Why NOT Google? (County GIS versus Google) Laurie J. Kurilla County Geographic Information Officer

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1 Why NOT Google? (County GIS versus Google) Laurie J. Kurilla County Geographic Information Officer

2 Disclaimer This is not a Google bashing This is a discussion about Data This is a discussion about business uses of the Data

3 DATA Data quality, data accuracy, integrity Data Information Knowledge Good data Good Information Knowledge

4 WANTED: Good Data (Bad Data Need Not Apply) Property tax assessments Census information Crime scene Tracking pandemic cases Impact of pesticide use Responding to a variety of citizen questions, issues, and needs

5 1 st Rule of Data The first rule when it comes to information found on the Web (and many other places as well): be skeptical. You would not buy a stock, write a check or believe a contentious statement from an unknown source off line -- so bring the same challenging attitude to information found on line. NY Times March 4, 1999 RECOMMENDATION: Know the source The Source isn t Google

6 Issues with Google Data 1. Where s the metadata? Source information Date or origin Data Integrity Positional Accuracy (degree of closeness of measurements of a quantity to its actual (true) value). Precision (reproducibility or repeatability) Completeness Quality Consistency Projection and datum (for spatial data)

7 Issues with Google Data 2. Who s the source? Business data should be acquired from the original source Every one (department/agency) in the organization should use the same source for the same data

8 LAPD Crime Maps uses Google L.A. Times April 5, 2009 Highest crime rate in L.A.? No, just an LAPD map glitch By Ben Welsh and Doug Smith For 3 years, LAPD incorrectly mapped crimes (1,380 crimes per six months) at wrong location and made visible to public. LAPD considers their mapping system a crime fighting tool Of serious concern is the danger of spreading the bad data to other databases and systems

9 County GIS Test 76 data points across Ventura County Urban, suburban, and rural Ground-truthed Geocoded with County GIS Master Address Database County Centerline Google Microsoft (formerly Virtual Earth)

10 Geocoding Results Microsoft is not worth considering 2 (3%) located on the structure 13 (17%) on the parcel 5 (7%) could not be located 58 (76%) were placed 10 to 2000 from the actual location!

11 Geocoding Results continued Google: 49 (64%) placed on structure. 8 (11%) placed on correct parcel, 7 ( 9%) could not be located* 12 (16%) 10 to 6000 from correct location * These were new site development as old as January Google didn t even have the streetnames. Many street names were incorrect in Google maps.

12 Geocoding Results continued County GIS (w/ new Master Address Database): 66 (87%) placed on structure 8 (11%) placed on correct parcel 2 ( 3%) could not be located, one of which could be placed when falling back on Centerline as source.

13 Geocoding SUMMARY Master Address Database alone provides superior results to Google Cascading to Street Centerline when MAD doesn t match, resulting in 99% match rate

