Hi Dave, More questions!
I'm copying gpc-dev so we can all learn together. Before you reply all, note the public archive http://listserv.kumc.edu/pipermail/gpc-dev/ I'm working with Maren and Sravani on this stuff. Joining on zip code was straightforward: we used the zcta5 column of acs_20135a/zcta_860/ge.00_file.dat.gz. But now we're trying to join on tract and census block. What columns of acs_20135a/blck_grp_150/ge.00_file.dat.gz and acs_20135a/tract_140/ge.00_file.dat.gz should we use? What are their primary key columns? Which documentation would tell us this? BLKGRP looks like a single-digit number; it's clearly not a unique key to the blck_grp_150 data. TRACT is a bigger number, but it's not a unique key to tract_140 either. It seems to be unique within state, though. Is that right? Should we join TRACT_ID and ST_ABRV from geocoded_kumc.txt with TRACT and STUSAB of tract_140? Have any other GPC sites figured this out yet? MU? UTHSCSA? For reference, these are the columns of our kumc_geocoded.txt data: 'OID,Join_Count,TARGET_FID,Loc_name,Status,Score,Match_type,' 'X,Y,Match_addr,DISP_LON,DISP_LAT,SIDE,' 'ARC_Address,ARC_City,ARC_State,' 'ARC_Zip,ADDRESS,CITY,STATE,ZIP,New_X,New_Y,ID,BLOCK_ID,' 'FIPSST,FIPSCO,FIPSSTCO,TRACT_ID,ST_ABRV,CO_NAME,ST_NAME context: https://informatics.gpcnetwork.org/trac/Project/ticket/140 https://informatics.gpcnetwork.org/trac/Project/ticket/350 -- Dan
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