Thanks for the outline.
Image tiles should be 256x256 pixels in 8- or 24-bit compressed PNG format
Being a tile person my main concern is that tile format is being too tightly
restricted leaving out the vast majority of image tile formats currently in
use:
Google Earth / WorldWind: geographic 512px jpg
Google Maps / YM / and VE: mercator 256px jpg
In actual fact I think most existing OAM tiles would not qualify under the
proposed format.
While the variety of tile formats might seem superflous they are there for
precise reasons.
One of them is that internet access outside the US and Europe is both
extremely slow and extremely expensive: those of you who were at FOSS4g 2008
in Cape Town last year have have experienced this first hand. Image quality
is very poor as png 8bit and 24bit pngs are huge and should only be used for
no-data areas.
In past posts I had noted that one of OAM main aims was to make image data
accessible for disaster-relief: in Africa we have lot of that.
Accessibility is the key: my personal opinion is that any tile which can be
viewed in OpenLayer should be considered as suitable.
As madmappers.com (an African non profit initiative aimed at GIS data
accessibility) we are prepare to TILE, HOST and SERVE any African data which
can be distributed publicly.
In actual fact madmappers could immediately start dishing out, under the OAM
umbrella, a few hundreds of thousands kmsq of already tiled imagery for
various African countries. But then that should probably be a separate post.
ciao
Maurizio
----- Original Message -----
From: "Schuyler Erle" <[email protected]>
To: "talk" <[email protected]>
Sent: Tuesday, November 10, 2009 9:30 PM
Subject: [OAM-talk] a dramatically simplified technical proposal
Hello, friends. In response to feedback both on and off list, I have
rewritten the previous draft technical proposal into a much, much
simpler implementation plan that reduces the initial complexity of the
storage network, and describes the primary use cases:
http://wiki.openaerialmap.org/Technical_Proposal
I hope that this new proposal highlights the importance of the layer
catalog.
I have moved all of the lovely-but-possibly impractical P2P stuff here:
http://wiki.openaerialmap.org/P2P_Network_Proposal
Please, please, please have a look at the new technical proposal draft
and send comments to the list (or just edit the wiki page).
I will be attending Random Hacks of Kindness in Mountain View on Friday,
and I would really like to help coordinate interested developers in
hashing out the first cut of the catalog server and the cache node
configuration. Please feel free to contact me if you'll be there and
interested in getting involved.
Thanks!
SDE
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