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Volume 19 (1980)
- Issue 4 Pages 1-
- Issue 3 Pages 1-
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Volume 19, Issue 3
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1980 Volume 19 Issue 3 Pages 1
Published: September 10, 1980
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (1652K) -
[in Japanese]1980 Volume 19 Issue 3 Pages 2-3
Published: September 10, 1980
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (5624K) -
Iwao TSUCHIYA, Osamu MATSUDO, Shota HIROSAKI, Yojiro UTSUNOMIYA, Yukio ...1980 Volume 19 Issue 3 Pages 4-13
Published: September 10, 1980
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSUsing the limnological data of Lake Kasumigaura on July 29, 1976 as ground truth data, several numerical analyses are progressed on the LANDSAT MAP CCT which are transformed from the original LANDSAT MSS CCT.
Secchi disc transparency and chlorophill-a density maps which estimated around the whole lake water area are made by several prediction equations based on the multiple and single regression equations between observation data and LANDSAT MAP CCT data. These maps are possible to overlay on topographic maps and two digital color classification maps were made by a direct photoprinter from the same CCT.
Above mentioned numerical analyses and digital color maps are effective in the eutrophication map making based on some water quality indices (Secchi disc transparency etc.) to understand the areal pattern of the lake eutrophication phenomena.View full abstractDownload PDF (2738K) -
Ryohei Imamura, Takeo Hashimoto, Norio Shimada1980 Volume 19 Issue 3 Pages 14-21
Published: September 10, 1980
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSIn Japan, the surface moisture condition of a cultivated field has conventionally been divided into three ranks: dry, semi-dry and wet. These ranks correspond to depths of the water table, as determined by digging a pit or by hand augering, of more than 70 cm, 70 cm to 30 cm, and less than 30 cm respectively.
In this study, however, we attempted to determine surface moisture by photo interpretation using panchromatic photographs taken in before the riceplanting, in May 1973 Yokote Basin, in Akita prefecture.
Landforms of the alluvial plain, defined according to their constituent materials which to a large extent, control the surface moisture condition. Surface moisture condition at each landform unit was closely related to the average photographic density.
In this study, the moisture condition of the cultivated field was divided into four ranks: (1) dry, (2) semi-wet, (3) wet and (4) extremely wet, based on the result of geomorphologic classification and tone grade.
According to the check hand-drilling in the field, the results were recognized to have a 70 % accuracy. Moreover, in most cases where there was a discrepancy, both the photointerpretation rating and the actual soil condition were wetter than the rating based on water table depth. Consequently, classification of ground water level by the photointerpretation is judged to be sufficient accurate for practical use.View full abstractDownload PDF (1009K) -
[in Japanese]1980 Volume 19 Issue 3 Pages 22-24
Published: September 10, 1980
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (2076K) -
1980 Volume 19 Issue 3 Pages 25-37
Published: September 10, 1980
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (715K)
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