1

I am trying to find the part of a LINESTRING between two points in SQL Server 2012 and am looking for how to approach it.

Here's one sample:

declare @point1 geometry, @point2 geometry, @line geometry, @pointbox geometry

set @point1 = geometry::STGeomFromText('POINT (-123.058499 38.918219)', 4326)
set @point2 = geometry::STGeomFromText('POINT (-123.097966 38.952692)', 4326)

set @line = geometry::STGeomFromText('LINESTRING (-123.057896 38.916655, -123.058085 38.916981, -123.058191 38.917187, -123.05834 38.917549, -123.058439 38.917878999999992, -123.05851100000001 38.918196999999992, -123.05852900000001 38.918371999999991, -123.05853 38.919007, -123.058507 38.919596999999996, -123.05840500000001 38.920535, -123.058318 38.921137, -123.058271 38.92132999999999, -123.058027 38.921942, -123.057883 38.922229999999992, -123.05775200000001 38.922447999999996, -123.057574 38.92269799999999, -123.05721100000001 38.923138999999992, -123.05684500000001 38.923541999999991, -123.055985 38.924552999999996, -123.055856 38.92472999999999, -123.055779 38.924872999999991, -123.05567700000002 38.925111999999991, -123.05563000000001 38.925221999999991, -123.05552800000001 38.925550999999992, -123.05545000000001 38.926024999999996, -123.055461 38.926546999999985, -123.05548 38.92671099999999, -123.05550900000001 38.926845, -123.05567100000002 38.927299999999995, -123.05605200000001 38.92789599999999, -123.060857 38.931855999999996, -123.061912 38.932839999999992, -123.062141 38.93324299999999, -123.062585 38.933886, -123.063613 38.93517099999999, -123.06504800000002 38.936489999999992, -123.065573 38.936972, -123.065974 38.93731, -123.066633 38.937771, -123.066931 38.937944, -123.06922399999999 38.939147999999996, -123.07014 38.93965, -123.070645 38.939865, -123.070882 38.939947, -123.071358 38.94005, -123.071444 38.940065, -123.071697 38.940104999999996, -123.07209399999999 38.940138999999995, -123.072876 38.940146, -123.073149 38.940141, -123.073685 38.940079, -123.07417 38.940056, -123.074686 38.940058, -123.074892 38.940062999999995, -123.075349 38.940107, -123.076005 38.940239999999996, -123.076525 38.940374, -123.07682299999999 38.94048, -123.077213 38.940638, -123.07753 38.940777, -123.077879 38.940945, -123.078031 38.941026, -123.07826 38.941165, -123.07865 38.941432, -123.078824 38.941565, -123.079113 38.94182, -123.079278 38.941983, 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-123.10485200000001 38.954937999999991, -123.105327 38.955131999999992, -123.10562200000001 38.955252999999992, -123.106221 38.955486, -123.106644 38.955678999999996, -123.10699000000001 38.95585899999999, -123.107292 38.956034999999986, -123.10745500000002 38.956130999999992, -123.108089 38.956580999999986, -123.10867 38.957090999999991, -123.108852 38.957246, -123.109121 38.957532, -123.109429 38.957837999999995, -123.11003099999999 38.958507999999995, -123.111364 38.959935, -123.111863 38.96047699999999, -123.112855 38.96152399999999, -123.11305 38.961736999999985, -123.11343600000001 38.962250999999995, -123.113589 38.96246399999999, -123.11388400000001 38.962958, -123.114154 38.963468999999996, -123.114545 38.964483999999992, -123.114895 38.96542, -123.114957 38.965585999999995, -123.115265 38.96644899999999, -123.115693 38.967596, -123.115814 38.967945, -123.115972 38.968354999999995, -123.116279 38.969280999999995, -123.11628400000001 38.969301999999992, -123.116445 38.970036, 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39.07782499999999, -123.178763 39.07819099999999, -123.179179 39.078775, -123.17938200000002 39.079104999999991, -123.179573 39.079439999999991, -123.18057 39.081265999999985, -123.18059199999999 39.081309999999995, -123.180633 39.081385999999995, -123.181648 39.083207, -123.181913 39.083704999999995, -123.182189 39.084182, -123.182527 39.084793999999995, -123.183104 39.085879999999996, -123.183393 39.086386999999995, -123.183519 39.086607999999991, -123.183883 39.08726, -123.184203 39.08782, -123.18448000000001 39.08834199999999, -123.185759 39.090658999999995, -123.18660300000002 39.092151999999992, -123.187138 39.093142, -123.187442 39.093675999999995, -123.188081 39.094865999999996, -123.18916000000002 39.096809999999991, -123.18948400000001 39.097394, -123.19000100000001 39.098244, -123.19081200000001 39.099578999999991, -123.191191 39.100141999999991, -123.19123 39.100197999999992, -123.19266400000001 39.102264, -123.19310999999999 39.10293, -123.193239 39.103138, -123.193524 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39.366140999999992, -123.315816 39.366441999999985, -123.315982 39.366706, -123.31630600000001 39.36713499999999, -123.31645 39.36731799999999, -123.31679700000001 39.367699999999985, -123.317078 39.367986999999985, -123.318692 39.369527999999995, -123.31942 39.370191999999996, -123.32026 39.37104, -123.321655 39.372355999999996, -123.322081 39.372754999999991, -123.322573 39.373184999999985, -123.323899 39.374209999999991, -123.32402800000001 39.374296999999991, -123.324281 39.37448599999999, -123.324538 39.374656, -123.325009 39.37492799999999, -123.325465 39.375161, -123.326018 39.37537, -123.326381 39.375474, -123.326883 39.375596, -123.327316 39.375668, -123.327597 39.375696, -123.32782 39.375709, -123.328283 39.375709, -123.32919 39.375648999999996, -123.329678 39.375645, -123.329745 39.375626)', 4326)
set @pointbox = geometry::STGeomFromText('POLYGON((-123.097966 38.918219, -123.058499 38.918219, -123.058499 38.952692, -123.097966 38.952692, -123.097966 38.918219))', 4326)

select @point1.STBuffer(0.001)
UNION ALL
select @point2.STBuffer(0.001)
UNION ALL
select @line as line

