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2009/8/23 Itzchak Raiskin itzchak.rais...@gmail.com:
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with all heights point along this
On 23/08/2009 3:08 PM, Itzchak Raiskin wrote:
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with all heights point along this line.
On Sun, 23 Aug 2009, Itzchak Raiskin wrote:
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height). I would like to query this
database with start and end points of a line and get a vector with all
heights point along this line. I
On Sun, Aug 23, 2009 at 01:08, Itzchak Raiskin itzchak.rais...@gmail.comwrote:
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with
On Sun, Aug 23, 2009 at 12:08 AM, Itzchak
Raiskinitzchak.rais...@gmail.com wrote:
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with
On 23 Aug 2009, at 5:00pm, P Kishor wrote:
WHERE a*x - y + c = 0
Here's the problem. This works only when the equation is exact.
Which under normal circumstances means that all the numbers fit neatly
with some imaginary integer formula. This isn't how real life works,
especially when
Itzchak Raiskin wrote:
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with all heights point along this line.
I can, of course
On Sun, Aug 23, 2009 at 11:11 AM, Simon
Slavinslav...@hearsay.demon.co.uk wrote:
On 23 Aug 2009, at 5:00pm, P Kishor wrote:
WHERE a*x - y + c = 0
Here's the problem. This works only when the equation is exact.
Indeed. We already laid out those presumptions. One, your height
coverage has to
On Sun, Aug 23, 2009 at 11:34 AM, P Kishorpunk.k...@gmail.com wrote:
On Sun, Aug 23, 2009 at 11:11 AM, Simon
Slavinslav...@hearsay.demon.co.uk wrote:
On 23 Aug 2009, at 5:00pm, P Kishor wrote:
WHERE a*x - y + c = 0
Here's the problem. This works only when the equation is exact.
Indeed.
On Sun, Aug 23, 2009 at 12:08 AM, Itzchak
Raiskinitzchak.rais...@gmail.com wrote:
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with
2009/8/23 P Kishor punk.k...@gmail.com:
If a line is expressed by (y = ax + c), you need to find all x,y that
will satisfy that equation. So,
SELECT x, y, z
FROM terrain
WHERE a*x - y + c = 0
General equation of line is a*x + b*y + c = 0. If you delete parameter
b, you will have a problem
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a
line and
get a vector with all heights point along this line.
I can, of course create a query for each point along
Hi
I want to use SQLite in a GIS application where I create a database
containing terrain data (coordinates, height).
I would like to query this database with start and end points of a line and
get a vector with all heights point along this line.
I can, of course create a query for each point
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