14 Results Matrix Address City/Area Zip County Centerline Locator County Address Point Locator GOOGLE MAPS MICROSOFT BING MAPS 5928 Palomar Circle Camarillo Placed 40' from parcel Placed on house Placed on house 40' off from house 1575 Brookhaven Ave Camarillo Placed in front of parcel Placed on house Placed on house Placed in front of parcel 1942 Dunnigan St Camarillo Placed 10' from parcel Placed on house Placed on house Placed on house 11 E. Loop Dr Camarillo Placed in front of parcel Placed on house Placed in front of parcel 900'+ off from house 1359 Cordova St Camarillo Placed in front of parcel Placed on house Placed on house 75' off from house 39 Abrazo Dr Camarillo Placed in front of parcel Placed on house Placed in front of parcel Placed in front of parcel 1490 Calle La Cumbre Camarillo Placed in front of parcel Placed on house Placed on house Placed in front of parcel 126 Ripley St Camarillo Placed in front of parcel Placed on house Placed on house 150' off from house 523 Saratoga St Fillmore Placed - 100' from parcel Placed on house Placed on house 20' off from house 654 Falcon Way Fillmore Placed 50' from parcel Placed on house 200' off from house 50' off from house 231 Casner Way Fillmore Placed 50' from parcel Placed on house Placed on house 65' off from house 156 Sespe Ave Fillmore Placed in front of parcel Placed on house Placed on house 60' off from house 746 A. St Fillmore Placed 70' from parcel Placed on house Placed in front of parcel 25' off from house 548 Kensington Fillmore Placed 80' from parcel Placed on house Placed in front of parcel 120' off from house 887 Bardsdale Ave Fillmore UnPlaced 500' from house 1000'+ off from house 200' off from house Shadyridge Dr Moorpark Placed in front of parcel Placed on house Placed on house 100' off from house Peach Hill Rd Moorpark Placed in front of parcel Placed on house Placed on house 150' off from house Willow Hill Moorpark Placed in front of parcel UnPlaced 10' off from house 10' off from house 3830 Timberridge Moorpark Placed 60' from parcel Placed on house Placed on house 70' off from house 464 Harry St Moorpark Placed in front of parcel Placed on house Placed on house 60' off from house Westmont Dr Moorpark Placed 500' from parcel Placed on house Placed on house Placed in front of parcel 293 Mahoney Ave Oak View Placed in front of parcel Placed on house Placed on house Placed in front of parcel 211 El Camino Dr Ojai Placed in front of parcel Placed on house Placed in front of parcel 200' off from house 857 Tico Rd Ojai Placed in front of parcel Placed on house Placed on house 40' off from house 907 El Centro St Ojai Placed 240' from parcel 400' from house Placed on house Placed in front of parcel 309 Blanche St Ojai Placed 150' from parcel Placed on house Placed on house Placed in front of parcel 1124 Del Prado Ct Ojai Placed 60' from parcel Placed on house Placed on house 150' off from house 4451 Browning Dr Oxnard Placed in front of parcel Placed on house Placed on house Placed in front of parcel 5131 Jefferson Square Oxnard Placed 40' from parcel Placed on house Placed on house Placed in front of parcel 1510 Rivas Ln Oxnard Placed 30' from parcel Placed on house Placed in front of parcel 500' off from house 1310 Los Prietos Ct Oxnard Placed 30' from parcel Placed on house Placed on house 50' off from house 4020 Nice Ct Oxnard Placed in front of parcel Placed on house Placed on house 50' off from house 2230 Greencastle Ln Oxnard Placed 40' from parcel Placed on house Placed on house Placed in front of parcel

