thanks for the tip, your book looks great...ill have to get it.
The windturbine table exists in EPSG:4326. I made a seperate table for the images because I didn´t wan´t to blow the size of the wind turbine table out of proportion and jeopardize performance. I am making a simple application to show wind turbines as wms and I wanted to show the turbine in a popup. I´m not sure how to get the popup to display though. Any examples? Thanks, Rob ________________________________ Von: Paragon Corporation <l...@pcorp.us> An: PostGIS Users Discussion <postgis-users@postgis.refractions.net> Gesendet: Samstag, den 5. März 2011, 18:21:49 Uhr Betreff: Re: [postgis-users] images in postgresql Robert, Is there a reason why you have the points in a separate table or do you have points in both tables and you want to relate by a spatial join? If its a 1 to 1 relationship, we would just put them in the same table. As far as foreign keys go, you should have some identifier the same in the two tables. Do you? So it would be of the form SELECT wt.wt_id, wt.geom, p.picture FROM windturbines As wt INNER JOIN pictures As p ON wt.wt_id = p.wt_id or if they are spatially related by space SELECT wt.wt_id, wt.geom, p.picture FROM windturbines As wt INNER JOIN pictures As p ON ST_DWithin(wt.geom, pt.geom, 10) The 10 depends on the spatial reference system or if you are using geography type then it means 10 meters. So I'm treating the wind turbine location and picture location as the same if they are within 10 meters apart. BTW: you might want to read the first chapter of our upcoming book. It's a free download and answers this type of question with concrete examples. http://www.postgis.us/chapter_01 Leo http://www.postgis.us ________________________________ From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Robert Buckley Sent: Saturday, March 05, 2011 5:39 AM To: postgis-users@postgis.refractions.net Subject: [postgis-users] images in postgresql Hi, I am just experimenting at the moment with a project and could do with some advice. I have created a database which contains photos of Windturbines. I also have a postgis database with the locations (points) of the wind turbines and would like join the photos to the points via a link table or foreign key. As you can tell, I haven´t too much experience with postgresql and relational database design. But i can imagine that the task should not be too difficult. I am just a bit unsure how to go about it. The photos are on the linux server and the creation of the table and the insert of the image was successfull. But how do i get the join and how would I display this photo in a geoext project? thanks for any tips, Robert
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