0
votes
1answer
16 views

MySQL Syntax - Searching points within polygons using GeomFromText

I am trying to select points within polygons using the GIS/spatial extensions for MySQL. I'm fairly new to this, so bear with me if this is an elementary question. I have points defined as text ...
1
vote
0answers
31 views

Find the neighbouring polygons of a given polygon in a MySQL spatial table in ver < 5.6.1

Finding neighbouring shapes in MySQL spatial table made up of ID and 2D geometry (polygon) fields. I have a table with an ID column and a geometry column (holding a polygon) representing various ...
0
votes
0answers
40 views

Backup in Mysql periodically

I have trouble scheduling a backup in mysql periodically, most of the tools do not recognize the geometric field, for example navicat which says Can not get geometry object from data you send to ...
1
vote
1answer
488 views

Spatial Index on an InnoDB table

I have a database which is in InnoDB, because I wanted consistency (cascading delete). Now, I want to use spatial indexes for selecting rows ordered by geometric distance. However, spatial indexes ...
2
votes
1answer
151 views

Scaling of PostGIS vs MySQL cos/sin calculations [closed]

I need to sort database rows according to GPS coordinates (or any other geographical representation). The way I've understood it, MySQL Spatial Indexes are too buggy at the time of writing (at least ...
1
vote
1answer
335 views

GeomFromText in trigger has error

I have this trigger: DELIMITER $$ CREATE TRIGGER geometrytrigger BEFORE INSERT ON users FOR EACH ROW BEGIN SET NEW.user_geometry=GeomFromText(NEW.user_geometry); END$$ DELIMITER ; when I insert a ...
2
votes
1answer
406 views

What is the syntax for querying a spatial column?

What is the right syntax to get all the points within the bounding box? The table consists of a lat and lng column and a spatial column "pt" generated from the lat/lng values. calculated the topleft ...
5
votes
1answer
3k views

What's the difference between POINT(X,Y) and GeomFromText(“POINT(X Y)”)?

I'd like to store some geometric positions in my MySQL database. For this I use the POINT datatype. Almost everywhere I read that the function GeomFromText should be used to insert data in the table. ...
4
votes
1answer
4k views

Mongodb - Returning the points nearest to a location, with distance

What is the MongoDB's equivalent to this query: SELECT 111151.29341326 * SQRT( pow(-6.186753-`Latitude`, 2) + pow(106.772835-`Longitude`, 2) ...
0
votes
0answers
22 views

A spatial query return no result when obviously there is result [duplicate]

Possible Duplicate: Less restrictive query return less result due to simple removing one additional constraint SELECT DISTINCT TB.ID, TB.Latitude, TB.Longitude, ...
6
votes
2answers
311 views

Less restrictive query return less result due to simple removing one additional constraint

Look at this query SELECT DISTINCT TB.ID, TB.Latitude, TB.Longitude, 111151.29341326*SQRT(pow(-6.185-TB.Latitude,2)+pow(106.773-TB.Longitude,2)*0.98839228980165) AS Distance FROM ...
3
votes
1answer
329 views

How does R-Tree outperform B-Tree for simple check if a point is within a rectangle

For things like find nearest neighbors, I can undertand that R=Tree can outperform B-Tree. R-Tree can kick out more obviously false points. However, for simple check of a point in a rectangle, it's ...
1
vote
0answers
106 views

Why do we need myisam spatial extension anyway?

If just to determine whether a point is within a rectangle, What is wrong with this query? EXPLAIN SELECT DISTINCT TB.ID, TB.Latitude, TB.Longitude FROM TableBusiness AS TB WHERE ...
1
vote
1answer
169 views

What is the SQL command to get 20 closest points from some center location

There are 1.6 million rows. Must not compute distance for all rows. Spatial index is available This is the table structure. The name of the table is businessauxiliary. So yes I used MyIsam, added ...
0
votes
2answers
1k views

How do I get spatial index feature if I mainly use innodb?

My current strategy is to create another table in myisam that contains those spacial information. Then if I want to find 20 closest business, I'll just use join. Is this a good idea?
1
vote
1answer
2k views

Repair with keycache in mysql runs EVERY time. Can't even log why it's happening

I have a MyISAM table w/ ~1million rows and two indexes - one's a three-column key, and the other is a spatial index for bounded SELECT statements on a separate point column. My insert statements ...
8
votes
2answers
4k views

PostgreSQL vs. MySQL - Advantages / Disadvantages with a spatial component

We are the in the process of building out a web application that has a spatial data component. In the beginning our spatial data comparisons will take a given point and return matched overlapping ...