Earthsys 144: Fundamentals of GIScience

Digitizing Spatial Data

where is your data? gis.stanford.edu

https://slides.com/staceymaples/digitizingdata

Hardcopy Sources

https://slides.com/staceymaples/digitizingdata

Digitization

"Heads-down" Digitization

"Heads-up" Digitization

Feature Generalization

https://slides.com/staceymaples/digitizingdata

How long is the coast of Britain?

https://users.math.yale.edu/~bbm3/web_pdfs/howLongIsTheCoastOfBritain.pdf

https://slides.com/staceymaples/digitizingdata

Resampling Raster Geometries

Errors

Undershoots  & Overshoots

Reshaping

(smoothing & thinning)

Error Across Layers

Let's talk about this Final Project Proposal

What your proposal should include:

1. Your Spatial Question or Project Idea Statement
2. Bibliography of any published work you are referencing
3. Brief description of the way you might answer your question (don't worry about vocabulary, yet)
4. MAX of Two Data Sources that you have identified as useful and type (digital, scanned maps, tabular, etc...)
5. Software or platform you are interested in using
6. What will the final product be (web map, datasets, print maps, Web Application, sculpture, etc...)

1 page, or 500 words!

Places to get ideas:

• Your other classes! Double-up!
• Your thesis, paper, current research, etc...
• A need in your community that can be addresses with spatial data
• Write a tutorial!
• Esri Map Book
• learn.arcgis.com - use one of these workflows for a place you are interested in (bonus for converting to a QGIS or GEE workflow!)

The most important component of your project is that you bring YOUR interest to it!

Spatial Data Sources

https://slides.com/staceymaples/digitizingdata

LMGTFY

"Clown Data Shapefile"

geotiff

geojson

geodatabase

etc...

https://slides.com/staceymaples/digitizingdata

earthworks.stanford.edu

https://slides.com/staceymaples/digitizingdata

Google Earth Engine Data Catalog

https://slides.com/staceymaples/digitizingdata

Humanitarian Data  Exchange

https://slides.com/staceymaples/digitizingdata

OpenStreetMap

https://overpass-turbo.eu/

https://slides.com/staceymaples/digitizingdata

planet.com

https://slides.com/staceymaples/digitizingdata

DavidRumsey.com

https://slides.com/staceymaples/digitizingdata

Demographics

https://www.nhgis.org/

https://simplyanalytics.com

census.gov

https://slides.com/staceymaples/digitizingdata

Stanford Data Farm

https://slides.com/staceymaples/digitizingdata

data.gov

https://slides.com/staceymaples/digitizingdata

https://hub.arcgis.com/

https://slides.com/staceymaples/digitizingdata

OpenStreetMap.org

https://slides.com/staceymaples/digitizingdata

Natural Earth

https://slides.com/staceymaples/digitizingdata

The U.S. National Map

https://slides.com/staceymaples/digitizingdata

TopoViewer

https://slides.com/staceymaples/digitizingdata

EarthExplorer.gov

https://slides.com/staceymaples/digitizingdata

Digital Elevation Models

http://srtm.csi.cgiar.org/srtmdata/

https://earthexplorer.usgs.gov/

https://slides.com/staceymaples/digitizingdata

National Hydrology Dataset

WWF Hydrosheds

https://slides.com/staceymaples/digitizingdata

NAIP

National Aerial Imagery Program

https://slides.com/staceymaples/digitizingdata

NLCD

National Landcover Database

https://slides.com/staceymaples/digitizingdata

NASS CDL

National Agricultural Statistical Service Crop Data Layer

https://slides.com/staceymaples/digitizingdata

National Wetlands Inventory

https://slides.com/staceymaples/digitizingdata

USDA Soils data

Digital Floodplain

Geology

oldmapsonline.org