sqlspatialtools Forum Rss Feed

New Post: Project Status

Bigjimslade — Mon, 28 Jan 2013 18:57:02 GMT

ok great I was trying to use the KML Features and it looks like there is a minoor issue with using it I think i have a fix would it be possible to get added as a developer?

Thanks.

New Post: Project Status

edwink — Mon, 28 Jan 2013 18:54:05 GMT

We’ve just finished rolling up most of the features in this project into SQL Server 2012 and are now doing the same for the Windows Azure SQL Database (formerly SQL Azure). This project will remain active on CodePlex while we determine what features to add next after we finish the SQL and Azure synchronizations.

From: Bigjimslade [email removed]
Sent: Monday, January 28, 2013 10:44 AM
To: Ed Katibah
Subject: Project Status [sqlspatialtools:431141]

From: Bigjimslade

What is the status of this project? is anyone still doing active development?

New Post: Project Status

Bigjimslade — Mon, 28 Jan 2013 18:44:01 GMT

What is the status of this project? is anyone still doing active development?

New Post: Showing two spatial columns in the spatial results together

Viking42 — Fri, 30 Nov 2012 07:50:22 GMT

works like a charm!

Thank you very much

New Post: Showing two spatial columns in the spatial results together

edwink — Wed, 28 Nov 2012 18:16:02 GMT

You could try something like this:

select top 100 geography::Point(ddLatitude, ddLongitude, 4326) as point, geom into #foo

from Area, Position

where geography::Point(ddLatitude, ddLongitude, 4326).STIntersects(Area.geom) = 0

select point.STBuffer(1000) from #foo

union all

select geom from #foo

The general approach would be to populate a temporary table with the output from the select (into #foo). Then you can logically merge the two spatial columns in #foo using the union all command.

Note the simplified point constructor, Point(). When you are using the geography type and the Point() method in argument list is LATITUDE, LONGITUDE, SRID.

Please let us know if this answers your question.

Thanks,

-Ed

From: Viking42 [email removed]
Sent: Wednesday, November 28, 2012 8:44 AM
To: Ed Katibah
Subject: Showing two spatial columns in the spatial results together [sqlspatialtools:404916]

From: Viking42

Hi,

I am new to this and I have some geo points that does not intersects with my geo structures and I want to plot these and see where these points are in order to debug the solution.

I run the following query in MS SQL management studio:

select

top 100

geography::STPointFromText('POINT(' + CAST(ddLongitude AS VARCHAR) + ' ' + CAST(ddLatitude AS VARCHAR) + ')', 4326)

,geom

from Area, Position

where

geography

::STPointFromText('POINT(' + CAST(ddLongitude AS VARCHAR) + ' ' + CAST(ddLatitude AS VARCHAR) + ')', 4326).STIntersects(Area.geom) = 0

I can switch between the two columns in the Spatial Results window but I want to see the points and my shapes together. Is there a way to do this?

Thank you for your replies

New Post: Showing two spatial columns in the spatial results together

Viking42 — Wed, 28 Nov 2012 16:43:33 GMT

Hi,

I am new to this and I have some geo points that does not intersects with my geo structures and I want to plot these and see where these points are in order to debug the solution.

I run the following query in MS SQL management studio:

select

top 100

geography::STPointFromText('POINT(' + CAST(ddLongitude AS VARCHAR) + ' ' + CAST(ddLatitude AS VARCHAR) + ')', 4326)

,geom

from Area, Position

where

geography

::STPointFromText('POINT(' + CAST(ddLongitude AS VARCHAR) + ' ' + CAST(ddLatitude AS VARCHAR) + ')', 4326).STIntersects(Area.geom) = 0

I can switch between the two columns in the Spatial Results window but I want to see the points and my shapes together. Is there a way to do this?

Thank you for your replies

New Post: Project to UTM - long0 values

kaveh096 — Wed, 29 Feb 2012 01:59:37 GMT

Don't know if this issue is still valid... I'm simply posting for the sake of future reference. I had some WSG 1984 geographies which needed to be projected into UTM on run-time using TranverseMercator. So I used this SqlSpatialTools library like adair but the numbers did not exactly matched after compering to ESRI ArcGIS outputs. So I found this page (http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html) and based on the javascript implementation, coded a C# class within the SQLSpatialTools framework to take care of it. Now, does anyone knows how I can submit this new class (patch files) to the project admins?

