Access DC's Vector Property data (and all DC GIS data) via ArcGIS.com or ArcGIS Online Explorer!
ArcGIS.com is new component of the ArcGIS System; you can browse a gallery of featured maps and apps from the ArcGIS community or create your own.
Administrative & Other Boundaries
Business and Economic Development
Cultural and Society
Facility and Structure
Planning Landuse and Zoning
Property and Land
Utility and Communication
Using the ArcGIS.com viewer you can add DC’s Vector Property layers. After clicking on Make a Map, click the Add button. Search property and land dc and add either of the returns. Another layer to add is OwnerPoly. By using this mash-up method you ensure you’re getting the best data available. The ArcGIS.com viewer makes it easy to discover and mash-up other Web services into a new map.
ArcGIS Explorer Online - http://explorer.arcgis.com/ has a similar look and feel and some of the same capabilities as the downloadable desktop version, but it's a lightweight version built using Silverlight that runs in a browser. Explorer Online offers some additional functions and capabilities. You can also add dc data to ArcGIS Explorer Online.
We also suggest joining Washington DC GIS Group
DC GIS PUBLISHES A LARGE MAJORITY OF ITS DATA VIA MAP SERVICES
The District of Columbia’s GIS program is pleased to announce the launch of 50+ map services that are designed to be integrated with Web sites and other information technology applications. The services enable software developers to more easily leverage the District’s substantial collection of geospatial data. The services feature an attractive new “DC Basemap” and a collection of 200+ map layers categorized by themes such as Administrative Boundaries, Business-Economic Development, Education, and more.
Additional information is available at Develop Websites Using GIS Web Services.
DC GIS AUTOMATES VPM DATALOAD PROCESS
As of 1/15/2010 the VPM data loads (including OwnerPLY) to DC Central are automated and occur weekly. The automated process runs on Friday evenings at 10:30pm. While we were unsucessful at true "Replication" b/c of the way our Maintenance Application works (built on 8.3 data model) we opt'ed for a more creative path to providing timely data.
Previously the VPM data loading process to DC Central was monthly and manual. It took ~8hrs to run the entire process and we frequently dealt with user lock issues not to mention someone spending the better part of a Friday night watching data copy.
The new processs is automated and occurs weekly. Its faster (~55mins vs 8hrs), lock issue are minimal, its true hands-free maintenance, and finally provides quicker community access to the most current VPM data.
There are 2 distinct processes:
1. Copy (via SDEEXPORT/SDEIMPORT) from VECTORDB (VPM's SDE) to a staging schema, if ok, then move to Production, set User privileges etc.
2. Build OwnerPly from VPM features and latest ITS-PE (Tax Public Extract File) weekly using a similar process of SDEEXPORT/SDEIMPORT.
CORRECTIONS TO THE OWNERPOINTS LAYER
The VPM team has been working with OTR to clean up the ownerpoints layers. We’ve provided information about duplicate OwnerPoints, and OwnerPoints that should no longer exist because they have been combining or split into new properties. The next release of the OwnerPoints should reflect many of these changes.
GOOGLE MAPS NOW INCLUDES DC PARCEL DATA
In early October 2009, Google released a global update to Google Maps. One of the major enhancements is the addition of parcel data for certain areas. DC is one of them (as well it should be, after all we put our data in the public domain). The data they are displaying appears to be circa November 2008. Additionally Google is now acting as a map data provider in many parts of the world, according to industry experts, Google has moved away from using Tele Atlas base data (you’ll no longer see the familiar trademarks at bottom of Google maps). And most importantly you can now report errors you find on the map directly back to Google – they are really making a full blown attempt at seeing if crowdsourcing works for GIS data!
I should add that parcel data is still not accessible via their API, but given what Google has done recently, it’s only a matter of time…
Below is two screen shots, The first is from DC's property data, the second from the same area in Google Maps. As you can see some of the parcels appear to be hidden by Google Map park layer. We've sent in a comment, lets see how long it takes to get resolved... Update 11/24/09, they fixed it! We requested they adjust the parks layer so you could view parcels in this area and they did!! See third image.