ASSESSING the ACCURACY of REMOTELY SENSED DATA - CHAPTER 8 (end) ppt

... assess the accuracy of both the new map and the photo-based map. This chapter concentrates on the methods, assump- tions, and results of the accuracy assessment portions of the project. The sample design, ... 20). Table 8- 7 illustrates how the variances were implemented across all crown closure classes. Table 8- 8 illustrates the implementation of the ran...

Ngày tải lên: 11/08/2014, 06:22

... as the infrared portions of the electromagnetic spectrum. The accuracy of maps made from remotely sensed data is measured by two types of criteria: location accuracy and classification or thematic ... imprint of CRC Press No claim to original U.S. Government works International Standard Book Number 0 -8 737 1-9 8 6-7 Library of Congress Card Number 9 8- 2 96...

Ngày tải lên: 11/08/2014, 06:22

... labels or classified data generated from the remotely sensed data. Thus, two labels from each sample are compared to one another: • Reference data labels: the class label of the accuracy assessment ... “Reli- ability of Measured Values” held at the 18th Annual Meeting of the American Society of Photogrammetry, Mr. Amrom Katz (1952), the panel chair, made a very...

Ngày tải lên: 11/08/2014, 06:22

... requires trade-offs between the remotely sensed data used to create the map and the level of accuracy required by the project. We accept some level of error as a trade-off for the cost savings ... reference data should be collected as close as possible to the date of the collection of the remotely sensed data used to make the map. However, trade-offs...

Ngày tải lên: 11/08/2014, 06:22

... regard to the location of these areas. In other words, a comparison between the number of acres or hectares of each category on the map generated from remotely sensed data and the reference data is ... to the use of the Kappa coefficient for assessing the accuracy of remotely sensed classifications because the degree of chance agreement may be over-...

Ngày tải lên: 11/08/2014, 06:22

... from the one used to create the map—a common occurrence when existing data or maps are used as reference data. • Changes in land cover between the date of the remotely sensed data and the date of ... IN THE REFERENCE DATA A major assumption of the error matrix is that the label from the reference information represents the “true” label of the site and...

Ngày tải lên: 11/08/2014, 06:22

... map are not correlated), then probability tells us that the accuracy would be computed by mul- tiplying the accuracies of the layers together. Therefore, the accuracy of the final map is 90% × ... order to obtain the highest classifi- cation accuracy. Because all of the cells of the matrix are considered, the Kappa coefficient of agreement was the recommende...

Ngày tải lên: 11/08/2014, 06:22

... tanks are often used as separators, with outlets installed on the bottom of the tanks so that water that has settled to the bottom of the tank can be drained off, leaving the oil in the tank. ... of hydrocarbon fuels. Often the equipment at refineries cannot handle oils with debris, excessive amounts of water, or other contaminants and the cost of pre-treating the o...

Ngày tải lên: 11/08/2014, 04:20

... presentation of the population. The next important section of the results is the F-Change statistics. The F-ratio is a measure of how much a model has improved the prediction of the outcome compared to the ... purposes) The ACB group during the three phases of the trialFigure 10 The ACB group during the three phases of the trial. Comparison between the...

Ngày tải lên: 11/08/2014, 14:20

... of the biodiesel. The molar ratio is dened as the ratio of number of moles of alcohol to number of moles of triglycerides. Theoreti- cally, 3 mol of alcohol is required for the conversion of ... amount of the sulfuric acid lowers the yield. 20.2.1.1.2 Effect of the Amount of Methanol The quantity of the methanol used is an important factor that aff...

Ngày tải lên: 20/06/2014, 00:20