New Post: C# library for converting geom field of SQLServer into set of google latlng

Mustafa646 — Fri, 03 Feb 2012 12:55:55 GMT

Is there any C# library which can convert the geometry field into set of google latlngs? I have stored a shapefile into SQLserver table. From Sqlserver i want to read the geometry field data and want to convert this geom data into set of google latlngs in my C# application. Finally i want to save these google latlngs into another table in SQLServer.

New Post: NuGet package?

jalbert — Wed, 25 Jan 2012 21:56:12 GMT

A NuGet package would be very useful to us. I think NuGet has enough momentum behind it by now...

New Post: Conversion of State Plane to WGS84

alembic6 — Mon, 23 Jan 2012 15:26:30 GMT

Ed -

Thank you very much for the comprehensive answer and your suggestions for further avenues of pursuit! I very much appreciate your time and effort. I'll look into FME Microsoft SQL Server Data Loader Edition.

Warmest regards,

Joel

New Post: Conversion of State Plane to WGS84

edwink — Sat, 21 Jan 2012 00:41:13 GMT

@alembic6

As you have discovered, SQL Server Spatial does not offer any coordinate projection/transformation methods as part of the core offering. There are several reasons for this which I won’t delve into here. The coordinate system projection code provided in the CodePlex SQL Server Spatial Tools Project is designed as working examples of how this might be done but will not, in themselves, solve this particular problem for you. There are several alternatives. First, you could, using the CodePlex sample code as a framework, create new CLR-based T-SQL functions to do this task. The algorithms are well known and published on the Internet in a variety of places. Or you could use the Proj.4 library available from OSGeo along with some CLR-code to create some new T-SQL functions. Or you could purchase the Feature Manipulation Engine (FME) from Safe Software. If you are not familiar with FME but are interested in this approach, I would suggest that you avail yourself of the US$500 package, FME Microsoft SQL Server Data Loader Edition (please check with Safe Software for current pricing). All FME editions allow you to easily and efficiently project coordinates and perform datum transformations. Lastly, you could check with Blue Marble Geographics and see what they have to offer. I have not worked with their product but there has been some discussion with them on this subject.

Let us know if this information assists you or if you need addition guidance.

Thanks,

-Ed

From: alembic6 [email removed]
Sent: Friday, January 20, 2012 4:07 PM
To: Ed Katibah
Subject: Conversion of State Plane to WGS84 [sqlspatialtools:286893]

From: alembic6

I am trying to find the correct T-SQL code to convert X,Y State Plane coordinates (NAD83) to WGS84 coordinates. I have successfully installed SQL Spatial Tools and I have searched these discussion topics for assistance, but I am unable to assist myself. Can anyone point me in the right direction? Which function(s) should I use and how? I have a large table with X,Y values stored as integers. Thank you in advance for your assistance!

New Post: Conversion of State Plane to WGS84

alembic6 — Sat, 21 Jan 2012 00:07:02 GMT

New Post: wgs84 lat/longs to web mercator projection

kraghavk — Sun, 08 Jan 2012 08:09:44 GMT

Hi,

I am storing data as Geometry. However, the Project method seems to accept only Geography type. So, I changed the above T-SQL a bit to suit to my needs. Below is a sample script performing re-projection to one Polygon.

DECLARE @geom Geometry;
SET @geom = Geometry::STGeomFromText('POLYGON ((77.9672499974569 13.3208888689677, 77.968444442749 13.320666662852, 77.9683610916138 13.3203333218892, 77.9671388626099 13.3205555597941, 77.9672499974569 13.3208888689677))', 4326)

-- Correct the ring orientation if it is incorrect
-- SqlGeography, unlike SqlGeometry data type is very unforgiving
-- This will force a validation of the Spatial object and correct the ring orientation internally
-- For more info see: http://blogs.msdn.com/b/edkatibah/archive/2008/08/19/working-with-invalid-data-and-the-sql-server-2008-geography-data-type-part-1b.aspx
SET @geom = @geom.STUnion(@geom.STStartPoint());

DECLARE @geography Geography
SET @geography = Geography::STGeomFromText(@geom.STAsText(),@geom.STSrid)

DECLARE @mercator Projection;
SET @mercator = Projection::Mercator(0)

SELECT 
	@geom.STAsText() AS WGS84,
	@mercator.Project(@geography).STAsText() AS WebMercator

However, the values I get are totally off! Here is what I get:

Original Geometry: POLYGON ((77.968361091625411 13.320333321884391, 77.968444442754844 13.32066666285391, 77.967249997454928 13.320888868969632, 77.967138862615684 13.320555559796048, 77.968361091625411 13.320333321884391))

Re-projected Geometry: POLYGON ((1.3608046134327036 0.23460666206021522, 1.3608060681843475 0.23461264080687308, 1.3607852211811289 0.2346166262623624, 1.3607832815122705 0.23461064808050117, 1.3608046134327036 0.23460666206021522))

I am not able to figure out what I am doing wrong. Any help will be great.

