Welcome to Introduction to GIS Software: QGIS, Class 12

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Introduction to GIS Software: QGIS

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what is georeferencing?

what is nice about Landsat?

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2007: all Landsat imagery becomes free

what does it mean to say aerial imagery has 30m resolution?

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(2010, Deepwater Horizon)

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FAA and Coast Guard enforced a media blackout

So aerial imagery could not be collected with airplanes

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"We're going to make our own aerial pictures of this oil sheen as it's approaching our island. We're going to get images of what our wetlands look like before they got covered in oil."

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"While mapping the oil spill, we were not trying to duplicate the satellite or flyover imagery..."

"...we were helping Gulf Coast residents to use balloons, kites, and other simple and inexpensive tools to produce their own documentation of the disaster."

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"Gowanus sewage scum is typically made up of ground up styrofoam particles, ...

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... to which sewage bacterias, restaurant grease and algae then attach themselves"

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in-class excercise, part 1

open data

open data

data that is:

open data

data that is:

open data

data that is:

data.cityofnewyork.us/Business/Filming-Locations-Scenes-from-the-City-/qb3k-n8mm

collaborative data

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what is OpenStreetMap (OSM)?

a website?

a map?

data on a server somewhere?

a community?

"the free wiki map of the world"

show me the way
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started in 2004 in the UK

started in 2004 in the UK

first State of the Map conference in 2007

started in 2004 in the UK

first State of the Map conference in 2007

over 1 million registered users in 2013

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license

license

Open Database License (ODbL)

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essentially an open source license, but for data

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what does the data look like?

shapes

nodes, ways, closed ways

are just shapes with no meaning until you give them attributes, as in any GIS

so you have to add attributes

an attribute table wouldn't work because:

an attribute table wouldn't work because:

an attribute table wouldn't work because:

tags

key-value pairs

tags

leisure=park

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name=Union Square West

tags

we make them up as we go.

tags

we make them up as we go. really.

folksonomy

folksonomy

a collaborative system of categorization

you can tag things any way you want

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how do you use the data?

metro extracts

mapzen.com/metro-extracts

export

export

we'll use a QGIS plugin for this

garmin dumps

garmin.openstreetmap.nl

garmin dumps

garmin.openstreetmap.nl

get data out of OSM:

in-class excercise, part 2

in-class excercise, part 3