Becker- Week 5

Chapter 4

  • database- container for the data of an organization, project, or other undertaking for record keeping, decision-making, analysis, or research
    • geodatabase is Esri’s database for geospatial data

Tutorial 4-1

  • software automatically creates geodatabase when you start an ArcGIS project
  • can connect to other folders for easy access
  • shapefile- spatial data format for a single point, line, or polygon layer

Tutorial 4-2

  • much of what is displayed by GIS depends on attributes- columns of data in tables
  • you can download data from external sources (ex: US Census Bureau) to map
  • added a column to Tracts attribute table

Tutorial 4-3

  • GIS links tabular data to spatial features in feature classes
  • SQL criterion: attribute name <logical operator> attribute value

Tutorial 4-4

  • count burglaries by neighborhood
  • created choropleth map based on the join count I added

Tutorial 4-5

  • GIS creates central points when you use graduated colors for symbology for polygon layer
  • created fields to find coordinates of central points
  • Feature to Point calculates central points instead of centroids

Tutorial 4-6

  • creating code table and necessary fields/data

Chapter 5

  • learn about latitude and longitude coordinates and their geographic coordinate system
  • map projections- making flat maps from the nearly spherical earth

Tutorial 5-1

  • Longitude: 0-180 east to west
  • Latitude: 0-90 north to south
  • 100+ map projection in GIS
  • graticule- networks of lines on the map (30-degree intervals east-west and north-south)
  • changed map shape

Tutorial 5-2

  • working with US map projections
  • Albers equal-area standard projection for US Geographical Survey (USGS) and US Census Bureau for US maps
  • larger part of world you need the more distortion

Tutorial 5-3

  • Foe medium/large scale maps use localized projected coordinate systems specific to the study area
  • need to use a reference map to determine what zone you are in to apply the correct coordinate systems
  • adding layer adopted new coordinate system to the map

Tutorial 5-4

  • review file formats for vector spatial data
  • GPS and many other databases provide coordinates with x,y values
  • KML is the file format used to display geographic data in many mapping applications (international standard for Open Geospatials Consortium)

Tutorial 5-5

  • use data from US Census Bureau
  • learned how to clean up data in Excel
  • trying to export files into the ArcGIS crashed my computer and I had to restart it and couldn’t finish the tutorial

Tutorial 5-6

  • rasters are large files and should probable be stored elsewhere
  • Bicycle Count Stations wasn’t there where it said it would be

Chapter 6

  • geoprocessing- framework and set of tools for processing geographic data

Tutorial 6-1

Tutorial 6-2

  • workflow for creating study region from layers that have more features than needed
  • created feature class from selected features

Tutorial 6-3

  • merging water features into a new single layer

Tutorial 6-4

  • use Append tool to add features to an existing feature class
  • Added FireHouses and PoliceStations to the attribute table

Tutorial 6-5

  • intersecting features to determine streets in company fire zones

Tutorial 6-6

  • Union tool overlays geometry and attributes of two input polygon layers to generate a new output layer

Tutorial 6-7

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