Class Notes – May 5, 2010

May 5th, 2010 by Matthew K. Gold Leave a reply »

Guest Speaker: Steven Romalewski, Director, CUNY Mapping Service

Data linked to specific points on the earth’s service — enables analysis based on

proximity, where info is in relation to other characteristics

Concept of layers – organizing data with like features together – can query across layers –

how many subway stations are located within census tracts that meet certain specifications.

Portable GIS – GIS on a stick

when you open GIS package, it’s a blank slate — you have to bring data to it

up to you to know how to symbolize data
have to know how to get data to integrate into map
need info on projection and coordinate systems — need to make sure that things line up – how to project 3d object onto 2d service – thousands of mathematical concepts –

GIS grad course at Pratt — 15 week course – lot of drudgery to get to point where you can make maps that aren’t misleading

geographic data
attribute data

BIN – building identification number — from Bloomberg effort to make data more accessible

— but you stil

gdb geo database format


shp – shape file format

Google – bought Keyhole
— google earth — keyhole project
now trivial to access aerial info and display on maps

Web services

— will line up with other data systems

vector data vs. raster data

Maker — map data easily

— rely on web services and user reports

Open Street Map — another application —

Haiti relief efforts – people using GIS

Vintage – will data be updated as roads change, new buildings are built?

Open Geo – business model – take open-source

Mapping off of the grid
one power of GIS is that it is based in physical geography — can abstract that to some extent . . . problems –

Modifiable Aerial Unit Problem – MAUP

How to Lie With Maps
— all maps lie; you have to make them lie as little as possible

Steve R’s
Absolute rule – never use default color schemes, etc. – always customize

Choropleth map — using gradations of color to represent gradations in your data

Need not only to understand data but how to represent data

— Need to understand your metadata –

find out what agency has regulatory authority over your subject and they will probably have data

Cynthia Brewer
Designing With Maps

Manahatta Project

NYPL Map Rectifier

CUNY Mapping Service

Census Hard to Count 2010

You Are Here: Personal Geographies and Other Maps of the Imagination

CUNY Mapping Service
CUNY Data Service
NYC Labor Market Information Service


1 comment

  1. Matt says:

    Decided to make this public. Why not?

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