Landscape pattern index
| Landscape Pattern Index . | Index Name . | Index Range and Meaning . |
|---|---|---|
| CA | area of plaques type, unit: hm2 | CA > 0, reflecting the dominant plaques and inferior plaques type in the landscape |
| NP | number of plaques, unit: piece | NP > 0, reflecting the number of plaques of the type |
| PD | plaques density, unit: piece/100 hm2 | PD > 0, reflecting the number of certain landscape plaques per unit area; if the PD value becomes larger, the landscape tends to be composed of mostly smaller plaques |
| ED | edge density, unit: m/hm2 | ED ≥ 20, an indicator of plaques shape, indicating the degree of landscape fragmentation; the larger the ED value, the greater the degree of landscape fragmentation and the more dispersed the layout |
| AREA_MN | average plaques area, unit: hm2 | AREAMN > 0, reflecting the fragmentation degree of the type landscape; the smaller the value, the higher the fragmentation degree of the plaques, and the landscape tends to be composed of mostly smaller plaques |
| COHESION | cohesion index | 0 < COHE SION < 100, reflecting the degree of connectivity of the class landscape; the higher the value, the higher the degree of aggregation or interconnectivity of the class landscape, and vice versa, the smaller |
| CONTAG | spreading index | O < CONTAG ≤ 100, reflecting the connectivity of the dominant landscape; the larger the value, the higher the integrity of the landscape pattern |
| AI | aggregation index | O ≤ AI ≤ 100, reflecting the degree of aggregation of plaques; if the AI value becomes smaller, the landscape tends to be composed of smaller plaques with uniform distribution; if the AI value becomes larger, the landscape is composed of a smaller number of large plaques or highly connected between plaques |
| DIVISION | division index | 0 ≤ DIVISION < 1, reflecting the fragmentation degree of the landscape; when the value is 0, the landscape is composed of single plaques; the larger the value, the higher the degree of fragmentation of the landscape by different plaques |
| SHDI | SHDI diversity index | SHDI ≥ 0, reflecting the heterogeneity of the landscape; the higher value indicates the increase of plaque types or the tendency of the plaques in the landscape to homogenize the distribution |
| SHEI | SHEI evenness index | O ≤ SHEI ≤ 1, indicating the maximum possible diversity of the landscape under a certain landscape abundance; the higher the value, the more stable the regional ecosystem tends to be; the lower the value; the lower the regional ecosystem stability accordingly |
| Landscape Pattern Index . | Index Name . | Index Range and Meaning . |
|---|---|---|
| CA | area of plaques type, unit: hm2 | CA > 0, reflecting the dominant plaques and inferior plaques type in the landscape |
| NP | number of plaques, unit: piece | NP > 0, reflecting the number of plaques of the type |
| PD | plaques density, unit: piece/100 hm2 | PD > 0, reflecting the number of certain landscape plaques per unit area; if the PD value becomes larger, the landscape tends to be composed of mostly smaller plaques |
| ED | edge density, unit: m/hm2 | ED ≥ 20, an indicator of plaques shape, indicating the degree of landscape fragmentation; the larger the ED value, the greater the degree of landscape fragmentation and the more dispersed the layout |
| AREA_MN | average plaques area, unit: hm2 | AREAMN > 0, reflecting the fragmentation degree of the type landscape; the smaller the value, the higher the fragmentation degree of the plaques, and the landscape tends to be composed of mostly smaller plaques |
| COHESION | cohesion index | 0 < COHE SION < 100, reflecting the degree of connectivity of the class landscape; the higher the value, the higher the degree of aggregation or interconnectivity of the class landscape, and vice versa, the smaller |
| CONTAG | spreading index | O < CONTAG ≤ 100, reflecting the connectivity of the dominant landscape; the larger the value, the higher the integrity of the landscape pattern |
| AI | aggregation index | O ≤ AI ≤ 100, reflecting the degree of aggregation of plaques; if the AI value becomes smaller, the landscape tends to be composed of smaller plaques with uniform distribution; if the AI value becomes larger, the landscape is composed of a smaller number of large plaques or highly connected between plaques |
| DIVISION | division index | 0 ≤ DIVISION < 1, reflecting the fragmentation degree of the landscape; when the value is 0, the landscape is composed of single plaques; the larger the value, the higher the degree of fragmentation of the landscape by different plaques |
| SHDI | SHDI diversity index | SHDI ≥ 0, reflecting the heterogeneity of the landscape; the higher value indicates the increase of plaque types or the tendency of the plaques in the landscape to homogenize the distribution |
| SHEI | SHEI evenness index | O ≤ SHEI ≤ 1, indicating the maximum possible diversity of the landscape under a certain landscape abundance; the higher the value, the more stable the regional ecosystem tends to be; the lower the value; the lower the regional ecosystem stability accordingly |
Note: The formula for calculating a specific landscape index refers to the Fragstats 4.2 help file.