scholarly journals Past and Present Practices of Topographic Base Map Database Update in Nepal

2020 ◽  
Vol 9 (6) ◽  
pp. 397 ◽  
Author(s):  
Nimisha Wagle ◽  
Tri Dev Acharya
Keyword(s):  
Land Use Planning ◽  
Data Quality Control ◽  
Vector Data ◽  
Contour Maps ◽  
Contour Lines ◽  
High Resolution Imagery ◽  
Field Data Collection ◽  
History Of ◽  
Quality Maps ◽  
Topographic Base

Topographic Base Maps (TBMs) are those maps that portray ground relief as the form of contour lines and show planimetric details. Various other maps like geomorphological maps, contour maps, and land use planning maps are derived from topographical maps. In this constantly changing world, the update of TBMs is indispensable. In Nepal, their update and maintenance are done by the Survey Department (SD) as a national mapping agency. This paper presents the history of topographical mapping and the reasons for the lack of updates. Currently, the SD is updating the TBM database using panchromatic and multispectral images from the Zi Yuan-3 (ZY-3) satellite with a resolution of 2.1 and 5.8 m, respectively. The updated methodology includes the orthorectification of images, the pansharpening of images, field data collection, digitization, change detection, and updating, the overlay of vector data and field verification, data quality control, and printing map production. A TBM in the Dang district of Nepal is presented as casework to show the changes in the area and issues faced during the update. Though the present digitizing procedure is time-consuming and labor-intensive, the use of high-resolution imagery has made mapping accurate and has produced high-quality maps. However, audit and automation can be introduced from the experiences of other countries for accurate and frequent updates of the TBM database in Nepal.

Regeneration methods for dipterocarp forests of wet tropical Asia

2003 ◽  
Vol 79 (2) ◽  
pp. 263-267 ◽  
Author(s):  
Mark S Ashton
Keyword(s):  
Land Use Planning ◽  
Forest Type ◽  
Forest Products ◽  
The Philippines ◽  
Tropical Asia ◽  
Ecological Principles ◽  
Dipterocarp Forests ◽  
Non Timber Forest Products ◽  
History Of ◽  
Wet Tropics

Dipterocarp forests of the Asian wet tropics have a long history of silvicultural research. This paper provides a review of this history and a summary of the ecological principles guiding the regeneration methods used. Dipterocarp forests are here defined as those of the seasonally wet regions of Thailand, Burma, and India, and those that are considered of the mixed dipterocarp forest type that dominate the aseasonal wet regions of Sri Lanka, Malaysia, and parts of Indonesia and the Philippines. Two silvicultural regeneration methods are described, shelterwoods and their variants, and selection systems. Both systems can be justified but emphasis is given to the development of shelterwood and selection regeneration methods that are tailored to the particular biological and social context at hand. The paper concludes with a call for improved land-use planning and stand typing to better integrate service and protection values with those values focused on commodity production. Key words: Dipterocarpus, hill forest, non-timber forest products, polycyclic, regeneration, selection, shelterwood, Shorea

E-Planning through the Wisconsin Land Information Program

2013 ◽  
pp. 1525-1540
Author(s):  
Patrice Day ◽  
Rina Ghose
Keyword(s):  
Land Use Planning ◽  
Records Management ◽  
Budget Deficits ◽  
State Budget ◽  
Grass Roots ◽  
Funding Mechanism ◽  
Information Program ◽  
History Of ◽  
Local Government Level

Through the lenses of Critical GIS and political economy, this paper examines the history of the Wisconsin Land Information Program (WLIP), which was created in 1989 and provides an early US example of the adoption of GIS at the local government level. Using a mixed methods approach and a case study design, the authors focus on the cooperation and conflicts among various actors and networks, at and between scales, during times of plentiful and lean resources. Catalyzed by the 1978 Larsen Report, the WLIP was unique in its inclusiveness of everyone involved in land records management. University academics brought together all the stakeholders to create a thematic and territorial network with political power and a unique funding mechanism. As land use planning and state budget deficits became prominent, the program became a target, leading to conflict and power struggles, particularly with the state Department of Administration (DOA). What began as an egalitarian, grass-roots, socially just, forward-thinking program has shape-shifted, and while the WLIP is still a viable and functioning program, its egalitarian goals have been subverted by economics.

scholarly journals A History of Jökulhlaups from Strandline Lake, Alaska, U.S.A.

