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6

If I wanted some ready-to-go building footprints, I'd start calling county Assessor offices and city planning departments. I think they will be your best bet for ready-made building footprint polygons. However because these are expensive data, I believe it's rare to find them free for the taking. It's likely even rarer to find it associated with ...


5

There are a number of places where footprints can come in very handy Public Sector: Taxation: As @Mapperz said, taxation is one area. The percentage of property that is built on is sometimes used as a tax criterion. Planning: Knowing where structures already exist on property can help in the planning process due to applied setbacks and minimum ...


3

There are many options for you in ArcGIS, however I would stay open to open-source solutions too. You can purchase an extension for ArcGIS called Feature Analyst, which uses a feature extraction algorithm. Otherwise, try Iso Cluster Unsupervised Classification (Spatial Analyst) on 4-band DOQ's (Earth Explorer). Once you find the right recipe for ...


3

I don't know there is any way to automate such process by using ArcGIS. But I strongly recommend you to check out one software which name is eCognition developed by Trimble. eCognition is based one the idea of object oriented classification; it builds up a picture iteratively, recognizing groups of pixels as objects. It uses the color, shape, texture and ...


2

Well this is almost certainly against Google's Terms of Service, so I'm definitely not recommending it, but I found an interesting method of extracting Google Earth building models to OBJ files here: Google Earth to OBJ Using GLIntercept If you can wait, the Singapore Land Authority is reportedly in the process of developing a 3D togographic dataset. I ...


1

You can add the old repository where have plugins out in Official Repository. http://pyqgis.org/repo/contributed The image boundary plugin have option for calculate valid pixel, but, the image need be the full scene, how CBERS or Landsat, where this process calculate the first 4 corners. The image need have nodata with ZERO value for area without ...


1

I think it will be difficult to get a satisfactory result, especially just using Model Builder. I think you will have to investigate scripting this. One approach you could try is to use Hawth's tools to populate your parcels with a number of points at your density, setting the point-to-point separation and separation from the polygon edges appropriately. ...


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Use the ST_Envelope function: SELECT ST_Envelope(rast) FROM raster_table; This will return a rectangular bounding box for your raster(s). PostGIS describes what this function returns as: Returns the polygon representation of the extent of the raster.


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Albania http://tpginc.net/gis/albania/albania.php Bosnia http://www.cartographic.com/xq/asp/bosnia/and/herzegovina/gis/data/navmode.r/rid.47/tid.8/sid.0/cid.0/vid.0/oid.0/qx/hub/index.asp Macedonia http://www.gisdata.com/Default.aspx?sec=684


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Openstreetmap would be a good place to explore first. Then I would recommend going looking at each countries statistical/data office, and then each city that you are interested. There are a few other questions on this site about global data which may be of use.



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