Tuesday, October 27, 2009
Lynchburg's newly revamped GIS system is receiving recognition in both the GIS blogosphere and public media. A recent News and Advance article focuses on the new features available in the public viewer including user markup tools, export tools, and links to Google Street View and Bing Maps. A recent post on All Points Blog includes a discussion of the public viewer and the intranet functions available to City staff. The blog post views the application as an indicator of the growing trend of moving from desktop apps to enterprise web GIS. Both applications are hosted and maintained internally by the City, with support provided under contract with the system developer WorldView.
Tuesday, October 20, 2009
The Wednesday, October 21st webinar will run from 10:00AM to 12:00PM and can be accessed here and using the password southwest. Alternatively you can call in on a teleconference number 866.808.8516 with access code 7080539035. While the webinar is intended primarily for Southwest Virginia, folks who could not make one of the other Town Halls are welcome to join in.
Saturday, October 17, 2009
Friday, October 16, 2009
While this decision is from the California court system, the issues litigated are common in every state. The full article is available from the Silicon Valley Mercury News.
Thursday, October 15, 2009
Google has caused a bit of a stir by dropping Tele Atlas as their US data provider and switching to their own, self-managed dataset. Google has caught some flack in the blogosphere for being less than transparent about their data sources and providing nothing even resembling metadata. Users must discover for themselves what and where is new. The road centerlines have changed, public parkland and campus maps have been added, and in some areas parcel lines are displayed. Also, Google has added a quick link for reporting user suggestions for error corrections and updates.
Looking at my neighborhood it appears that Google is using a mix of parcel addresses and route geocoding to locate addresses. In my area if you search for a correct parcel address the marker is placed within the parcel boundary, as in the first map example. There is an error here in Google Maps. The road marked Gardenwood Ln is actually my unnamed driveway and Gardenwood Ln is the private road to the east. If you search for a correct Gardenwood Ln address the marker is correctly placed within the proper parcel (the second map). However, if you search for a Gardenwood address which is not in the parcel data, the route geocoding places the marker on the incorrect Gardenwood Ln (i.e. my driveway on the third map).
The Gardenwood Ln error seems to have come from the US Census Tiger Data, suggesting Google is using TIGER data as a source, at least for Albemarle. (OpenStreetMap, which uses TIGER data has the same error.) Albemarle County GDS and the VGIN RCL datasets both have the correct Gardenwood Ln. Presumably, Google is using Albemarle GDS parcel data for parcel lines and addresses. I have reported the error to Google but have not yet heard back. Is anyone else finding parcel lines in their locality? Is parcel information available? Comments welcome.
Friday, October 9, 2009
Thursday, October 8, 2009
I saw this post on All Points Blog that Google had dropped Tele Atlas as its addressing data provider for the United States (but not elsewhere) and is now managing these data on its own. Checking out my "favorite" addresses I found some obvious changes. Address points now seem to be located on or near buildings in some areas. Some previous omissions and errors are now corrected. However some new errors were also found; my driveway for instance is incorrectly labeled with the name of the private road to the east. This gave me an opportunity to try another new Google Map feature, Report a Problem, which allows users to suggest edits or changes to their map data. I reported my driveway problem last night and I will let you know if and how it is resolved.
Monday, October 5, 2009
Friday, October 2, 2009
Need some video to help explain the value of geospatial technologies? Well Penn State Public Broadcasting may be able to help you. Their Geospatial Revolution Project is developing a series of eight video episodes "...about the world of digital mapping and how it is changing the way we think, behave, and interact." You can view the trailer below: