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GIS options debated for co‑occurrence maps; log scale and wetlands mapping prioritized
Summary
Committee members discussed GIS support (Sandwich ArcGIS account, CAI, QGIS), agreed a log scale is needed for combining layers, and considered digitizing Barry Keith’s ~1984 wetlands maps to fill data gaps.
Dylan Alden told members a colleague is willing to help with the GIS work required to assemble the layers for co‑occurrence mapping; he noted that Sandwich maintains a paid ArcGIS account which the committee might use. The group discussed Cartographics (CAI) as an option that would allow adding a layer each year but with less control, and Dwight Emery said he is experimenting with QGIS as a free alternative.
David Little emphasized that when scores from heterogeneous layers are combined and displayed, a logarithmic scale is likely required because the various layers have very different magnitudes and levels of specificity. The committee discussed gaps in wetland mapping and raised the possibility of digitizing Barry Keith’s ~1984 wetlands maps for Tamworth; Nancy Walser agreed to check whether similar historical mapping exists for Sandwich.
