update import README and tag script

Author: rinigus

importer/README.md

@@ -1,13 +1,25 @@
-Import program and scripts.
+# Import program and scripts.
 
-Import program is using moodified libosmscout library that can be installed
-by `install_deps.sh` script. 
+Import program is using Nominatim database and filters the data using boundary
+given in GeoJSON file.
 
-To generate larger amount of missing tags for the input map stylesheet
-and whitelist, the scripts under `scripts/tags` (from main directory
-of the project) can be used.
+The boundary file can be generated from POLY files as provided by Geofabrik or
+given in hierarchy folder of OSM Scout Server (see
+https://github.com/rinigus/osmscout-server/tree/master/scripts/import/hierarchy).
+As a converter, [poly2geojson](https://github.com/frafra/poly2geojson/) can be
+used.
 
-Used:
+Data can be filtered using data/priority.list and data/skip.list files. Those
+list OSM tags in the form where tag type and its value are merged using `_`. Out
+of the lists, the priority one gives locations that would be kept in the
+database even without names associated with them for reverse geocoding. The
+"skip" list allows to specify locations that would be dropped by location type.
+
+To generate larger amount of tags for the priority list, the scripts
+under `scripts/tags` (from main directory of the project) can be used.
+
+## Used
 
 - Nominatim Docker https://github.com/mediagis/nominatim-docker/
-- For testing: Nominatim-UI https://github.com/osm-search/nominatim-ui
+- For testing: Nominatim-UI https://github.com/osm-search/nominatim-ui
+- poly2geojson: https://github.com/frafra/poly2geojson

scripts/tags/generate_mapstyle.py

@@ -5,8 +5,7 @@
 db = sqlite3.connect('taginfo-db.db')
 c = db.cursor()
 
-mapost = ""
-whitelist = ""
+prioritylist = ""
 
 keyvals = []
 for r in c.execute("select key,value from tags where key='shop' order by count_all desc limit 50"):
@@ -22,13 +21,8 @@
 for r in keyvals:
     key, value = r
 
-    mapost += '  TYPE ' + key + '_' + value + '\n'
-    mapost += '    = NODE AREA ("%s"=="%s")\n' % (key, value)
-    mapost += '      {Name, NameAlt}\n      ADDRESS POI\n      GROUP ' + key + '\n\n'
+    prioritylist += key + '_' + value + '\n'
 
-    whitelist += key + '_' + value + '\n'
-
-print(mapost)
-print(whitelist)
+print(prioritylist)