Workflow/Data-selection.md

-Coming soon
+In order to select data taken only by commercial ships, excluding 
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+specialist ship data sources, such as research vessels a selection criteria has been followed. 
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+Data selection rules are shown in following table. Reports require a day of the month present and to be valid (e.g. 30 Feb not used), but data with a missing hour are included for certain `dck` between 1850 and 1872.  
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+Each action in the following table corresponds to an `ifelse` statement in [split_by_type.R](https://git.noc.ac.uk/brecinosrivas/icoads-r-hostace/-/blob/master/rscripts/split_by_type.R) (all of the table or there are other scripts that I should refer to her??)
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+Rule | Action
+-----: |:------------
+`pt` missing & <br>`dck` = 128, 150, 151, 152, 155, 156, 192, 201, 255, 701, 721, 875, 897, 899 | `pt` = 0 (ship) 
+`pt` missing & <br>`dck` = 797 | `pt` = 13 (C-MAN) 
+`pt` missing & <br>`dck` = 896 & <br>`id` contains PLAT or RIG | `pt` = 15 (platform) 
+`pt` missing & <br>`dck` = 896 & <br> `id` contains SHIP     | `pt` = 0 (ship) 
+`pt` missing & <br>`dck` = 896, 883 & <br> `id` starts with number   | `pt` = 6 (moored buoy) 
+`pt` missing & <br> `dck` = 896 & <br> `id` contains 4Y or C7     | `pt` = 2 (OWS) 
+`irf` = 2 except `dck` = 732 | Use ICOADS `irf` flag but retain `dck` 732 regional exclusions 
+ `pt` = 7    | Exclude drifters 
+ `pt` = 6    | Exclude moored buoys 
+ `pt` = 13    | Exclude C-MAN 
+ `pt` = 14    | Exclude other coastal or island stations 
+ `pt` = 16    | Exclude tide gauges 
+ `pt` = 18    | Exclude profiling floats 
+ `pt` = 19    | Exclude undulating oceanographic recorders 
+ `pt` = 20    | Exclude pinnepeds 
+ `pt` = 21  | Exclude gliders 
+ `dck` = 795, 995   | Exclude C-MAN 
+ `dck` = 735, 740, 780, 782    | Exclude research vessels 
+ `dck` = 793, 794, 993, 994    | Exclude moored buoys 
+ `id` = PLAT, BUOY, RIGG, BOUY    | Exclude non-ship data 
+ `id` missing & <br> `dck` 700    | Exclude drifters 
+ `id` = 5 digits & <br> `dck` = 700 & <br> `sid` = 147 & <br> `pt` = 5  | Exclude buoys 
+ `id` = 5 digits & <br> `dck` = 892 & <br> `sid` = 29 & <br> `pt` = 5   | Exclude buoys 
+ `id` contains TEST but /= CONTEST    | Exclude suspect data 
+  Invalid day   | Exclude data with invalid dates
+  Hour missing   | Except for `dck` = 246, 701, 721 
+** At least one present of  `sst`, `slp`, `at`, `w`, `d`, `ww`, `n`, `wbt`, `dpt`, `vv`, `rh`, `wh`, `nh`, `w1`, `osv` | Exclude reports with no selected variables. 
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