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I created a polygon as follows

create table boundary (id int, name text);

table created;

select AddGeometryColumn ('',boundary', 'latlon' 4326,'POLYGON', 2);

geometry column added;

then i'm trying to insert values as follows

INSERT INTO boundary (id , name, latlon) VALUES ('1', 'river', GeometryFromTerxt('POLYGON(82.240 16.988,82.243 16.991,82.240 16.988)', 4326));

finally i got an error as follow

<--parse error at position (position number) within geometry.

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GeometryFromTerxt is spelt wrong? is that what you actually entered? –  iant Oct 22 '12 at 12:23
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Also 3 points isn't enough to form a valid polygon, you need a minimum of 4 points. –  iant Oct 22 '12 at 12:24
    
The value of "position number" would be useful, but if your code here is a faithful representation of what you actually did, I would focus on the typo in "Terxt" :-). –  whuber Oct 22 '12 at 15:27
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1 Answer 1

As commenters point out

  • You need 4+ points to form a closed polygon
  • The first and last point must be the same
  • Polygons can contain multiple rings, so you need two (()) brackets around your exterior ring point list

For example, the unit square

POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))
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Thank you very much "Paul Ramsey" finally I created a polygon. My mistake is as you mentioned missing of two braces in POLYGON Feature. –  satya chandra Oct 23 '12 at 4:18
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