Thanks in advance.

Regards,
Raghu

New Post: Conversion from ("non-vacuous") geography to geometry

StJohnKettle — Thu, 10 Nov 2011 01:19:53 GMT

There seems to be an asymmetry in the spatial tools provided. Given a geometry with an SRID we can convert to a geography with the same SRID using MakeValidGeographyFromGeometry What about the reverse process? There is a symmetric pair of functions for conversion when the items are "vacuous", which I >think< means that they have no SRID. There is also an asymmetry in the spatial aggregations: we have GeographyUnionAggregate but no GeometryUnionAggregate. Is this forthcoming or it is redundant?

New Post: Put two countries together

Lannerstone — Thu, 08 Sep 2011 21:39:35 GMT

GREAT Ed!

How wonderful to take giant steps in the development with your help!

It works perfect!

Best regards, Joakim

New Post: Put two countries together

edwink — Thu, 08 Sep 2011 15:03:44 GMT

Hi Joakim -

>I wan't to combine two separate geo-structures like Canada and US into one geo-area.

Basically, what you want to create is an aggregate. There are several ways to do this. You can do this easily with two spatial objects at a time using the STUnion() method:

DECLARE @us GEOGRAPHY = (SELECT geog FROM COUNTRIES WHERE name = 'US');
DECLARE @canada GEOGRAPHY = (SELECT geog FROM COUNTRIES WHERE name = 'Canada');
SELECT @us.STUnion(@Canada);

For SQL Server 2008, a more flexible way to do this would be to use the GeographyUnion() function in the CodePlex SQL Server Spatial Tools Project:

SELECT GeographyUnionAggregate(geog) FROM Countries WHERE name in ('US', 'Canada');

For SQL Server Code-Named "Denali" (currently available as Denali CTP3), there is a new built-in aggregate, UnionAggregate, which supports this operation:

SELECT GEOGRAPHY::UnionAggregate(geog) FROM Countries WHERE name in ('US', 'Canada');

>Another function I would like to see is the opposite: Split one region into two. But i think that one is thouger to manipulate.

You can functionally do this a number of ways but I would encourage you to investigate the STIntersection() method.

I hope this help,

- Ed

New Post: Put two countries together

Lannerstone — Thu, 08 Sep 2011 14:05:08 GMT

Hi!

I'm a newbie in spatial data and maybe this is a very easy (stupid) question...

I wan't to combine two separate geo-structures like Canada and US into one geo-area.

Is there a function for this? Or is it a programatic way to solve it ?

Another function I would like to see is the opposite: Split one region into two. But i think that one is thouger to manipulate.

Best regards, Joakim

New Post: How to translate WGS 84 to Equirectangular?

yaakovd — Mon, 05 Sep 2011 18:38:19 GMT

I have a SqlGeogrpahy instance in my .Net application initialized to long, lat of 10,10. I wish to convert those to equirectangular planar coordinates.

SqlProjection.Equirectangular expects "longitude0" and "parallel" parameters. What do those parameters represent, and how to determine their values?

Regards,

New Post: Translate WGS84 to Mercator Projection

sneha_783 — Sun, 04 Sep 2011 12:15:32 GMT

Thanks for your reply.

I am using ASP Maps. The Lat/Lon co-ordinate for a specific area or specific point on my map is different from that on Google maps. So I want to convert the Lat/Lon co-ordinates on ASP Maps(WGS84 Projection) to that of Google Maps(Mercator Projection). How can I do that. If I am wrong somewhere Please correct me and suggest me what I should do.

New Post: Translate WGS84 to Mercator Projection

edwink — Fri, 02 Sep 2011 19:12:36 GMT

@sneha_783

You'll have to provide a little more clarification. WGS84 lat/lon coordinates are spherical units. Mercator is a type of map projection whose coordinates are specified as Eastings and Northings - X and Y coordinates - unlike your reference to "mercator lat/long co-ordinates". I'm presuming that you really want your WGS84 lat/long coordinates transformed in the server to "some" Mercator projection. Additionally, based on the question you posed on the wgs84 lat/longs_web mercator discussion, I'll presume you want the Web Mercator projection (EPSG 3857). If this is the case, please refer back to the wgs84 lat/longs web mercator discussion, as it supplies everything you need to do.

If you have additional questions on how to apply this to your specific environment/needs, please let me know and I will assist you.

Thanks,

-Ed