Maps and the Geospatial Revolution: Lesson 2, Lecture 2
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Transcript of Maps and the Geospatial Revolution: Lesson 2, Lecture 2
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Maps and the Geospatial Revolution
Lesson 2 – Lecture 2
Anthony C. Robinson, Ph.D Lead Faculty for Online Geospatial Education John A. Dutton e-Education Institute Assistant Director, GeoVISTA Center Department of Geography The Pennsylvania State University
This content is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License
![Page 2: Maps and the Geospatial Revolution: Lesson 2, Lecture 2](https://reader033.fdocuments.in/reader033/viewer/2022052905/55844676d8b42af85e8b46f2/html5/thumbnails/2.jpg)
Spatial Relationships
• You need some ground rules to establish what is possible when it comes to spatial relationships
• Spatial Topology
– The set of relationships that spatial features can have with one another
• Let’s consider how people relate to each other in
space
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Spatial Relationships
• Equals – When we first met each
other, we felt like we were “one.”
• Touches
– Our first kiss was gentle – no tongue.
• Overlaps
– During our honeymoon we… <deleted>
• Contains
– For 9 months the baby was inside (and much quieter).
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Spatial Relationships
• Disjoint
– Later on, we got sick of each other and watched TV from opposite sides of the room.
• Covers
– The dog sleeps on top of me, creating a huge amount of heat.
• Crosses
– Although we both know how to find our way home from the grocery store, the only routing point we have in common is our driveway.
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Spatial Relationships
• What would happen if we ignored them?
– Things like Mapquest and Google Maps would never be able to do anything useful
• For example
– Consider 500 road segments that encompass
your neighborhood and nearby region
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Scale
• Two key concepts of scale are used in Geography
• Map scale
– Ratio of the distance on the map to the real distance on the Earth
– Large scale = 1/1000 Small scale = 1/10,000,000
• Scale of analysis
– The specific geographic context used to understand a problem
– Neighborhood, County, State, Country, Continent
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What About Time?
• Spatial Relationships and Scale are really important, but what would they mean without considering Time?
• Almost everything Geographic involves a dynamic process of one type or another
• Maps often make it hard to see time as an explicit factor
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What About Time?
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What About Time?
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What About Time?
Part of the image is from 2012 from one sensor, and the other part is from 2013 from another sensor.
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Maps and the Geospatial Revolution www.coursera.org/course/maps Twitter @MapRevolution Online Geospatial Education @ Penn State www.pennstategis.com
This content is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License