WebGL Lightning Talk FOSS4G 2011
15
Accelerating remote sensing visualization with WebGL Trevor Clarke Opticks Developer Ball Aerospace & Technologies Corp. [email protected] http://opticks.org
-
Upload
trevor-clarke -
Category
Technology
-
view
1.139 -
download
0
description
This lightning talk will demonstrate and discuss initial work which accelerates certain ELT visualizations using WebGL. This allows for more efficient client-server remote sensing analysis especially over low bandwidth links. WPS and WCS are used to generate intermediate processing results such as spectral angle matrices. HTML5 technologies such as WebGL and Canvas are used to dynamically visualize this data on the client side. Speaker Bio: Trevor Clarke is a software engineer at Ball Aerospace & Technologies. Trevor has a masters degree in computer science from RIT and is a core contributor to Opticks.
Transcript of WebGL Lightning Talk FOSS4G 2011
Accelerating remote sensing visualization with
WebGL
Trevor Clarke
Opticks Developer
Ball Aerospace & Technologies Corp.
http://opticks.org
Non-literal remote sensing
• More than just pictures• Spectral
• Calculate statistics and visualize relationships
• LIDAR• Dynamic 3D visualizations
To the cloud
• Wouldn’t it be cool if we could do this in a web browser?
To the cloud
• Maybe we can• WMS – Context maps• WCS – RAW data• WPS – Process execution
To the cloud
• Doesn’t help with LIDAR• Spectral display often need lots of
“tweaking” to find proper thresholds, etc.
To the cloud
WCS WPS WMS
Adjustthreshold
Desktop solution
• A typical solution for desktop apps is to calculate the results data once and just change the display• This is quite fast when all display
operations happen in RAM and/or on the video card
A solution for the browser
• Calculate the results data once with WPS and transfer with WCS
• Perform visualization and compositing with Canvas/WebGL
A solution for the browser
WCS WPS WCS
WebGLTextureadjustment
Histogram
A solution for the browser
Includes material © 2010 DigitalGlobe, Inc. ALL RIGHTS RESERVED
Current status
• Proof of concept complete• Partially completed WebGL/Canvas
layer for OpenLayers• Some basic shaders completed
(primarily for hyperspectral)• Threshold• Dynamic color maps
Current status
• Multiple server side solutions being tested• GeoServer for WMS• MapServer for WCS and WPS results• 52north, PyWPS, and Zoo being
evaluated for WPS
Future
• Port to mobile platforms• Little to no WebGL support currently• Shaders and data flow are the same• Java (Android) or Objective-C (iOS)
instead of JavaScript• gvSIG Mini Maps might be a good starting
point
Future
• Same technique useful for LIDAR (and other 3D display)
• Multiple shaders for a variety of display modes available from Opticks (my other project)
Q&A
Trevor Clarke
Opticks Developer
Ball Aerospace & Technologies Corp.
http://opticks.org
Presentation available at http://slideshare.net
