| WSSPOR TOPOGRAPHICAL INFO. FOR OHANGWENA REGION |
| Data ID |
| File name: | various directories and files |
| File path: | d:\north_central\Western Ohangwena WSSPOR |
| File type: | Arcview shapefile |
| Category: |
| Description: | Spatial data for Ohangwena: roads, buildings, hut points, wells, water holes, Oshanas and pans, fences, place |
| | names, height points. |
| Status: | Completed |
| Geographical area: | Ohangwena region |
| Keywords: | roads |
| | buildings |
| | wells |
| | water holes |
| | pipelines |
| | Oshanas |
| | pans |
| | fences |
| | height points |
| | WSSPOR |
| | Finnconsult |
| Date of last update: | 1994/12/01 |
| ID notes: | 1. The original digital data was supplied by the FINNCONSULT Water and Sanitation project (WSSPOR) to the |
| | Environmental Profiles Project in Microstation files. One file covered one 5’ by 5’ block. Microstation was used to |
| | save these files as AutoCad .dwg files. Line objects (with their attributes) could be read directly into ArcView and |
| | then saved as shape files. Point objects, however, were represented by text objects in the Microstation, and these |
| | had to be converted into Autocad .dwg files. ArcCad was then used to extract the point objects from the .dwg |
| | files and build them into spatial databases. ArcView was finally used to read the ArcCad databases and save the |
| | data in shape files. |
| | |
| | 2. Features were selected from the drawings by looking at what attributes (layer and colour) were used to |
| | symbolise the different features in the drawings. For example, huts were drawn as the letter "o" and were on |
| | layer 25 and were coded with colour 5. It is clear that some of these codes and attributes were occasionally |
| | applied inconsistently, so some of the data might be incorrect. The Microstation file for block 171db5 also had data |
| | missing from the southern portion of the block. |
| | |
| | 3.4. The following files were created: |
| | |
| | Roads.shp: line features representing different kinds of roads, tracks and footpaths. Two attributes (layer and |
| | colour) from Microstation are used to distinguish between different kinds of roads. However, these attributes are |
| | not used consistently or clearly. Elevations in metres above sea level are present as attributes for each line object. |
| | |
| | |
| | Buildings.shp : point objects represented by the letter “n” in the Microstation files. There are no other attributes. |
| | |
| | Hut_points.shp: point objects represented by the letter “o” in the Microstation files. There are no other attributes. |
| | |
| | Wells.shp: point objects represented by the symbol “$” in the Microstation files. There are no other attributes. |
| | |
| | Water_holes.shp: point objects represented by the letter “w” in the Microstation files. There are no other attributes. |
| | It would appear that these are often natural springs or artificial borrow-pits. Most of the points, and perhaps all, are |
| | surrounded by a line object (which should be a polygon) which was extracted and saved as |
| | water_hole_borders.shp). |
| | |
| | Water_holes_borders.shp: line objects (which should be polygons) that surround the point objects saved as |
| | water_holes.shp. However, many of the line objects do not surround these points. |
| | |
| | Pipelines.shp: Linear objects thought to represent the positions of pipelines. However, the lines are broken at |
| | regular intervals to accommodate letter symbols that were used in the Microstation drawings to symbolise the |
| | pipelines. In addition, there are many short, irregular lines in this set of data which probably do not represent |
| | pipelines. These lines were probably given the same attributes (layer, colour) when the Microstation data was |
| | digitised. Elevations in metres above sea level are present as attributes for each line object. |
| | |
| | Oshana.shp Linear objects representing the outer limits of oshanas and pans. Elevations in metres above sea |
| | level are present as attributes for each line object. |
| | |
| | |
| | Fences.shp: Linear objects representing the positions of fences around fields, etc. Elevations in metres above sea |
| | level are present as attributes for each line object. |
| | |
| | Place_names.shp: Point objects derived from text labels on the drawings to give the names of various schools, etc. |
| | 07 December 2000 | Page 1 of 2 |