1985 ◽  
Vol 31 (109) ◽  
pp. 272-280 ◽  
Author(s):  
Matthew Sturm ◽  
Carl S. Benson
Keyword(s):  
North America ◽  
Release Mechanism ◽  
Contour Maps ◽  
Outburst Floods ◽  
Before And After ◽  
Glacier Ice ◽  
History Of ◽  
Subglacial Drainage

AbstractJökulhlaups, also known as outburst floods, have occurred every 1 to 5 years from Strandline Lake, one of the largest glacier-dammed lakes in North America. The development of a distinct calving embayment in the lobe of Triumvirate Glacier which dams the lake, as well as the filling of a number of supraglacier pools, appear to be reliable precursors to a jökulhlaup. Analysis of contour maps made from photographs taken immediately before and after the jökulhlaup of 17 September 1982 indicate that over 95% of the lake drains, a volume of approximately 7 × 108 m3 of water. The glacier lobe which dams the lake fractures and subsides during a jökulhlaup, indicating that the release mechanism is hydrostatic lifting of the ice off of a sub-glacial spillway. Evidence from the ice-free margins of the glacier suggests that the spillway may be controlled by bedrock. Large variation in the refilling period of Strandline Lake indicates that the subglacial drainage tunnels can remain open for as much as a few years after a jökulhlaup, before they become sealed by sediments and/or glacier ice.

scholarly journals A History of Jökulhlaups from Strandline Lake, Alaska, U.S.A.

1985 ◽  
Vol 31 (109) ◽  
pp. 272-280 ◽  
Author(s):  
Matthew Sturm ◽  
Carl S. Benson
Keyword(s):  
North America ◽  
Release Mechanism ◽  
Contour Maps ◽  
Outburst Floods ◽  
Before And After ◽  
Glacier Ice ◽  
History Of ◽  
Subglacial Drainage

AbstractJökulhlaups, also known as outburst floods, have occurred every 1 to 5 years from Strandline Lake, one of the largest glacier-dammed lakes in North America. The development of a distinct calving embayment in the lobe of Triumvirate Glacier which dams the lake, as well as the filling of a number of supraglacier pools, appear to be reliable precursors to a jökulhlaup. Analysis of contour maps made from photographs taken immediately before and after the jökulhlaup of 17 September 1982 indicate that over 95% of the lake drains, a volume of approximately 7 × 108m3of water. The glacier lobe which dams the lake fractures and subsides during a jökulhlaup, indicating that the release mechanism is hydrostatic lifting of the ice off of a sub-glacial spillway. Evidence from the ice-free margins of the glacier suggests that the spillway may be controlled by bedrock. Large variation in the refilling period of Strandline Lake indicates that the subglacial drainage tunnels can remain open for as much as a few years after a jökulhlaup, before they become sealed by sediments and/or glacier ice.

GEOPHYSICAL HISTORY OF PARENTIS OIL FIELD, FRANCE

Geophysics ◽  
1956 ◽  
Vol 21 (3) ◽  
pp. 815-827 ◽  
Author(s):  
Raoul Vajk ◽  
George Walton
Keyword(s):  
Cross Sections ◽  
Gravity Anomalies ◽  
Oil Field ◽  
Seismic Profiles ◽  
Contour Maps ◽  
History Of ◽  
Standard Oil Company ◽  
Aquitaine Basin ◽  
Surface Geology ◽  
Gravity Map

In 1951, the French Government granted an exclusive exploration permit to the Esso R.E.P. (a Standard Oil Company affiliate) over an area of 4,357,980 acres around Bordeaux in the northern part of the Aquitaine Basin, France. This area was investigated first by surface geology; then it was surveyed by the gravity meter. In checking the gravity anomalies by the reflection seismograph, a subsurface structure was found at Parentis in 1953, which was drilled in 1954, and was proved to be oil bearing. The Parentis oil field is the most important oil field, not only in France, but in all Europe outside the Iron Curtain. Gravity map, seismograph map, seismic profiles, telluric map and geological contour maps, and cross sections of the Parentis structure are presented.

A Study of Seismic Risk near Pipeline Corridors in Northwestern Canada and Eastern Alaska

1974 ◽  
Vol 11 (1) ◽  
pp. 147-164 ◽  
Author(s):  
A. E. Stevens ◽  
W. G. Milne
Keyword(s):  
Northwest Territories ◽  
Seismic Risk ◽  
Yukon Territory ◽  
Red River ◽  
Contour Maps ◽  
History Of ◽  
Strain Release ◽  
Fort Mcpherson ◽  
Risk Parameters ◽  
Large Earthquakes

Seismic risk in the Yukon Territory and adjacent areas of the western Northwest Territories and eastern Alaska is evaluated from locations and magnitudes of earthquakes in northern Canada and Alaska from 1899 to 1970. Contour maps illustrate strain release and also predicted accelerations on firm soil for return periods of 30, 50, and 100 years. Calculated values of these risk parameters may vary by a factor of two or more from actual values due to the short earthquake history of the region studied, uncertainties in location and magnitude of past large earthquakes, lack of measured ground accelerations in the regions, and the unknown modifying influence of soil and subsoil materials.Seismic risk may be significant for parts of the Mackenzie Valley pipeline corridor in the vicinity of Fort McPherson between mile 700 (east of Arctic Red River, Northwest Territories) and mile 850 (east of Old Crow, Yukon Territory).

