A Comparison of Urban Mapping Methods Using High-Resolution Digital Imagery

Abstract A set of Heavy Vacuum Gas Oil (HVGO) pumps in a 300 kbbl/day operating Upgrader Plant experienced repeated failures; typically less than 7 weeks. The pumps run continuously in a high-pressure, high temperature and corrosive environment and their functional status directly affects the reliability of the plant. Upon research, an experimental strain measurement technique using very high resolution laser digital imagery and optical metrology was found from military and advanced aerospace applications to verify high level dimensional accuracy of critical components [1]. Application to a complex and operating bitumen upgrader was unknown. The objective of this project was to use advanced optical metrology with digital image processing techniques employing multiple laser and high-speed cameras capable of generating pump and pipe component’s real time strain images, displacement and rate of change. Optical metrology can analyze the mechanical properties and behavior of many materials and in various test scenarios [2]. Hot and cold operating service, with variations in flow and temperature all dynamically affect the strain measurements. Three significant advantages of the optical method are: i. Avoids a host of problems of strain gauge application, wiring and setup. ii. The problems of temperature sensitivity and correction are overcome. [3] iii. Gathers much more extensive data than possible with traditional methods. The vibration characteristics of the pumps and related hardware were analyzed using high resolution laser and photogrammetric digital imagery and digital strain mapping analysis to determine the characteristics that would ensure the long-term reliable and safe operation of the HVGO pumps. The stress and deformation analysis were performed on the operating pumps in a variety of normal (1280 m3/hr.) and upset operating conditions including under partial and full load conditions. Dynamic and modal analysis of the pumps was developed and analyzed. The displacement and tensor fields of the hardware including the pumps, bases and piping were measured using high resolution laser cameras and analyzed. From the high-speed data gathering and loading analysis showed the deformation and stress affecting the pump and related hardware. The key variables undermining reliable performance were revealed and from the data the necessary remedial action was determined. The pumps have operated for over 30months to the time of writing without repeat failure. This paper should be read in conjunction with PVP 2020-21203; Investigation and Resolution of the Fluid Structure Interaction of High Rate HVGO Pumps.

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Mapping of Nypa Palm Invasion of Mangrove Forest Using Low-Cost and High Resolution UAV Digital Imagery in The Niger Delta, Nigeria

Current Trends in Forest Research ◽

10.29011/2638-0013.100031 ◽

2019 ◽

Vol 3 (01) ◽

Keyword(s):

High Resolution ◽

Niger Delta ◽

Mangrove Forest ◽

Low Cost ◽

Digital Imagery

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Directing Attention in Open Scenes

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/154193120204601717 ◽

2002 ◽

Vol 46 (17) ◽

pp. 1609-1612 ◽

Cited By ~ 2

Author(s):

Stephen Hughes ◽

Michael Lewis

Keyword(s):

High Resolution ◽

Aerial Photographs ◽

Wide Angle ◽

Digital Imagery ◽

Definable Set ◽

Degree Of Confidence ◽

Directing Attention

Attention direction is particularly difficult in open scenes such as detailed aerial photographs, wide angle/multiple video feeds, or high-resolution digital imagery. Unlike conventional displays that have single parameters with definable set points, open scenes lack easy criteria for directing attention. The present study investigates the effects of varying levels of highlighting for correctly and incorrectly designated targets. The results suggest that linking the intensity of highlighting to degree of confidence may be an effective display strategy to maximize efforts to draw attention to objects in an open scene.

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A multilevel decision fusion approach for urban mapping using very high-resolution multi/hyperspectral imagery

International Journal of Remote Sensing ◽

10.1080/01431161.2011.591444 ◽

2011 ◽

Vol 33 (11) ◽

pp. 3354-3372 ◽

Cited By ~ 17

Author(s):

Xin Huang ◽

Liangpei Zhang

Keyword(s):

High Resolution ◽

Hyperspectral Imagery ◽

Decision Fusion ◽

Urban Mapping ◽

Very High ◽

Fusion Approach

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Identifying High Value Arboreal Habitat in forested areas using high-resolution digital imagery

Pacific Conservation Biology ◽

10.1071/pc15031 ◽

2016 ◽

Vol 22 (4) ◽

pp. 367

Author(s):

Nigel Cotsell ◽

Mark Fisher ◽

David Scotts ◽

Mark Cameron

Keyword(s):

High Resolution ◽

Digital Imagery ◽

Landscape Matrix ◽

Conservation Assessment ◽

Old Growth Forest ◽

Mapping Process ◽

Forested Areas ◽

Natural Resource Managers ◽

Ecological Importance ◽

Arboreal Habitat

Old-growth forest is recognised as a high-value habitat in conservation assessment programs because of its importance to hollow-dependent species. Previous mapping undertaken at regional scales does not map patches of old forest smaller than 5 ha. While small patches of old forest may not be as ecologically important as large areas they provide opportunities for connectivity and specific habitat resources for arboreal wildlife within a broader landscape matrix. Previously, smaller patches of old forest have been overlooked because the tools have not been available to map at finer scales. This study incorporates a methodology using recent advances in technology, including aerial photography, to map old forest at a fine scale for the purposes of land-use assessment and planning. The term ‘High Value Arboreal Habitat’ is introduced to convey the ecological importance of hollow-bearing trees as part of a wider identification and mapping of high-value habitats across the landscape. The assessment was undertaken across the forested areas of the Coffs Harbour Local Government Area using high-resolution digital imagery. It is anticipated that the High Value Arboreal Habitat mapping process will be adopted by a range of stakeholders and natural resource managers to better manage and conserve these old forests across the landscape whatever their size.

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