15 Results Matrix continued Address City/Area Zip County Centerline Locator County Address Point Locator GOOGLE MAPS MICROSOFT BING MAPS 3337 Ocean Dr. Oxnard Placed 40' from parcel Placed on house Placed on house 4421 Ahoy Ln Oxnard UnPlaced 25' from house 100' off from house 100' off from house 803 Dunes St. Oxnard Placed in front of parcel Placed on house Placed in front of parcel 30' off from house 258 E Clara Port Huenem Placed 120' from parcel Placed on house Placed on house 200' off from house 1032 Mapelwood Way Port Huenem Placed in front of parcel Placed on house Placed in front of parcel 100' off from house 1091 Evergreen Port Huenem Placed in front of parcel Placed on house Placed on house 50' off from house 545 Starboard Ln Port Huenem Placed in front of parcel Placed on house UnPlaced 75' off from house 550 Surfside Port Huenem UnPlaced 100' from house 300'+ off from house 300' off from house 225 Elm St Santa Paula Placed 130' from parcel 10' from house 15' off from house 15' off from house 325 Guiberson ST Santa Paula Placed 100' from parcel Placed on house Placed on house 200' off from house 229 Atmore DRIVE Santa Paula Placed 50' from parcel Placed on house 10' off from house 150' off from house 818 Loma Vista Santa Paula Placed 50' from parcel Placed on house Placed on house 50' off from house 536 Bradley STREET Santa Paula Placed 20' from parcel Placed on house Placed on house 15' off from house 346 S. STECKEL Santa Paula Placed in front of parcel 20' from house Placed on parcel 600' off from house 1680 Royal Ave Simi Valley Placed in front of parcel Placed on house Placed on house 15' off from house 1256 Patricia Simi Valley Placed 175' from parcel Placed on house Placed on house 220' off from house 2798 Goldfield Simi Valley Placed 75' from parcel Placed on house Placed on house 50' off from house 1572 Casarin Ave Simi Valley Placed 35' from parcel Placed on house Placed on house 70' off from house 508 Pinecliff Place Simi Valley Placed in front of parcel Placed on house Placed on house 150' off from house 1192 Acapulco Simi Valley Placed in front of parcel Placed on house Placed on house 50' off from house 2741 Glencoe Ave Simi Valley Placed in front of parcel Placed on house Placed on house 40' off from house 74 W. Harrison Ave Ventura Placed in front of parcel Placed on house Placed on house 30' off from house 7249 Kodiak Ventura Placed 50' from parcel Placed on house Placed on house 85' off from house 162 Dakota DRIVE Ventura Placed in front of parcel Placed on house Placed on house 30' off from house 680 Jasper Ave Ventura Placed in front of parcel Placed on house Placed on house 30' off from house 8 Los Cabos Lane Ventura Placed in front of parcel Placed on house Placed on house 20' off from house 6944 Heron St Ventura Placed in front of parcel Placed on house Placed on house Placed in front of parcel 309 Compass Way Port Huenem UnPlaced UnPlaced UnPlaced 50' off from house Placed in front of parcel 2376 Katherine Ventura Placed in front of parcel 20' from house Placed on house Placed in front of parcel 229 W. Sidlee St Thousand O Placed 120' from parcel 10' from house Placed on house 300' off from house 231 Mcafee Court Thousand O Placed 100' from parcel Placed on house Placed on house 250' off from house 1187 Roxbury Place Thousand O Placed 120' from parcel Placed on house Placed on house 75' off from house 3151 Calle Quebracho Thousand O Placed 25' from parcel Placed on house 15' off from house Placed on house 552 E. WILBUR Thousand O Placed in front of parcel Placed on house 20' off from house 20' off from house 598 Hodencamp St Thousand O Placed 20' from parcel Placed on house Placed on house 100' off from house

16 Results Matrix continued Address City/Area Zip County Centerline Locator "New Developments: County Address Point Locator GOOGLE MAPS MICROSOFT BING MAPS 760 Ocean Breeze Dr Port Huenem Placed 100' from parcel Placed on house Unplaced Unplaced Ellice St Malibu Placed 400' from parcel Placed on parcel 1500' from house 200' from house 4030 Adolfo Dr Camarillo Placed 500' from parcel Placed on house 6000' from house 1500' from house 1750 Weldon Pl Thousand O Placed in front of parcel Placed on parcel Unplaced Unplaced 880 Coronado Cr Santa Paula Placed 200' from parcel Placed on house Unplaced Unplaced 3766 Dunkirk Dr Oxnard Placed 30' from parcel Placed on house 2000' from house Placed 2000' from house 1244 Paseo Rancho Serrano Thousand O Placed 40' from parcel Placed on house Unplaced Unplaced 1164 Roadrunner Wy Simi Valley Placed in front of parcel Placed on house Unplaced Unplaced

17 A Picture is Worth

18 A Comparison between Google &County GIS for 4030 Adolfo Dr. Camarillo, Google 8/12/09 NOTE: Google point is over 1 mile from actual location. (6000 ) New development data (situs, and parcel) available to County since October 19, 2008!

19 Google results for 4030 Adolfo Dr. Camarillo, CA Google 8/12/09 Google point is over 1 mile from actual location. (6000 )

20 A Comparison between Google and County GIS for 3766 Dunkirk Dr. Oxnard, CA 1/2Mile from correct site GOOGLE Notice OLD imagery County GIS

21 A Comparison between Google and County GIS for Ellice St. Malibu, CA Correct Location GOOGLE County GIS Incorrect Googled Location

22 Closing Thought: Source Matters The LAPD issue illustrates the pitfalls of blurring the lines between professional-grade systems/processes and consumer-oriented tools It also underscores the importance of having experienced, professional GIS architects and analysts on your side when specifying and contracting the development of a complex mapping and data system.

23 Your Challenge Determine the source Acquire data from original source Review the metadata Demand excellence (quality, precision, and accuracy)

24