A spatial data infrastructure (SDI) is a data infrastructure implementing a framework of geographic data, metadata, users and tools that are interactively connected in order to use spatial data in an efficient and flexible way.

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10
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3answers
951 views

Can spatial index help a “range - order by - limit” query

Asking this question, specifically for Postgres, as it has good supoort for R-tree/spatial indexes. We have the following table with a tree structure (Nested Set model) of words and their ...
8
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2answers
1k views

How do Application Like Yelp Retrieve distance information from data base efficiently

For example, say I have a table: Business(BusinessID, Lattitude, Longitude) All are indexed of course. Also there are 1 million records Say I want to find businesses closest to 106,5, for example, ...
8
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2answers
5k 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 ...
6
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2answers
347 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 ...
6
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1answer
5k 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. ...
6
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1answer
348 views

Permission to create Spatial Index

Permissions required to create a Spatial Index on a table, for this BOL says: Requires ALTER permission on the table or view. User must be a member of the sysadmin fixed server role or the ...
5
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1answer
5k 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) ...
4
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2answers
89 views

Spatial index not used

I have a table with a geometry column. For one record, there is only one Point stored. A spatial index has been created but queries searching for the nearest location do not use this index resulting ...
4
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1answer
244 views

T-SQL and GPS co-ordinates

I'm looking to store GPS co-ordinates in an MS SQL Server DB for location matching of users with GPS-enabled mobile phones. I've read about STDistance on MSDN, but it only appears to exist in SQL ...
4
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1answer
167 views

Spatial data modelling tools

Is there anything like MySQL workbench for PostGIS? Something that supports SQL output and geometry types would be nice. CLARIFICATION: I am trying to implement the Land Administration Domain ...
3
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1answer
360 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 ...
3
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3answers
511 views

Which graph database for search engine and gis?

I just learned there are "graph databases" out there, which are more suited for two applications "search engine" and especially "gis". To avoid discussions weather a relational DB is better suited ...
3
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1answer
520 views

How to correctly return a query result only if it isn't NULL?

I'm writing a PL/pgSQL function that creates a cursor for a query that I need to check whether it returns something. What I'm doing is this: Run the query Check whether it returns something. If it ...
3
votes
1answer
81 views

Non-overlapping rectangles constrained to a boundary

I am trying to model placement of parts on a circuit board. Without any meaningful constraints, my basic schema looks like this: create table part ( part_id bigserial primary key, name text ...
3
votes
1answer
99 views

Good layout of 3d point data for spatial queries in Postgres?

Like shown in another question, I deal with a lot (>10,000,000) entries of points in a 3D space. These points are defined like this: CREATE TYPE float3d AS ( x real, y real, z real); If I am ...
3
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1answer
448 views

Insert performance with Geography column

I've been tasked with inserting data into a SQL Server table with a geography column. I've found that my times for doing inserts (same data 1.5 million rows) go up increasingly. I started out with no ...
3
votes
1answer
805 views

MongoDB geospatial query with sort - performance issues

I have query (which is very slow ~2,5s): db.markers.find({ latlng: { '$within': { '$box': [ [ -16, -140 ], [ 75, 140 ] ] } } }).sort({_id: -1}).limit(1000) When I run explain for this query I get ...
3
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1answer
153 views

SQL Server - Using spatial data

I'm using SQL Server 2008 R2 for real-time location aware service. The service mostly receives location data (lat/lon) from a user and returns locations around the user. The data is being sent from ...
3
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3answers
704 views

How do I design a database for continents, countries, regions, cities and POIs?

I am not a database designer so I'm having trouble designing database with GIS information. The goal is to create a system with continents, countries, regions (including states, sub-regions, ...
3
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0answers
62 views

sql server spatial index performance

I have a table with around 2 million records in it. I created a spatial index, using the defaults other than the bounding box. I've been noticing that some queries are extremely fast, and some are ...
3
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0answers
152 views

SQL Server 2012 STIntersects

I have one table, T_PIN, with 300,000 pins and another, T_POLYGON, with 36,000 polygons. T_PIN has this index : CREATE SPATIAL INDEX [T_PIN_COORD] ON [dbo].[T_PIN] ( [Coord] )USING GEOGRAPHY_GRID ...
2
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2answers
562 views

Error updating sql server geography type in trigger

I have the following trigger in my database: CREATE TRIGGER dbo.triggerGeocodedAddressUpdate ON dbo.Party AFTER UPDATE AS IF UPDATE(Latitude) UPDATE pt SET pt.GeocodedAddress = ...
2
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1answer
270 views

Creation of spatial index locks the table for hours

I used this code to create a spatial index in SQL Server 2008 R2: BEGIN TRANSACTION SET QUOTED_IDENTIFIER ON SET ARITHABORT ON SET NUMERIC_ROUNDABORT OFF SET CONCAT_NULL_YIELDS_NULL ON SET ANSI_NULLS ...
2
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1answer
259 views

Can geography datatype Lat/Long properties be returned using a view in SQL Server 2008?

Hopefully the question is fairly self-explanatory. I've been ferreting through the, what appears to be quite minimal/poor microsoft documentation regarding both views and geography datatypes in the ...
2
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1answer
16 views

How to get the spatial index in CREATE TO script?

