Which of the following is an example of primary GIS data in a salmon restoration project?

In a salmon restoration project, primary GIS data refers to information that is collected directly from the field or generated by techniques that capture present and original conditions. GPS points of stream centerlines exemplify primary data because they are collected directly from field measurements using Global Positioning System technology. This kind of data is specific to the project and can be used to analyze the spatial relationships and characteristics of the stream environment crucial for salmon habitats.

In contrast, historic georeferenced maps and NOAA bathymetry data involve the use of previously collected datasets. While these may provide valuable context and supplementary information for the project, they do not constitute primary data as they were not collected specifically for the current restoration efforts. Similarly, census data, while useful for demographic analysis in relation to the project, is also derived from earlier collection methods and is not firsthand data relevant to the immediate study of the salmon restoration project.