[GIS] Convert DWG/shp format for Openlayers

openlayers-2

I need to convert DWG/shp files to some vector data file that is supported in
Openlayers (e.g KML,GML). I tried following this guide but it doesn't work.

Please advise me some converter (not necessarily free) that I can use.

Best Answer

For shapefile - simply open shp in QGIS and on the Layer menu -> "Save as", it can save to KML, GML, GeoJSON and many more.

For DWG it is a bit harder because it is not open format, you will need some comercial tool to convert it to DXF 2000/2000i/2002 version. Then DXF file you can also open in QGIS (it uses GDAL/OGR behind the scene).

For converting DWG to DXF 2000/2000i/2002 you can use e.g. Microstation, Teigha libraries, AutoCAD.. If you need the converting automatically done on server side at runtime then it's more complicated, two possible solutions:

http://geokods.com/#!/blog/view/v8_dgn_dwg_gdal_ogr_dxf_patches

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[GIS] Using local mbtiles in openlayers

For the benefit of people who have the same question:

OpenLayers can't use MBTiles directly. You'll have to extract the tiles as @maning has commented. Luckily there's a tool called MBUtil that exactly does that. With it, you can extract all the images from the MBTiles and serve them directly from image folders.

For example, if you have an an MBTiles file named geography-class, you can extract the images by using the following command:

mb-util geography-class.mbtiles tiles/geography-class

The extracted tiles will be stored in z and x subdirectories such that they have a filesystem path like 0/0/0.png which should play nicely with most web mapping clients.

[GIS] How to project a geoJSON file in OpenLayers

@Stefan Van Der Hoorn's code is true for converting json file projection but in projection you firstly have to define your proj.

var epsg4326 = new OpenLayers.Projection("EPSG:4326");

if this code does not work, you can transform it before adding your vector.

vectors.transform(map.getProjectionObject(), epsg4326 );
map.addLayers([vectors]);

or in postgis you can transform it:

UPDATE myTable SET  the_geom = ST_Transform(the_geom,4326);    
SELECT UpdateGeometrySRID('myTable', 'the_geom', 4326);

i hope it helps you...

Best Answer

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[GIS] Using local mbtiles in openlayers

[GIS] How to project a geoJSON file in OpenLayers

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