The Data Bank Technical Advisory Committee at the last meeting recommended that the Level-2 DEMs should be reproduced from 30-meter to 10-meter interval, and the DOQs be revised for the 1999 NAPP both in the state-plane and the UTM coordinate systems for the Lancaster County as a pilot project.

The NRC, in a work-share agreement with U.S. Geological Survey, recently completed production of 10-Meter Level-2 DEMs for the Lancaster County pilot project. These DEMs are developed from the Tagged Vector Contour data derived in the 1950s. The question is whether the revision of DOQs is better refined using 10-meter DEMs over 30-meter DEMs for a statewide coverage.

Concerning DOQs, the AT work has been completed, and the grayscale NAPP imagery received from the USGS for the project area. The NRC has also produced DOQs for the Lancaster County project, except for the six quarter-quadrangles area whose imagery is missing. Also, the DOQs are processed in both the UTM and State Plane coordinate systems.

The Committee at the last meeting recommended that a comparison be made by projecting the DOQs to state-plane from UTM, instead of newly creating in the state-plane in terms of cost, time and quality. It is recognized that there is a loss in resolution when projecting a DOQ from UTM to state-plane than if it is recreated directly from base data. However, it requires creating DOQ two times, one in the UTM system and the other in the state-plane system.

The NRC has since automated the process of creation of DOQs in the state plane from base data, there is no extra cost and time involved anymore. Therefore, DOQs will be processed and recreated in UTM and state plane directly from base data.

The USGS, however, wants to investigate three techniques of producing AT work required for the revision of DOQs.

1. Use existing field control for producing new AT.
2. Transfer original AT points to new NAPP without using field controls,
3. Use original DOQ as control source for the new NAPP.

The first technique yields the most accurate product. Currently, the Lancaster county project is done using the first AT methodology. The other two methods are under investigation.

Based on the pilot project, the Committee is requested to review and discuss above methodologies and arrive at some consensus for the revision of DOQs statewide.

The Committee at the last meeting recommended development of a hydrographic database for a test watershed at a scale of 1:24,000 that meet national standards. The hydrographic database has been designated a priority database by the GIS Steering Committee. The study includes developing a stream network, identify stream reaches and delineate watershed boundaries within the project area. The project is to be undertaken in cooperation with USGS and other partners in the program including DWR, DEQ, DOR, NGPC, and NRCS. The Committee also selected Logan Creek Watershed for this pilot project

During Mid-March, three employees from NRC and one from DWR participated in a training workshop conducted by the U. S. G. S. at their Mid-Continent Mapping Center in Rolla, Missouri. They along with partners from DEQ and G&P, are currently developing the NHD database for the Logan Creek watershed.

Also, the Data Base Advisory Committee met on April 6^th, and discussed the development of this 24k high-resolution National Hydrographic database. The development process essentially consists of three parts.

1. Pre-conflation stage - Development of stream network based on existing 24k DLGs and DOQs.
2. Conflation stage - Attribution of hydrographic features based on available 100k EPA NHD database conflated to 24k.
3. Post-Conflation stage - Identification and attribution of missing stream reaches in the above 24k high-resolution network.

Currently, processing of Logan Creek Watershed at the pre-conflation stage is almost completed, and the project is progressing on schedule.

The NRC in collaboration with U. S. Geological Survey and other Nebraska partner agencies, is developing this high resolution National Hydrographic database for the Logan Creek watershed. This pilot project will provide information on the production process, database standards and resources requirements for development of a statewide database. This NHD database is designed to provide a comprehensive coverage of stream networks and hydrographic information for the state.

The proposed changes in the Data Bank Fee schedule are highlighted.

A. Data Retrieval through Internet

No costs charged for databases made available on-line and downloaded through the Internet except for special data requests processed in the Data Bank.

B. Data Requests Processed in the Data Bank

Electronic Media Copies:

Processing of DOQs

C. Mailing Costs - Postage costs added to Data Processing costs.