From f39344a943c985e42902ec596f711c630a569d41 Mon Sep 17 00:00:00 2001
From: Felix Delattre <fd@gfz-potsdam.de>
Date: Thu, 25 Mar 2021 19:01:39 +0000
Subject: [PATCH] Separated completeness and area_type fields

---
 README.md                                     | 29 ++++++++++++-------
 ...06_separate_area_type_and_completeness.sql |  8 +++++
 2 files changed, 27 insertions(+), 10 deletions(-)
 create mode 100644 migrations/00006_separate_area_type_and_completeness.sql

diff --git a/README.md b/README.md
index 14627a7..2312ab4 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,8 @@ Please add a small reasoning around the following points for each proposed merge
 | column_name  | data_type          |
 |--------------|--------------------|
 | quadkey      | text (primary key) |
-| completeness | smallint           |
+| area_type    | bit                |
+| completeness | float              |
 
 #### `obm_tiles_geometry` - Geometry information about tiles in WGS84
 
@@ -42,19 +43,27 @@ Created and managed by [inyuu](https://git.gfz-potsdam.de/dynamicexposure/openbu
 
 ## Special attributes
 
+### `area_type`
+
+The `area_type` value expresses the type of area inside a tile.
+
+| Value  | Description  |
+|--------|--------------|
+| `0000` | Undecidable  |
+| `0001` | Empty        |
+| `0010` | Built-up     |
+| `0100` | Seawater     |
+| `1000` | Inland water |
+
 ### `completeness`
 
 The `completeness` value expresses the state of building completeness for a tile.
 
-| value | meaning         |
-|-------|-----------------|
-| `0`   | unknown         |
-| `1`   | complete        |
-| `2`   | almost complete |
-| `3`   | incomplete      |
-| `4`   | undecidable     |
-| `5`   | water           |
-| `6`   | empty           |
+| Value     | Description         |
+|-----------|---------------------|
+| `NULL`    | Unknown, incomplete |
+| `[0`-`1[` | Completeness ratio  |
+| `1`       | Complete            |
 
 ## More information
 
diff --git a/migrations/00006_separate_area_type_and_completeness.sql b/migrations/00006_separate_area_type_and_completeness.sql
new file mode 100644
index 0000000..2b26777
--- /dev/null
+++ b/migrations/00006_separate_area_type_and_completeness.sql
@@ -0,0 +1,8 @@
+ALTER TABLE public.obm_tiles 
+    RENAME COLUMN completeness TO area_type;
+
+ALTER TABLE public.obm_tiles
+    ALTER COLUMN area_type [SET DATA] TYPE bit(4);
+
+ALTER TABLE public.obm_tiles 
+    ADD COLUMN IF NOT EXISTS completeness float;
-- 
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