Digital Government Project Meeting Summary

October 31, 2003
3:30 pm in 230 Bolz Hall
Co-PIs and RAs
Future Meetings

Attendees:

Summary:

In this meeting, progress on the project was discussed in terms of four aspects of the project:

  1. Comparison between water-surface model data and altimetry data,
  2. Web system design of the ODNR system,
  3. 3D visualization for spatial data integration, and the
  4. Erosion awareness system.

1. Comparison between Water Surface Model Data and Altimetry Data

Vasillia first presented her the results from her comparison between the model data and the altimetry data along the longest of three altimetry tracks:

a. The RMS of the relative differences between these two kinds of data ranges from 4cm to 9.0cm.
b. The RMS values at the two or three beginning points of the track, which are closer to the southern shore of Lake Erie, are greater than those of the other points along the track. As the points were getting farther north, the RMS of differences is getting smaller.
c. The instantaneous point-based comparison along the longest track shows the pretty similar variation pattern between the two kinds of data.

Professor Bedford and professor Shum both pointed out that the depth of bathymetric data under the point track should be examined, which would be used to count for the result b. A profile of the bathymetric data is needed. The seasonal factor, river entrance, and the topographic characteristic of the lake basin are the possible affecting factors.

Dr. Shum suggested using the water gage-altimetry data as the reference surface for water surface model. It will reduce the affect of the geoid transformation error.

Dr. Li suggested processing the model data with the same method as the altimetry data and the final interpolated point positions of model data being the same as the ones of altimetry data.

2.Web System Design of ODNR System

The web site of the ODNR system designed by Xian Xu was demonstrated to Dr Li. The following ideas for improvement were given:

a. The system should use real data for testing the system, such as design maps of construction.
b. The system should be able to display the AutoCAD file of the design map, which is uploaded from the user or applicant.
c. In the 2D map window, the applicant’s parcel should be highlighted (for example, using the color yellow). The legend text should be formal (shoreline -> shoreline, year; parcelmap -> parcel map, which can be done by changing the configuration of map design of the ArcIMS axl file).
d. In the 2D map window, all information relating to the applicant’s parcel should be displayed along with that of all its neighbors’, also. Different query functions should be added to the 2Dmaps.
e. More shorelines should be added to the 2D map and the user/officer should be able to toggle the shorelines on or off.
f. Xutong’s 3D web-based visualization will be added to the system. More shorelines are to be added in the display along with different water surfaces.

3. 3D Visualization for Spatial Data Integration

The 3D visualization developed by Xutong using Java 3D was shown.

a. In order to improve the visual quality of the differences among different data, two display components will be added to the map. One is the top view of the 3D visualization and the other is the side view/profile of the 3D design.
b. More water surfaces will be added to the system with solid-shaded display. Toggle control will be added to the system interface so that users can switch to different surfaces.
c. Gauge station points will be added to the system.

4. Erosion Awareness System.

Alok reported on his progress in learning Tarig’s erosion-awareness system and also discussed the shoreline prediction method with Dr. Li.


Action List:


For more information, E-mail : li.282@osu.edu