CHUG_presentation_Hope

TRI-COUNTY HEALTH DEPARTMENT
Google Maps Internet Mapping Tools
The TCHD “Sniffer”
CHUG, May 7th, 2009
Hope Dalton, Water Specialist
Lara Juliusson, GIS Coordinator
Jeff McCarron, Environmental Health Specialist II

Presentation Outline
• Environmental Health Inspectors
Territories Project
– Jeff McCarron
• Specialized Uses
– Hope Dalton
• Google Maps Application Programming
Interface & Data Integration
– Lara Juliusson

Environmental Health Inspectors
Territories Project
• Assigning Complaints to Appropriate
Environmental Health Inspector
• After Hours Response Team
• Verification of Establishment Locations
• Point Map Generation
• Site Development and Maintenance

Assigning Environmental Complaints

Verification of Establishment Locations

Point Map Generation
Table of
Addresses in
Excel

Specialized Uses
• Spill and Drainage Identification
• Drinking Water Protection
• Land Use Reviews
• Leachfield (ISDS Absorption Area)
Complaints

Spill and Drainage Identification
Cross Connection Site
Spill into Stormwater
Drainage
Cross Connection SiteSpill into
Stormwater
Drainage

Spill Drainage Identification
Elementary School
Park
Lil’ Dry Creek
Spill Site

Drinking Water Protection
Drinking Water Source
Drinking Water Source

Leachfield Protection
Leachfield
Parking

Unknown Photo Dates
Fall/Winter
Spring/Summer

Google Maps Application Programming
Interface & Data Integration
• Google Maps Overview
• Google Maps API
• Custom Data for Google Maps
• Converting GIS to KML / Image
Overlays
• Summary

Google Maps
• A web mapping service application and
technology provided by Google

Google Maps
• A web mapping service application and
technology provided by Google
• Google Maps includes:
– Street maps from TeleAtlas
– Geocoding service using TeleAtlas data
– High-resolution satellite images (< ~1:34,000)
and aerial photos (> ~1:34,000)
– StreetView service
– Plug-in for live traffic information

Google Maps API
• Google Maps Application Programming Interface
(API) – JavaScript, HTML

Google Maps API
START OF GOOGLE MAPS WEB PAGE HTML CODE
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-
microsoft-com:vml">
<head>
<link rel="stylesheet" type="text/css" href="gmap.css" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps</title>
<script
src="http://maps.google.com/maps?file=api&v=2&key=ABQI
AAAAXmHFSoyloculk3L9DqxjtRQmJvD_48Ovm0AfFvsPq1nL1GlxnhQ
k6hwb3Vs2BU0DdyB1KkKSmAQwmg" type="text/javascript"></script>
…….

Google Maps API
• Get a key from:
http://code.google.com/apis/maps/signup.html
START OF GOOGLE MAPS WEB PAGE HTML CODE
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-
microsoft-com:vml">
<head>
<link rel="stylesheet" type="text/css" href="gmap.css" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps</title>
<script
src="http://maps.google.com/maps?file=api&v=2&key=ABQI
AAAAXmHFSoyloculk3L9DqxjtRQmJvD_48Ovm0AfFvsPq1nL1GlxnhQ
k6hwb3Vs2BU0DdyB1KkKSmAQwmg" type="text/javascript"></script>
…….

Google Maps API
• Get a key from:
• Free, but…

Google Maps API
• Get a key from:
• Free, but…
• Terms of Service agreement (TOS):
– No-charge websites
– Requires “public facing” website, ISP
– Do not obscure the Google Logo
– Limited to 15,000 geocode requests per day
– Google may include advertising in the future

Google Maps API
• Get a key from:
• Free, but…
• Terms of Service agreement (TOS):
– No-charge websites
– Requires “public facing” website, ISP
– Do not obscure the Google Logo
– Limited to 15,000 geocode requests per day
– Google may include advertising in the future
• Commercial version: Premier Maps API, starts at
$10,000 per year.