-- uncomment this to see the intersecting box
--UNION ALL
--select @pointbox

-- this only gets a subset of the line
--UNION ALL
--select @pointbox.STIntersection(@line)

I have a source LINESTRING, and two points that intersect it somewhere. I would like to find and return only the part of the LINESTRING between those two points. Originally I thought I could do something like finding the minimum box containing those two points, then do the intersection of that, but as shown in the example above that doesn't take into account where the line goes beyond the limits of the box.

I've think I've seen that PostGIS has some sort of line substring function, but haven't been able to find the same for SQL Server. If it helps, I'm working in .NET as well and so if there's something in the SqlGeometry classes in C# I could work with that, too. Is there some sort of known algorithm I could follow to find what I'm looking for?

1

After some more thought and digging I think I've come up with a workable process for this that I wanted to share. I ended up walking my original linestring sublinestring by sublinestring, and testing if my points intersect that. Then I build a new linestring starting with my first point, adding each subsequent point along the original linestring, and ending with my second point. Here's the SQL implementation; I coded it in .NET, too, adding handling to determine which of my two points is "first" so that the order is correct.

declare @point1 geometry, @point2 geometry, @line geometry, @pointbox geometry

set @point1 = geometry::STGeomFromText('POINT (-123.058499 38.918219)', 4326)
set @point2 = geometry::STGeomFromText('POINT (-123.097966 38.952692)', 4326)

set @line = geometry::STGeomFromText('LINESTRING (-123.057896 38.916655, -123.058085 38.916981, -123.058191 38.917187, -123.05834 38.917549, -123.058439 38.917878999999992, -123.05851100000001 38.918196999999992, -123.05852900000001 38.918371999999991, -123.05853 38.919007, -123.058507 38.919596999999996, -123.05840500000001 38.920535, -123.058318 38.921137, -123.058271 38.92132999999999, -123.058027 38.921942, -123.057883 38.922229999999992, -123.05775200000001 38.922447999999996, -123.057574 38.92269799999999, -123.05721100000001 38.923138999999992, -123.05684500000001 38.923541999999991, -123.055985 38.924552999999996, -123.055856 38.92472999999999, -123.055779 38.924872999999991, -123.05567700000002 38.925111999999991, -123.05563000000001 38.925221999999991, -123.05552800000001 38.925550999999992, -123.05545000000001 38.926024999999996, -123.055461 38.926546999999985, -123.05548 38.92671099999999, -123.05550900000001 38.926845, -123.05567100000002 38.927299999999995, 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declare @tp1 geometry, @tp2 geometry, @tlinestring geometry
declare @wkt varchar(max)

declare @capturepoint1 int, @capturepoint2 int
set @capturepoint1 = -1
set @capturepoint2 = -1

declare @iterator int
set @iterator = 1

while @iterator <= @line.STNumPoints()
BEGIN
    print cast(@iterator as varchar) + ' ' + @line.STPointN(@iterator).STAsText()

    -- generate linestring of current point to next point, test if point1 or point2 intersects
    IF @iterator < @line.STNumPoints() -- don't add one on the last point
    BEGIN
        set @wkt = 'LINESTRING (' 
        + REPLACE(REPLACE(@line.STPointN(@iterator).STAsText(),'POINT (',''),')',',') 
        + REPLACE(REPLACE(@line.STPointN(@iterator + 1).STAsText(),'POINT (',''),')','') 
        + ')'

        set @tlinestring = geometry::STGeomFromText(@wkt, 4326)

        -- capture first intersection of point 1, last intersection of point 2, 

        IF @point1.STBuffer(0.001).STIntersects(@tlinestring) = 1
        BEGIN
            print 'point1 intersects line segment: ' + @tlinestring.STAsText()
            IF @capturepoint1 = -1
            BEGIN
                set @capturepoint1 = @iterator + 1
            END
        END

        IF @point2.STBuffer(0.001).STIntersects(@tlinestring) = 1
        BEGIN
            print 'point2 intersects line segment: ' + @tlinestring.STAsText()
            set @capturepoint2 = @iterator
        END
    END


    set @iterator = @iterator + 1
END

select @capturepoint1, @capturepoint2

-- Assemble the new linestring!

set @iterator = @capturepoint1

-- first point is the original point 1
set @wkt = 'LINESTRING (' 
        + REPLACE(REPLACE(@point1.STAsText(),'POINT (',''),')',',') 

while @iterator <= @capturepoint2
BEGIN
    set @wkt = @wkt 
        + REPLACE(REPLACE(@line.STPointN(@iterator).STAsText(),'POINT (',''),')',',') 

    set @iterator = @iterator + 1
END

set @wkt = @wkt 
        + REPLACE(REPLACE(@point2.STAsText(),'POINT (',''),')','') 
        + ')'


declare @finalgeom geometry
set @finalgeom = geometry::STGeomFromText(@wkt, 4326)

select @finalgeom

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