Earthsys 144: Fundamentals of GIScience
Spatial Analytic Models
where is your data? gis.stanford.edu
Stace's Office Hours
I will be available for Open Office Hours on these date/times for the rest of the Quarter!! Come with troubleshooting, questions, etc...!
- Wednesday May 22 - 9am to Noon at the Stanford Geospatial Center Lab in Branner Earth Science Library
- Thursday May 23 - 9am to Noon at the Stanford Geospatial Center Lab in Branner Earth Science Library
- Wednesday May 29 - 9am to 11am at the Stanford Geospatial Center Lab in Branner Earth Science Library
- Thursday May 30 - 9am to Noon at the Stanford Geospatial Center Lab in Branner Earth Science Library
- Friday May 31 - 9am to Noon at the Stanford Geospatial Center Lab in Branner Earth Science Librar
(Analytic) Spatial Models
In general, analytic spatial models can be classed as:
- Cartographic Models
- Simple Spatial Models
- Spatial-temporal models
Cartographic Models
Cartographic Models
Ranking Criteria
Continuous Rank Layers
a) Sites should be far enough from a main road to offer some privacy, but not so far as to be isolated.
b) Slopes should not be too steep. Steep slopes may substantially increase costs or may preclude construction.
Relative Importance Ranking
Simple Spatial Models
Simple Spatial Models
Revised Universal Soil Loss Equation (RUSLE)
E=R*K*C*P*L*S
- E is average annual erosion,
- R is a rainfall factor,
- K reflects soil erodibility,
- C integrates crop effects,
- P accounts for management practices,
- L reflects slope length, and
- S represents steepness.
Spatio-temporal Models
Often cell-based models
Tobler's Hiking Function
r=6exp(−3.5∣S+0.05∣)
r=6exp(−3.5|S+0.05|)
r
r
= the walking rate in km/hr
S
S
= slope degrees
Spatio-temporal Models
Tobler's Hiking Function
Models & 'Scripting'
QGIS Modeler
Earth Engine Example
https://code.earthengine.google.com/?accept_repo=users/stacemaples/SGC-EE101
Should already be in your EE101 Samples Scripts
Welcome back this is week two and we're gonna start diving deeper into this stuff this week with data models...
Earthsys 144: Fundamentals of GIScience Spatial Analytic Models where is your data? gis.stanford.edu