Is it possible to get the spatial index using the create to script using SQL Server 2012? When I write out a table using SCRIPT TABLE AS > CREATE TO in Microsoft SQL Server Management Studio 2012, I ...
2
votes
1answer
649 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 ...
2
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1answer
431 views

Visualiser for spatial query results

This question Whats the easiest way to get sql 08 spatial data onto a map? (and many other articles) recommends Craig Dunn's Geoquery, but all the download links appear to be kaput. SQL Server ...
2
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1answer
290 views

Problem with shortest distance calculation in PostGIS

While working with PostGIS pgrouting, for calculating the distance between two roads (lines) I'm using the shortest_path function. The logic is based on start_point(Start_id) and end_point(end_id) ...
2
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1answer
565 views

How to store GPS coordinate and search places in a radius from a NoSQL DBMS (like DynamoDB)

My team need a DBMS like DynamoDB to store large amount of data, principally places and coordinates. I've considered to use some GIS-based DBMS (like PostGIS) with an index on the POINT, but DynamoDB ...
2
votes
2answers
303 views

How do I set a geography point to be the North Pole?

I tried to execute this query on my SQL Server 2008 R2 instance: UPDATE ITEMS SET GEOG=geography::STPointFromText('POINT(0 90)', 4326); SQL Server returned the following error: ...
2
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0answers
42 views

Optimise query: find items that are geographically touching, but without association

I have a very specific problem, I am not entirely sure if this is the right place to ask this question. From our client we get data submitted to us, and to verify the quality of that data, we run a ...
2
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0answers
33 views

ST_GeomFromGeoJSON() Causes postgres to crash

I'm running into a strange problem which I can't solve. The server crashes when executing some postgis related queries. After some debugging, using the examples provided by postgis, it appears the ...
2
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1answer
167 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 ...
2
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0answers
169 views

Geographic Hierarchies in a OLAP Cube / Data Warehouse

Are the following geographic hierarchies correct? Do any US/Canadian area codes cross state/province lines? Do any US/Canadian counties cross state/province lines? Are there countries with counties ...
1
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2answers
279 views

PostgreSQL : Is this because of locks(row level)?

I have a table with approximately 2.1 million tuples. Which has latitude and longitude columns. I am trying to convert this into a geographic type (point with SRID). The function(procedure) I have ...
1
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1answer
814 views

$nearSphere returns too many data. What am I missing? Am I wrong? Is it a bug? Does other see the same thing?

I noticed that $near and $nearSphere returns completely different data and I got suspicious. After all, when latitude is near equator it sphere distance shouldn't differ a lot from euclidean distance. ...
1
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2answers
92 views

how to design a database's table to store mysql spatial data in a parent child relation?

I want to store locations and polygon data in a parent-child relationship. I am using spatial data in MySQL and Google maps for polygon. Examples: 1. World 1.1 US 1.2 China 1.3 Japan 1.4 South ...
1
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2answers
1k views

What is best way to storing geo coordinates related to planned route?

Here is my scenario: Application "A" produces lat and long points that correspond to planned route. Depending on route distance it could have several thousands of points. I know of Geography and ...
1
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1answer
263 views

Geohash implementation in PostgreSQL

Are there any geohash implementation for PostgreSQL? I couldn't find any.
1
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2answers
114 views

Trying to create PostGIS database

I am trying to create a spatially enabled PostGIS database by following the PostGIS documentation. In the short version, i executed, createdb yourdatabase createlang plpgsql yourdatabase But I did ...
1
vote
1answer
41 views

Spatial Index ignored when using additional non-spatial conditions

Why does SQL Server ignore my spatial index when I use additional conditions? If I add an INDEX hint it will use the correct index, and runs a lot faster. I would like to avoid using the hint if ...
1
vote
1answer
57 views

Spatial Loader DB2 giving error while importing shape file

While I am trying to import a shapefile using db2se import_shape file utility, db2se import_shape <dbname> -userId <userid> -pw <password> -fileName ...
1
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1answer
641 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 ...
1
vote
1answer
563 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 ...
1
vote
1answer
1k views

Convert spatial points data to line data for use in Line Layer in SQL Server Reporting Services (SSRS)

I have a query that returns the fields Order, Lat, Long, SpatialData, <OtherStuff>. SpatialData is a point. I want to create a line layer that draws lines between my points based on the order ...
1
vote
1answer
187 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 ...
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0answers
74 views

How to take advantage of multiple spatial indices?

All, I'm building a view which uses a spatial intersect (STIntersect in MSSQL 2012) between points (student addresses with address information) and polygons (school boundary polygons with school ...
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0answers
38 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 ...
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0answers
126 views

Is there are way to use Fine Grain Auditing to record Varray bind values?

I have an application, and would like to use Oracle's FGA (Fine Grained-Auditing) to record varray bind information. Specifically, I am using Oracle Spatial and need to know at what extent users are ...
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0answers
147 views

What are some light-weight clients of SQL Server 2012 that can utilize SQL spatial functions? [closed]

We're building our new enterprise database and it will include SQL server spatial (native) data (moved from ArcSDE). This is great news for our SQL analysts who will now be able to consume our spatial ...