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Unit Five: Layer Files

Unit Five: Layer Files. Review Storing “Instructions” In Map Document In Layer Files Using Layer Files Intro to Data Storage Types. In this unit…. ArcMAP. Review. ArcMap as a Virtual Environment.

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Unit Five: Layer Files

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  1. Unit Five: Layer Files Review Storing “Instructions” In Map Document In Layer Files Using Layer Files Intro to Data Storage Types In this unit…

  2. ArcMAP Review ArcMap as a Virtual Environment Instructions about the way the data looks or is re-defined (layer properties) are stored in the Map Document only Changes the way data look here... We need a another means to retain decisions we made about the appearance of the data, • To re-use in separate map documents on our own PC • To give to others to use in their own map documents Those changes are NOT stored with the data!

  3. Storing Instructions: Map Documents • Save the work, and it’s… • Stored in the Map Document Sample.mxd as “instructions” about how to arrange the data • Stored in a proprietary, binary file format readable and editable with ArcGIS • NOT “backward compatible” with AV 3.x “projects”.

  4. Storing Instructions: Map Documents • New map documents showing the same feature data as Sample.mxd: • The symbology is chosen by ArcMap from defaults. • The viewing preferences set in Sample.mxd are unknown to Untitled.mxd

  5. Storing Instructions: Layer Files • ArcGIS has methods for sharing information between Map Documents. • The Layer File: • Saves instructions (Layer Properties) contained in Sample.mxd into a separate file • Legends • Query Definitions • Joins (?!) • Shows the file as “data” when added to new Map Documents (even though it really includes only a “pointer” to existing data)

  6. clik! Using Layer Files To save a Layer File • Layer file actions are in the Layer context menu. • Select the save option • Enter a new name for the layer. ALWAYS use default file extensions offered by ArcGIS - in this case, “.lyr”

  7. Using Layer Files To Add a Layer File The Layer file may now be treated as if it were any other GIS data source… add a new layer and select the layer file “crashrate00” looks just like the other Map AND … Comes with all other property settings! Note the use of different icons to distinguish between the original data file and the new layer file

  8. Using Layer Files To Import Layer File Symbology • Layer properties • Symbology Tab • Import button • Select Layer File and Value Field Includes ONLY symbology – no other properties

  9. Arc/Info Coverages Shapefiles Layers Line Polygon Point Raster Table Data Storage Types yellow green pale yellow Geodatabase

  10. Layer Files Exercises: Complete the exercises for this unit.

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