摘要
以TM影像为信息源 ,在全数字方式下运用遥感技术与地理信息系统技术结合建立了宁夏林地的TM图像数据库、图形数据库和属性数据库。通过分析得出全区有林地面积 2 640 84hm2 ,占全区面积的 5 1 0 % ,其中有林地 4 2 4 38hm2 ,占 1 6 0 7% ;灌木林地 1 1 8397hm2 ,占 4 4 83% ;疏林地 750 54hm2 ,占2 8 4 2 % ;其它林地 2 81 95hm2 ,占 1 0 68%。
Using digital method of remote sensing and GIS, TM images (dated in 19 96) were interpreted and the database of forestland in Ningxia Hui Autonomous Re gion was established. The database includes TM image database, graphic database (1:100,000) and its attributing database. In order to interpret correctly, the i nterpreting insignia of various types of forestland on TM images were establishe d by analysing relative reference and images, and it have been corrected in the f ields. The definmition of forestland is that used for forestry and the the veget ation mainly consists of arbor and shrub. In practice, the forestland is categor ized into four classes according to the components. They are: 1) woodland--a rb or is the main vegetation with a coverage of over 30%, such as timber woodland, economic woodland, shelter woodland, etc.; 2) shrub land--included are shrubs an d low trees, the height of trees is less than 2 m with a coverage of more than 4 0%; 3) sparse woodland--arbor is the main vegetation with a coverage ranging b et ween 10% and 30%; 4) other forestland--all kinds of forestland except woodland , shrubland and sparse woodland. Based on field studies and analysis, the followin g conclusions are drawn: 1) In Ningxia, forestland covered 264,084 hm ２ in the mid 1990s, or 5.10% of the region's total area; 2) woodland, shrubland, sparse wood land, and other forestland cover 42,438 hm 2, 118,397 hm 2, 75,054 hm 2, and 28,195 hm 2 respectively, or 16.07%, 44.83%, 28.42% and 10.68% of the region's total fo restland accordingly; 3) comparing with traditional method, there are numerous a dvantages using digital processing method to set up forestland database, such as quick mapping, high accuracy, more economical; and 4) with same interpreting in signia and well matched image database such as graphic database, attributing dat abase, the forestland can be monitored accurately in large areas.
出处
《资源科学》
CSSCI
CSCD
北大核心
2001年第2期81-84,共4页
Resources Science
基金
中国科学院"九五"特别支持项目!"中国资源环境遥感信息系统与农情速报"(KZ95T -0 3 -0 3 -0 6 )成果
