AW: Geommodul and Linestring Query

Hello Kostis,

perfect thanks :)

Dennis

-----Ursprüngliche Nachricht----- Von: users-list [mailto:users-list-bounces+dennis.wiest=avitech.aero@monetdb.org] Im Auftrag von Kostis Kyzirakos Gesendet: Montag, 15. Juni 2015 11:41 An: Communication channel for MonetDB users Betreff: Re: Geommodul and Linestring Query

Hi Denis, You have a typo on your query. In order to create a LineString geometry from text you should the function linefromtext or geomfromtext.

SELECT forests.name,buildings.name FROM forests,buildings WHERE "Intersect"(buildings.outline, LineFromText('LINESTRING(53.9 29.9, 53.0 29.0)', 0)) = true;

or

SELECT forests.name,buildings.name FROM forests,buildings WHERE "Intersect"(buildings.outline, GeomFromText('LINESTRING(53.9 29.9, 53.0 29.0)', 0)) = true;

You can also check out which similar function are available by executing the following query:

SELECT * FROM functions WHERE mod='geom' AND name LIKE '%fromtext%';

Cheers, Kostis

On 15-06-15 10:26, Dennis Wiest wrote:

Hello,

I have a question for Geomodul. Is it possible to execute the following query with a LineString.

This is myquery with a point and the sample data set from the documentation.

SELECT forests.name,buildings.name FROM forests,buildings WHERE "Intersect"(buildings.outline, Point(53.9,29.9)) = true;

Now I want toreplace the Pointwith aLineString like this in mysql.

SELECT forests.name,buildings.name FROM forests,buildings WHERE "Intersect"(buildings.outline, LineString(Point(53.9,29.9), Point(53.0, 29.0))) = true;

TestDatabase

CREATE TABLE forests(id INT,name TEXT,shape MULTIPOLYGON);

CREATE TABLE buildings(id INT,name TEXT,location POINT,outline POLYGON);

INSERT INTO forests VALUES(109, 'Green Forest',

'MULTIPOLYGON( ((28 26,28 0,84 0,84 42,28 26), (52 18,66 23,73 9,48 6,52 18)), ((59 18,67 18,67 13,59 13,59 18)))');

INSERT INTO buildings VALUES(113, '123 Main Street',

    'POINT( 52 30 )',

    'POLYGON( ( 50 31, 54 31, 54 29, 50 29, 50 31) )');

INSERT INTO buildings VALUES(114, '215 Main Street',

    'POINT( 64 33 )',

    'POLYGON( ( 66 34, 62 34, 62 32, 66 32, 66 34) )');

SELECT forests.name,buildings.name

FROM forests,buildings

WHERE forests.name = 'Green Forest' and

Overlaps(forests.shape, buildings.outline) = true;

many thanks

Dennis

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