29.10.14

Virtual 3d globe for your website

Custom online globe can become an attractive feature for visitors of your website. No plugin is needed - just the modern web browser or a mobile device. In the following video tutorial we will show you, how to create your own globe from a texture, using MapTiler, and an open-source project developed by Klokan Technologies, WebGL Earth 2 API

To create your custom globe, you will need a texture of the globe with a size ratio 2:1, in a spherical or equirectangular mode. In the tutorial, we used Cassini globe downloaded from the David Rumsey's website. If you already have the texture, just use MapTiler and then suitable hosting - either on Amazon S3 or on any webserver using Tileserver.php.

And how to go from a real globe to a texture? Typically by photographing in a light box to prevent reflection and processing with a software such as Autopano (http://www.autopano.net/wiki-en/action/view/Understanding_Projecting_Modes) or AgiSoft Photoscan. More information about processing of the globes can be also found in this article.


Video available at: https://www.youtube.com/watch?v=pf8itiTwo6w


20.10.14

IIIF for images in cultural heritage


Online scans of culture heritage documents, such as old maps, books, photographs, etc. are being published by the galleries, libraries, archives and museums.  Until now there was no official standardisation activity in this area. This is now changing with the International Image Interoperability Framework IIIF (http://iiif.io/), which enables easy access to large raster images across institutions.

We are happy to announce a new Open Source IIIF viewer, with several useful features: 

- Rotation on client side  - pinch with fingers, Alt-Shift drag with the mouse
- Drawing tools - polygons, lines, markers - used to annotate parts of the pictures
- Color adjustments - saturation, lightness, etc



The viewer is pure Java Script, mobile optimised with almost native feeling for zoom and powered by OpenLayers V3 open-source project, where we are co-developers (see blog post).

Feel free to try at: http://klokantech.github.io/iiifviewer/

Source codes are available on GitHub: https://github.com/klokantech/iiifviewer/

This viewer is another important part of the mosaic of open source tools for publishing of large images and maps. Together with high-performance open-source JPEG2000 image server can be used to serve thousands of users in a very fast and efficient way.

The mentioned server providing IIIF endpoint for the JPEG2000 images was developed and released by Klokan Technologies in cooperation with the National Library of Austria and their Google Books scanning project, the Austrian Books in 2013. The documentation is available at: https://github.com/klokantech/iiifserver/

Server software runs under Linux, Mac OS X as well as Windows. There is even an easy to use installer.  It is powered by IIPImage server and our code has been recently refactored and merged back to the main IIPImage repository.

Support and maintenance for installation of this open-source software can be provided by Klokan as well as the access to JPEG2000 Kakadu license.

16.10.14

Amazon S3 as a WMTS cloud hosting for maps

The current version of MapTiler (0.5.5) supports direct upload of map tiles to Amazon S3 or Google Cloud Storage. Such hosting is a robust and affordable way to publish your maps online.

Maps rendered with MapTiler or available as MBTiles file are after upload available in various viewers, such as Leaflet, OpenLayers, WebGL Earth, Google Maps API, MapBox.js, etc.


Thanks to the OGC WMTS standard the maps can be also directly opened in QGIS or ArcGIS for Desktop. Compared to the standard S3 utilities, uploading of map tiles is a way faster, especially for larger maps.


The workflow is as simple as few clicks. Watch our video tutorial: