You're faced with conflicting data sources in GIS. How do you navigate the discrepancies to ensure accuracy?

1 Cross-Check Data

When faced with conflicting GIS data, cross-referencing information with additional sources is a critical first step. By comparing the conflicting data against other reputable datasets or authoritative records, you can identify which set of data is more reliable. This process might involve checking metadata for information about data collection methods, accuracy, and date of creation. Metadata is the data about the data, and it can provide crucial insights into the quality and reliability of the information you are using.

2 Evaluate Sources

Evaluating the credibility of each data source is essential in GIS. Look into who produced the data, the methods they used, and their purpose. Trustworthy sources often have a history of reliability and are transparent about their methodologies. If a government agency or a well-known research institution provides one of your datasets, it may carry more weight than data from an unverified source.

4 Analyze Patterns

Look for patterns in the conflicting data. Spatial patterns, trends, or anomalies can provide clues about which dataset might be more accurate. For example, if one dataset consistently shows a higher elevation in a region known to be flat, it might be less accurate than a dataset that aligns with the expected topography. Analyzing these patterns requires a keen eye and a deep understanding of the geographic context.

5 Consult Experts

Sometimes the best way to resolve data discrepancies is to consult with experts in the field. These could be other GIS professionals, local authorities, or subject matter experts familiar with the area or data in question. Their insights can help you understand the nuances of the datasets and guide you toward the most accurate information. Networking with professionals and joining GIS forums can be invaluable for this purpose.

6 Document Findings

Finally, documenting your process and findings is crucial when handling conflicting GIS data. Keep a record of the sources you've checked, the experts you've consulted, and the decisions you've made regarding which data to use. This documentation will not only provide a reference for future projects but also support transparency and reproducibility in your work. It's an essential part of any GIS professional's workflow.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?