This project was set up to investigate the level of accuracy which can be expected for slope and altitude values derived from low-cost Digital Elevation Models (DEMs). Eight gridded DEMs were generated from digitized contour maps at a range of scales:1:10,000 1:25,000 1:100,000 1:200,000 - and using a range of contour intervals 25m, 50m and 100m. A Control DEM was then produced using large scale aerial photographs (1:28,000) which were registered for auto-extraction of z-values using Helava software and accuracy tested using 91 differentially measured GPS ground control points.

This issue of Unasylva examines a number of important concepts within the current framework of trade and marketing of forest products.

All land in Zambia is vested in the president, in trust for the people of Zambia, under the Land (Conversion of Titles) Act, 1975 (see p.16), SECTION4.The president has delegated landadministration to the Commissioner of Lands under Statutory Instrument No. 7 of 1964 and GazetteNotice No. 1345 of 1975, as amended. Land in Zambia is divided into State (formerly crown),Reserve, and Trust Lands, as well as park reserves.

The State Law and Order Restoration Council Law No. 5/95 -
The 6th Waxing of Kason, 1357 ME. -
4 May 1995