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Questions tagged [spatial]

Storing, querying, and indexing spatial data (including geometric and geographic representations).

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2
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2answers
2k views

migrate SQL Server geography data to PostGIS geometry data

I'm trying to use SSIS to transfer point data from a Geography column in SQL Server 2008 R2 to a geometry column in a Greenplum (Postgres 8.2.15) database with PostGIS. I know there's a way to do the ...
3
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1answer
2k 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 { ...
1
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1answer
4k 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
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1answer
2k 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. ...
3
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2answers
1k 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 = ...
7
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1answer
11k 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) ...
3
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3answers
1k views

Which graph database for search engine and gis? [closed]

I just learned there are "graph databases" out there, which are more suited for two applications "search engine" and especially "gis". To avoid discussions whether a relational DB is better suited ...
2
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2answers
339 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 ...
2
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1answer
439 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) ...
1
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3answers
168 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 ...
6
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2answers
605 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 `...
4
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1answer
905 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
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1answer
208 views

What database do most mobile start ups use? [closed]

mongodb? MySQL? PostgreSQL? If someone would add pluses and minus, let me know. Why I ask: I am a mobile startup. I need a database that supports spatial indexes. The spatial index must be able to ...
1
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0answers
112 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 -6....
2
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2answers
247 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
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2answers
2k 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?
2
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1answer
1k views

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

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 ...
5
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3answers
2k 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, provinces)...
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0answers
86 views

sdo_tune.quality_degradation returning negative values

While running the sdo_tune.quality_degradation function on one of our Oracle databases most of the results were around 1 but a number had values like -556127.225. Does this mean that these indexes ...
5
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1answer
263 views

Spatial data modelling tools [closed]

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 Model ...
15
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3answers
8k views

PostgreSQL vs. MySQL: spatial feature comparison

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 ...
2
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2answers
475 views

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

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: System....
2
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1answer
315 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 ...
6
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1answer
201 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 ...
6
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1answer
561 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 ...
9
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3answers
3k views

How does Yelp efficiently calculate distance in the database?

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, ...