PostGIS Terminal: Unterschied zwischen den Versionen
Stefan (Diskussion | Beiträge) (→XAPI-to-Map) |
Stefan (Diskussion | Beiträge) (→XAPI-to-Map) |
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=== XAPI-to-Map === | === XAPI-to-Map === | ||
− | ''NOTE: !'' | + | ''NOTE: If PostGIS Terminal shows an error, try to Copy&Paste the examples below into the browser of your choice!'' |
You can query the PostGIS-Terminal by using the [[XAPI]] syntax from [[OSM]], like this: | You can query the PostGIS-Terminal by using the [[XAPI]] syntax from [[OSM]], like this: |
Version vom 7. November 2011, 00:35 Uhr
PostGIS Terminal is an online browser shell to query PostGIS database (using Spatial SQL) and to see the result in a map window in the browser. The background map and geodata comes from OpenStreetMap.
>> Go to PostGIS Terminal... << - NOTE: Use with care! There is no warrranty about availability!
Inhaltsverzeichnis
About
The PostGIS Terminal was developed based on the original idea and implementation of Marc Jansen and Till Adams. They are the authors of the german OpenLayers book (see [1] and [2]). The idea was also realized independently in postgisonline.org.
PostGIS Terminal is mainly a rich client written in JavaScript with some server code currently in PHP. Specifically it runs on Apache (with PHP support), PostgreSQL/PostGIS (see EOSMDBOne) plus OpenLayers. There are no other SW dependencies.
Über...
Notes (in german): Das PostGIS Terminal ist eine Art Webadmin-Tool zur Visualisierung von Spatial SQL Queries und kann für Ausbildungzwecke aber auch für GIS-Administratoren nützlich sein. Installieren siehe _README.txt. Es gibt ev. mal eine Homepage auf http://labs.geometa.info/ (analog http://openlayers-buch.de/beispiele/chapter-09/postgis-terminal.html ). Setzt Apache/PHP und PostgresSQL/PostGIS voraus. Passende Daten dazu stammen beispielsweise von OpenStreetMap (http://download.geofabrik.de/osm/ ). Testen mit den Beispielen in _EXAMPLE_QUERIES.txt und nice-queries-for-postgis-console.sql. Könnte theoretisch auch weitere Geo-Datenbanksysteme unterstützen (müsste dann aber umbenannt werden).
How to use it
WKT ( ST_AsText(...) ) is being displayed in map window.
The result of a query (resultset)...
- SELECT WKT... FROM ... => map
- SELECT ST_AsText(...) AS geom FROM ... => map
- SELECT ST_AsText(...) AS geom, name as label FROM ... => map with text label
else => output goes to log window.
Credits / License
Credits to...
- Marc Jansen/Till Adams (code, OpenLayers book)
- and Hartmut Holzgräfe (code)
- and the fabulous OpenStreetMappers (data).
Software is licensed under "New BSD License" (see http://en.wikipedia.org/wiki/BSD_licenses ).
Terms of Use
Help
Database
- Tables and Attributes
- You can find out more about the actual database by clicking on the '?' button right to 'Database'. To find out the attribute names, you can do a: "SELECT * from osm_point"
- Schema
- For a more information about the database see 'Enhanced OpenStreetMap Database One' (EOSMDBOne).
- Key/Value Pairs
- If you are searching for the right keys and values, try Taginfo (http://taginfo.openstreetmap.ch/); e.g. search for key 'tourism', then click on the key again and you get the values, like 'zoo' (which makes "tourism = zoo"). See also 'Map Features' on OSM Wiki.
SQL Help
To be defined. The use of selectors which "generate" SQL into query input console is experimental from an eLearning view.
Help using PostGIS Terminal
PostGIS Terminal analyses your SQL query (from your input into the Query editor), beautifies it and looks for placeholders. Output (text or map) can be controlled with field names (or function names) if they exist in the SQL console input or in the query result.
Output can go to
- log window (called "text query") or to
- map window (called "map query").
"map queries" can be either be "geometry" (= point, linestring, polygon) or "marker" (= icon).
.--------------------------. | PostGIS Terminal... | |--------------------------| | xxx | | | | | | Query: | | | ####### | Map Window | | ####### | | | | | | Log: | | | ####### |----------------| | ####### | Footer | .--------------------------. Figure: GUI Layout of PostGIS Terminal.
Reserved field and function names are:
- "geom" : field with WKT geometry.
- "label : field with text displayed as a label of the geometry.
- mapextent(): bbox of current map view.
System variable placeholder:
- _table: for current Table/name name.
- _geom: for Geometry attribute name.
- _string: for Search name.
- _mouse_x/_mouse_y: for each mouse click in map window.
See e.g. examples below.
Examples
See also POIs for other frequently used tags.
Zoos der Schweiz:
SELECT ST_AsText(way) AS geom, name||' '||osm_id AS label, tags FROM osm_all WHERE tags @> hstore('tourism','zoo')
Schweizer Kernkraftwerke mit 40 Km-Puffer:
SELECT ST_AsText(ST_Buffer(ST_Centroid(way),40000)) AS geom, name AS label FROM osm_all WHERE tags @> hstore('generator:source','nuclear')
Alle Restaurants mit Namen 'Rössli' der Schweiz:
SELECT ST_AsText(way) AS geom, name AS label FROM osm_point WHERE amenity = 'restaurant' AND name ILIKE '%rössli%'
Alle 4000er Berggipfel der Schweiz:
SELECT ST_AsText(way) AS geom, name||','||ele AS label FROM osm_point WHERE "natural" = 'peak' AND to_number(ele, '9999') >= 4000
Alle Picnic-Plätze und Aussichtspunkte im aktuellen Kartenausschnitt:
SELECT ST_AsText(way) AS geom, name AS label FROM osm_point WHERE tourism IN ('picnic_site','viewpoint') AND ST_Contains(mapextent(), way)
XAPI-to-Map
NOTE: If PostGIS Terminal shows an error, try to Copy&Paste the examples below into the browser of your choice!
You can query the PostGIS-Terminal by using the XAPI syntax from OSM, like this:
- Zoos: http://labs.geometa.info/postgisterminal/?xapi=node[tourism=zoo] [3]
- Castles: http://labs.geometa.info/postgisterminal/?xapi=node[historic=castle] [4]
- Viewpoints: http://labs.geometa.info/postgisterminal/?xapi=node[tourism=viewpoint] [5]
- Hedges: http://labs.geometa.info/postgisterminal/?xapi=line[barrier=hedge] [6]
Feedback
See >>> Diskussion:PostGIS_Terminal <<<
Download and Installation
- There's no download yet (pls. send request as e-mail).
- Installation, readme and more are included in the delivery (zip file).