+For regional texturing, support by the following people and organization is
+gratefully acknowledged:
+
+ - Instituto Brasileiro de Geografia e Estatistica (IBGE) for the
+ satellite images of the Brazilian cerrado:
+ http://downloads.ibge.gov.br/downloads_geociencias.htm
+
+ - Diogo Sergio for the image of the caatinga trees:
+ http://commons.wikimedia.org/wiki/File:Caatinga_Xiquexique_pedras_01.JPG
+
+ - Maria Hsu for the image of a caatinga tree:
+ https://www.flickr.com/photos/14323530@N05/2150992479/
+
+ - Leonardo "Leguas" Carvalho for the image of the Ipe-Amarelo tree:
+ http://pt.wikipedia.org/wiki/Ficheiro:Ipe_detail.jpg
+
+ - Spoladore for the image of the Lixeira tree:
+ http://pt.wikipedia.org/wiki/Cajueiro-bravo-do-campo#/media/File:Lixeira_do_cerrado_de_Mato_Grosso.JPG
+
+ - Otávio Nogueira for the image of a cerrado tree:
+ https://www.flickr.com/photos/55953988@N00/3896942038
+
+ - P199 for the image of Las Piñas City, the Philippines:
+ http://commons.wikimedia.org/wiki/File:Las_Pinas_City.jpg
+