Welcome to Advanced GIS, Lecture 12

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Advanced GIS

Class 12

work session next week (4/21)

bring your project and have some questions to work through

project presentations 4/28, 5/5

presentations

around 10 minutes, a few minutes for Q&A

presentations

background for your project—why are you working on it?

presentations

background for your project—why are you working on it?
methodology—what is your process? where is your data from?

presentations

background for your project—why are you working on it?
methodology—what is your process? where is your data from?
dead ends—what went wrong? what did you learn?

presentations

background for your project—why are you working on it?
methodology—what is your process? where is your data from?
dead ends—what went wrong? what did you learn?
what is the current state of your project?

presentations

background for your project—why are you working on it?
methodology—what is your process? where is your data from?
dead ends—what went wrong? what did you learn?
what is the current state of your project?
is there anything specific you want feedback on?

source

at some point you might want to start programming on your own computer

(you don't have to for this class)

a typical process is:

1. edit the code in a code editor

2. test code in your browser

3. put code online with GitHub

code editors:

source

keep each project in a folder

the easiest way to put this in GitHub is dragging and dropping

make sure you select all of the contents of the project folder

you don't have to use GitHub to host a site

source

it's often hard to put your own HTML pages on Wordpress or Squarespace

you might consider hosting a map on Glitch or GitHub, and include the map in another site using an `<iframe>`

<iframe 
  src="https://flaxen-bait.glitch.me/"
  width="500"
  height="400"></iframe>

leaflet plugins

leaflet-control-geocoder

Leaflet.MiniMap

leaflet-markercluster

Leaflet.draw

source

SELECT SUM(number_of_persons_injured)
FROM nypd_motor_vehicle_collisions
WHERE ST_Within(
  ST_Transform(the_geom, 2263),
  ST_Transform(
    ST_SetSRID(ST_GeomFromGeoJSON(geoJSON), 4326),
    2263
  )
)

look through the list of Leaflet plugins and find one or two that are interesting

source

you can get google streetview imagery for a latitude and longitude

source

all you need is latitude, longitude, and ...

source

an API key from google (requires a credit card)

source

more info in the docs

source

you don't have to use Carto for this part

you can get your overlay data from other sources

if you have a GeoJSON, you can load that directly with Leaflet

source

potential drawbacks:

your page will load all of the data at once!

potential drawbacks:

your page will load all of the data at once!
you need somewhere to host the data (Glitch or GitHub should work fine)

potential drawbacks:

your page will load all of the data at once!
you need somewhere to host the data (Glitch or GitHub should work fine)
you aren't using Carto, so styling and filtering is different

using the open data API

source

an API gives you access to data through a URL

you can often filter this data in the URL (so you load less data)

source

API benefits:

you always get the latest data

API benefits:

you always get the latest data
you don't have to store the data

API potential drawbacks:

your page will still load all of the data it needs to show

API potential drawbacks:

your page will still load all of the data it needs to show
if the server hosting the API goes away or moves, your page breaks

OpenStreetMap has an API you can use

source

"the free wiki map of the world"

source

how's it work?

features are "tagged" with attributes

leisure=park

railway=subway

there are a few ways to figure out how people tag features

1. look at the map

2. look at the wiki

getting data using overpass turbo

source

Advanced GIS

work session next week (4/21)

work session next week (4/21)

project presentations 4/28, 5/5

presentations

presentations

around 10 minutes, a few minutes for Q&A

presentations

presentations

presentations

presentations

presentations

at some point you might want to start programming on your own computer

(you don't have to for this class)

a typical process is:

1. edit the code in a code editor

2. test code in your browser

3. put code online with GitHub

code editors:

keep each project in a folder

the easiest way to put this in GitHub is dragging and dropping

make sure you select all of the contents of the project folder

you don't have to use GitHub to host a site

it's often hard to put your own HTML pages on Wordpress or Squarespace

you might consider hosting a map on Glitch or GitHub, and include the map in another site using an <iframe>

leaflet plugins

look through the list of Leaflet plugins and find one or two that are interesting

you can get google streetview imagery for a latitude and longitude

all you need is latitude, longitude, and ...

an API key from google (requires a credit card)

more info in the docs

you don't have to use Carto for this part

you can get your overlay data from other sources

if you have a GeoJSON, you can load that directly with Leaflet

potential drawbacks:

potential drawbacks:

potential drawbacks:

using the open data API

an API gives you access to data through a URL

you can often filter this data in the URL (so you load less data)

API benefits:

API benefits:

API potential drawbacks:

API potential drawbacks:

OpenStreetMap has an API you can use

"the free wiki map of the world"

how's it work?

features are "tagged" with attributes

leisure=park

railway=subway

there are a few ways to figure out how people tag features

1. look at the map

2. look at the wiki

getting data using overpass turbo

remix this Glitch and try searching for something else using OpenStreetMap and Overpass

you might consider hosting a map on Glitch or GitHub, and include the map in another site using an `<iframe>`