Case Study:
Guatemala
Date range of image:
1979 to 2000
A reliable method often used to quantify intense changes to a landscape is by comparing NDVI supervised classifications and their accompanying area summary reports. For the Nebaj & Acul region of the Ixil Triangle, three supervised class regions were designated to represent: “heavy vegetation” (heavily-wooded areas); “medium vegetation” (agriculture, mixed vegetation, and disbursed vegetation); and “light to no vegetation” (open ground, exposed soil, urban areas, roads, and perimeter vegetation) in the false colors representation red, salmon, and turquoise respectively. The results can be viewed in Figures 1, 2, and 3 and the accompanying area summary reports below.
Nebaj & Acul Region Summary Reports
Figure 1: Nebaj & Acul Lands at MSS 1979 | NDVI Supervised Classification
Class/Region | Hectares | Sq. Km | Acres | Sq. Miles |
Heavy Vegetation | 3520.127 | 35.201 | 8698.423 | 13.591 |
Medium Vegetation | 2223.105 | 22.231 | 5493.413 | 8.583 |
Light to No Vegetation | 236.738 | 2.367 | 584.992 | 0.914 |
All | 5981.409 | 59.814 | 14780.385 | 23.094 |
Figure 2: Nebaj & Acul Landsat TM 1986 | NDVI Supervised Classification
Class/Region | Hectares | Sq. Km | Acres | Sq. Miles |
Heavy Vegetation | 1984.002 | 19.840 | 4902.576 | 7.660 |
Medium Vegetation | 2240.186 | 22.402 | 5535.619 | 8.649 |
Light to No Vegetation | 1742.357 | 17.424 | 4305.459 | 6.727 |
All | 5981.409 | 59.814 | 14780.385 | 23.094 |
Figure 3: Nebaj & Acul Landstat ETM+ 2000 | NDVI Supervised Classification
Class/Region | Hectares | Sq. Km | Acres | Sq. Miles |
Heavy Vegetation | 1758.440 | 17.584 | 4345.200 | 6.789 |
Medium Vegetation | 2906.312 | 29.063 | 7181.653 | 11.221 |
Light to No Vegetation | 1308.210 | 13.082 | 3232.657 | 5.051 |
All | 5981.409 | 59.814 | 14780.385 | 23.094 |