General Information
Finding good data for your application can be difficult. Like most "information", geospatial data is subject to credibility problems and issues. Users should be aware that finding the right data might take time and effort. Many states have adopted data and metadata standards. These standards may help users identify the quality of the data. However, metadata standards and practices are usually voluntary and many data sets do not have metadata attributes.
Most users will need to find appropriate data regardless of the presence or absence of metadata. Some states have clearinghouses of geospatial data and information. This is a good starting place for finding information. Regional or local bodies may also be a good place to begin.
National Datasets for State Use
There are several datasets that are developed nationally but are good base map products for state and local use. While these datasets may not be as rich in locally developed data, they are useful when you need to have data that crosses boundary lines or when you need information over a large area. Some examples of this data are:
- National Hydrography Dataset
- Topologically Integrated Geographic Encoding and Referencing system (TIGER)
- Soil Survey Geographic (SSURGO) Database
- National Geodata.gov site
State GIS Clearinghouse Data
Many states have agencies or entities who act as data libraries or clearinghouses for data and data resources. If your looking for local data, check with your city or county governments as they usually have their own data set that is more accurate for your area then your state may have. If your looking for state transportation data, you should look to your state DOT office, likewise if your looking for natural resource data, your state DNR office might be able to help.
Data Resources
Important Considerations
