OpenStreetMap
A couple of weeks ago I was looking at Google Maps in the southeast area of Morgan Hill, California for assistance in updating OpenStreetMap. I found numerous errors, some of them rather severe, and reported them to Google for correction. Even though they acknowledged my submissions as being correct, so far nothing has changed when I look at the same area. Moreover, it seems that Google Maps was more accurate as recently as a year or two ago. They seem to have imported some new databases that are riddled with errors.
That said, OpenStreetMap has the potential to become much more accurate and useful than Google Maps. However, the aerial photography that is supplied by Yahoo! is terribly out of date. For instance, the new Morgan Hill Library was built in 2006-2007 and dedicated in July 2007. The aerial photo for the Morgan Hill Civic Center still shows a graded lot with some construction equipment around the edges, so it was probably shot in the late summer of 2006. That's nearly FOUR YEARS ago! What can we do to get new aerial or satellite imagery?
토론
2010년 5월 2일 01:42에 andrewpmk님의 의견
This seems to be a perennial problem with Google Maps and other proprietary data. For instance, Google recently (a few days ago) rolled out new data for Canada, which is mostly derived from GeoBase government data (which OpenStreetMap is also using). It is full of errors and omissions, for instance the lack of the recently opened northern extension of Highway 410 in Brampton which is correct on OSM. My only advice is to keep mapping and NEVER use Google as a data source.
2010년 5월 2일 02:06에 user8192님의 의견
I happen to live in Morgan Hill, so I have the choice of checking an online map or taking the time to get into the car or hop onto a bicycle, going to the area in question and checking it out in person. Sometimes even working from memory seems to produce better results than using Google Maps, Mapquest or Mapblast!
2010년 5월 2일 07:26에 Komяpa님의 의견
Try out Google Maps mutator that makes all the google maps better ;)
osm.org/user/Komяpa/diary/8328
2010년 5월 2일 12:52에 chillly님의 의견
Rather than trace from Yahoo, why not go out an gather the real, up-to-date data from the ground? It's fun and it's makes the best maps.
2010년 5월 2일 18:01에 pavithrans님의 의견
Yahoo imagery is of no use for me as for the given zoomlevel I cant even identify my small town in India . Google was the same 3 years back but 1 year back a satellite has visited and gave great imagery which lead to huge contributions to g maps . I am trying to get most of the data via GPS .
2010년 5월 4일 00:41에 user8192님의 의견
@chilly, I don't have a GPS unit at present, and I value my health and safety too much to go out into the street with a compass and tape measure.