利用收益途径、成本途径和市场调查途径三类方法，以延安市宝塔区为例进行了环境价值的评估。
As a case, the environmental value of Baota district in Yanan city is evaluated by three sorts of method, benefit, cost and market investigation.
以延安市宝塔区为试验区，测试结果表明，该系统评价结果误差小，性能可靠，可作为一种实用系统加以推广。
The experiment results of Baota district in Yanan city show that the system can be widely developed as a practical system for its little evaluation error, reliable performance.
以延安市宝塔区为试验区，测试结果表明，该系统评价结果误差小，性能可靠，可作为一种实用系统加以推广。
The experiment results of Baota district in Yanan city show that the system can be widely developed as a practical system for its little evaluation error, reliable performance.
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