provide better descriptions of variables

Author: goatsweater

example.env

@@ -1,23 +1,29 @@
-# postgresql connection info
+# connection parameters for postgresql
 SEQ_SOURCE_HOST=localhost
 SEQ_SOURCE_DB=stc
 SEQ_SOURCE_USER=postgres
 SEQ_SOURCE_PASS=postgres
 
-# parent geography layer
-SEQ_PARENT_LAYER=LU
-SEQ_PARENT_UID=LU_UID
-# child geography layer
-SEQ_CHILD_LAYER=LB
-SEQ_CHILD_UID=LB_UID
-# road layer
-SEQ_ROAD_LAYER=NGD_AL
-SEQ_ROAD_UID=NGD_UID
-# only required if not wanting to use ST_Length
-SEQ_ROAD_COST=SHAPE_Length
+# output directory for temporary and final files
+SEQ_OUTPUT=.
+
+# parent geography layer details
+SEQ_PARENT_LAYER=lu
+SEQ_PARENT_UID=lu_uid
 
-# block face layer view (road sides)
-SEQ_BF_TABLE=bf_view
+# child geography layer details
+SEQ_CHILD_LAYER=lb
+SEQ_CHILD_UID=lb_uid
+
+# road layer details
+SEQ_ROAD_LAYER=ngd_al
+SEQ_ROAD_UID=ngd_uid
+# only required if not wanting to use ST_Length
+# SEQ_ROAD_COST=length
 
-# outputs sqlite database
-SEQ_OUTPUT=../sequencing/seq.db
+# DB table of edges to be sequenced
+SEQ_BF_TABLE=bf_list
+# field containing preferred turn direction
+SEQ_BF_SIDE_FIELD=arc_side
+# preferred turn direction when routing
+SEQ_BF_SIDE_PREFERRED=R