We have created a square image with 32,768 pixels in each direction; a resolution of one giga pixel. It is composed of over 2100 images, submitted by people fond of hiking and we thank everyone washers game for a good volunteer.
Meta Pixel require that all images in the collection have the same aspect, and since we got submitted both portraits and landscapes as we landed somewhere in between with square images. To be sure to get everyone and everything in the pictures, we decided that it was better and that someone was a little thicker or thinner than that someone would risk being beheaded by cropping images. Sorry it Viewing and navigating
Such a large image will not show in normal imaging applications. Uncompressed would picture taken 3GB. Therefore, we were forced to split up the image into smaller parts. There are several giga-pixel images online, but common for most is that they use Flash for the presentation washers game of the images, and it was not good enough washers game for us. We wanted a solution that would work on mobile devices, such as phones washers game and tablets, with and without Flash support, the ability to view in fullscreen and support to bookmark and share an image section with friends after they have reached their own image. Map Engine, the solution
We were inspired by the work of Chris Petersen to try to use map engine from Google, JavaScript client to Google Maps to pan and zoom the image. We used tools developed to cut the image into smaller square framing washers game of 256 256 pixels; same size as Google itself uses the framing of their maps. To make it possible to see the whole picture on a normal PC monitor without the need to pan the image we made copies of various sizes on the image, and to adjust the zoom levels to map engine halved washers game we size each time zooming beyond. The world is not flat
Google Maps used to navigate in a round the world, but since our picture is flat, we needed to make some changes in map engine. We made new projection logic that converts viewpoints washers game browser into pixels in the image of the current zoom level. In the round the world it is possible to spin the soil around all roads, but it is poorly suited for pictures, so we made it so that you can not navigate outside and away from the image. Statistics and performance
In front of the web servers we have set up Varnish to cache image cuts, which worked very well. At most delivered servers out 127 framing washers game in second with 17.2 Mbits / second. These data are measured washers game with a resolution of one minute. Source Code
I looked a little on AndreaMosaic but I needed something that could script. We ran several tests both finding the best design and fine-tune the parameters for the best possible result without the same image to be repeated too often.
By sheer curiosity I tested AndreaMosaic again and found out that the maximum size was 210 Mpix and the used memory, about 590 MB RAM, 2.6 GB virtual. By comparison used meta pixel under 3 MB RAM at the same size.
UCL has created a savings program in java that takes a large image as input, cut this up and provides as output a full directory structure google maps for viewing. Hope you did not use for a long time to program this yourself. link two casa.ucl.ac.uk
The biggest challenge was our memory usage. We tried us forward with even bigger images, but had trouble splitting the tiles, when we did not find any tool that could scale and cut as large images.
Spigot little on one thing: why Google Maps API? And not OpenLayers (www.openlayers.org), which is open source? I'm pretty sure the same is possible there and releasing Google washers game bindings fully
Henrik Lied (NRK) (answer to Andre) February 15, 2011 at 11:18
Can you give me some info on what kind of a browser your use, as well as what kind of operating system you are on? This help feilsøkjinga of the problem, washers game då I'm not able to reproduce the events in either Firefox, Safari or Chrome (OS X).
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