[Imports] Massachusetts road data

Paul Norman penorman at mac.com
Sat Aug 6 09:50:00 BST 2011

Speaking as someone who has used large aerials, there are essentially three

1. Host them with a WMS server
2. Host them using TMS (tiled slippymap images)
3. Offer them for download as GeoTIFF or MrSID

The third is often the easiest but requires the users to be able to do one
of the first two options themselves, which can be moderately difficult.

The other two are different options for serving up from your server. WMS is
the more traditional option. My experience has been that TMS is faster,
requires less processing while serving and is easier to set up. It also
requires more processing before setting up and more disk space. I would have
converted my Surrey orthos to TMS if there were faster free options for
doing so.

Both 1 and 2 work with JOSM. I believe only TMS works with Potlach2, but I
don't know as I don't use Potlach. 

I would suggest offering them for download even if you have them available
as a WMS or TMS. 

Just for reference, the orthos I got from the city were about 9 GB as a
MrSID and about 170 GB as a GeoTIFF. I used an external HD to get them from
the city.

> -----Original Message-----
> From: Metcalf, Calvin (DOT) [mailto:calvin.metcalf at state.ma.us]
> Sent: Friday, August 05, 2011 12:30 PM
> To: Richard Weait; imports at openstreetmap.org; OAM List
> Subject: Re: [Imports] Massachusetts road data
> There is a second file for routing which I guess massgis didn't include
> we can get that to you.
> For the orthos/obliques we would be able to host, just need to figure
> out the best way how so talking to the OAM people should right.
> -------------------
> Calvin Metcalf
> Massachusetts Department of Transportation Office of Transportation
> Planning
> 10 Park Plaza Suite 4150
> Boston, MA 02116
> Office 617-973-7027
> calvin.metcalf at state.ma.us
> >-----Original Message-----
> >From: Richard Weait [mailto:richard at weait.com]
> >Sent: Friday, August 05, 2011 3:25 PM
> >To: imports at openstreetmap.org; OAM List
> >Subject: Re: [Imports] Massachusetts road data
> >
> >On Fri, Aug 5, 2011 at 11:30 AM, Metcalf, Calvin (DOT)
> ><calvin.metcalf at state.ma.us> wrote:
> >[ ... ]
> >> The oblique and ortho data is in .psi and .pmi formats
> >respectively, which is a type of .jfif file that the program pictometry
> >uses, for those I was more looking for some information for how we
> >should go about making those available.
> >
> >What Serge said is worth repeating.  Thank you for your interest in
> >OpenStreetMap and in making the data of the people of Massachusetts
> >widely available.  This is awesome.
> >
> >Also, the oblique and ortho photos sound delightful.  I hope that our
> >friends at OpenAerialMap (cc'd) will be able to participate by making
> >the photos available for more consumers using a wide range of tools.
> >
> >For the folks on the OAM list the original thread is found here,
> >http://lists.openstreetmap.org/pipermail/imports/2011-August/00
> 1013.html
> >
> >Best regards,
> >Richard
> >
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