CS 128/ES 228 - Lecture 9a1 Vector* Data Sources * mostly.

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Presentation transcript:

CS 128/ES Lecture 9a1 Vector* Data Sources * mostly

CS 128/ES Lecture 9a2 Georgian’s First Law of GIS Try to use somebody else’s data before you even think of generating your own

CS 128/ES Lecture 9a3 Geographic data portals

CS 128/ES Lecture 9a4 Nat. Geospatial Data Clearinghouse Composed of many federal agency reps. Developing the National Spatial Data Infra- structure Working with Office of Homeland Security

CS 128/ES Lecture 9a5 USGS: National Mapping Info. Primary responsibility for US mapping Mapping standards and metadata Topographic maps GNIS

CS 128/ES Lecture 9a6 US Bureau of the Census Address and population data, tied to the census tract TIGER maps

CS 128/ES Lecture 9a7 NYS GIS Clearinghouse Familiar site? Statewide aerial photographs DOT maps Gateway to many USGS & NYS products

CS 128/ES Lecture 9a8 Academic sites Prominent GIS programs: Cornell U. U. Buffalo U. Calif., Santa Barbara U. Minnesota

CS 128/ES Lecture 9a9 Commercial sites ESRI’s site (nice move, licensing GIS.com!) The GIS portal! ~ 100 GIS links GIS World

CS 128/ES Lecture 9a10 1. Digital Raster graphs (DRGs)  Scanned topographic maps at various scales  Resolution: 400 dpi typical  Projection and coordinate system: varies (read the metadata!)  Accuracy: roughly that of paper source maps  Layers: either 1 or 2. No full GIS capability

CS 128/ES Lecture 9a11 Sources of DRGs Commercial sources (e.g., Delorme, Silva)  1:24,000 or 1:100,000  ~ $100/state  various tools, but one layer

CS 128/ES Lecture 9a12 3-D renderings

CS 128/ES Lecture 9a13 USGS DRGs  1:24,000 or 1:100,000  two layers - features - topography  feature classes can’t be separated

CS 128/ES Lecture 9a14 2. Digital line graphs (DLGs)  Scales 1:24,000 1:100,000 1:2x10 6  Full topological data structure (nodes, lines, areas + adjacency information)  Layers: 9 feature classes, street & address information, elevations  Projection: UTM (large & medium scale), Albers Conical Equal Area (small scale)

CS 128/ES Lecture 9a15 Area features: hybrid topology  Network & area info in same file  All closed line circuits define areas – but not all areas have cartographic identities  Hydrology ex: lakes and streams

CS 128/ES Lecture 9a16 Tributaries are single lines Two Mile Creek near campus

CS 128/ES Lecture 9a17 Rivers are made of 2 lines Allegheny River near campus

CS 128/ES Lecture 9a18 Major attribute codes

CS 128/ES Lecture 9a19 Minor attribute codes

CS 128/ES Lecture 9a20 Olean DLG: roads (4 layers)

CS 128/ES Lecture 9a21 Olean DLG: add water features

CS 128/ES Lecture 9a22 Olean DLG: add contours

CS 128/ES Lecture 9a23 Olean DLG: all layers

CS 128/ES Lecture 9a24 3. TIGER maps U. S. Census Bureau’s DLG format Include county, census tract, & census block De facto standard/source for most commercial geocoding and trip planning software Topologically Integrated Geographic Encoding & Referencing system

CS 128/ES Lecture 9a25 The TIGER map browser

CS 128/ES Lecture 9a26 Center on a familiar point…

CS 128/ES Lecture 9a27 TIGER for Allegany NY

CS 128/ES Lecture 9a28 Census Bureau databases American Factfinder Reports in table or map form Joins or relates?

CS 128/ES Lecture 9a29 Thematic maps

CS 128/ES Lecture 9a30 Resolution to the census tract

CS 128/ES Lecture 9a31 Local demographic stats

CS 128/ES Lecture 9a32 Summary: digital data sources  Digital raster graphs (DRGs)  Digital line graphs (DLGs)  TIGER files