GIS3043_Lecture_10 - GIS3043C GISforEnvironmentalStudies...

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GIS3043C GIS for Environmental Studies Fall 2010 Michael J. Gilbrook, GISP, AICP Frank Salmon, GISP Lecture 10 Data Capture & Tabular Attributes
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Before Class Starts… Start ArcGIS Explorer Fall 2010 Lecture #10 Slide Number 2
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Outline of Lecture #10 Data Capture Process Data Sources Digitizing Overhead Imagery Tabular Attributes Capturing tabular attributes Attribute classification schemes Data Quality Internet Sources of GIS Data Fall 2010 Lecture #10 Slide Number 3
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Fall 2010 Lecture #10 Slide Number 4 Data Capture Process Set Data Capture  Specifications Positional accuracy Attribute accuracy Temporal accuracy Logical consistency Data completeness Determine Goals of Data  Capture Effort  Needs Costs Accessibility Time Frame
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Fall 2010 Lecture #10 Slide Number 5 Data Capture Process Metadata (FGDC, or Other) Purpose Usage  Lineage Specifications Projection Attribute coding Resolution Date Data Capture (“Production”)  Capture features (lines, points,  polygons, rasters, etc.) Assign attributes to features Quality Evaluation Verify accuracy of locations,  attributes Identify & correct logical  consistency (topology) errors
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Fall 2010 Lecture #10 Slide Number 6 Data Collection Cost Issues Cost is High Up to 80%  of any GIS  system or project Incurred early, GIS is  useless without data Quality = $$ Cost escalates with  increasing accuracy   (position, attribute) Cost escalates with  increasing frequency  of data collection
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Data Sources & Capture Methods Fall 2010 Lecture #10 Slide Number 7 DIGITIZING SCANNING REMOTE SENSING COMPUTED COORDINATES Hardcopy Maps Survey Total Station GPS Address Geocoding Aerial Photos Satellite Imagery Radar or Lidar Raster Vector
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Fall 2010 Lecture #10 Slide Number 8 Computed Coordinates - Survey Survey “Total Station” Survey Grade GPS Map from survey data
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Fall 2010 Lecture #10 Slide Number 9 Computed Coordinates - Gecoding Geocoding uses various  methods of relating an  address to an x,y location  on the Earth.  Addresses  may take the form of a  street addresses on a  roadway network, a postal  code, or a grid coordinate.
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Fall 2010 Lecture #10 Slide Number 10 Hardcopy Manuscripts Paper maps may be digitized into GIS.
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Fall 2010 Lecture #10 Slide Number 11 Hardcopy Manuscripts USGS Quad maps often serve as manuscripts.
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Fall 2010 Lecture #10 Slide Number 12 Digitizing – Two Kinds Tablet Trace manuscript on  electronic tablet Use special mouse  (“puck”)  Refer to monitor at  the side as you work “Heads Up” Trace over on-screen  imagery using  mouse Watch monitor in  front of you Digitizing source is  aerial image or  scanned manuscript Cursor or Cross-hairs “Puck”
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Fall 2010 Lecture #10 Slide Number 13 Data Sources for Digitizing Overhead Imagery Sources Aerial photography
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GIS3043_Lecture_10 - GIS3043C GISforEnvironmentalStudies...

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