?
Solved

check if  a point is in the polygon in mssql

Posted on 2009-05-14
15
Medium Priority
?
821 Views
Last Modified: 2012-05-07
I have two tables. one table with geographic information latitude and longitude. The other table contain polygon information. The polygon information is also in latitide and logitude. Do somebody have source code how to do that calculation in mssql.
0
Comment
Question by:erwingosepa
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 8
  • 5
15 Comments
 

Author Comment

by:erwingosepa
ID: 24386575
I need to check if the point is within the polygon, not the distance
0
 
LVL 41

Expert Comment

by:ralmada
ID: 24387035
Can you post an example of what are you looking for? I'm sure the function I've showed you can make the trick.
 
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:erwingosepa
ID: 24389184
May be I forgot to mention that the code should be for inregular polygons.
0
 
LVL 41

Expert Comment

by:ralmada
ID: 24390601
Again, please provide an example with dummy data, so I can provide you with an answer.
0
 
LVL 41

Expert Comment

by:ralmada
ID: 24390863
0
 

Author Comment

by:erwingosepa
ID: 24391188
The poligon information is the following:
point              longitude                            latitude
0      -64.042559081072355      23.234263809565476
1      -57.681113297939824      29.30655296619198
2      -41.488342213602479      26.921010797517283
3      -41.849787996735003      25.258360195107642
4      -53.705209683481989      27.282456580649814
5      -53.416053056975969      23.667998749324511
6      -48.283522936494037      22.800528869806438
7      -48.138944623241031      24.969203568601621
8      -42.138944623241031      24.174022845710052
9      -42.428101249747051      18.535468628842583
10      -52.83773980396392      20.487275857758245
11      -56.018462695530182      23.812577062577525
12      -56.018462695530182      27.571613207155835
13      -57.464245828060307      27.571613207155835
14      -59.343763900349458      25.258360195107642
15      -62.090751852156693      22.005348146914873

I want to know if point latitude 24.877956 longitude -54.456652 is within the polygon.
Do have code in stored procedure or function that can chec in the point is in the polygon?
0
 
LVL 41

Accepted Solution

by:
ralmada earned 2000 total points
ID: 24391825
You will have to use CLR functions. Please check this link (Query 4 - advanced topics).
http://msdn.microsoft.com/en-us/library/aa964138(SQL.90).aspx#tblvalfuncsql_topic8 
and this link to learn how to install the Spatial library:
http://msdn.microsoft.com/en-us/library/ms345264(SQL.90).aspx 
0
 

Author Comment

by:erwingosepa
ID: 24421861
point = latitude 24.877956 longitude -54.456652

CREATE TABLE [Polygon] (
      [PolygonID] [int],
      [PointNum] [int],
      [Lat] [numeric](10, 6),
      [Lon] [numeric](10, 6)
)
What I need to do, is come up with a script that will determine which Polygon contains each point. I'd like to be able to assign a PolygonID to each record in the Point table, or give it a 0 if there is no polygon that contains that point.
I'm looking for a way to do this within SQL Server (or possibly with the use of an extended stored procedure if necessary).
0
 
LVL 41

Expert Comment

by:ralmada
ID: 24422175
I'm not an expert in geography, so I will need your help here. In the example provided, can you explain in English how do I know if that point is in that polygon?
 
0
 

Author Comment

by:erwingosepa
ID: 24422999
that is exacly what I'm asking to solve. I do have examples in other program languages but not as function or stored procedure in mssql.
0
 
LVL 41

Expert Comment

by:ralmada
ID: 24423261
Yeah, but in order for me to produce an algorithm I need to understand the logic of your problem. That's why I'm asking you to explain in English (not in SQL) how do I know whether a point is in one polygon or not.
Also, have you checked the spatial functions I've posted above? There's a specific CLR function that check point in polygon. Have a look again.
0
 
LVL 41

Expert Comment

by:ralmada
ID: 25576239
AngelIII I disagree. I have indicated that to do this the asker will need to use the Spatial library in comment http:#a24391825
0

Featured Post

Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

Question has a verified solution.

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

Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
In this article we will learn how to fix  “Cannot install SQL Server 2014 Service Pack 2: Unable to install windows installer msi file” error ?
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
Via a live example, show how to setup several different housekeeping processes for a SQL Server.
Suggested Courses

777 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