or approximate? • Local or global? • Deterministic or stochastic?

  7. Common methods

  8. Common methods • Inverse Distance Weighting (IDW) • Gradual or abrupt? • Exact or approximate? • Local or global? • Deterministic or stochastic?

  9. Common methods • Triangulated Irregular Networks (TINs) • Gradual or abrupt? • Exact or approximate? • Local or global? • Deterministic or stochastic?

  10. Geostatistical analyst • Geostatistical analyst in ArcMap

  11. Practical exercise • Hands-on Exercise #2 • Interpolating point data in ArcGIS

More Related