Evaluate Geospatial Data
About This Tutorial
Section titled “About This Tutorial”Note for Instructors
This introductory tutorial can support class and research projects in any discipline where students are expected to use geospatial data but may be less familiar with how to locate and access potential sources of those data. The tutorial is divided into two activities that can be used separately or in conjunction with one another depending on course- or assignment-level learning objectives. These activities may be appropriate for students at both the undergraduate and graduate level. The tutorial was designed to allow for use in in-person, hybrid, and fully online instructional contexts, and instructors could assign the activities to be completed individually or in small groups depending on course structure and goals.
Learning Objectives
Section titled “Learning Objectives”Through completing this tutorial, students will:
- Determine whether or not metadata exists for a given resource
- Review available metadata to evaluate a geospatial dataset for authority, quality, and fitness for use
- Understand where to find citation information
Introduction
Section titled “Introduction”Geospatial data are any data referenced to locations on the earth. Geospatial data provide information about the locations and shapes of, and relationships between, geographic features. For more information on finding data, see Finding Geospatial Data.
Geospatial data can be found in various types and formats. For a brief overview, see this tutorial about Types of Geospatial Information.
Locating the metadata
Section titled “Locating the metadata”Locating metadata can be tricky, as it is usually recommended that data providers create some kind of metadata, but it is rarely required.
For the example below, I searched for “lakes rivers” and focused the map on the Minneapolis area. The first two results both appear to be possible options.
Viewing the first item page
Section titled “Viewing the first item page”Viewing the first item page on the source website
Section titled “Viewing the first item page on the source website”
Viewing the second item page
Section titled “Viewing the second item page”
Viewing the second item page on the source website
Section titled “Viewing the second item page on the source website”
View Metadata
Section titled “View Metadata”
Activity 1
Section titled “Activity 1”Use the worksheet provided to take some notes related to these questions to determine whether or not metadata exists for a given resource.
Examining the Metadata
Section titled “Examining the Metadata”The Federal Geographic Data Committee has a good definition of metadata:
“Metadata is information about data. Similar to a library catalog record, metadata records document the who, what, when, where, how, and why of a data resource. Geospatial metadata describes maps, Geographic Information Systems (GIS) files, imagery, and other location-based data resources.”
Though it often involves extra steps beyond finding useful geospatial data, the evaluation of the data is equally important.
Metadata’s Importance
Section titled “Metadata’s Importance”- Metadata is important, as it allows the user to critically evaluate and assess the credibility, authority, and accuracy of the data. Metadata provides necessary context.
- Metadata often contains information about how the data can be used.
- Metadata also enables proper attribution and citation.
Metadata categories
Section titled “Metadata categories”Metadata records are often split into different categories of information.
Temporal Information
Section titled “Temporal Information”For example, the metadata might contain information about when the data was published or last edited, but also about when the data was originally created
Spatial Information
Section titled “Spatial Information”The metadata will usually have bounding coordinates, but might also have a textual description of the spatial extent.
Attribute Information
Section titled “Attribute Information”The metadata often contains information about what attribute information is included, which can be important in selecting the right data for your project, and can also help decode the attribute names.
Rights Information
Section titled “Rights Information”Some data might be public domain.
While other data may be available, but have some restrictions on reuse.
Attribution and Citation
Section titled “Attribution and Citation”Data attribution and citation is also important, as it allows others to examine and/or replicate your work. In the BTAA Geoportal, we provide a “Cite” link which will give you basic citation information about the data
Activity 2
Section titled “Activity 2”Use the worksheet provided to review available metadata to evaluate a geospatial dataset for authority, quality, and fitness for use.
Resources
Section titled “Resources”Additional resources for evaluating geospatial information:
Spatial Reference Information: Introduction to Spatial References (Esri)