US CSB: eight editions, and a real field id - #252
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This was referenced Sep 11, 2026
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One archive carries the whole sequence: CSB1724.gdb has a CDL<year> crop column for every year from 2017 to 2024, so each edition reads the same source with its own column and takes its determination date from the variant. The dissolve merges every CSB polygon of one crop within a state and splits it again, so an output field is not a source CSB. CSBID and CNTY survived through aggfunc="first" and described an arbitrary member of the group — CSBID gave 3,093 distinct ids to 7.5 million fields. The fields are numbered now and neither column is published as if it described them. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DVx9uQV2QPM8ecPAY3ZjXG
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m-mohr
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Sep 17, 2026
Grouping on CNTYFIPS keeps every group inside one county, so the county that aggfunc="first" carries over holds for every field the group produces. A dissolve on attributes never cuts a source polygon, it only declines to merge across the line: in Delaware 14,308 fields become 14,321. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DVx9uQV2QPM8ecPAY3ZjXG
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Update year and id for CSB.