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

On-Screen/Head's Up Digitization

Feature Generalization

https://slides.com/staceymaples/digitizingdata

https://slides.com/staceymaples/digitizingdata

How long is the coast of Britain?

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

Errors

Undershoots  & Overshoots

Node & Line Snapping

Reshaping

Error Across Layers

Resampling Raster Geometries

Let's talk about this Final Project Proposal

What your proposal should include:

• Spatial Question or Project Idea
• Bibliography of any published work you are referencing
• Brief description of the way you might answer your question
• Data Sources that you have identified as useful and type (digital, scanned maps, tabular, etc...)
• Software or platform you are interested in using
• What will the final product be (web map, datasets, print maps, 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

planet.com

https://slides.com/staceymaples/digitizingdata

Google Earth Engine Data Catalog

https://slides.com/staceymaples/digitizingdata

Stanford Data Farm

https://slides.com/staceymaples/digitizingdata

Demographics

https://www.nhgis.org/

https://simplyanalytics.com

census.gov

https://slides.com/staceymaples/digitizingdata

DavidRumsey.com

https://slides.com/staceymaples/digitizingdata

data.gov

https://slides.com/staceymaples/digitizingdata

https://hub.arcgis.com/

https://slides.com/staceymaples/digitizingdata

Google Earth Engine

https://slides.com/staceymaples/digitizingdata

Humanitarian Open StreetMap

https://slides.com/staceymaples/digitizingdata

OpenStreetMap.org

https://slides.com/staceymaples/digitizingdata

OpenStreetMap

https://overpass-turbo.eu/

https://slides.com/staceymaples/digitizingdata

Natural Earth

https://slides.com/staceymaples/digitizingdata

Humanitarian Data  Exchange

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