Description of GIS Layers
Coordinate System:  GCS_Arc1960
1.		Agroecological_zones
Agro-ecological zones (AEZs) are defined as natural physical regions which are in broad sense uniform in climate, physiography and soil patterns, for a generalized description and evaluation of agricultural potential and constraints (De Pauw 1984). AEZs are distinguished based on soil types;   total annual rainfall and pattern (Mono vs Bimodal); Length of growing season; and altitude.  
The AEZs were mapped based on ISRIC (International Soil Reference and Information Centre) land resource zones. 
Source:   International Soil Reference and Information Centre (ISRIC), 

2.	Brn_asdp_projects
The layer maps districts identified for Big Result Now (BRN) and Agricultural Sector Development Programme (ASDP) projects in Tanzania. In addition, the layer locates (Districts) according to different categories of BRN projects, i.e. Warehouse, Irrigation, and big farms
Source: Amy Faust, UK Department for International Development/World Bank | Dar es Salaam, Tanzania
3.	Crop_livestock_hazards
Crop and livestock hazard layer maps locations (livelihood zone) where diseases and pests for crops and livestock were ranked  either as the first or second important hazard to a particular livelihood zone. The ranking was done in 2008 during the workshops conducted by FEWS NET Tanzania .
Source:   USAID, 2008. Preliminary Rural Livelihood Zoning: Tanzania. A.  A special report by the famine early warning system network (FEWS NET).

4.	Frequency_ew-sd
This layer maps the frequency of occurrence of extreme wet conditions (ew) and severe drought (sd) between 1963 and 2006 for a selected weather stations in Tanzania.
Source: Tanzania Meteorological Agency (TMA)

5.	Main_livelihood_zones
Livelihood zone is an area within which people share broadly the same patterns of livelihood. A spatial analysis of livelihood is key in understanding how people in an area will be affected by different hazards such as drought, floods, crop and livestock diseases, and market failure. The information can also provide a base for monitoring food security among a population.
Main livelihood zones were mapped by digitizing summarized livelihood zones (from 78 to 14) initially produced in 2008 by FEWS NET.
Source:   USAID, 2008. Preliminary Rural Livelihood Zoning: Tanzania. A.  A special report by the famine early warning system network (FEWS NET).

6.	Poverty_index
Poverty index map was produced based on poverty indices produced by TASAF (Tanzania Social Action Fund). TASAF estimated poverty level for each district using data on population, social service availability, primary school enrolment rate, maternal mortality rate, most vulnerable children, disabled people, household food insecurity, government development spending in health and education and social assistance received from national and international organizations (apart from the government). Poverty was categorized into four strata and indices: Highest, High, Medium, and Low

7.	Vulnerability_food_insecurity
The layer maps the probability of occurrence of food insecurity in different districts of Tanzania. The probability was based on food situation recalls from the last six seasons, i.e. 2007/08, 2008/09, 2009/2010, 2010/11, 2011/12, and 2012/13.
Source: Crop Monitoring and Early Warning National Food Security Division, Ministry of Agriculture Food Security and Cooperatives, 2012. Agstats for Food Security Volume 1: The 2011/12 Preliminary Food Crop Production Forecast for 2012/13 Food Security, Appendix 5.  Dar es Salaam