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| 1 | Mapping aboveground biomass and its prediction uncertainty using LiDAR and field data, accounting for tree-level allometric and LiDAR model errors显示文摘Background: The increasing availability of remotely sensed data has recently challenged the traditional way of performing forest inventories, and induced an interest in model-based inference. Like traditional design-based inference, model-based inference allows for regional estimates of totals and means, but in addition for wall-to-wall mapping of forest characteristics. Recently Light Detection and Ranging(LiDAR)-based maps of forest attributes have been developed in many countries and been well received by users due to their accurate spatial representation of forest resources. However, the correspondence between such mapping and model-based inference is seldom appreciated. In this study we applied hierarchical model-based inference to produce aboveground biomass maps as well as maps of the corresponding prediction uncertainties with the same spatial resolution. Further, an estimator of mean biomass at regional level, and its uncertainty, was developed to demonstrate how mapping and regional level assessment can be combined within the framework of model-based inference.Results: Through a new version of hierarchical model-based estimation, allowing models to be nonlinear, we accounted for uncertainties in both the individual tree-level biomass models and the models linking plot level biomass predictions with LiDAR metrics. In a 5005 km2 large study area in south-central Sweden the predicted aboveground biomass at the level of 18 m×18 m map units was found to range between 9 and 447 Mg·ha^-1. The corresponding root mean square errors ranged between 10 and 162 Mg·ha^-1. For the entire study region, the mean aboveground biomass was 55 Mg·ha^-1 and the corresponding relative root mean square error 8%. At this level 75%of the mean square error was due to the uncertainty associated with tree-level models.Conclusions: Through the proposed method it is possible to link mapping and estimation within the framework of model-based inference. Uncertainties in both tree-level biomass models and models linking plot level biomass with LiDAR data are accounted for, both for the uncertainty maps and the overall estimates. The development of hierarchical model-based inference to handle nonlinear models was an important prerequisite for the study. | Svetlana Saarela AndréWästlund Emma Holmström Alex Appiah Mensah Sören Holm Mats Nilsson Jonas Fridman Göran Ståhl | 2020 | Forest Ecosystems2020，7，3： | 3 |
| 2 | Comparison of estimators of variance for forest inventories with systematic sampling-results from artificial populations显示文摘Background:Large area forest inventories often use regular grids(with a single random start)of sample locations to ensure a uniform sampling intensity across the space of the surveyed populations.A design-unbiased estimator of variance does not exist for this design.Oftentimes,a quasi-default estimator applicable to simple random sampling(SRS)is used,even if it carries with it the likely risk of overestimating the variance by a practically important margin.To better exploit the precision of systematic sampling we assess the performance of five estimators of variance,including the quasi default.In this study,simulated systematic sampling was applied to artificial populations with contrasting covariance structures and with or without linear trends.We compared the results obtained with the SRS,Matern’s,successive difference replication,Ripley’s,and D’Orazio’s variance estimators.Results:The variances obtained with the four alternatives to the SRS estimator of variance were strongly correlated,and in all study settings consistently closer to the target design variance than the estimator for SRS.The latter always produced the greatest overestimation.In populations with a near zero spatial autocorrelation,all estimators,performed equally,and delivered estimates close to