Confidentiality of plot coordinates - Alternatives?

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Presentation transcript:

Confidentiality of plot coordinates - Alternatives? Sue Willits Forest Inventory and Analysis Program August 1, 2002 National FIA Users Group Meeting

We still need to discuss the “HOWS” of masking data and What it means to you the Users………. Forest Inventory and Analysis

Alternatives for Masking Ownership Step 1: Review every county for each ownership category to determine if there are a minimum of 3 owners in each category (industry vs. other). If not, then we combine counties or collapse owner categories

Alternatives for Masking Ownership Step 2: Option 1: Fuzz coordinates so that 3 or more owners are in the general area. (could be moved to county center). Pro: Individual plot attributes are maintained Con: Spatial detail will be variable Must be automated Could create inconsistency between counties if large fuzz was used instead of county center.

Alternatives for Masking Ownership Step 2: Option 2: Create strata within a county by Forest Type and Stand size. Provide average data for all plots within the strata. Provide fuzzed coordinates with the averaged data. Pro: Creates a simple spatially explicit database Consistent for county level reporting Con: Pre-defined Strata of interest No individual plot data May mask spatial data for non-tree variables Assumes uniform plot weights for area expansion Plots are not necessarily contiguous

Alternatives for Masking Ownership Step 2: Option 3: Swap 25% of the plots with similar plots (forest type and stand size) across all owners within the county. Try to find plots in close proximity. Pro: Would not require checking for rule of 3 Automation could happen fairly quickly Would provide consistency Con: Data may be too similar to truly provide masking