[talk-ph] planned new imagery for Eastern Bulacan area for mapwarper and openstreetmap

[maning sambale]

Another option is to crowdsource the rectification using mapwarper:
http://warper.geothings.net/

But this becomes a chicken and egg problem, some OSM roads along
Bulacan area may not be a reliable ground control points.



I will slice the whole image into slices with small overlaps.

On Fri, Jan 8, 2010 at 11:44 AM, maning sambale
<emmanuel.sambale at gmail.com> wrote:
> tim,
>
> We have acquired new imagery for tracing roads in Openstreetmap.  It
> is a single SPOT image of approximately 3 GB.  Can mapwarper rectify
> such a large image?
>
> Any ideas on how we can rectify them?
>
>
> ---------- Forwarded message ----------
> From: maning sambale <emmanuel.sambale at gmail.com>
> Date: Thu, Jan 7, 2010 at 8:07 PM
> Subject: planned new imagery for Eastern Bulacan area
> To: osm-ph <talk-ph at openstreetmap.org>
>
>
> Hi,
>
> As promised, we have a possible new imagery to add in Eastern Bulacan Area.
> Approximate image resolution is 10 meters.  Not as good as what is in
> Pangasinan, but better than LANDSAT and this is more recent
> (20080312).
>
> The sample image is here:
> http://farm5.static.flickr.com/4052/4253859520_0ffd4613e5_o.png
>
> Some issues:
> 1.  The image is a a bit dark.  So I manipulated image (histogram
> stretch in remote sensing parlance) to look better.
> http://farm5.static.flickr.com/4013/4253860134_116b380aa8_o.png
>
> 2. The default georectification is shifted, (sat image with OSM road overlay)
> http://farm5.static.flickr.com/4033/4253859690_fe364081c5_o.png
>
> Ergo, we need to collect accurate GPS point (ground control point
> aging in RS parlance) to correct them.  Anyone willing to give me a
> hitch around Bulacan area to collect GPS points (I can't bike that
> far)?
>
> 3.  The eastern most portion is almost covered by clouds so we may
> have to crop the image to conserve space.
>
> 4.  The image is veeery big (3 GB)! I am having problems with RAM and
> disk space.  This may take a while for me to process.
>
> @ rally, the Towerville site is visible in the map.  You may use them
> as mapping reference.
>
> Any help is appreciated.
>
> --
> cheers,
> maning
> ------------------------------------------------------
> "Freedom is still the most radical idea of all" -N.Branden
> wiki: http://esambale.wikispaces.com/
> blog: http://epsg4253.wordpress.com/
> ------------------------------------------------------
>
>
>
> --
> cheers,
> maning
> ------------------------------------------------------
> "Freedom is still the most radical idea of all" -N.Branden
> wiki: http://esambale.wikispaces.com/
> blog: http://epsg4253.wordpress.com/
> ------------------------------------------------------
>
>
>
> --
> cheers,
> maning
> ------------------------------------------------------
> "Freedom is still the most radical idea of all" -N.Branden
> wiki: http://esambale.wikispaces.com/
> blog: http://epsg4253.wordpress.com/
> ------------------------------------------------------
>



-- 
cheers,
maning
------------------------------------------------------
"Freedom is still the most radical idea of all" -N.Branden
wiki: http://esambale.wikispaces.com/
blog: http://epsg4253.wordpress.com/
------------------------------------------------------