3D Canada -- InforShell Digital Product

Canada country wide flood risk study via elevation database

Detailed analysis of topography and Digital Elevation Model (DEM) is essential to flood risk study. An elevation difference of one or two meters will determine whether an area is affected by a flood. In such context shaded relief and false color visualizations of DEM's do not provide sufficient elevation resolution for practical flood risk analysis.

A decision support system that provide 3D visualization of topography and 1m resolution DEM data access is effective for precise flood risk studies. InforShell's backend database management system GADB-Shell enables professional data analysts to integrate true color RS images with 1m vertical resolution DEM and import the two layer imagery into database. InforShell also created 3D Browser that retrieves RS imagery and DEM data from database and provides visualization and analysis features for users. Using the 3D Browser, users can examine terrain features, drainage patterns, visualize topography at 1m resolution via elevation filters to identify areas below/above target elevation thresholds. Additionally, historical data, rivers, and other geographic features can be attached/labeled to the true color imagery to facilitate analysis.

3D Canada - True Color Elevations is a CD-ROM product assembled by InforShell that is a convenient utility for flood risk studies. Key features of the 3D Browser is also provided below. Please contact us with questions or for additional details/demos.

Figure: Ottawa area topography 3D study

3D Canada - True Color Elevations (One CD-ROM)
-- canada 3D representation using DEM (Digital Elevation Model) database with true color image indexing & visualization
-- easy access to elevation data at 1km ground and 1m vertical resolution
-- use for country wide flood risk analysis

3D Canada combines satellite imagery and elevation data to bring you a vivid view of the Canada's environment. You will roam a continuous true color image of Canada at 1km ground resolution (NASA's Blue Marble, 30 arc-seconds), and view cursor point longitude, latitude and altitude data (GLOBE Digital Elevation Model, 1m vertical resolution). Interactive 3D elevation plots with true color surface texture visually illustrate drainage patterns and elevation trends. The image filter feature will further highlight areas of interest according to your target elevation range.

3D Canada - True Color Elevations is an efficient assembly of geographic data for your reference, teaching or studies.

No installation required. System Requirements: MS Windows 98/NT/2000/Me/XP, CD-ROM drive.

Figure: Canada true color 3D elevation visualization
(or false color)

order, interactive features, demo, home

Image filtering and highlighting
-- interactive data analysis

The "Image Pixel Study" feature allows users to observe longitude/latitude and elevation values of pixel under the cursor. The "Image Filter" feature further enables users to specify filter conditions to apply to elevation data, including Below, Above, Equal, Not Equal, and Between operators. Filtered image display offers grayscale and highlight options. As well, highlight color can be opaque or transparent.

Examples of "Image Filter" use include:
(1) Known elevations where a particular species of plants/animals frequenly inhabit can be easily identified.
(2) Effects of potential flooding (e.g. a dam bursting), where affected areas are those below a certain elevation threshold, can be visually identified.

Figure: In transparent purple, locations with elevation between
700 and 1000 meters are highlighted on the satellite image.

Mouse cursor controlled 3D Engine

3D Browser is a client end application developed by InforShell that superimposes large RS imagery and environment data (retrieved from database) to present a seamless geographic information platform. Via this software end users can perform interactive 3D environment analysis and visualization. A variety of distributed data can be visualized by 3D Browser, for example, DEM, Vegetation Indices, Leaf Area Index.

An existing 3D Browser application is InforShell's Canada 3D 1KM True Color RS Image & DEM Database. Imagery and elevation data points are mapped together as illustrated below:

3D Topography Visualization

The "Image Elevation 3D Study" feature opens an interactive 3D visualization display window, in which a 60X60 to 240X240 pixel square plot can be freely rotated or enlarged via control of the mouse. Returning to the original window, the mouse can be used to navigate, and dynamically refresh the 3D plot in real time with a new region of data.

The "Select 3D Options" feature further enables users to precisely control 3D plot style to optimize it's illustrative effect. For example:

(1) Changing color of bars, background, grid-display or luminance;
(2) Changing surface color smoothing coefficient, or elevation data smoothing coefficient (each provides 6 levels).

Additionally, original elevation data in numerical form can be exported to facilitate further data analysis.

Figure: Comparing before and after elevation data
and surface color smoothing.

Location oriented interactive 3D analysis

Figure: Flatland area (New Orleans .USA) 3D bar graph mode
to enable exact comparison of elevation data per pixel

Figure: Hilly area elevation data visualized via 3D analysis feature

Location Specific Notes
-- adding notes to geographic background at desired positions.

Users can easily embed notes, tracks or images into the satellite image, which can be saved into files for easy storage.

Example uses for embedding notes and tracks:
(1) Marking wildlife distribution, or natural diaster sites's data and history.
(2) Recording location oriented data gathered from surveys or field work, including natural resources distribution, archeological excavations.
(3) Notes from travel, or points to aide teaching.

Notes or images acquired on site can be embedded within location markers (symbols) placed over the geographic background. Users can organized/categorize these notes by saving them into files on his/her computer. Thus different sets of notes can be prepared for different scenarios. This note/track feature provides a simple means to made additions to the geographic platform.

Figure: User track added

Third party plug-in DLLs

Easy integration of third party data processing algorithms (using plug-in DLLs) to facilitate dynamic 3D visualization of private data analysis results.

(1) The geographic information platform can be created from user's existing imagery/data resources, or purchased according to customer requirements. A geographic information platform helps users integrate natural resources data, environmental conditions, natural disasters records, population distribution, as well as distributed network systems etc. Such information systems greatly facilitate sustainable developement planning.
(2) Increase commercial value of user's satellite imagery and elevation data.

Figure: Third party plug-in DLLs