The new images of the state of Goiás and the Federal District are already available on the IBGE’s website. They are part of a project which aims at generating orthoimages from the AVNIR-2 sensor (of the ALOS satellite), which will cover several states of the Federation. The project, conceived in order to make orthoimages, mosaics and image-maps available to society, has the purpose of meeting the demands of updated information compatible with the scale 1:100 000.

The result is the orthorectification (correction of distortions caused by the relief and imaging geometry) of 173 images which thoroughly cover the State of Goiás and the Federal District. The orthoimages were mosaicked and cut in 150 sheets, in accordance with the articulation of the 1:100.000 scale of the National Cartographic System. Radiometric enhancement was applied to the mosaic sheets in order to provide a better visualization and interpretation of elements.

The orthoimages and the mosaicked sheets, in GeoTIFF format, are available at ftp://geoftp.ibge.gov.br/imagens_orbitais/

Part of the set of the image-maps that cover the state are also available to download, in PDF format, at ftp://geoftp.ibge.gov.br/imagens_do_territorio/imagens_corrigidas/cartas_imagem/bc100//.

For further information, access the link

ftp://geoftp.ibge.gov.br/imagens_do_territorio/imagens_corrigidas/ortomosaicos/bc100/descritivo_Projeto_BC100_GO_DF_situacao2012_out.pdf

The sensor AVNIR-2 images have a spatial resolution of ten meters, in four spectral bands equivalent to blue, green, red and near infrared. The images used refer back to the years from 2007 to 2010, 60% of them are concentrated in 2009 and 2010.

Of general interest, the mosaic is primarily addressed to geosciences studies and work, focusing on engineering, geography and cartography.