AUTOMATIC CONTOURING USING BICUBIC FUNCTIONS

Geophysics ◽  
1972 ◽  
Vol 37 (4) ◽  
pp. 669-674 ◽  
Author(s):  
R. C. Hessing ◽  
Henry K. Lee ◽  
Alan Pierce ◽  
Eldon N. Powers
Keyword(s):  
Spatial Distribution ◽  
Cross Sections ◽  
Digital Computer ◽  
Smooth Surface ◽  
Contour Line ◽  
Contour Maps ◽  
Volume Calculations ◽  
Contour Lines ◽  
Data Points ◽  
Automatic Contouring

A method is described for using a digital computer to construct contour maps automatically. Contour lines produced by this method have correct relations to given discrete data points regardless of the spatial distribution of these points. The computer‐generated maps are comparable to those drawn manually. The region to be contoured is divided into quadrilaterals whose vertices include the data points. After supplying values at each of the remaining vertices by using a surface‐fitting technique, bicubic functions are constructed on each quadrilateral to form a smooth surface through the data points. Points on a contour line are obtained from these surfaces by solving the resulting cubic equations. The bicubic functions may be used for other calculations consistent with the contour maps, such as interpolation of equally spaced values, calculation of cross‐sections, and volume calculations.

scholarly journals Provincial Land Use Planning Initiatives in the Town of Kapuskasing

2013 ◽  
Vol 10 (1) ◽  
pp. 1-15
Author(s):  
O. W. Saarinen
Keyword(s):  
Land Use ◽  
World War I ◽  
Land Use Planning ◽  
Urban Fringe ◽  
World War ◽  
History Of ◽  
Special Mention ◽  
The City ◽  
The Town

Kapuskasing, Ontario warrants special mention in the history of Canadian land use planning. The town first acquired special prominence immediately following World War I when it was the site of the first provincially-planned resource community in Canada. The early layout of the settlement reflected the imprints of both the "city beautiful" and "garden city" movements. After 1958, the resource community then became the focus for an important experiment in urban "fringe" rehabilitation at Brunetville, a suburban area situated just east of the planned Kapuskasing townsite. The author suggests that the role of the Brunetville experiment in helping to change the focus of urban renewal in Canada from redevelopment to rehabilitation has not been fully appreciated.

scholarly journals استخدام نظم المعلومات الجغ ا رفية في إنشاء نموذج ارتفاع رقمي للكثبان الرملية

2013 ◽  
Vol 1 (1) ◽  
pp. 14-21
Author(s):  
Hussein M. Al-Khuzaie ◽  
Qassim J. Salman
Keyword(s):  
Sand Dunes ◽  
Google Earth ◽  
Digital Information ◽  
Space Images ◽  
Contour Maps ◽  
Contour Lines ◽  
Digital Elevation ◽  
Gis Technique ◽  
City District ◽  
Elevation Model

"In GIS, it is essential to use the areal and space images as data references for information, but it is necessary to create digital information using software such as SURFER 8 and ARC view. These data can be furnished to create digital contour lines map in a rapid way rather than the conventional methods. In this paper, GIS technique was used for producing 3 dimension contour maps for earth surface. This was called as Digital Elevation Model that can provide a view for spatial coordination for the location of these maps. The area was selected for this study is the sand dunes area at Al.Mamlaha (Samawa city district). The source of space images was Google Earth ."

E-Planning Through the Wisconsin Land Information Program

2012 ◽  
Vol 1 (1) ◽  
pp. 75-89 ◽  
Author(s):  
Patrice Day ◽  
Rina Ghose
Keyword(s):  
Land Use Planning ◽  
Records Management ◽  
Budget Deficits ◽  
State Budget ◽  
Critical Gis ◽  
Grass Roots ◽  
Funding Mechanism ◽  
Information Program ◽  
History Of ◽  
Local Government Level

Through the lenses of Critical GIS and political economy, this paper examines the history of the Wisconsin Land Information Program (WLIP), which was created in 1989 and provides an early US example of the adoption of GIS at the local government level. Using a mixed methods approach and a case study design, the authors focus on the cooperation and conflicts among various actors and networks, at and between scales, during times of plentiful and lean resources. Catalyzed by the 1978 Larsen Report, the WLIP was unique in its inclusiveness of everyone involved in land records management. University academics brought together all the stakeholders to create a thematic and territorial network with political power and a unique funding mechanism. As land use planning and state budget deficits became prominent, the program became a target, leading to conflict and power struggles, particularly with the state Department of Administration (DOA). What began as an egalitarian, grass-roots, socially just, forward-thinking program has shape-shifted, and while the WLIP is still a viable and functioning program, its egalitarian goals have been subverted by economics.

Sign in / Sign up

Export Citation Format

Share Document