1812 BD DEM transparency painted onto the DTM

Metadata:

• Identification_Information
• Spatial_Data_Organization_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: NRSC

Publication_Date: 20021022

Title: 1812 BD DEM transparency painted onto the DTM

Edition: First Edition

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: To be published in Spatial Daily Newsletter

Publisher: To be published in Spatial Daily Newsletter

Description:

Abstract:

The primary data input were points digitized from 1979, 1:50000 topographic sheets. According to Becker (2001) primary data entails data captured and maintained to the lowest common denominator, free of redundancy. The digitization of points was done in ArcView GIS 3.2, at 50-meter interval. Digitizing, one of the first step of geo-spatial techniques in creating a geo-spatial dataset, is the process of converting the features on a paper map into a digital format (ESRIÔ, 1996). The following 14 sheets were digitized: 2717AD; BC2717; BD2717; CA2717; CB2717; CC2717; DA2717; DA2716; DB2716; DB2717; DC2716; DC2717; DD2716 and DD2717. The points were captured in digitizing units because the program could not transform the coordinates to real world coordinates (Bernhardsen, 1992). A field in the attribute table that stored elevation values was created.

Purpose:

To come up with a 3D view model of the area. To improve image classification for future land cover classification of the study area, texture mapping, and generation of vegetation growth models.

Supplemental_Information:

Mapsheets were edge matched so as to merged and append them to produce a combined coverage. The process ensures that the sheets are matched precisely at the edges (Fig. 2.5.1).

Experience has shown that projection definition alone cannot produce good result in edge matching. Sheets to be edge matched should consulted during the process. The user needs to check the end or beginning of a feature from one sheet to another and adjust the features. At this stage it is better for the user to switch to ArcInfo Workstation rather than using Desktop ArcGIS. Using the former will avail the user to the environments similar to the older version of ArcInfo (7x).

In this study all the edge matching and the finishing touches were done in ArcInfo Workstation, and the merged output coverage produced

Vector: Scale of original/hardcopy map: 1:250 000 Feature Type: polygon Attributes

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20020916

Ending_Date: 20030124

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 12.45

East_Bounding_Coordinate: 13

North_Bounding_Coordinate: 18.15

South_Bounding_Coordinate: -18.3

Keywords:

Theme:

Theme_Keyword_Thesaurus: Digital elevation

Theme_Keyword: digital elevation model

Theme_Keyword: modelo digital de elevación

Place:

Place_Keyword_Thesaurus: Southern Namibia

Place_Keyword: Southern Namibia

Access_Constraints: None

Use_Constraints: None

Browse_Graphic:

Browse_Graphic_File_Name: 1812 BD DTMDEM

Browse_Graphic_File_Description: 1812 BD DTMDEM bitmap inserted into word documents

Browse_Graphic_File_Type: PBM - Portable Bit Map format

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: F.M.Muyoba

Contact_Organization: National Remote Sensing Centre

Contact_Address:

Address_Type: Mailing and Physical Address

Address:

6, Parsons Street Lucas building Southern Industrial Area

City: Windhoek

State_or_Province: Khomas Region

Postal_Code: P/Bag 13346

Country: Namibia

Contact_Voice_Telephone: +264-61-221478

Contact_Facsimile_Telephone: +264-61-222830

Contact_Electronic_Mail_Address: nrsc@met.gov.na

Resource_Description: Bitmaps were inserted into Microsoft Word Document

Distribution_Liability: Data not to be sold

Metadata_Reference_Information:

Metadata_Date: 20020916

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: F.M.Muyoba

Contact_Organization: National Remote Sensing Centre

Contact_Address:

Address_Type: Mailing and Physical Address

Address:

6, Parsons Street Lucas building Southern Industrial Area

City: Windhoek

State_or_Province: Khomas Region

Postal_Code: P/Bag 13346

Country: Namibia

Contact_Voice_Telephone: +264-61-221478

Contact_Facsimile_Telephone: +264-61-222830

Contact_Electronic_Mail_Address: nrsc@met.gov.na

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998