Urban growth pattern of the San Antonio area San Antonio population as of April 1, 1980 – 785,880 Average population of San Antonio for 1985 – 860,906 average between 1980 and 1990 San Antonio population as of April 1, 1990 – 935,933 San Antonio population as of April 1, 2000 – 1,144,646 % change in population from 1980 to 1990 = 19% % change in population from 1990 to 2000 = 22% % change in population from 1980 to 2000 = 46%

Received the image for San Antonio for 1986 from Dr. Xie Used the image for San Antonio for 2003 from the images given to in class from Dr. Xie The image for 1986 was larger than the image for 2003 Dr. Xie took the pixel location for the top left hand corner and the bottom right hand corner of the 2003 San Antonio image Dr. Xie inputted these locations into the image for 1986 to so that they would be the same size and the same geographic location.

San Antonio in 1986 after the size change

San Antonio in 2003

Braunig Lake 1986 2003

1604 and I-10 Interchange Now Fiesta Texas Quarry is larger 1986 2003

Kelly Air Force Base 1986 2003

Hwy 281 and Loop 1604 2003 1986

San Antonio Airport 2003 1986

Isodata unsupervised classification Isodata calculates class means evenly distributed in the data space and then iteratively clusters the remaining pixels using minimum distance techniques. Each iteration recalculates means and reclassifies pixels with respect to the new means. Iterative class splitting, merging, and deleting is done based on input threshold parameters. All pixels are classified to the nearest class unless a standard deviation or distance threshold is specified, in which case some pixels may be unclassified if they do not meet the selected criteria. This process continues until the number of pixels in each class changes by less than the selected pixel change threshold or the maximum number of iterations is reached.

Isodata image of San Antonio with Maximum Iterations set to 5 9 different classes (colors) 10 different classes (colors)

Braunig Lake Isodata Image - 2003 Isodata Image - 1986

1604 and I-10 Interchange Isodata Image - 2003 Isodata Image - 1986

Pixel Count for Isodata Difference Initial State Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8 Class 9 Class Total 50435 1264501 1181173 594792 263209 81589 31816 590326 145951 Class 10 Final State

Percentage for Isodata Difference Initial State Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8 Class 9 Class Total 100 Final State

K-Means unsupervised classification K-Means calculates initial class means evenly distributed in the data space and then iteratively clusters the pixels into the nearest class using a minimum distance technique. Each iteration recalculates class means and reclassifies pixels with respect to the new means. All pixels are classified to the nearest class unless a standard deviation or distance threshold is specified, in which case some pixels may be unclassified if they do not meet the selected criteria. This process continues until the number of pixels in each class changes by less than the selected pixel change threshold or the maximum number of iterations is reached.

K-Means image of San Antonio with Maximum Iterations set to 5 5 different classes (colors)

Braunig Lake K-Means Image - 2002 K-Means Image – 1986

1604 and I-10 Interchange K-Means Image - 2002 K-Means Image - 1986

Pixel Count for K-Means Difference Initial State Class 1 Class 2 Class 3 Class 4 Class 5 Class Total 524655 1289047 1327614 898480 163996 Final State

Percentage for K-Means Difference Initial State Class 1 Class 2 Class 3 Class 4 Class 5 Class Total 100 Final State

What I did to find the pixel difference for the Isodata Classification On the ENVI Main Menu Click Classification -> Click Post Classification -> Class Statistics Choose Classification Input file - Isodata Image for 1986 Choose Statistics Input file – Isodata for 1986 Selected All items Asked for a Text Report Repeated steps for the Isodata for 2003

Class Stats Summary for 1986 Class Stats Summary for 2003 Class 1 – 50565 points (1.2011%) Class 2 – 1266857 points (30.0916%) Class 3 – 1182127 points (28.0790%) Class 4 – 595314 points (14.1405%) Class 5 – 263499 points (6.2589%) Class 6 – 81625 points (1.9388%) Class 7 – 31823 points (0.7559%) Class 8 – 592105 points (14.0643%) Class 9 – 146085 points (3.4700%) Class Stats Summary for 2003 Class 1 – 145531 points (3.8298%) Class 2 – 584474 points (15.3809%) Class 3 – 636504 points (16.7501%) Class 4 – 577702 points (15.2027%) Class 5 – 533950 points (14.0513%) Class 6 – 467833 points (12.3114%) Class 7 – 275965 points (7.2622%) Class 8 – 146022 points (3.8427%) Class 9 – 42091 points (1.1077%) Class 10 – 389928 points (10.2613%) % Difference For: class 1 = 188% class 6 = 473% class 2 = -54% class 7 = 767% class 3 = -46% class 8 = -75% class 4 = -3% class 9 = -93% class 5 = 103%