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| Subject: | [gislist] Conflate (Conflation: align perfectly) datasets
Programmatically/Automatically!!! |
| Date: |
04/02/2004 07:35:01 AM |
| From: |
Mach Chnife |
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Hi list,
Here's what I need to do:
-Reproject mapinfo files to new projection
-I got a main, high precision, dataset covering the whole area in the new projection. Each of those newly reprojected files must be perfectly aligned with the main dataset.
-All mapinfo formatting (color, line/border style) must stay the same.
-Some mapinfo tables will contain multiple types of geometries (polygons, lines, points, etc.) and it must be kept like that.
A thousand files, in hundreds of directories, must be processed. So the only way to go is to find an automated way.
Until now, I have explored using FME Objects and VB to do the job. I think it would do it but there's a glitch. I don't know a way, with FME, to perfectly align a coverage with another. A technical term for what I'm trying to do in "Conflation". I need to conflate all coverages to the main dataset. I thought AnchoredSnapper was the solution, but some vertices were not correctly aligned to the main dataset. I believe it's because AnchoredSnapper doesn't recognize intersections (an intersection in the subject coverage is snapped to a vertex close to an intersection in the reference coverage, instead of snapping to the vertex itself) and because it cannot add vertex in the middle of a line (some lines, very close from each other, are not snapped).
The theory of the kind of conflation I want to achieve is explained here: http://www.vividsolutions.com/jcs/caseStudies/mapsheets.htm
An open source software called JUMP using the JCS Conflation Suite plug-in, seems to be able to do the job. JCS home: http://www.vividsolutions.com/jcs/
The problem is I'd have to learn java to do it programmatically with that software.
Has anyone ever encountered a similar problem ? Is there an inexpensive and/or proven way to achieve this? Does someone has suggestions of other software to do this (Cheaper the better)?
Thank you very much!!!
mACH nIFE
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