Pub Date : 1989-06-01DOI: 10.1016/0031-8663(89)90002-1
J. Ton, A.K. Jain, W.R. Enslin, W.D. Hudson
A conceptually parallel road detection method in Landsat 4 TM images is proposed. The goal is to detect roads at three different levels: major roads, local roads, and minor roads. This road network information is used for the evaluation of detected potential oil/gas pads, since these pads seldom occur on major roads but are often located at the end of minor access roads.
The proposed method is composed of two phases: low-level road detection and high-level road labeling. Experimental results from several images show that the proposed method can detect roads reasonably well in the low-level phase and is useful in pad evaluation. Future research includes combining multi-band information in road detection and determining thresholds in a more systematic way.
{"title":"Automatic road identification and labeling in Landsat 4 TM images","authors":"J. Ton, A.K. Jain, W.R. Enslin, W.D. Hudson","doi":"10.1016/0031-8663(89)90002-1","DOIUrl":"10.1016/0031-8663(89)90002-1","url":null,"abstract":"<div><p>A conceptually parallel road detection method in Landsat 4 TM images is proposed. The goal is to detect roads at three different levels: major roads, local roads, and minor roads. This road network information is used for the evaluation of detected potential oil/gas pads, since these pads seldom occur on major roads but are often located at the end of minor access roads.</p><p>The proposed method is composed of two phases: low-level road detection and high-level road labeling. Experimental results from several images show that the proposed method can detect roads reasonably well in the low-level phase and is useful in pad evaluation. Future research includes combining multi-band information in road detection and determining thresholds in a more systematic way.</p></div>","PeriodicalId":101020,"journal":{"name":"Photogrammetria","volume":"43 5","pages":"Pages 257-276"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8663(89)90002-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84623757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-06-01DOI: 10.1016/0031-8663(89)90001-X
F. Baret , G. Guyot , D.J. Major
Crop biomass can be evaluated from radiometric measurements either by relating biomass to instantaneous measurements or by relating an integral of biomass to a radiometric value integrated over the corresponding portion of the growth period.
In this study, the success obtained by using these two methods is discussed. A simple radiative transfer model was used in conjunction with experimental results to demonstrate the universality of the relationship between the normalized difference vegetation index (ND) and leaf area index (LAI) or the photosynthetically active radiation (PAR) absorbed by the crop. It shows that the relationship between ND and absorbed PAR is less dependent on leaf orientation than the relationship between ND and LAI. A remaining problem is the sensitivity of those two relationships to soil optical properties. Nevertheless, temporal integration of radiometric data using the absorbed PAR concept appears to be a more promising approach than one-time measurements.
{"title":"Crop biomass evaluation using radiometric measurements","authors":"F. Baret , G. Guyot , D.J. Major","doi":"10.1016/0031-8663(89)90001-X","DOIUrl":"10.1016/0031-8663(89)90001-X","url":null,"abstract":"<div><p>Crop biomass can be evaluated from radiometric measurements either by relating biomass to instantaneous measurements or by relating an integral of biomass to a radiometric value integrated over the corresponding portion of the growth period.</p><p>In this study, the success obtained by using these two methods is discussed. A simple radiative transfer model was used in conjunction with experimental results to demonstrate the universality of the relationship between the normalized difference vegetation index (<em>ND</em>) and leaf area index (<em>LAI</em>) or the photosynthetically active radiation (<em>PAR</em>) absorbed by the crop. It shows that the relationship between <em>ND</em> and absorbed <em>PAR</em> is less dependent on leaf orientation than the relationship between <em>ND</em> and <em>LAI</em>. A remaining problem is the sensitivity of those two relationships to soil optical properties. Nevertheless, temporal integration of radiometric data using the absorbed PAR concept appears to be a more promising approach than one-time measurements.</p></div>","PeriodicalId":101020,"journal":{"name":"Photogrammetria","volume":"43 5","pages":"Pages 241-256"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8663(89)90001-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81259543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-03-01DOI: 10.1016/0031-8663(89)90012-4
Vassilis G. Mertzios , Giovanni L. Sicuranza , Anastasios N. Venetsanopoulos
Matrix decomposition techniques are used in order to obtain efficient structures for 2-D quadratic digital filters. The proposed structures consist of parallel branches which operate simultaneously on the input array. Each branch is formed by a 2-D FIR filter in cascade with a squaring operator, and all the partial results are summed up to obtain the output value. In the paper it is shown that, in particular, the lower-upper (LU) decomposition permits computational and hardware advantages.
{"title":"Efficient structures for two-dimensional quadratic filters","authors":"Vassilis G. Mertzios , Giovanni L. Sicuranza , Anastasios N. Venetsanopoulos","doi":"10.1016/0031-8663(89)90012-4","DOIUrl":"10.1016/0031-8663(89)90012-4","url":null,"abstract":"<div><p>Matrix decomposition techniques are used in order to obtain efficient structures for 2-D quadratic digital filters. The proposed structures consist of parallel branches which operate simultaneously on the input array. Each branch is formed by a 2-D FIR filter in cascade with a squaring operator, and all the partial results are summed up to obtain the output value. In the paper it is shown that, in particular, the lower-upper (LU) decomposition permits computational and hardware advantages.</p></div>","PeriodicalId":101020,"journal":{"name":"Photogrammetria","volume":"43 3","pages":"Pages 157-166"},"PeriodicalIF":0.0,"publicationDate":"1989-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8663(89)90012-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76057766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-03-01DOI: 10.1016/0031-8663(89)90021-5
Ron Graham
{"title":"Seminar on small format (SF) aerial surveys and their applications","authors":"Ron Graham","doi":"10.1016/0031-8663(89)90021-5","DOIUrl":"https://doi.org/10.1016/0031-8663(89)90021-5","url":null,"abstract":"","PeriodicalId":101020,"journal":{"name":"Photogrammetria","volume":"43 3","pages":"Pages 222-228"},"PeriodicalIF":0.0,"publicationDate":"1989-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8663(89)90021-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91981654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-03-01DOI: 10.1016/0031-8663(89)90009-4
Sandor A. Veress
The economy of X-ray photogrammetry systems is analyzed first as a geometrical economy where a maximum accuracy should be achieved with a minimum radiation through proper geometry. Experiments for the various geometry are discussed and illustrated. Second, the system is analyzed for data processing. Possible automation and computer programs are discussed. A desirable data flow is presented with proper hardware configuration.
{"title":"Different considerations in analytical X-ray photogrammetry","authors":"Sandor A. Veress","doi":"10.1016/0031-8663(89)90009-4","DOIUrl":"10.1016/0031-8663(89)90009-4","url":null,"abstract":"<div><p>The economy of X-ray photogrammetry systems is analyzed first as a geometrical economy where a maximum accuracy should be achieved with a minimum radiation through proper geometry. Experiments for the various geometry are discussed and illustrated. Second, the system is analyzed for data processing. Possible automation and computer programs are discussed. A desirable data flow is presented with proper hardware configuration.</p></div>","PeriodicalId":101020,"journal":{"name":"Photogrammetria","volume":"43 3","pages":"Pages 123-132"},"PeriodicalIF":0.0,"publicationDate":"1989-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0031-8663(89)90009-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88127036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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