Solved

Storing coordinated in Postgresql

Posted on 2015-01-23
12
173 Views
Last Modified: 2015-01-29
Hi
I have got a dataset that includes Long/latitude and Easting/Northing; a few of the records look like this:
51.750365      -0.34032      514667      207044
51.563842      0.207556      553111      187305
51.69484      -0.386208      511636      200798
51.393646      -0.171873      527286      167653
51.42931      -0.500216      504362      171101
51.413846      -0.422078      509831      169495
51.660042      -0.405021      510420      196899
51.680993      0.009067      538996      199936

I have read that I should store these values as "points" in Postgresql but when I try to import from my excel spreadsheet where they are stored as "general", I get an error. I have also tried to store as a number and that didn't work either.

What is the best way to do this?
thanks
0
Comment
Question by:lz7cjc
  • 6
  • 5
12 Comments
 
LVL 40

Expert Comment

by:als315
ID: 40568011
0
 
LVL 62

Accepted Solution

by:
gheist earned 500 total points
ID: 40568611
PostGIS has all the geo data types builtin. Sure you can define your type, though why not take what somebody did for you...
0
 

Author Comment

by:lz7cjc
ID: 40570128
thanks - I agree but I can't work out how to use PostGIS! I have installed it but I can't find it (
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 
LVL 62

Expert Comment

by:gheist
ID: 40570405
0
 

Author Comment

by:lz7cjc
ID: 40570418
ok but if I am using the visual editor, pgadmin, where do I find that option in the table builder ->add column?
0
 
LVL 62

Expert Comment

by:gheist
ID: 40570422
It has extensions to default postgresql installation, like dll/so files.
you can also configure your own type of two floats, or plainly use 2 floats to record coordinates.
0
 

Author Comment

by:lz7cjc
ID: 40570460
Thanks for your help on this but I'm far from clear on what I'm meant to do. Please can you explain the steps, assuming I'm an idiot?
Thanks
0
 
LVL 62

Expert Comment

by:gheist
ID: 40570535
Either
1) add extensions of postgis to postgresql server (that lets you query distances form SQL)
2) define your own type of pair of floats
3) just add 2 float columns to store coordinates
0
 

Author Comment

by:lz7cjc
ID: 40570602
ok thanks - I am going to be feeding these coords into geomapping so it sounds like the float type will work. Will try that and let you know
0
 

Author Comment

by:lz7cjc
ID: 40570617
ummm - float doesn't exist as a data type in the drop down list in pgadmin

however Latitude and longitude are appearing as data types - so that would be the answer then!
0
 
LVL 62

Expert Comment

by:gheist
ID: 40570718
It is real or double precision.
real is accurate to 6 digits
double otherwise (like your example)
0
 

Author Closing Comment

by:lz7cjc
ID: 40578251
The types longitude and latitude appear automatically in the drop down list if postgis is installed
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Drop Down List with Unique/Distinct Values (Part II - ComboBox or ListBox and Data Validation List Bonus!) David Miller (dlmille) Intro This article focuses on delivering unique, sorted lists to list objects (e.g., ComboBox, ListBox) and Dat…
Do you use a spreadsheet like Microsoft's Excel?  Have you ever wanted to link out to a non excel file on your computer or network drive?  This is the way I found to do it!
This Micro Tutorial demonstrates using Microsoft Excel pivot tables, how to reverse engineer competitors' marketing strategies through backlinks.
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question