From Pixels to Points

Digitizing Spatial Data

where is your data? gis.stanford.edu

https://bit.ly/pixels2pointslive

about me

https://slides.com/staceymaples/spatial101/live

https://bit.ly/pixels2pointslive

gis.stanford.edu

https://bit.ly/pixels2pointslive

Modeling the World

https://bit.ly/pixels2pointslive

Data Models

https://bit.ly/pixels2pointslive

Everything is somewhere, but how do we say where?

https://bit.ly/pixels2pointslive

Coordinate Systems

https://bit.ly/pixels2pointslive

Geographic Coordinates

https://bit.ly/pixels2pointslive

Projections

Think of them as translations from 3d to 2d

https://bit.ly/pixels2pointslive

Vector Data

https://slides.com/staceymaples/spatial101/live

https://www.google.com/maps/place/0%C2%B000'00.0%22N+0%C2%B000'00.0%22E/@0.032569,-0.1126927,117017m/data=!3m1!1e3!4m2!3m1!1s0x0:0x0

Vector Formats

Shapefiles*

*(a shapefile isn't really a file)

*.shp
*.shx
*.dbf
*.prj

GeoJSON

https://geojson.org/

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "Label": "\"Null Island\""
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          0,
          0
        ]
      }
    },