MIT GIS Lab website:

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Introduction to ArcGIS

• MIT GIS Lab website
• http//libraries.mit.edu/gis
• Email
• gishelp_at_mit.edu

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ETM Spectral Bands (Band 6 Thermal)
6,5,4
3,2,1

• Mt. Etna, Sicily, Italy Bands 321 and 654.
• Here Band 6 is Red, Band 5 is Green, Band 4 is
  Blue.
• Notice how the thermal band 6 does not pick up
  the smoke, or the clouds.
• You can see where the hot lava flows underground
  in lava tubes.
• The hotter the signal the brighter the pixel.

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Digital Elevation Model (DEM)
Raster file a sampled array of elevations for a
number of ground positions at regularly spaced
intervals
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Cape Town, South AfricaLandsat Image over SRTM
DEM
http//photojournal.jpl.nasa.gov/jpegMod/PIA04961_
modest.jpg
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A computer system to digitally represent
geographic objects in a variety of
shapes.(Spatial Attributes)
Polygons
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A computer system to digitally represent
geographic objects in a variety of
shapes.(Spatial Attributes)
Polygons
Lines
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A computer system to digitally represent
geographic objects in a variety of
shapes.(Spatial Attributes)
Polygons
Lines
Points
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A computer system to digitally represent
geographic objects in a variety of
shapes.(Spatial Attributes)
Polygons
Lines
Points
Images (Pixels)
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Spatial attributes have a database backend that
can be used for querying and analysis.
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Each spatial attribute is referenced in a
projection and a coordinate system.
29o 43 7.10 N 95o 23 55.74 W GCS_WGS_1984
1/2m Aerial Photo
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Each spatial attribute is referenced in a
projection and a coordinate system.
29o 43 7.10 N 95o 23 55.74 W GCS_WGS_1984
Sidewalks
1/2m Aerial Photo
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Each spatial attribute is referenced in a
projection and a coordinate system.
Buildings
29o 43 7.10 N 95o 23 55.74 W GCS_WGS_1984
Sidewalks
1/2m Aerial Photo
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Each spatial attribute is referenced in a
projection and a coordinate system.
Streets
Buildings
29o 43 7.10 N 95o 23 55.74 W GCS_WGS_1984
Sidewalks
1/2m Aerial Photo
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Map projections

• There are many different map projections. All
  map projections distort
• shape
• area
• distance
• or
• direction

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The Mercator projection maintains shape and
direction. The Sinusoidal and Peters projections
both maintain area, but look quite different from
each other. The Robinson projection does not
enforce any specific properties but is widely
used
because it makes the earths surface and its
features "look right."
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Three Different Map Projections from The
Geographers Craft, Map Projections webpage
http//www.colorado.edu/geography/gcraft/notes/map
proj/mapproj_f.html
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Data from different sources, covering the same
area, can look very different. Evaluate scale,
accuracy and file size when selecting data for a
project.
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Different data types

• Tabular (databases)
• Join with vector file by common attribute
• Mapped as points using coordinate points such as
  latitude and longitude gathered from a GPS
• Geocode associate address field with street file
• Vector
• Points, lines, polygons

• Raster
• A raster is a model of the world as a surface
  that is divided into a regular grid of cells,
  arranged into rows and columns. All cells must
  be the same size.
• images (such as aerial photographs)
• grids (derived data representing continuous
  values such as an elevation surface or categories
  such as vegetation types)

Geodatabases CAD
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Where to Get GIS Data

• 1. MIT Geodata Repository bring data directly
  into your project over the network. more info at
  http//libraries.mit.edu/gis/data/repository.html
• 2. MIT GIS Lab
• Use Barton to search the collection of data on
  CDs and DVDs
• http//library.mit.edu/F/?funcfilefile_namebrow
  se-limit
• 3. Internet
• http//libraries.mit.edu/gis/data/
• 4. Create your own
• GPS, Digitize, etc.
• Not finding what you want?
• Contact gishelp_at_mit.edu
• Data purchase requests

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GeoWeb
Coming Soon!!! A web interface to search, view,
and download data and view metadata from the
MIT Geodata Repository, an international
collection of GIS data, maintained by
MIT GIS Services.
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Social Science Data Services
Offers assistance with finding social science
data, such as
and statistical software and methodology
consultations. http//libraries.mit.edu/guides/s
ubjects/data/
- Available in Dewey Library
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Collect your own data
Global Positioning Systems (GPS) are available
for checkout from the Rotch Library Circulation
desk
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ArcScene
Work in 3D
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ArcCatalog

• Manage Files and folders
• Create new shapefiles and geodatabases
• Preview files
• View metadata in format of choice
• create metadata so your data can be understood
  and shared with others
• Save metadata files as .xml, .txt., .html or
  .sgml

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ArcGlobe

• View the world as a globe
• 3D effects
• Animated fly- throughs

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Model Builder
Automate save procedures
Insert an image of your model into a report to
explain the processing of your data
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Extensions to ArcGIS ArcGIS 3D Analyst ArcGIS
Geostatistical Analyst ArcGIS Network
Analyst ArcGIS Spatial Analyst http//www.esri.co
m/software/arcgis/about/desktop_extensions.html
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Contact information

• MIT GIS Lab website
• http//libraries.mit.edu/gis
• Email
• gishelp_at_mit.edu