This image was produced using Thematic Mapper bands 1, 2, 3, and 4. Band 1 was used as blue and band 3 as red. They were contrast enhanced using a gaussian stretch with a 2.5 sigma value. Green was made from a combination of bands 2 and 4. They were added together taking only 15% of band 4 and 85% of band 3. (This process "pumps up" the green in vegetation just a bit to make it look a little more realistic (a very subjective opinion for which I take total responsibility)). The file was then converted from 24-bit true color to an 8-bit GIF file. This conversion results in very little loss of information when using landsat imagery.
This image was produced using Thematic Mapper bands 3, 4, and 7. Band 4 was used as red, band 3 as green, and band 7 as blue. The image was contrast enhanced using a gaussian stretch with a 2.5 sigma value. It was then converted from a 24-bit image to an 8-bit GIF file.
This image was produced from the first three principle components applied to the six visible and near-infrared bands of this image. PC1 is displayed in red, PC2 in green, and PC3 in blue. The image was then contrast enhanced using a gaussian stretch with a 2.5 sigma value. The file was then converted from a 24-bit image to an 8-bit GIF file.
This file was produced from a 16-bit 3-Arc Second Digital Elevation Model. The image was first converted to 8-bit data (not sure of the parameters I used, but the minimum elevation of the Cuernavaca and Ciudad Altamirano 1:250,000 quad sheets was "mapped" to 0 and the maximum to 255). The image was then contrast enhanced using a gaussian stretch with a 2.5 sigma value. Since the data is b&w, it was converted to GIF and has no loss of information (other than the 16-bit to 8-bit conversion).