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Sources of GIS Data . Definition:. What is data? Data is anything in the form of Charts Tables Text Maps Photos Imageries, etc. . Examples of data. Data vs. Information. Data are collection of facts Data are observed/recorded It simply exists and does not have meaning of itself.

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Presentation Transcript
slide1

Sources

of GIS Data

definition
Definition:
  • What is data?
  • Data is anything in the form of
  • Charts
  • Tables
  • Text
  • Maps
  • Photos
  • Imageries, etc.
data vs information
Data vs. Information
  • Data are collection of facts
  • Data are observed/recorded
  • It simply exists and does not have meaning of itself
  • Information is obtained when the data is summarized/analyzed and the result is put into a meaningful context
data vs information1
Data vs. Information

Information

Data

beyond data information

Wisdom

Knowledge

Information

Data

Beyond Data & Information
sources of gis data
Sources of GIS data
  • Existing Maps (analog & digital)
  • Remotely sensed data
  • a. Photographs
  • b. Satellite Imagery
  • c. Lidar
  • 3. Field observation
  • a. Survey / Sampling
  • b. GPS data
most of the gis data are now available online from respective state gis data clearing house

In NH (GRANIT):

www.granit.sr.unh.edu

In MA (MASS GIS): www.mass.gov/mgis/

In VA (VGIS): www.vcgi.org

In NY:

www.gis.ny.gov

Most of the GIS data are now available online from respective State GIS data clearing house
data format
Data format
  • Most of the vector GIS data are in
  • Shapefile (ArcView 3.x)
  • ArcInfo interchange file (.e00)

You have to use Import function in ArcGIS

to make an ArcInfo interchange file usable!

data format1
Data format
  • We will be using Geodatabase in this class
  • Shapefiles can be exported to a feature class in a Geodatabase
slide13

Advantage of Geodatabase

Feature class provides updated length of line feature

You can easily get the total length of Roads in NY!

advantage of geodatabase
Advantage of Geodatabase

Feature class provides updated area & perimeter of each polygon in a Geodatabase

what about area in a shape file
What about area in a shape file?
  • Shape file does not update the area of a polygon in the output layer
  • You have to manually update it!