Shahrukh,
I use MicroStation daily and have a licensed product so this would only work if
you have it installed.
Depending on your Bentley MicroStation version I’ve had some success writing C#
addin for the software to interpret Bentley elements and output geojson.
In the latest version (v10.17.02.61) you could do some trickery using the new
“Item Types”, I haven’t made one for geojson direct however I’ve had success
exporting an excel spreadsheet then using GDAL to convert this to geojson.
I’ve tested this with simple linestring and simple shape elements with upto 100
vertices (there’s currently no way of looping every vertex).
1. Create an Item Type for LineStrings call it WKT_LINE and create another
one for Shape WKT_SHAPE or something that makes sense to you.
2. Add a property call it WKT or whatever you would like the geometry column
to be called.
3. Set the following:
* Property Definition
i. Type:
Text
ii. Is Array:
False
iii. Is
ReadOnly: True
iv. Visibility:
Show
* Calculated Property
i.
Expression SEE BELOW
ii. Use last
valid value: False
iii. Failure
Value: ERROR GENERATING LINESTRING
1. Attach this item to required elements.
* WKT_LINE can be appended to simple linestring elements
* WKT_SHAPE can be appended to simple shape elements
2. Use MicroStation Export Item Types to export a spreadsheet
3. Use GDAL to convert spreadsheet to geojson or anything you want
Expression for LineString use first line below then repeat second line as many
times as you like, increment the number each time, 1 becomes 2, 2 becomes 3 etc
etc…. (Eventually would impact performance I guess), end with the last line.
"LINESTRING (" & IIF(this.GetElement().Count > 0,
this.GetElement().Segments[0].Start.X & " " &
this.GetElement().Segments[0].Start.Y,"")
& IIF(this.GetElement().Count > 1, ", " & this.GetElement().Segments[1].Start.X
& " " & this.GetElement().Segments[1].Start.Y,"")
& ", " & this.GetElement().Segments[this.GetElement().Count-1].End.X & " " &
this.GetElement().Segments[this.GetElement().Count-1].End.Y &")"
Expression for Shape / Polygon use first line below then repeat second line as
many times as you like, increment the number each time, 1 becomes 2, 2 becomes
3 etc etc…. (Eventually would impact performance I guess), end with the last
line.
"POLYGON ((" & IIF(this.GetElement().Count > 0,
this.GetElement().Segments[0].Start.X & " " &
this.GetElement().Segments[0].Start.Y,"")
& IIF(this.GetElement().Count> 1, ", " & this.GetElement().Segments[1].Start.X
& " " & this.GetElement().Segments[1].Start.Y,"")
& ", " & IIF(this.GetElement().Count>0,this.GetElement().Segments[0].Start.X &
" " & this.GetElement().Segments[0].Start.Y,"") & "))"
Cheers
Adam
From: gdal-dev <gdal-dev-boun...@lists.osgeo.org> On Behalf Of Shahrukh Mirza
Nawandish
Sent: Tuesday, September 5, 2023 3:11 PM
To: gdal-dev@lists.osgeo.org
Subject: [gdal-dev] : Inquiry about Converting MicroStation V8 DGN to GeoJSON
or Alternative Formats
Dear GDAL Support Team,
Is there a cost-effective or open-source solution for converting MicroStation
V8 DGN files to GeoJSON or other formats, as the Open Teigha SDK comes with a
cost.
Any suggestions or guidance would be appreciated.
--
Saygılarımla / Kind Regards
Shahrukh Mirza NAWANDISH
Havacılık Bilgi Sistemleri / Aeronautical Information Systems
Yazılım Geliştirme Uzm. Yrd. / Software Development Assist. Specialist
Bilgisayar Programcısı / Computer Programmer MCA
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