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

Damen, M. C. J.

Bibliographic data

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:: 856343064

Title:: Remote sensing for resources development and environmental management

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

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

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

Editor:: Damen, M. C. J.

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:: 1 Visible and infrared data. Chairman: F. Quiel, Liaison: N J. Mulder

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Airphoto map control with Landsat - An alternative to the slotted templet method. W. D. Langeraar

Document type:: Multivolume work

Structure type:: Chapter

47 Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Airphoto map control with Landsat - An alternative to the slotted templet method W.D.Langeraar Euroconsult. Arnhem, Netherlands ABSTRACT: Negative results experienced with the slotted templet method using aerial photographs that are tilted and have varying scales, have prompted the development of a more suitable method to produce basemaps under field conditions. Using Landsat as cartographic control it has become possible to assemble airphotos into geographic basemaps with a mean accuracy of 1.5 mm on a photo scale of 1/20.000. This has been empirically determined in south-eastern Irian Jaya using tilted airphotos with varying scales. Comparable accuracy could have been obtained had slotted templets been assembled to a control density of one control point per 85 accurately flown airphotos. Advantages of this approach over the slotted templet method are: * Photo tilt and scale variations do not disturb map accuracy. * Field data collected along survey lines can always be located on airphotos and thus integrated in the interpretation. * No ground control required prior to flying. - Landsat control is always evenly distributed, and so * Map compilation is much less time consuming. In remote areas, the airphoto map control method using for the production of an adequately accurate basemap to 1 INTRODUCTION 1.1 Purpose The purpose of this article is not to provide the remote sensing community with another mathematically air-tight dissertation on certain geodetic considerations inherent to any new mapping technique. On the contrary, the purpose is to describe a useful cartographic application of Landsat imagery and discuss empirical accuracy tests. As is the case with many innovations, the approach discussed here was born out of a problem situation where a practical solution was called for. The new method was found to be cost effective and to save time, while providing satisfactory mapping results. For that reason, I feel that the airphoto map control method using Landsat could be a useful and beneficial technique for the mapping of remote areas. 1.2 Background During the last five years Euroconsult (a Dutch firm mainly active in agricultural consultancy) has built up considerable experience in integrated rural development planning in the south-eastern part of Irian Jaya, Indonesia. Euroconsult has surveyed almost half a million hectares there, and compiled the thematic data into maps with a scale of 1/20 000. Prior to the study, the Indonesian Government made available to Euroconsult blocks of unrectified aerial photographs not only as a source of thematic information, but also as a basis for mapping. The old Dutch maps of the region (scale 1/100 000) are reasonably accurate only as far as the location of major rivers is concerned. Geographic information on the interfluvial areas is completely lacking on these maps, which impedes their use as a mapping base. Other existing maps are also unsuitable for similar reasons. As a result, Euroconsult was is map accuracy. Landsat is thus found to be the best possible option be used for supporting thematic mapping data. obliged to produce its own basemaps. Until recently the best option open to the consultant to achieve this, was to assemble the airphotos into a mosaic with the help of the slotted templet method and then update the accuracy with the aid of traverse measurements. 2 PROBLEM 2.1 Orientation on airphotos Mapping which includes fieldwork in areas like southern Irian Jaya is, at best, a cumbersome exercise. Fieldwork areas are very difficult to reach due to lack of infrastructure. The environment is hostile for a variety of reasons such as climate, flora and fauna. A more serious mapping constraint follows from the fact that aerial photography is flown invariably before a start is made with fieldwork. As a result, locations of observations in the field cannot be readily identified on the airphotos. If the consultant cannot correlate his field data with the airphoto at all, then his airphoto interpretation is reduced to guesswork and the purity of his mapping units will suffer proportionally. Also, the accuracy of the basemap cannot be improved anymore. A primary requisite for integrated rural development studies is a detailed physiographic land-unit map covering the study area, compiled from airphoto interpration supported with field observations. The individual mapping units should be as pure and homogeneous as possible in order to serve as ’building-blocks’ for subsequent maps on soils, forest resources, land clearing plans, road alignments, village structure plans, etc. It is, therefore imperative that field observations can always be exactly located on the aerial photographs. To make this possible the airphotos must be assembled into a planimetrically correct photo-basemap on. which field observation

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