geographic pattern
1.Digital Terrain Model display two demission geographic position and relational properts information with digital pattern. DTM is an important component of Gis,and is basic of "digital earth".
2.Both grid mapping and grid computing are effective methods to describe, analyze and virtualize regional geographic phenomena and their applications to the analysis of the spatial pattern are quite promising.
3.2) The main geographical elements of the exotic weed genera were Cosmopolitan,Pantropic,North Temperate,Tropical Asia & Tropical America disjuncted,Old World Temperate,accounting for 39.47%,21.05%,18.42%,13.16% of the total respectively(excluding cosmopolitan). Compared with the flora geographic elements of Mount Bei in Jinhua,higher tropical proportion was found in alien weed,and special attention should be paid to species with Tropical Asia & Tropical America disjuncted distribution pattern;
4.Thornthwaite′s method on calculating PE and climatic classificationhas been applied on computing data from 671 climatological observationstations in China. A geographic regression model of potential evapotran-spiration is resulted as APE=2037. 98-18. 8308LAT-4.5801 LONG-0.157861ALT. The resulted APE and moisture index, Im are closely cor-related with the major vegetation types and their distribution pattern inChina.
