Large-scale aerial photo comparison for detecting pine dieback

Spencer, R. D.

doi:10.1080/00049158.1985.10674430

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Earliest applications of remote sensing for forest water stress management appeared in the middle of the 1980s. These included studies by Korner [126] who used a thermal scanner to detect water stress symptoms in leaves, and Spencer [127] who applied large-scale 70 mm colour and black-and-white aerial photography to detect dieback in drought-stressed radiata pine. Spencer [127] emphasised the superior performance of colour photos as compared to black-and-white and field survey data.…”

Section: Change In Applications Over Timementioning

confidence: 99%

“…These included studies by Korner [126] who used a thermal scanner to detect water stress symptoms in leaves, and Spencer [127] who applied largescale 70 mm colour and black-and-white aerial photography to detect dieback in droughtstressed radiata pine. Spencer [127] emphasised the superior performance of colour photos as compared to black-and-white and field survey data. The use of satellite remote sensing to monitor forest-water interactions in water-limited sites was mentioned in the study by Running and Nemani [128], in which correlations between NDVI calculated from the Advanced Very High Resolution Radiometer (AVHRR) sensor and both photosynthesis (PSN) and transpiration (TRN) were examined.…”

Section: Change In Applications Over Timementioning

confidence: 99%

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Application of Remote Sensing in Detecting and Monitoring Water Stress in Forests

Harper

Dell

2023

Remote Sensing

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In the context of climate change, the occurrence of water stress in forest ecosystems, which are solely dependent on precipitation, has exhibited a rising trend, even among species that are typically regarded as drought-tolerant. Remote sensing techniques offer an efficient, comprehensive, and timely approach for monitoring forests at local and regional scales. These techniques also enable the development of diverse indicators of plant water status, which can play a critical role in evaluating forest water stress. This review aims to provide an overview of remote sensing applications for monitoring water stress in forests and reveal the potential of remote sensing and geographic information system applications in monitoring water stress for effective forest resource management. It examines the principles and significance of utilizing remote sensing technologies to detect forest stress caused by water deficit. In addition, by a quantitative assessment of remote sensing applications of studies in refereed publications, the review highlights the overall trends and the value of the widely used approach of utilizing visible and near-infrared reflectance data from satellite imagery, in conjunction with classical vegetation indices. Promising areas for future research include the utilization of more adaptable platforms and higher-resolution spectral data, the development of novel remote sensing indices with enhanced sensitivity to forest water stress, and the implementation of modelling techniques for early detection and prediction of stress.

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Section: Change In Applications Over Timementioning

confidence: 99%

Section: Change In Applications Over Timementioning

confidence: 99%

Application of Remote Sensing in Detecting and Monitoring Water Stress in Forests

Harper

Dell

2023

Remote Sensing

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“…Similarly, the interpretation of vigour in drought-stressed radiata pine from large-scale 70 mm aerial photographs was enhanced through the use of colour (Spencer and Howard 1971). In fact, detailed analysis of omission and commission errors for the interpretation of crown categories, defined by present condition and potential for recovery on large-scale (I: I 000) aerial photographs, showed that the colour photographs were superior to ground observations for detecting dead and dying foliage in upper crowns (Spencer 1985).…”

Section: Evaluating New Films and Photographic Variablesmentioning

confidence: 99%

Small format aerial photography: methods and achievements in Australian forestry

Spencer

1998

Australian Forestry

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Since the mid 1960s Australian forestry has benefited from small format aerial photography (SFAP) for testing new films, scales and photographic conditions; for supplementing major aerial surveys by monitoring changes on small-scale images and using this information to intensify maps, such as plantings and roads in new plantations; for achieving special effects, such as shadowless large-scale coverage to detect understorey details (e.g. disease symptoms) and for double sampling at large scales in conjunction with Global Positioning System (GPS) navigation and Geographic Information Systems (GIS) analysis to obtain quantitative data for a flexible, responsive information system. Results from early photographic and mapping trials were quickly incorporated into operational procedures which are now widely applied. Likewise, a major program utilising the special effects of large scale shadow less SFAP for disease detection has been operational for many years. However, double sampling for volume inventories has only recently been applied, in spite of trials in the 1960s. The paper outlines requirements in each of these categories and uses examples from operational programs to illustrate their application.

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“…Ακόμη, η χρησιμότητα συστημάτων αεροφωτογράφησης των 70 mm που επιτρέπει τη διαχρονική λήψη μεγάλης κλίμακας διαφανειών με μικρό κόστος, παρουσιάζει ιδιαίτερο ενδιαφέρον για τους λιβαδοπόνους (Carneggie and (. Reppert 1969, Driscoll 1971, Tueller 1977, Meyer 1982, Spencer 1985, Befort 1988, Resors Research Results 1989, Καρτέρης 1990, Everitt και άλλοι 1990.…”

Section: αεροφωτογραφίες Radar και δορυφορικές εικόνεςunclassified

Κατανομη Της Φυτοκαλυψης Και Διαθεσιμης Παραγωγης Σε Θαμνολιβαδα Πουρναριου Καιεκτιμηση Τους Με Τη Βοηθεια Αεροφωτογραφιων

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Σχήμα 2-1. Σχηματική παράσταση της βοσκήσιμης ύλης στα λιβαδικά οικο συστήματα των ποολίβαδων και θαμνολίβαδων.Τη διαθέσιμη λιβαδική παραγωγή για την οποία στο εξής θα χρησιμο ποιείται ο όρος διαθέσιμη παραγωγή, στην παρούσα έρευνα αποτελούν, η ετήσια λιβαδική παραγωγή της ποώδους βλάστησης και η λιβαδική παρα γωγή των θάμνων μέχρι ύψους 1,5μ., βάθους 30 εκατ. στην παράπλευρη επιφάνεια της κόμης ή 10 εκατ. στο οριζόντιο τμήμα της. Η θαμνώδης πα ραγωγή περιλαμβάνει τη διαθέσιμη βοσκήσιμη ύλη, που είναι μέ ρος της ετήσιας βοσκήσιμης ύλης και ένα τμήμα της θαμνώδους βλάστησης παρελθόντων ετών. Μέθοδοι μέτρησης της παραγωγής θαμνολίβαδωνΟι χρησιμοποιούμενες μέθοδοι για τον προσδιορισμό της ολικής ή δια θέσιμης παραγωγής θαμνολίβαδων στηρίζονται σε άμεσες ή έμμεσες μετρή σεις (Cook and Stubbendieck 1986, Etienne 1989)• 2.2.1. Άμεσοι μέθοδοι 2.2.1.1. Μέθοδος συγκομιδής Η μέθοδος αυτή συνίσταται στην κοπή της υπέργειας παραγωγής των θάμνων και την ξήρανση της στον αέρα ή σε πυριατήριο, προκειμένου να προσδιοριστεί το ξηρό της βάρος. Είναι γνωστή ως μέθοδος συγκομιδής (Harvest method) (Odum 1983). Θα πρέπει να τονιστεί ότι η μέθοδος

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Large-scale aerial photo comparison for detecting pine dieback

Cited by 3 publications

References 6 publications

Application of Remote Sensing in Detecting and Monitoring Water Stress in Forests

Application of Remote Sensing in Detecting and Monitoring Water Stress in Forests

Small format aerial photography: methods and achievements in Australian forestry

Κατανομη Της Φυτοκαλυψης Και Διαθεσιμης Παραγωγης Σε Θαμνολιβαδα Πουρναριου Καιεκτιμηση Τους Με Τη Βοηθεια Αεροφωτογραφιων

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