the actual design variance.Conclusion:Without a linear trend,the SDR and DOR estimators were best with variance estimates more narrowly distributed around the benchmark;yet in terms of the least average absolute deviation,Matern’s estimator held a narrow lead.With a strong or moderate linear trend,Matern’s estimator is choice.In large populations,and a low sampling intensity,the performance of the investigated estimators becomes more similar. | Steen Magnussen Ronald EMcRoberts Johannes Breidenbach Thomas Nord-Larsen Göran Ståhl Lutz Fehrmann Sebastian Schnell | 2020 | Forest Ecosystems2020，7，2： | 2 |
| 3 | Preservation of mitochondrial function with cardiopulmonary resuscitation in prolonged cardiac arrest in rats显示文摘 | Yeh ST Lee HL Aune SE | 2009 | J Mol Cell Cardiol2009，47，6： | 1 |
| 4 | Is fusion necessary for surgical-ly treated burst factures of the thoraco lumber and lumbar spine?Aprospective randomized study显示文摘 | WANG ST MA HL LIU CL | 2006 | Spine2006，31，23： | 1 |
| 5 | Epidemiologic features of hand-foot-mouth disease and herpangina caused by enterovirus 71 in Taiwan,1998-2005显示文摘 | CHEN KT CHANG HL WANG ST | | 0，，02： | 1 |
| 6 | Topical haemostatics in renal trauma anevaluation of four different substances in an experimental setting显示文摘 | Bjorses K Hl st J | | 0，，03： | 1 |
| 7 | Attenuation of muscle atrophy in a murine model of cachexia by inhibition of the dsRNA-dependent protein kinase显示文摘 | Eley HL Russell ST Tisdale MJ | 2007 | Br J Cancer2007，96，8： | 1 |
| 8 | Epidemiologic features of hand-foot-mouth disease and herpangina caused by enterovirus 71 in Taiwan,1998-2005显示文摘 | Chen KT Chang HL Wang ST | 2007 | Pediatrics2007，120，2： | 1 |
| 9 | Epidemiologic features of hand-foot-mouth disease and herpangina caused by en/erovirus 71 in Taiwan, 1998-2005显示文摘 | Chen KT Chang HL Wang ST | 2007 | Pediatrics2007，120，2： | 1 |
| 10 | Amniotic fluid stem cells from EGFP transgenic mice attenuate hyperoxia-indnced acute lung injury显示文摘 | Wen ST Chen W Chen HL | 2013 | PLoS One2013，8，75： | 1 |
| 11 | Is fusion necessary for surgically treated burst fractures of the thoracolnmbar and lumbar spine?A prospective, randomized study显示文摘 | Wang ST Ma HL Lu CL | 2006 | Spine2006，31，： | 1 |
| 12 | Epidemiologie features of hand-foot-mouth disease and herpangina caused by enterovirus 71 in Taiwan,1998 - 2005显示文摘 | Chen KT Chang HL Wang ST | 2007 | Pediatrics2007，120，2： | 1 |
| 13 | Lamivudine treatment for fulminant hepatic failure due to acute exacerbation of chronic hepatitis B infection显示文摘 | Tsang SW Chan HL Leung NW Chau TN Lai ST Chan FK Sung JJ | 2001 | Aliment Pharmacol Ther2001，15，11： | 1 |
| 14 | Novel initializa- tion scheme for Fuzzy C-Means algorithm on color image seg- mentation显示文摘 | KHANG ST WEI HL NORASHIDI MI | 2013 | Applied Soft Computing2013，13，： | 1 |
| 15 | An economical biorefinery process for propionic acid production from glycerol and potato juice using high cell density fermenta- tion 显示文摘 | Dishisha T St hl Lundmark S | 2013 | Bioresource Technology2013，135，： | 1 |
| 16 | A lethal pulmonary embolism during percutaneous vertebroplasty显示文摘 | Chen HL Wong CS Ho ST | 2002 | Anesth Analg2002，95，4： | 1 |
| 17 | Cardiovascular disease risk factors and DNA methylation at the Line - 1 repeat region in pe- ripheral blood from Samoan Islanders显示文摘 | Cash HL McGarvey ST Houseman EA | 2011 | Epigenetics :official journal of the DNA methylation society2011，6，10： | 1 |
| 18 | Epidemiologic features of hand-foot-mouth disease and herpangina caused by enterovirus 71 in Taiwan,1998-2005 显示文摘 | Chen KT Chang HL Wang ST | 2007 | Pediatrics2007，120，2： | 1 |
| 19 | Epidemiologic features ofhand-foot-mouth disease and herpangina caused by enterovirus 71in Taiwan,1998-2005显示文摘 | Chen KT Chang HL Wang ST | 2007 | Pediatrics2007，120，2： | 1 |
| 20 | Preservation of mitochondrialfunction with cardiopulmonary resuscitation in prolonged cardiacarrest in rats 显示文摘 | Yeh ST Lee HL Aune SE | 2009 | J Mol Cell Cardiol2009，47，6： | 1 |
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