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By Jim Graham May, 2008 1. 2. 3. How GoogleEarth Works Display Excel Data in GoogleEarth Creating KML Files for GoogleEarth Web Server Local Computer Internet Satellite Images Spreadsheet Files GoogleEarth KML Files Created by Denver-based company, Keyhole An application that runs on your computer GIS Services for various layers A system that you can add data to Commercially owned Common file formats: ◦ Word (*.doc) ◦ PowerPoint (*.ppt) ◦ Excel (*.xls) Shapefiles Coverages GeoTIFF Lots of others Is KML a GIS format? Small Graphics Markup Language (SGML) HyperText Markup Language (HTML) Extensible Markup Language (XML) Based on XML Very simple, flexible format Can be create very complex files Not an industry standard (could change at any time, only works in GoogleEarth) KML Documentation: Or search on ‘KML’ into Google http://code.google.com/apis/kml/docu mentation/ Rasters (photos) ◦ Satellite ◦ Aerial Vector Data ◦ Points ◦ Polylines/Paths ◦ Polygons Add Placemark Add Path to and from somewhere Add Polygon around your school Save As… KML files KML is still very new Shapefiles are the most common GIS vector format Converters are coming Shapefiles are much more limited than KML files (i.e. it’s easy to go from Shapefile to KML, can be harder to go from KML to Shapefile) When should data be in a local file vs. on a web server? What are the possible futures for KML? Web Server Local Computer Internet Problem: Display spreadsheet data in GoogleEarth Solution: ◦ Use an Excel “Add-In” that converts data in spreadsheets to a KML file ◦ Open the KML file in GoogleEarth Actually Excel files that include “Macros” Hidden in your “Add-In” folder 1. 2. 3. 4. 5. Install WriteToKML Add-In to your system Make WriteToKML available to Excel Add a custom tool to Excel Use the tool to save a KML file Make more interesting descriptions Discussion point: What type of data would you collect to make this work? The WriteToKML Add-In is limited Does not support: ◦ ◦ ◦ ◦ polygons and paths Graphics Icons Lots of other features of KML http://earth.google.com/kml/index.html Simple text files without any formatting Write in NotePad (TextEdit on the Mac), not MS-Word or other “word-processor” 1. 2. 3. 4. 5. 6. Search on “KML” in Google Click on “KML Documentation Introduction” Click on “KML Tutorial” Scroll down to light blue boxes Copy everything in the box into a new NotePad file Save as “text.kml” What is the approximate coordinate? What is the name? What is the description? Open GoogleEarth and Notepad Steps: ◦ ◦ ◦ ◦ ◦ Edit in NotePad Save to a file on the desktop Double click on the file Click “Yes” to reload and view the file Repeat Change name, description <?xml version="1.0" encoding="UTF-8"?> <kml xmlns="http://earth.google.com/kml/2.2"> <Document> <Placemark> <name>Name of the Placemark</name> <description> Description appears in the balloon </description> <Point> <coordinates>102.595626,14.996729</coordinates> </Point> </Placemark> </Document> </kml> Multiple points ◦ Add “Document” tags” ◦ Add another point, save, view Some fun stuff - Photos, paths, etc. KML “Developer’s Guide” KML Reference How would you use this in your classroom? What types of data would kids find cool to put into GoogleEarth? Web server/client architecture Spatial Data File format: KML Converting from Excel to KML How to edit KML files