• Types: Feature-based & Image-based
– Feature-based: points, lines, and polygons
– Contains clickable attribute data
Custom Data for Google Maps

1. KML, XML, or GML files

KML or XML or GML
ML = Markup Language
Example of a point feature KML file:
<Placemark>
<name>Hospitals</name>
<description>The Children’s Hospital</description>
<Point><coordinates>-104.082203,39.422289,0</coordinates></Point>
</Placemark>

2. WFS: Web Feature Service, returns XML data

2. WFS: Web Feature Service, returns XML data
Example WFS GetFeature Request to EPA’s “geodata.epa.gov”
http://geodata.epa.gov/wfsconnector/com.esri.wfs.Esrimap/NPL_FS?request=GetFeature
&BBOX=-105.37262,39.119407,-103.697205,40.033924&typeName=Superfund_Sites-
0&propertyname=d_igd.ef_npl.facility_name,d_igd.ef_npl.pgm_sys_acrnm

– Image-based: static image, not clickable,
JPG/PNG/GIF images
– Two types: Tile and Ground Image Overlays
1. Tile overlays: Sets of tiles for different zoom levels
Zoom level 0 = one tile for all of earth

JPG/PNG/GIF images
Zoom level 1 = four tiles for all of
earth (images increasing in detail)

JPG/PNG/GIF images
Zoom level 1 = four tiles for all of
earth (images increasing in detail)
Zoom level 2 = 16 tiles
Etc…

2. Ground Image Overlays

2. Ground Image Overlays
– WMS: Web Map Service
Example of WMS for Topos:
http://terraservice.net/ogcmap.ashx?

Converting GIS Files to KML
or Image Overlays
Type: KML
Name How is it used Benefits Drawbacks Where to get it
shp2kml 2.0 from
Zonums
Download and install,
use menus and GUIs to
convert a shapefile to a
KML file
Easy to use,
Provides many
formating options,
including multiple
attribute fields in
information
bubble. Can
create graduated
color/size point
output.
Outputs lat/longs
with greater than
6-decimal
places, so large
shapefiles may
be too large to
use as KML http://www.zonums.com/shp2kml.html
GPS Visualizer
Use online to create
Google maps or KMLs
from GPS data (tracks
and waypoints,
including GPX files),
street addresses, or
simple coordinates.
Easy to use, with
lots of formatting
options. Creates
Google Map code
that you can save
and use on your
webpage, or just
create a KML file.
Can create
graduated
color/size point
output.
Does not create
Polygon KML
files http://www.gpsvisualizer.com/
ArcGIS Desktop,
ArcTools
Use in ArcGIS to export
KMLs from GIS Layer
files. The formatting
derives from the layer
formatting
Easy to use. Can
output an entire
map document.
Includes scale
dependency
setting
Limited in
formatting
options to
showing one
attribute ArcToolbox > Conversion Tools > To KML
ArcScripts Code
The ESRI website
Arcscripts database has
~20 scripts for
conversion between
GIS files and KML
You might find one
that does exactly
what you want, or
that you can
modify easily
Custom tailored
to specific
applications http://arcscripts.esri.com/
Write your own
Converter
Use VB or other
programming language
to convert between GIS
files and KML
Can be
customized to do
exactly what you
want, make
modifications to
field names on the
fly, etc.
Could be difficult
depending on
complexity
required
Probably many other
on the web…

Converting GIS Files to KML
or Image Overlays
Type: Image
Name How is it used Benefits Drawbacks Where to get it
GPS Visualizer
Use online to create
georeferenced Images
(JPG/PNG) from GPS
data (tracks and
waypoints, including
GPX files), street
addresses, or simple
coordinates.
Easy to use, with
lots of formatting
options. Creates
images showing
your data on one
of many map
background
choices. Save and
use on your site.
Does not create
tiled output for
multiple zooms. http://www.gpsvisualizer.com/
GMapCreator
Download and install.
Select a shapefile, and
numeric attribute field to
create shaded color
tiled image output. Set
range of zoom levels to
control output size.
Easy to use.
Creates a Google
Maps website that
you can save the
code from and
load on your site.
Creates a color
legend for the
data. Also creates
image tiles named
for use in Google
Maps.
Formatting
options are
somewhat
limited. No way
to label features
on the images. http://www.casa.ucl.ac.uk/software/gmapcreator.asp
Some Catalogs of WFS and WMS Services:
http://www.ogc-services.net/
http://www.sourcepole.com/2006/9/1/wms-map-server-list
http://pugetsound.epageo.org/index.php5?title=Catalog_of_Web_Services

Putting it all Together
• Get your Google Maps API key:

• Examples:
http://code.google.com/apis/maps/documentation
/examples/index.html

• Examples:
• Great tutorials:
http://econym.googlepages.com/index.htm

• Examples:
• Great tutorials:
http://econym.googlepages.com/index.htm
• Great developer’s group:
http://groups.google.com/group/Google-Maps-
API

The End
Questions?
Contact: Lara: ljuliuss@tchd.org
Acknowledgements:
Lance Dias: Gmaps programmer extraordinaire

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