U.S. Department of the InteriorU.S. Geological Survey

Monthly Progress for Africa GCEV2

Jun Xiong19 March, 2015

Promotion of Tanzania Products

Demonstration of GCP(1-4)-QKM, Tanzania, 2014 to local government officials on Mar 5th , by FAO collaborator

Agreement of data sharing signed between USGS and FAO.

Moving ahead:

1) Training local officers to collect ground points using mobile app

2) Pilot 30m products in 1-2 regions of Tanzania for field-scale application & validation before this July

Field work in Pietersmertizburg, South Africa

Prasad visited South Africa in early March.

Samples created based on ground investigation, photos and Google Earth

Field work in Pietersmertizburg, South Africa

Reference map in Tanzania, 2013

Done by ICRISAT collaborator Expert supervised-SMTs Details about crop

type/intensity, irrigated/rainfed, consistent with GFSAD scheme

Help to refine our products Help to pilot work in Tanzania

30m products

Landuse map in KNZ province, South Africa, 2011

Using SPOT5 data(20m) Provided by KZN wildlife Different categories Also available in 2008 aerial photos, ground points

available Help to refine our products

Comparable with FAO statistics? GCP2014: GCP4-QKM, Africa, 2014, v1 (Reproject) FAOStat: http://faostat3.fao.org/download/Q/QC/E,

summed up "Harvest area" of aggregated crops classes

Nigeria

Congo_DRC

South SudanTanzania

Problems Sub-pixel Area on 250m pixels

(Prasad 2007) Repeated computing in FAO

statistics Single / double crops

aggregation

Thenkabail, P. S., Biradar, C. M., Noojipady, P., Cai, X., Dheeravath, V., Li, Y., … Pandey, S. (2007). Sub-pixel Area Calculation Methods for Estimating Irrigated Areas. Sensors, 7, 2519–2538.