一、前言土壤水分遥感可依据可见近红外、热红外和微波等遥感谱段的信息进行研究。其中,基于最重要的物理模型是热惯量模式的研究。但是,在过去的研究中对其物理意义认识不足,因此,宇都宫和山口(1986,1987)以及Utsunomiya(1988,1989)等...一、前言土壤水分遥感可依据可见近红外、热红外和微波等遥感谱段的信息进行研究。其中,基于最重要的物理模型是热惯量模式的研究。但是,在过去的研究中对其物理意义认识不足,因此,宇都宫和山口(1986,1987)以及Utsunomiya(1988,1989)等学者作了进一步地研究与改进(宇都宫1990)。近些年来,由于大气中CO_2不断增加而气候趋于温暖化,受此影响,可预测未来土壤水分趋于严重不足(Manabe et al.1981),这是众所用知的气候变迁的重要问题。为了研究更大区域的土壤水分分布状态,开发测定土壤水分变化的方法,本次以地处中国东北部的吉林省为中心,进行了区域土壤水分调查,现将阶段性调查研究结果报告如下。本研究得到了中国科学院长春净月潭遥感实验站的大力支持和协作,因此,本成果是日中科学工作者共同协力完成的。展开更多
The Chinese people began to research the main source of the Changjiang (Yangtze) River 2,400 years ago. Limited by the scientific level, they did not discover it.The Tuotuo River was determined as the main source of t...The Chinese people began to research the main source of the Changjiang (Yangtze) River 2,400 years ago. Limited by the scientific level, they did not discover it.The Tuotuo River was determined as the main source of the Changjiang River in the 1970s. However, this was not correct, because when comparing the length of the Tuotuo River with the Dam River, the glacier length at the headwaters was added to the Tuotuo River, resulting in that the Tuotuo River is 1 km longer than the Dam River, keeping in mind that the glacier can not be regarded as part of the river.In the summer of 1986, we investigated the source of the Changjiang River, we accurately measured the length of both the Tuotuo and Dam rivers, we discovered that the Dam River was 353.1 km long, and the Tuotuo River was 346.3 km long, the Dam River thus being 6.8 km longer than the Tuotuo River. The discharge of the Dam River is 196.18 m3/ sec., 2.6 times as large as that of the Tuotuo River, that of the Tuotuo River is 75.10 m3/sec. The展开更多
It is efficient and reliable to investigate the reed resources of Bosten Lake in Xinjiang, characterized by complicated types of reed land and very different reed growth using colour infrared aerial photos, Landsat im...It is efficient and reliable to investigate the reed resources of Bosten Lake in Xinjiang, characterized by complicated types of reed land and very different reed growth using colour infrared aerial photos, Landsat images and multi band imagery. At first, on the basis of Landsat images and relevant data, we analyzed the ecological environment of the studied area, the characteristics of reed land types and imaging mechanism to determine the program for abstracting remote sensing information and aerial photographic conditions:On the processed Landsat images and aerial photos, we considered typically geographic features and reed land types, preselected ground sampling sections and sites, then determined indexes classifying reed land types according to sampling data and image characteristics, established various interpretation keys, drew distribution maps of reed land types and measured the area of various types of reed land following geometric correction. On the other hand, based on sampling values and展开更多
文摘一、前言土壤水分遥感可依据可见近红外、热红外和微波等遥感谱段的信息进行研究。其中,基于最重要的物理模型是热惯量模式的研究。但是,在过去的研究中对其物理意义认识不足,因此,宇都宫和山口(1986,1987)以及Utsunomiya(1988,1989)等学者作了进一步地研究与改进(宇都宫1990)。近些年来,由于大气中CO_2不断增加而气候趋于温暖化,受此影响,可预测未来土壤水分趋于严重不足(Manabe et al.1981),这是众所用知的气候变迁的重要问题。为了研究更大区域的土壤水分分布状态,开发测定土壤水分变化的方法,本次以地处中国东北部的吉林省为中心,进行了区域土壤水分调查,现将阶段性调查研究结果报告如下。本研究得到了中国科学院长春净月潭遥感实验站的大力支持和协作,因此,本成果是日中科学工作者共同协力完成的。
文摘The Chinese people began to research the main source of the Changjiang (Yangtze) River 2,400 years ago. Limited by the scientific level, they did not discover it.The Tuotuo River was determined as the main source of the Changjiang River in the 1970s. However, this was not correct, because when comparing the length of the Tuotuo River with the Dam River, the glacier length at the headwaters was added to the Tuotuo River, resulting in that the Tuotuo River is 1 km longer than the Dam River, keeping in mind that the glacier can not be regarded as part of the river.In the summer of 1986, we investigated the source of the Changjiang River, we accurately measured the length of both the Tuotuo and Dam rivers, we discovered that the Dam River was 353.1 km long, and the Tuotuo River was 346.3 km long, the Dam River thus being 6.8 km longer than the Tuotuo River. The discharge of the Dam River is 196.18 m3/ sec., 2.6 times as large as that of the Tuotuo River, that of the Tuotuo River is 75.10 m3/sec. The
文摘It is efficient and reliable to investigate the reed resources of Bosten Lake in Xinjiang, characterized by complicated types of reed land and very different reed growth using colour infrared aerial photos, Landsat images and multi band imagery. At first, on the basis of Landsat images and relevant data, we analyzed the ecological environment of the studied area, the characteristics of reed land types and imaging mechanism to determine the program for abstracting remote sensing information and aerial photographic conditions:On the processed Landsat images and aerial photos, we considered typically geographic features and reed land types, preselected ground sampling sections and sites, then determined indexes classifying reed land types according to sampling data and image characteristics, established various interpretation keys, drew distribution maps of reed land types and measured the area of various types of reed land following geometric correction. On the other hand, based on sampling values and
