Choice and Effect Analysis of Displaying Scale of the Visual Interpretation of TM Image:A Case Study on the Ecotones between the Oases and Deserts in the Inland River Basin
Landscape map,one of the main data forms of landscape ecology obtained by visual interpretation of TM image,is affected by displaying scale in visual interpretation. Adopting optimal displaying scale could minimize data errors in interpretation. This paper takes the ecotones between the oases and deserts, key research region and sensitive to displaying scales, as a case study. Five landscape maps were obtained by visual interpreting TM images at 1:50 000,1 = 75 000,1 = 100 000,l:125 000 and 1: 150 000 displaying scales. By dividing patch area grades and patch shape grades based on landscape maps,a new patch types system was established. Then landscape indices and transfer matrices were calculated to reflect interpret precision. The results indicated that,the displaying scales were divided to three sections:greater than 1 = 75 000,between 1 = 75 000 and 1 = 125 000 and less than 1 = 125 000. 1 = 75 000 with high data precise and abundant information was the appropriate displaying scale for interpreting ecotones between the oases and deserts.
TM imagevisual interpretationscale effectsecotones between the oases and deserts
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