Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

damen, m. c. j.

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Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856641294

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: IX Seiten, Seiten 551-956

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A,. A. Balkema

Identifier (digital):: 856641294

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,2)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Damen, M. C. J.

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 6 Hydrology: Surface water, oceanography, coastal zone, ice and snow. Chairman: K. A. Ulbricht, Co-chairman: Mikio Takagi, Liaison: R. Spanhoff

Write comment:: Wegen zu enger Bindung kommt es teilweise im Original zu Textverlust.

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Rainlog and preslog: Novel tools for in-situ measurements. D. de Hoop

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 707 Rainlog and preslog: Novel tools for in-situ measurements D.de Hoop International Institute for Aerospace Survey and Earth Sciences (ITC), Enschede, Netherlands 1. INTRODUCTION The rainlog and preslog electronic water level log gers were developed at the International Institute for Aerospace Survey and Earth Sciences (ITC), Enschede, and after some redesigning, are produced by Siemens Netherlands, The Hague. The instruments measure and record water pressure over long periods (for example, at sixty minutes intervals for a period of 12 months) without requir ing maintenance or changing of batteries. Expensive test stations are not required. The loggers, togeth er with the data-processing facilities, provide a new scientific approach to field measurements. The pressure recordings ar.e controlled by a micro processor and are stored in a removable internal memory block (the "Eprom"). The capacity of the Eprom is 10240 records. The records are read by a personal computer (Epson, type PX-8) with an "Eprom reader". Depending on the software chosen the re sults can be presented raw or in calculated form. Two types of loggers are available; both have the same electronics. The difference is based on the type of sensor used. Rainlog has a relative pressure sensor; preslog has an absolute pressure sensor. The standard range for rainlog is 2 meters. The standard range for preslog is 0 to 4 bar, which at sea level is equivelent to a range of 30 meters. The precision of the measurements is approximately 0.2 percent for preslog and 0.5 percent for rainlog. The resolution is 2000 for the rainlog and 4000 for the 4 bar-type preslog. The measuring interval can be set between 30 seconds and 60 minutes (60 minutes is standard). A built-in audio signal provides an operational check. The loggers were designed for both accuracy and durability. Durability requires permanent attachment to the internal panel of all parts except the remov able memory block (Eprom) and also very firm place ment of the panel in the steel cylinder. Opening the cylinder to replace the Eprom or to re-set the re cording interval requires a vise, which is usually not available at a test site. We therefore recommend transporting the entire logger to a field office where the necessary equipment can be kept and where there is less danger of damage to the Eprom. 1.1 Preslog applications River level To record river levels, a logger must be anchored in the riverbed. After installation, it is left for a maximum period of 12 months. The instrument func tions without disturbance, despite shifting bottom sand and gravel. After the operating period, the logger must be retrieved and opened; the memory block is removed and read by the personel computer. An additional "dry" preslog is required for barome tric correction. One dry logger covers an extensive area and thus can be combined with several wet loggers. Groundwater level Preslog can also function as a groundwater level logger. Its three inch diameter allows placement in waterpipes for pump-test. Data from several tests can be recorded in sequence by placing a "marker" in the recorded data to indicate the end of one test and the beginning of the next. 1.2 Rainlog applications To record rainfall, a rainlog is connected to the bottom of a rain collection container. Only in creases in pressure are recorded. Decreases in pressure caused by evaporation or emptying the container are ignored. A simple program later shows the results of a year's data collection.

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