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Geographic Data Primitives

Geographic Data Primitives. Large number: Points, multiipoints, lines, polylines, splines, rasters, images, surfaces, networks…. But, 95% of the time we deal with these five:. RESIN GIS Workshop #1, November 6, 2009, John Radke, Howard Foster. GIS data primitives, cont. The standard five:

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Geographic Data Primitives

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  1. Geographic Data Primitives Large number: Points, multiipoints, lines, polylines, splines, rasters, images, surfaces, networks…. But, 95% of the time we deal with these five: RESIN GIS Workshop #1, November 6, 2009, John Radke, Howard Foster

  2. GIS data primitives, cont. The standard five: Points Lines (aka “arcs”)

  3. Geo-primitives, cont. Polygons Rasters Images (many image formats)

  4. Geo-primitives, the big idea That almost all of these primitives can be linked to attribute information via an unique identfier imbedded within each object. 2102

  5. Attributes of geo-primitves 2102

  6. Levee segment data (many names) example

  7. GIS display controls Render: color, transparency, line style, symbol style, color gradients,… Render simply or by attribute characteristic Attributes can be selected (e.g., “fact” < 3) for further control over data display (ArcMap only) Draw order can be changed, layers turned off and on. Masking, labeling, etc. Backdrop imagery

  8. RESIN GIS data service design Core RDBMSPostgres/PostGIS Filesystem(shapefiles,jpegs, etc) SQL SQL Metadata BrowserWeb Browser Web server technologiesGoogle Maps MapserverOpenlayersCalmap ESRISpatial Data Engine(SDE) Clients WorkstationArcgis Arc Explorer GISC MapView Web browser

  9. ArcGIS Explorer .net Only runs on Windows machines Attempts to out-Google Earth with on-line connection to good backdrop imagery Supports all major ESRI GIS data types, including real-time data (SDE), supports real-time reprojection so you can use data from different sources.

  10. .net Arc Explorer cont. The good: Supports annotations. Backdrop imagery is high quality and fast at the desktop. The bad: Doesn’t (yet?) support display-by-attribute (clumsy work-around exists.) Poor quality with some raster data Does not datum shift (also java version too).

  11. .net Arc Explorer cont. You must use local data (files on disk) when in the field. You must set the display to 2D mode. You must understand the difference between layers and shapefiles and the different ways you access them.

  12. .net Arc Explorer Resources: http://calmap.gisc.berkeley.edu/resin_gis You will see software download directories, help documents, data interfaces, etc.

  13. Demo: Access files from a local directory: C:/temp/resin/data_mix Start up Arc Explorer, switch to 2D mode Pre-defined layer list is infrastructure_setup.nmf

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