The next thing to consider is what data sources are available and accessible for your site analysis. Data sources can be primary or secondary, qualitative or quantitative, and spatial or non-spatial. Primary data sources are those that you collect yourself, such as field observations, surveys, or measurements. Secondary data sources are those that are already collected by others, such as census data, aerial photos, or historical maps. Qualitative data sources are those that describe the qualities or characteristics of a site, such as user preferences, cultural values, or aesthetic impressions. Quantitative data sources are those that measure the quantities or numbers of a site, such as population, area, or slope. Spatial data sources are those that have a geographic location, such as coordinates, boundaries, or contours. Non-spatial data sources are those that do not have a geographic location, such as demographics, policies, or climate. Depending on the type and availability of your data sources, you may need different tools to access, store, and analyze them. For example, if you have a lot of spatial data, you may use a GIS or a CAD software. If you have a lot of non-spatial data, you may use a spreadsheet or a database.