Solved

Storing coordinated in Postgresql

Posted on 2015-01-23
12
166 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 39

Expert Comment

by:als315
ID: 40568011
0
 
LVL 61

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
 
LVL 61

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 61

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
Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

 

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 61

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 61

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

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Drop Down List with Unique/Distinct Values (enhancing the Combo-Box with a few steps and a little code) David miller (dlmille) Intro Have you ever created a data validation list from a database field or spreadsheet column (e.g., Zip Codes or Co…
Dealing with unintended Excel Active-X resizing quirks (VBA code simulates "self correction") David Miller (dlmille) Intro Not everyone is a fan of Active-X controls in spreadsheets (as opposed to the UserForm approach, the older Form controls …
The viewer will learn how to use a discrete random variable to simulate the return on an investment over a period of years, create a Monte Carlo simulation using the discrete random variable, and create a graph to represent the possible returns over…
This Micro Tutorial will demonstrate how to create pivot charts out of a data set. I also added a drop-down menu which allows to choose from different categories in the data set and the chart will automatically update.

760 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

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now